import Foundation
import AppKit
import ApplicationServices
#if PI_COMPUTER_USE_SCREEN_CAPTURE_KIT
import ScreenCaptureKit
#endif

struct BridgeFailure: Error {
	let message: String
	let code: String
}

final class AXRefStore {
	private var nextId: UInt64 = 0
	private var windows: [String: AXUIElement] = [:]
	private var elements: [String: AXUIElement] = [:]

	func storeWindow(_ window: AXUIElement) -> String {
		nextId += 1
		let ref = "w\(nextId)"
		windows[ref] = window
		return ref
	}

	func storeElement(_ element: AXUIElement) -> String {
		nextId += 1
		let ref = "e\(nextId)"
		elements[ref] = element
		return ref
	}

	func window(for ref: String) -> AXUIElement? {
		windows[ref]
	}

	func element(for ref: String) -> AXUIElement? {
		elements[ref]
	}
}

private struct CGWindowCandidate {
	let windowId: UInt32
	let title: String
	let bounds: CGRect
	let isOnscreen: Bool
}

final class Box<T> {
	var value: T
	init(_ value: T) {
		self.value = value
	}
}

final class InputSuppressionGuard {
	private let lock = NSLock()
	private var eventTap: CFMachPort?
	private var eventTapSource: CFRunLoopSource?
	private var tapRunLoop: CFRunLoop?
	private var tapThread: Thread?

	func begin() throws {
		lock.lock()
		if eventTap != nil {
			lock.unlock()
			return
		}
		lock.unlock()

		let eventTypes: [CGEventType] = [
			.keyDown,
			.keyUp,
			.flagsChanged,
			.leftMouseDown,
			.leftMouseUp,
			.rightMouseDown,
			.rightMouseUp,
			.otherMouseDown,
			.otherMouseUp,
			.mouseMoved,
			.leftMouseDragged,
			.rightMouseDragged,
			.otherMouseDragged,
			.scrollWheel,
			.tabletPointer,
			.tabletProximity,
		]
		let mask = eventTypes.reduce(CGEventMask(0)) { partial, type in
			partial | (CGEventMask(1) << CGEventMask(type.rawValue))
		}

		let callback: CGEventTapCallBack = { _proxy, type, event, userInfo in
			guard let userInfo else { return Unmanaged.passUnretained(event) }
			let inputGuard = Unmanaged<InputSuppressionGuard>.fromOpaque(userInfo).takeUnretainedValue()
			if type == .tapDisabledByTimeout || type == .tapDisabledByUserInput {
				inputGuard.reenableTap()
				return Unmanaged.passUnretained(event)
			}
			return nil
		}

		guard let tap = CGEvent.tapCreate(
			tap: .cgSessionEventTap,
			place: .headInsertEventTap,
			options: .defaultTap,
			eventsOfInterest: mask,
			callback: callback,
			userInfo: UnsafeMutableRawPointer(Unmanaged.passUnretained(self).toOpaque())
		) else {
			throw BridgeFailure(message: "Failed to create input suppression event tap", code: "input_suppression_unavailable")
		}

		lock.lock()
		eventTap = tap
		lock.unlock()
		let thread = Thread { [weak self] in
			guard let self else { return }
			let runLoop = CFRunLoopGetCurrent()
			self.lock.lock()
			self.tapRunLoop = runLoop
			self.eventTapSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, tap, 0)
			if let source = self.eventTapSource {
				CFRunLoopAddSource(runLoop, source, .commonModes)
			}
			CGEvent.tapEnable(tap: tap, enable: true)
			self.lock.unlock()
			CFRunLoopRun()
		}
		thread.name = "pi-computer-use-input-suppression"
		lock.lock()
		tapThread = thread
		lock.unlock()
		thread.start()

		let deadline = Date().addingTimeInterval(1.0)
		while tapRunLoop == nil && Date() < deadline {
			Thread.sleep(forTimeInterval: 0.01)
		}
		if tapRunLoop == nil {
			throw BridgeFailure(message: "Timed out starting input suppression", code: "input_suppression_timeout")
		}
	}

	func end() {
		lock.lock()
		let tap = eventTap
		let source = eventTapSource
		let runLoop = tapRunLoop
		eventTap = nil
		eventTapSource = nil
		tapRunLoop = nil
		tapThread = nil
		lock.unlock()

		if let tap {
			CGEvent.tapEnable(tap: tap, enable: false)
		}
		if let source, let runLoop {
			CFRunLoopRemoveSource(runLoop, source, .commonModes)
			CFRunLoopStop(runLoop)
		}
	}

	func reenableTap() {
		lock.lock()
		let tap = eventTap
		lock.unlock()
		if let tap {
			CGEvent.tapEnable(tap: tap, enable: true)
		}
	}

}

final class Bridge {
	private let refStore = AXRefStore()
	private let inputSuppressionGuard = InputSuppressionGuard()
	private var stdinBuffer = Data()

	func run() {
		while true {
			autoreleasepool {
				let data = FileHandle.standardInput.availableData
				if data.isEmpty {
					exit(0)
				}
				stdinBuffer.append(data)
				processBufferedInput()
			}
		}
	}

	private func processBufferedInput() {
		let newline = Data([0x0A])
		while let range = stdinBuffer.range(of: newline) {
			let lineData = stdinBuffer.subdata(in: 0..<range.lowerBound)
			stdinBuffer.removeSubrange(0..<range.upperBound)

			guard !lineData.isEmpty else { continue }
			guard let line = String(data: lineData, encoding: .utf8) else { continue }
			handleLine(line)
		}
	}

	private func handleLine(_ line: String) {
		let trimmed = line.trimmingCharacters(in: .whitespacesAndNewlines)
		guard !trimmed.isEmpty else { return }

		let fallbackId = "invalid"
		do {
			guard let jsonData = trimmed.data(using: .utf8) else {
				throw BridgeFailure(message: "Input was not valid UTF-8", code: "invalid_request")
			}
			guard let object = try JSONSerialization.jsonObject(with: jsonData) as? [String: Any] else {
				throw BridgeFailure(message: "Request must be a JSON object", code: "invalid_request")
			}
			let id = (object["id"] as? String) ?? fallbackId

			do {
				let result = try handleRequest(object)
				send([
					"id": id,
					"ok": true,
					"result": result,
				])
			} catch let failure as BridgeFailure {
				send([
					"id": id,
					"ok": false,
					"error": [
						"message": failure.message,
						"code": failure.code,
					],
				])
			} catch {
				send([
					"id": id,
					"ok": false,
					"error": [
						"message": error.localizedDescription,
						"code": "internal_error",
					],
				])
			}
		} catch let failure as BridgeFailure {
			send([
				"id": fallbackId,
				"ok": false,
				"error": [
					"message": failure.message,
					"code": failure.code,
				],
			])
		} catch {
			send([
				"id": fallbackId,
				"ok": false,
				"error": [
					"message": error.localizedDescription,
					"code": "internal_error",
				],
			])
		}
	}

	private func send(_ payload: [String: Any]) {
		guard JSONSerialization.isValidJSONObject(payload),
			let data = try? JSONSerialization.data(withJSONObject: payload),
			let line = String(data: data, encoding: .utf8)
		else {
			return
		}

		if let out = (line + "\n").data(using: .utf8) {
			FileHandle.standardOutput.write(out)
		}
	}

	private func handleRequest(_ request: [String: Any]) throws -> Any {
		let cmd = try stringArg(request, "cmd")

		switch cmd {
		case "checkPermissions":
			return checkPermissions()
		case "openPermissionPane":
			return try openPermissionPane(request)
		case "listApps":
			return listApps()
		case "listWindows":
			return try listWindows(pid: Int32(try intArg(request, "pid")))
		case "getFrontmost":
			return try getFrontmost()
		case "getUserContext":
			return try getUserContext()
		case "beginInputSuppression":
			return try beginInputSuppression()
		case "endInputSuppression":
			return endInputSuppression()
		case "restoreUserFocus":
			return try restoreUserFocus(request)
		case "focusWindow":
			return try focusWindow(request)
		case "setWindowFrame":
			return try setWindowFrame(request)
		case "screenshot":
			return try screenshot(request)
		case "mouseClick":
			return try mouseClick(request)
		case "mouseMove":
			return try mouseMove(request)
		case "mouseDrag":
			return try mouseDrag(request)
		case "scrollWheel":
			return try scrollWheel(request)
		case "keyPress":
			return try keyPress(request)
		case "axPressAtPoint":
			return try axPressAtPoint(request)
		case "axFindTextInput":
			return try axFindTextInput(request)
		case "axFocusTextInput":
			return try axFocusTextInput(request)
		case "axListTargets":
			return try axListTargets(request)
		case "axPressElement":
			return try axPressElement(request)
		case "axPerformActionElement":
			return try axPerformActionElement(request)
		case "axFocusElement":
			return try axFocusElement(request)
		case "axFocusAtPoint":
			return try axFocusAtPoint(request)
		case "axScrollElement":
			return try axScrollElement(request)
		case "axScrollAtPoint":
			return try axScrollAtPoint(request)
		case "focusedElement":
			return try focusedElement(request)
		case "setValue":
			return try setValue(request)
		case "typeText":
			return try typeText(request)
		case "getMousePosition":
			return getMousePosition()
		default:
			throw BridgeFailure(message: "Unknown command '\(cmd)'", code: "unknown_command")
		}
	}

	private func stringArg(_ request: [String: Any], _ key: String) throws -> String {
		if let value = request[key] as? String {
			return value
		}
		throw BridgeFailure(message: "Missing string argument '\(key)'", code: "invalid_args")
	}

	private func optionalStringArg(_ request: [String: Any], _ key: String) -> String? {
		if let value = request[key] as? String {
			return value
		}
		return nil
	}

	private func intArg(_ request: [String: Any], _ key: String) throws -> Int {
		if let value = request[key] as? Int {
			return value
		}
		if let value = request[key] as? NSNumber {
			return value.intValue
		}
		if let value = request[key] as? Double {
			return Int(value)
		}
		throw BridgeFailure(message: "Missing integer argument '\(key)'", code: "invalid_args")
	}

	private func optionalIntArg(_ request: [String: Any], _ key: String) -> Int? {
		if let value = request[key] as? Int {
			return value
		}
		if let value = request[key] as? NSNumber {
			return value.intValue
		}
		if let value = request[key] as? Double {
			return Int(value)
		}
		return nil
	}

	private func doubleArg(_ request: [String: Any], _ key: String) throws -> Double {
		if let value = request[key] as? Double {
			return value
		}
		if let value = request[key] as? NSNumber {
			return value.doubleValue
		}
		if let value = request[key] as? Int {
			return Double(value)
		}
		throw BridgeFailure(message: "Missing numeric argument '\(key)'", code: "invalid_args")
	}

	private func checkPermissions() -> [String: Any] {
		let accessibility = AXIsProcessTrusted()
		let screenRecording: Bool
		if #available(macOS 10.15, *) {
			screenRecording = CGPreflightScreenCaptureAccess()
		} else {
			screenRecording = true
		}
		return [
			"accessibility": accessibility,
			"screenRecording": screenRecording,
		]
	}

	private func openPermissionPane(_ request: [String: Any]) throws -> [String: Any] {
		let kind = try stringArg(request, "kind")
		let urlString: String
		var requested = false
		switch kind {
		case "accessibility":
			let options = [kAXTrustedCheckOptionPrompt.takeUnretainedValue() as String: true] as CFDictionary
			_ = AXIsProcessTrustedWithOptions(options)
			requested = true
			urlString = "x-apple.systempreferences:com.apple.preference.security?Privacy_Accessibility"
		case "screenRecording", "screenrecording":
			if #available(macOS 10.15, *) {
				_ = CGRequestScreenCaptureAccess()
				requested = true
			}
			urlString = "x-apple.systempreferences:com.apple.preference.security?Privacy_ScreenCapture"
		default:
			throw BridgeFailure(message: "Unknown permission pane '\(kind)'", code: "invalid_args")
		}

		guard let url = URL(string: urlString) else {
			throw BridgeFailure(message: "Invalid permission pane URL", code: "internal_error")
		}
		let opened = NSWorkspace.shared.open(url)
		return ["opened": opened, "requested": requested]
	}

	private func listApps() -> [[String: Any]] {
		let frontmostPid = NSWorkspace.shared.frontmostApplication?.processIdentifier
		let apps = NSWorkspace.shared.runningApplications.filter { $0.activationPolicy == .regular }
		return apps.map { app in
			var data: [String: Any] = [
				"appName": app.localizedName ?? "Unknown App",
				"pid": Int(app.processIdentifier),
				"isFrontmost": app.processIdentifier == frontmostPid,
			]
			if let bundleId = app.bundleIdentifier {
				data["bundleId"] = bundleId
			}
			return data
		}
	}

	private func getFrontmost() throws -> [String: Any] {
		guard let app = NSWorkspace.shared.frontmostApplication else {
			throw BridgeFailure(message: "No frontmost app available", code: "frontmost_unavailable")
		}
		let pid = app.processIdentifier
		let windows = try listWindows(pid: pid)

		var result: [String: Any] = [
			"appName": app.localizedName ?? "Unknown App",
			"pid": Int(pid),
		]
		if let bundleId = app.bundleIdentifier {
			result["bundleId"] = bundleId
		}

		if let chosen = windows.sorted(by: { scoreWindow($0) > scoreWindow($1) }).first {
			result["windowTitle"] = (chosen["title"] as? String) ?? ""
			if let windowId = chosen["windowId"] {
				result["windowId"] = windowId
			}
			if let windowRef = chosen["windowRef"] as? String {
				result["windowRef"] = windowRef
			}
		}
		return result
	}

	private func getUserContext() throws -> [String: Any] {
		guard let app = NSWorkspace.shared.frontmostApplication else {
			throw BridgeFailure(message: "No frontmost app available", code: "frontmost_unavailable")
		}
		let pid = app.processIdentifier
		let appElement = AXUIElementCreateApplication(pid)
		let focusedWindow = copyAttribute(appElement, attribute: kAXFocusedWindowAttribute as CFString).flatMap(asAXElement)
		let focusedElement = copyAttribute(appElement, attribute: kAXFocusedUIElementAttribute as CFString).flatMap(asAXElement)
		var result: [String: Any] = [
			"appName": app.localizedName ?? "Unknown App",
			"pid": Int(pid),
		]
		if let bundleId = app.bundleIdentifier {
			result["bundleId"] = bundleId
		}
		if let window = focusedWindow {
			result["window"] = [
				"title": stringAttribute(window, attribute: kAXTitleAttribute as CFString) ?? "",
				"role": stringAttribute(window, attribute: kAXRoleAttribute as CFString) ?? "",
				"subrole": stringAttribute(window, attribute: kAXSubroleAttribute as CFString) ?? "",
			]
		}
		if let element = focusedElement {
			result["focusedElement"] = [
				"role": stringAttribute(element, attribute: kAXRoleAttribute as CFString) ?? "",
				"subrole": stringAttribute(element, attribute: kAXSubroleAttribute as CFString) ?? "",
				"title": stringAttribute(element, attribute: kAXTitleAttribute as CFString) ?? "",
				"description": stringAttribute(element, attribute: kAXDescriptionAttribute as CFString) ?? "",
				"value": stringAttribute(element, attribute: kAXValueAttribute as CFString) ?? "",
			]
		}
		return result
	}

	private func beginInputSuppression() throws -> [String: Any] {
		try inputSuppressionGuard.begin()
		return ["active": true]
	}

	private func endInputSuppression() -> [String: Any] {
		inputSuppressionGuard.end()
		return ["active": false]
	}

	private func restoreUserFocus(_ request: [String: Any]) throws -> [String: Any] {
		let pid = Int32(try intArg(request, "pid"))
		let targetTitle = optionalStringArg(request, "windowTitle")?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
		guard let app = NSRunningApplication(processIdentifier: pid) else {
			throw BridgeFailure(message: "App with pid \(pid) is no longer running", code: "app_not_found")
		}

		let appRestored = app.activate()
		var restoredWindowTitle = ""
		var windowRestored = false

		if !targetTitle.isEmpty {
			let appElement = AXUIElementCreateApplication(pid)
			let windows = axElementArray(appElement, attribute: kAXWindowsAttribute as CFString)
			let normalizedTarget = targetTitle.lowercased()
			if let match = windows.first(where: {
				(stringAttribute($0, attribute: kAXTitleAttribute as CFString) ?? "")
					.trimmingCharacters(in: .whitespacesAndNewlines)
					.lowercased() == normalizedTarget
			}) {
				restoredWindowTitle = stringAttribute(match, attribute: kAXTitleAttribute as CFString) ?? ""
				let setMainStatus = AXUIElementSetAttributeValue(match, kAXMainAttribute as CFString, kCFBooleanTrue)
				let setFocusedStatus = AXUIElementSetAttributeValue(match, kAXFocusedAttribute as CFString, kCFBooleanTrue)
				let raiseStatus = AXUIElementPerformAction(match, kAXRaiseAction as CFString)
				windowRestored = setMainStatus == .success || setFocusedStatus == .success || raiseStatus == .success
			}
		}

		return [
			"restored": appRestored || windowRestored,
			"appRestored": appRestored,
			"windowRestored": windowRestored,
			"appName": app.localizedName ?? "Unknown App",
			"windowTitle": restoredWindowTitle,
		]
	}

	private func setWindowFrame(_ request: [String: Any]) throws -> [String: Any] {
		let pid = Int32(try intArg(request, "pid"))
		let windowId = optionalIntArg(request, "windowId").map { UInt32($0) }
		let windowRef = optionalStringArg(request, "windowRef")
		guard let window = windowElement(pid: pid, windowId: windowId, windowRef: windowRef) else {
			return ["ok": false, "reason": "window_not_found"]
		}
		let x = try doubleArg(request, "x")
		let y = try doubleArg(request, "y")
		let width = max(100.0, try doubleArg(request, "width"))
		let height = max(80.0, try doubleArg(request, "height"))
		var origin = CGPoint(x: x, y: y)
		var size = CGSize(width: width, height: height)
		guard let originValue = AXValueCreate(.cgPoint, &origin), let sizeValue = AXValueCreate(.cgSize, &size) else {
			throw BridgeFailure(message: "Failed to create AX frame values", code: "frame_value_failed")
		}
		let positionStatus = AXUIElementSetAttributeValue(window, kAXPositionAttribute as CFString, originValue)
		let sizeStatus = AXUIElementSetAttributeValue(window, kAXSizeAttribute as CFString, sizeValue)
		let frame = frameForWindow(window)
		return [
			"ok": positionStatus == .success || sizeStatus == .success,
			"positionStatus": Int(positionStatus.rawValue),
			"sizeStatus": Int(sizeStatus.rawValue),
			"framePoints": ["x": frame.origin.x, "y": frame.origin.y, "w": frame.width, "h": frame.height],
		]
	}

	private func focusWindow(_ request: [String: Any]) throws -> [String: Any] {
		let pid = Int32(try intArg(request, "pid"))
		let windowId = optionalIntArg(request, "windowId").map { UInt32($0) }
		let windowRef = optionalStringArg(request, "windowRef")
		guard let window = windowElement(pid: pid, windowId: windowId, windowRef: windowRef) else {
			return ["focused": false, "reason": "window_not_found"]
		}

		let appElement = AXUIElementCreateApplication(pid)
		if let focusedWindow = copyAttribute(appElement, attribute: kAXFocusedWindowAttribute as CFString).flatMap(asAXElement),
			sameElement(focusedWindow, window)
		{
			return ["focused": true, "alreadyFocused": true]
		}

		let setMainStatus = AXUIElementSetAttributeValue(window, kAXMainAttribute as CFString, kCFBooleanTrue)
		let setFocusedStatus = AXUIElementSetAttributeValue(window, kAXFocusedAttribute as CFString, kCFBooleanTrue)
		let raiseStatus = AXUIElementPerformAction(window, kAXRaiseAction as CFString)
		let focused = setMainStatus == .success || setFocusedStatus == .success || raiseStatus == .success
		var result: [String: Any] = [
			"focused": focused,
			"setMain": setMainStatus == .success,
			"setFocused": setFocusedStatus == .success,
			"raised": raiseStatus == .success,
		]
		if !focused {
			result["reason"] = "focus_failed"
		}
		return result
	}

	private func scoreWindow(_ window: [String: Any]) -> Int {
		var score = 0
		if (window["isFocused"] as? Bool) == true { score += 100 }
		if (window["isMain"] as? Bool) == true { score += 80 }
		if (window["isMinimized"] as? Bool) == false { score += 40 }
		if (window["isOnscreen"] as? Bool) == true { score += 20 }
		if window["windowId"] != nil { score += 10 }
		return score
	}

	private func listWindows(pid: Int32) throws -> [[String: Any]] {
		let appElement = AXUIElementCreateApplication(pid)
		AXUIElementSetMessagingTimeout(appElement, 1.0)
		let windows = axElementArray(appElement, attribute: kAXWindowsAttribute as CFString)
		let candidates = cgWindowCandidates(pid: pid)
		var usedIds = Set<UInt32>()

		var output: [[String: Any]] = []
		for window in windows {
			let axTitle = stringAttribute(window, attribute: kAXTitleAttribute as CFString) ?? ""
			let axFrame = frameForWindow(window)
			let candidate = bestCandidate(frame: axFrame, title: axTitle, candidates: candidates, usedIds: usedIds)
			if let candidate {
				usedIds.insert(candidate.windowId)
			}

			let effectiveFrame = axFrame.width > 1 && axFrame.height > 1 ? axFrame : (candidate?.bounds ?? axFrame)
			if effectiveFrame.width < 100 || effectiveFrame.height < 80 { continue }
			let hasUsableAXFrame = axFrame.width > 1 && axFrame.height > 1
			let title = hasUsableAXFrame && !axTitle.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty ? axTitle : (candidate?.title.isEmpty == false ? candidate!.title : axTitle)
			let windowRef = refStore.storeWindow(window)
			let isMinimized = boolAttribute(window, attribute: kAXMinimizedAttribute as CFString) ?? false
			let isMain = boolAttribute(window, attribute: kAXMainAttribute as CFString) ?? false
			let isFocused = boolAttribute(window, attribute: kAXFocusedAttribute as CFString) ?? false
			let scale = displayScaleFactor(for: effectiveFrame)

			var item: [String: Any] = [
				"windowRef": windowRef,
				"title": title,
				"framePoints": [
					"x": effectiveFrame.origin.x,
					"y": effectiveFrame.origin.y,
					"w": effectiveFrame.size.width,
					"h": effectiveFrame.size.height,
				],
				"scaleFactor": scale,
				"isMinimized": isMinimized,
				"isOnscreen": candidate?.isOnscreen ?? !isMinimized,
				"isMain": isMain,
				"isFocused": isFocused,
			]
			if let candidate {
				item["windowId"] = Int(candidate.windowId)
			}
			output.append(item)
		}
		return output
	}

	private func screenshot(_ request: [String: Any]) throws -> [String: Any] {
		let windowId = UInt32(try intArg(request, "windowId"))
		return try captureWindow(windowId: windowId)
	}

	private func mouseClick(_ request: [String: Any]) throws -> [String: Any] {
		let windowId = UInt32(try intArg(request, "windowId"))
		let x = try doubleArg(request, "x")
		let y = try doubleArg(request, "y")
		guard let targetPid = optionalIntArg(request, "pid").map({ Int32($0) }) else {
			throw BridgeFailure(message: "mouseClick requires pid in non-intrusive mode", code: "pid_required")
		}
		let captureWidth = max(1.0, (try? doubleArg(request, "captureWidth")) ?? 1.0)
		let captureHeight = max(1.0, (try? doubleArg(request, "captureHeight")) ?? 1.0)
		let button = mouseButton(optionalStringArg(request, "button") ?? "left")
		let clickCount = max(1, min(3, optionalIntArg(request, "clickCount") ?? 1))
		let point = try mapWindowPoint(windowId: windowId, x: x, y: y, captureWidth: captureWidth, captureHeight: captureHeight)
		try postMouseClick(at: point, pid: targetPid, button: button, clickCount: clickCount)
		return ["clicked": true]
	}

	private func mouseMove(_ request: [String: Any]) throws -> [String: Any] {
		let windowId = UInt32(try intArg(request, "windowId"))
		let x = try doubleArg(request, "x")
		let y = try doubleArg(request, "y")
		guard let targetPid = optionalIntArg(request, "pid").map({ Int32($0) }) else {
			throw BridgeFailure(message: "mouseMove requires pid in non-intrusive mode", code: "pid_required")
		}
		let captureWidth = max(1.0, (try? doubleArg(request, "captureWidth")) ?? 1.0)
		let captureHeight = max(1.0, (try? doubleArg(request, "captureHeight")) ?? 1.0)
		let point = try mapWindowPoint(windowId: windowId, x: x, y: y, captureWidth: captureWidth, captureHeight: captureHeight)
		try postMouseMove(to: point, pid: targetPid)
		return ["moved": true]
	}

	private func mouseDrag(_ request: [String: Any]) throws -> [String: Any] {
		let windowId = UInt32(try intArg(request, "windowId"))
		guard let targetPid = optionalIntArg(request, "pid").map({ Int32($0) }) else {
			throw BridgeFailure(message: "mouseDrag requires pid in non-intrusive mode", code: "pid_required")
		}
		guard let rawPath = request["path"] as? [[String: Any]], rawPath.count >= 2 else {
			throw BridgeFailure(message: "mouseDrag requires a path with at least two points", code: "invalid_args")
		}
		let captureWidth = max(1.0, (try? doubleArg(request, "captureWidth")) ?? 1.0)
		let captureHeight = max(1.0, (try? doubleArg(request, "captureHeight")) ?? 1.0)
		let points = try rawPath.map { rawPoint -> CGPoint in
			guard let x = (rawPoint["x"] as? NSNumber)?.doubleValue,
				let y = (rawPoint["y"] as? NSNumber)?.doubleValue
			else {
				throw BridgeFailure(message: "mouseDrag path entries must include numeric x and y", code: "invalid_args")
			}
			return try mapWindowPoint(windowId: windowId, x: x, y: y, captureWidth: captureWidth, captureHeight: captureHeight)
		}
		try postMouseDrag(points: points, pid: targetPid)
		return ["dragged": true]
	}

	private func scrollWheel(_ request: [String: Any]) throws -> [String: Any] {
		let windowId = UInt32(try intArg(request, "windowId"))
		let x = try doubleArg(request, "x")
		let y = try doubleArg(request, "y")
		guard let targetPid = optionalIntArg(request, "pid").map({ Int32($0) }) else {
			throw BridgeFailure(message: "scrollWheel requires pid in non-intrusive mode", code: "pid_required")
		}
		let captureWidth = max(1.0, (try? doubleArg(request, "captureWidth")) ?? 1.0)
		let captureHeight = max(1.0, (try? doubleArg(request, "captureHeight")) ?? 1.0)
		let scrollX = optionalIntArg(request, "scrollX") ?? 0
		let scrollY = optionalIntArg(request, "scrollY") ?? 0
		let point = try mapWindowPoint(windowId: windowId, x: x, y: y, captureWidth: captureWidth, captureHeight: captureHeight)
		try postScrollWheel(at: point, deltaX: scrollX, deltaY: scrollY, pid: targetPid)
		return ["scrolled": true]
	}

	private func keyPress(_ request: [String: Any]) throws -> [String: Any] {
		guard let targetPid = optionalIntArg(request, "pid").map({ Int32($0) }) else {
			throw BridgeFailure(message: "keyPress requires pid in non-intrusive mode", code: "pid_required")
		}
		guard let keys = request["keys"] as? [String], !keys.isEmpty else {
			throw BridgeFailure(message: "keyPress requires at least one key", code: "invalid_args")
		}
		try postKeyPress(keys: keys, pid: targetPid)
		return ["pressed": true]
	}

	private func axPressAtPoint(_ request: [String: Any]) throws -> [String: Any] {
		let windowId = UInt32(try intArg(request, "windowId"))
		let x = try doubleArg(request, "x")
		let y = try doubleArg(request, "y")
		guard let targetPid = optionalIntArg(request, "pid").map({ Int32($0) }) else {
			throw BridgeFailure(message: "axPressAtPoint requires pid in non-intrusive mode", code: "pid_required")
		}
		let captureWidth = max(1.0, (try? doubleArg(request, "captureWidth")) ?? 1.0)
		let captureHeight = max(1.0, (try? doubleArg(request, "captureHeight")) ?? 1.0)

		let point = try mapWindowPoint(windowId: windowId, x: x, y: y, captureWidth: captureWidth, captureHeight: captureHeight)
		guard let hitElement = hitTestElement(at: point) else {
			return ["pressed": false, "reason": "hit_test_failed"]
		}

		let result = performActionOrAncestor(startingAt: hitElement, action: kAXPressAction as CFString, targetPid: targetPid)
		var output: [String: Any] = [
			"pressed": result["performed"] as? Bool ?? false,
		]
		if let reason = result["reason"] as? String {
			output["reason"] = reason
		}
		if let ownerPid = result["ownerPid"] {
			output["ownerPid"] = ownerPid
		}
		return output
	}

	private func axFindTextInput(_ request: [String: Any]) throws -> [String: Any] {
		let pid = Int32(try intArg(request, "pid"))
		let windowId = optionalIntArg(request, "windowId").map { UInt32($0) }
		let windowRef = optionalStringArg(request, "windowRef")
		guard let window = windowElement(pid: pid, windowId: windowId, windowRef: windowRef) else {
			return ["found": false, "reason": "window_not_found"]
		}
		let textRoles: Set<String> = [
			"AXTextField", "AXTextArea", "AXTextView", "AXSearchField", "AXComboBox", "AXEditableText", "AXSecureTextField",
		]
		let elements = collectDescendants(startingAt: window, maxDepth: 8)
		let ranked = elements.compactMap { candidate -> (AXUIElement, Double)? in
			let role = self.stringAttribute(candidate, attribute: kAXRoleAttribute as CFString) ?? ""
			var valueSettable = DarwinBoolean(false)
			let valueStatus = AXUIElementIsAttributeSettable(candidate, kAXValueAttribute as CFString, &valueSettable)
			let canSetValue = valueStatus == .success && valueSettable.boolValue
			guard textRoles.contains(role) || canSetValue else { return nil }
			return (candidate, self.scoreTextInputElement(candidate, role: role))
		}.sorted { $0.1 > $1.1 }
		guard let best = ranked.first else {
			return ["found": false, "reason": "no_text_input"]
		}
		return rankedElementPayload(best: best, ranked: ranked, key: "found")
	}

	private func axFocusTextInput(_ request: [String: Any]) throws -> [String: Any] {
		let found = try axFindTextInput(request)
		guard (found["found"] as? Bool) == true, let elementRef = found["elementRef"] as? String else {
			return found
		}
		guard let element = refStore.element(for: elementRef) else {
			return ["focused": false, "reason": "element_ref_invalid"]
		}
		var settable = DarwinBoolean(false)
		let status = AXUIElementIsAttributeSettable(element, kAXFocusedAttribute as CFString, &settable)
		guard status == .success && settable.boolValue else {
			var payload = found
			payload["focused"] = false
			payload["reason"] = "not_focusable"
			return payload
		}
		let setStatus = AXUIElementSetAttributeValue(element, kAXFocusedAttribute as CFString, kCFBooleanTrue)
		var payload = found
		payload["focused"] = (setStatus == .success)
		if setStatus != .success {
			payload["reason"] = "focus_failed"
		}
		return payload
	}

	private func axListTargets(_ request: [String: Any]) throws -> [String: Any] {
		let pid = Int32(try intArg(request, "pid"))
		let windowId = optionalIntArg(request, "windowId").map { UInt32($0) }
		let windowRef = optionalStringArg(request, "windowRef")
		let limit = max(1, min(50, optionalIntArg(request, "limit") ?? 12))
		guard let window = windowElement(pid: pid, windowId: windowId, windowRef: windowRef) else {
			return ["targets": [], "reason": "window_not_found"]
		}
		let textRoles: Set<String> = [
			"AXTextField", "AXTextArea", "AXTextView", "AXSearchField", "AXComboBox", "AXEditableText", "AXSecureTextField",
		]
		let structuralRoles: Set<String> = [
			"AXApplication", "AXWindow", "AXToolbar", "AXGroup", "AXScrollArea", "AXSplitGroup", "AXLayoutArea", "AXTabGroup", "AXWebArea",
		]
		let browserBundleIds: Set<String> = [
			"com.apple.Safari", "com.google.Chrome", "org.chromium.Chromium", "company.thebrowser.Browser", "com.brave.Browser", "com.microsoft.edgemac", "com.vivaldi.Vivaldi", "net.imput.helium", "org.mozilla.firefox",
		]
		let windowFrame = frameForWindow(window)
		let windowArea = max(1.0, windowFrame.width * windowFrame.height)
		let isBrowser = browserBundleIds.contains(NSRunningApplication(processIdentifier: pid)?.bundleIdentifier ?? "")
		let elements = collectDescendants(startingAt: window, maxDepth: isBrowser ? 10 : 8)
		var roleCounts: [String: Int] = [:]
		var rejectedByReason: [String: Int] = [:]
		var eligibleCount = 0
		var visibleFrameCount = 0
		func reject(_ reason: String) {
			rejectedByReason[reason, default: 0] += 1
		}
		var bestByKey: [String: (AXUIElement, Double)] = [:]
		for candidate in elements {
			let role = self.stringAttribute(candidate, attribute: kAXRoleAttribute as CFString) ?? ""
			roleCounts[role.isEmpty ? "(unknown)" : role, default: 0] += 1
			let subrole = self.stringAttribute(candidate, attribute: kAXSubroleAttribute as CFString) ?? ""
			let title = self.stringAttribute(candidate, attribute: kAXTitleAttribute as CFString) ?? ""
			let description = self.stringAttribute(candidate, attribute: kAXDescriptionAttribute as CFString) ?? ""
			let value = self.stringAttribute(candidate, attribute: kAXValueAttribute as CFString) ?? ""
			let actions = self.actionNames(candidate)
			var focusedSettable = DarwinBoolean(false)
			let focusStatus = AXUIElementIsAttributeSettable(candidate, kAXFocusedAttribute as CFString, &focusedSettable)
			let canFocus = focusStatus == .success && focusedSettable.boolValue
			var valueSettable = DarwinBoolean(false)
			let valueStatus = AXUIElementIsAttributeSettable(candidate, kAXValueAttribute as CFString, &valueSettable)
			let canSetValue = valueStatus == .success && valueSettable.boolValue
			let isText = textRoles.contains(role)
			let canPress = actions.contains(kAXPressAction as String)
			let canScroll = self.supportsAnyScrollAction(candidate)
			let canAdjust = actions.contains(kAXIncrementAction as String) || actions.contains(kAXDecrementAction as String)
			if !(isText || canPress || canFocus || canScroll || canAdjust) { reject("not_interactive"); continue }
			guard let frame = self.frameForElement(candidate), frame.width > 10, frame.height > 10 else { reject("no_visible_frame"); continue }
			visibleFrameCount += 1
			let area = frame.width * frame.height
			let label = [title, description, value].first(where: { !$0.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty }) ?? ""
			let normalizedLabel = label.trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
			if structuralRoles.contains(role) {
				if normalizedLabel.isEmpty && !canScroll { reject("unlabeled_structural"); continue }
				if role == "AXWebArea" && !isBrowser { reject("non_browser_web_area"); continue }
			}
			if role == "AXTextArea" || role == "AXTextView" {
				if area > windowArea * 0.55 && !canSetValue { reject("large_unsettable_text_area"); continue }
			}
			if role == "AXButton" && normalizedLabel.isEmpty && !isBrowser { reject("unlabeled_button"); continue }
			if isBrowser && (role == "AXButton" || role == "AXLink" || role == "AXPopUpButton") && normalizedLabel.isEmpty { reject("unlabeled_browser_control"); continue }
			if actions == [kAXShowMenuAction as String] && !isText { reject("show_menu_only"); continue }
			eligibleCount += 1
			var score = 0.0
			if isText {
				score += self.scoreTextInputElement(candidate, role: role)
				if canSetValue {
					score += 160
				} else {
					score -= 80
				}
			}
			if canFocus || canPress {
				score += self.scoreFocusableElement(candidate, role: role, canFocus: canFocus, canPress: canPress, preferredRoles: Set<String>())
			}
			if canScroll { score += 130 }
			if canAdjust { score += 120 }
			if !actions.isEmpty {
				score += self.scoreActionableElement(candidate, role: role, actions: actions, preferredRoles: Set<String>())
			}
			if !normalizedLabel.isEmpty { score += 55 } else if canScroll || canAdjust || role == "AXScrollBar" { score -= 20 } else { score -= 120 }
			if !description.isEmpty { score += 18 }
			if structuralRoles.contains(role) { score -= canScroll ? 40 : 180 }
			if canScroll && role == "AXScrollArea" { score += 180 }
			if canAdjust && role == "AXScrollBar" { score += 180 }
			if area > windowArea * 0.7 && role != "AXTextField" && role != "AXSearchField" && role != "AXComboBox" { score -= 180 }
			if isBrowser && (role == "AXTextField" || role == "AXSearchField" || role == "AXComboBox") { score += 100 }
			if isBrowser && role == "AXLink" { score += 35 }
			if subrole == "AXCloseButton" { score -= 140 }
			if normalizedLabel == "close tab" { score -= 180 }
			if normalizedLabel.count > 160 { score -= 80 }
			if score < 120 { reject("low_score"); continue }
			let key = "\(role)|\(normalizedLabel)|\(Int(frame.midX / 24))|\(Int(frame.midY / 24))"
			if let existing = bestByKey[key], existing.1 >= score { continue }
			bestByKey[key] = (candidate, score)
		}
		let ranked = bestByKey.values.sorted { $0.1 > $1.1 }
		let topRoles = roleCounts.sorted { $0.value == $1.value ? $0.key < $1.key : $0.value > $1.value }.prefix(16)
		let diagnostics: [String: Any] = [
			"axTreeNodeCount": elements.count,
			"visibleInteractiveNodeCount": visibleFrameCount,
			"eligibleNodeCount": eligibleCount,
			"rankedNodeCount": ranked.count,
			"returnedTargetCount": min(limit, ranked.count),
			"roleCounts": Dictionary(uniqueKeysWithValues: topRoles.map { ($0.key, $0.value) }),
			"rejectedByReason": rejectedByReason,
		]
		return ["targets": Array(ranked.prefix(limit)).map { self.elementPayload(element: $0.0, key: "target", score: $0.1) }, "diagnostics": diagnostics]
	}

	private func axPressElement(_ request: [String: Any]) throws -> [String: Any] {
		let elementRef = try stringArg(request, "elementRef")
		guard let targetPid = optionalIntArg(request, "pid").map({ Int32($0) }) else {
			throw BridgeFailure(message: "axPressElement requires pid in non-intrusive mode", code: "pid_required")
		}
		guard let element = refStore.element(for: elementRef) else {
			return ["pressed": false, "reason": "element_ref_invalid"]
		}
		let result = performActionOrAncestor(startingAt: element, action: kAXPressAction as CFString, targetPid: targetPid)
		var output: [String: Any] = ["pressed": result["performed"] as? Bool ?? false]
		if let reason = result["reason"] as? String {
			output["reason"] = reason
		}
		if let ownerPid = result["ownerPid"] {
			output["ownerPid"] = ownerPid
		}
		return output
	}

	private func axPerformActionElement(_ request: [String: Any]) throws -> [String: Any] {
		let elementRef = try stringArg(request, "elementRef")
		let action = try axActionName(try stringArg(request, "action"))
		guard let targetPid = optionalIntArg(request, "pid").map({ Int32($0) }) else {
			throw BridgeFailure(message: "axPerformActionElement requires pid in non-intrusive mode", code: "pid_required")
		}
		guard let element = refStore.element(for: elementRef) else {
			return ["performed": false, "reason": "element_ref_invalid"]
		}
		return performActionOrAncestor(startingAt: element, action: action, targetPid: targetPid)
	}

	private func axFocusElement(_ request: [String: Any]) throws -> [String: Any] {
		let elementRef = try stringArg(request, "elementRef")
		guard let targetPid = optionalIntArg(request, "pid").map({ Int32($0) }) else {
			throw BridgeFailure(message: "axFocusElement requires pid in non-intrusive mode", code: "pid_required")
		}
		guard let element = refStore.element(for: elementRef) else {
			return ["focused": false, "reason": "element_ref_invalid"]
		}
		return focusElementOrAncestor(startingAt: element, targetPid: targetPid)
	}

	private func axFocusAtPoint(_ request: [String: Any]) throws -> [String: Any] {
		let windowId = UInt32(try intArg(request, "windowId"))
		let x = try doubleArg(request, "x")
		let y = try doubleArg(request, "y")
		guard let targetPid = optionalIntArg(request, "pid").map({ Int32($0) }) else {
			throw BridgeFailure(message: "axFocusAtPoint requires pid in non-intrusive mode", code: "pid_required")
		}
		let captureWidth = max(1.0, (try? doubleArg(request, "captureWidth")) ?? 1.0)
		let captureHeight = max(1.0, (try? doubleArg(request, "captureHeight")) ?? 1.0)

		let point = try mapWindowPoint(windowId: windowId, x: x, y: y, captureWidth: captureWidth, captureHeight: captureHeight)
		guard let hitElement = hitTestElement(at: point) else {
			return ["focused": false, "reason": "hit_test_failed"]
		}

		return focusElementOrAncestor(startingAt: hitElement, targetPid: targetPid)
	}

	private func axScrollElement(_ request: [String: Any]) throws -> [String: Any] {
		let elementRef = try stringArg(request, "elementRef")
		guard let targetPid = optionalIntArg(request, "pid").map({ Int32($0) }) else {
			throw BridgeFailure(message: "axScrollElement requires pid in non-intrusive mode", code: "pid_required")
		}
		guard let element = refStore.element(for: elementRef) else {
			return ["scrolled": false, "reason": "element_ref_invalid"]
		}
		return performScrollActionOrAncestor(startingAt: element, targetPid: targetPid, scrollX: optionalIntArg(request, "scrollX") ?? 0, scrollY: optionalIntArg(request, "scrollY") ?? 0, steps: max(1, min(8, optionalIntArg(request, "steps") ?? 1)))
	}

	private func axScrollAtPoint(_ request: [String: Any]) throws -> [String: Any] {
		let windowId = UInt32(try intArg(request, "windowId"))
		let x = try doubleArg(request, "x")
		let y = try doubleArg(request, "y")
		guard let targetPid = optionalIntArg(request, "pid").map({ Int32($0) }) else {
			throw BridgeFailure(message: "axScrollAtPoint requires pid in non-intrusive mode", code: "pid_required")
		}
		let captureWidth = max(1.0, (try? doubleArg(request, "captureWidth")) ?? 1.0)
		let captureHeight = max(1.0, (try? doubleArg(request, "captureHeight")) ?? 1.0)
		let point = try mapWindowPoint(windowId: windowId, x: x, y: y, captureWidth: captureWidth, captureHeight: captureHeight)
		guard let hitElement = hitTestElement(at: point) else {
			return ["scrolled": false, "reason": "hit_test_failed"]
		}
		return performScrollActionOrAncestor(startingAt: hitElement, targetPid: targetPid, scrollX: optionalIntArg(request, "scrollX") ?? 0, scrollY: optionalIntArg(request, "scrollY") ?? 0, steps: max(1, min(8, optionalIntArg(request, "steps") ?? 1)))
	}

	private func hitTestElement(at point: CGPoint) -> AXUIElement? {
		let systemWide = AXUIElementCreateSystemWide()
		var hitElement: AXUIElement?
		let status = AXUIElementCopyElementAtPosition(systemWide, Float(point.x), Float(point.y), &hitElement)
		guard status == .success, let hitElement else { return nil }
		return hitElement
	}

	private func axActionName(_ actionName: String) throws -> CFString {
		switch actionName.trimmingCharacters(in: .whitespacesAndNewlines).lowercased() {
		case "press":
			return kAXPressAction as CFString
		case "increment":
			return kAXIncrementAction as CFString
		case "decrement":
			return kAXDecrementAction as CFString
		case "confirm":
			return kAXConfirmAction as CFString
		case "cancel":
			return kAXCancelAction as CFString
		case "showmenu", "show_menu", "menu":
			return kAXShowMenuAction as CFString
		case "pick":
			return kAXPickAction as CFString
		default:
			throw BridgeFailure(message: "Unsupported AX action '\(actionName)'", code: "invalid_args")
		}
	}

	private let axScrollDownAction = "AXScrollDown" as CFString
	private let axScrollUpAction = "AXScrollUp" as CFString
	private let axScrollLeftAction = "AXScrollLeft" as CFString
	private let axScrollRightAction = "AXScrollRight" as CFString

	private func scrollActionNames(scrollX: Int, scrollY: Int) -> [CFString] {
		var actions: [CFString] = []
		if scrollY > 0 { actions.append(axScrollDownAction) }
		if scrollY < 0 { actions.append(axScrollUpAction) }
		if scrollX > 0 { actions.append(axScrollRightAction) }
		if scrollX < 0 { actions.append(axScrollLeftAction) }
		return actions
	}

	private func supportsAnyScrollAction(_ element: AXUIElement) -> Bool {
		let actions = Set(actionNames(element))
		return actions.contains(axScrollDownAction as String) || actions.contains(axScrollUpAction as String) || actions.contains(axScrollLeftAction as String) || actions.contains(axScrollRightAction as String)
	}

	private func performScrollActionOrAncestor(startingAt element: AXUIElement, targetPid: Int32, scrollX: Int, scrollY: Int, steps: Int) -> [String: Any] {
		let actions = scrollActionNames(scrollX: scrollX, scrollY: scrollY)
		guard !actions.isEmpty else { return ["scrolled": false, "reason": "zero_delta"] }
		var current: AXUIElement? = element
		var depth = 0

		while let candidate = current, depth < 10 {
			if let pid = pidForElement(candidate), pid != targetPid {
				return ["scrolled": false, "reason": "pid_mismatch", "ownerPid": Int(pid)]
			}
			var didScroll = false
			for _ in 0..<steps {
				for action in actions where supportsAction(candidate, action: action) {
					let status = AXUIElementPerformAction(candidate, action)
					if status == .success { didScroll = true }
				}
			}
			if didScroll { return ["scrolled": true] }
			current = parentElement(candidate)
			depth += 1
		}

		return ["scrolled": false, "reason": "no_scroll_action"]
	}

	private func performActionOrAncestor(startingAt element: AXUIElement, action: CFString, targetPid: Int32) -> [String: Any] {
		var current: AXUIElement? = element
		var depth = 0

		while let candidate = current, depth < 10 {
			if let pid = pidForElement(candidate), pid != targetPid {
				return ["performed": false, "reason": "pid_mismatch", "ownerPid": Int(pid)]
			}

			if supportsAction(candidate, action: action) {
				let actionStatus = AXUIElementPerformAction(candidate, action)
				if actionStatus == .success {
					return ["performed": true]
				}
			}

			current = parentElement(candidate)
			depth += 1
		}

		return ["performed": false, "reason": "no_matching_action"]
	}

	private func focusElementOrAncestor(startingAt element: AXUIElement, targetPid: Int32) -> [String: Any] {
		var current: AXUIElement? = element
		var depth = 0

		while let candidate = current, depth < 10 {
			if let pid = pidForElement(candidate), pid != targetPid {
				return ["focused": false, "reason": "pid_mismatch", "ownerPid": Int(pid)]
			}

			var settable = DarwinBoolean(false)
			let status = AXUIElementIsAttributeSettable(candidate, kAXFocusedAttribute as CFString, &settable)
			if status == .success && settable.boolValue {
				let setStatus = AXUIElementSetAttributeValue(candidate, kAXFocusedAttribute as CFString, kCFBooleanTrue)
				if setStatus == .success {
					return ["focused": true]
				}
			}

			current = parentElement(candidate)
			depth += 1
		}

		return ["focused": false, "reason": "no_focusable_ancestor"]
	}

	private func windowElement(pid: Int32, windowId: UInt32?, windowRef: String? = nil) -> AXUIElement? {
		if let windowRef, let stored = refStore.window(for: windowRef) {
			AXUIElementSetMessagingTimeout(stored, 1.0)
			var ownerPid: pid_t = 0
			if AXUIElementGetPid(stored, &ownerPid) == .success, ownerPid == pid {
				return stored
			}
		}

		let appElement = AXUIElementCreateApplication(pid)
		AXUIElementSetMessagingTimeout(appElement, 1.0)
		let windows = axElementArray(appElement, attribute: kAXWindowsAttribute as CFString)
		guard !windows.isEmpty else { return nil }
		guard let windowId else {
			return windows.first
		}
		let candidates = cgWindowCandidates(pid: pid)
		for window in windows {
			let title = stringAttribute(window, attribute: kAXTitleAttribute as CFString) ?? ""
			let frame = frameForWindow(window)
			if let candidate = bestCandidate(frame: frame, title: title, candidates: candidates, usedIds: []), candidate.windowId == windowId {
				return window
			}
		}
		return nil
	}

	private func findDescendant(startingAt root: AXUIElement, maxDepth: Int, predicate: (AXUIElement) -> Bool) -> AXUIElement? {
		collectDescendants(startingAt: root, maxDepth: maxDepth).first(where: predicate)
	}

	private func collectDescendants(startingAt root: AXUIElement, maxDepth: Int) -> [AXUIElement] {
		var queue: [(AXUIElement, Int)] = [(root, 0)]
		var index = 0
		var output: [AXUIElement] = []
		while index < queue.count {
			let (element, depth) = queue[index]
			index += 1
			output.append(element)
			if depth >= maxDepth { continue }
			let children = axElementArray(element, attribute: kAXChildrenAttribute as CFString)
			for child in children {
				queue.append((child, depth + 1))
			}
		}
		return output
	}

	private func scoreTextInputElement(_ element: AXUIElement, role: String) -> Double {
		var score = 0.0
		if role == "AXSearchField" { score += 120 }
		if role == "AXTextField" { score += 100 }
		if role == "AXComboBox" { score += 80 }
		if role == "AXTextArea" || role == "AXTextView" || role == "AXEditableText" { score += 70 }
		if role == "AXSecureTextField" { score -= 40 }
		if let frame = frameForElement(element) {
			score += min(120, Double(frame.width * frame.height) / 5000.0)
			if frame.width > 40 && frame.height > 16 { score += 20 }
			if frame.origin.y < 220 { score += 15 }
		} else {
			score -= 100
		}
		let title = stringAttribute(element, attribute: kAXTitleAttribute as CFString) ?? ""
		let value = stringAttribute(element, attribute: kAXValueAttribute as CFString) ?? ""
		if !title.isEmpty { score += 10 }
		if !value.isEmpty { score += 5 }
		return score
	}

	private func scoreFocusableElement(
		_ element: AXUIElement,
		role: String,
		canFocus: Bool,
		canPress: Bool,
		preferredRoles: Set<String>
	) -> Double {
		var score = 0.0
		if canPress { score += 80 }
		if canFocus { score += 70 }
		if !preferredRoles.isEmpty && preferredRoles.contains(role) { score += 40 }
		switch role {
		case "AXButton": score += 60
		case "AXTextField", "AXSearchField", "AXTextArea", "AXTextView": score += 50
		case "AXList", "AXOutline", "AXRow", "AXCell", "AXLink": score += 35
		case "AXGroup", "AXToolbar", "AXWindow", "AXApplication": score -= 60
		default: break
		}
		if let frame = frameForElement(element) {
			score += min(100, Double(frame.width * frame.height) / 6000.0)
			if frame.width > 24 && frame.height > 14 { score += 10 }
		} else {
			score -= 100
		}
		if !actionNames(element).isEmpty { score += 10 }
		return score
	}

	private func scoreActionableElement(
		_ element: AXUIElement,
		role: String,
		actions: [String],
		preferredRoles: Set<String>
	) -> Double {
		var score = 0.0
		if !preferredRoles.isEmpty && preferredRoles.contains(role) { score += 40 }
		if actions.contains(kAXPressAction as String) { score += 100 }
		if actions.contains(kAXShowMenuAction as String) { score += 50 }
		if actions.contains(kAXPickAction as String) { score += 45 }
		if actions.contains(kAXConfirmAction as String) { score += 35 }
		if actions.contains(kAXIncrementAction as String) { score += 55 }
		if actions.contains(kAXDecrementAction as String) { score += 55 }
		switch role {
		case "AXButton": score += 70
		case "AXLink": score += 60
		case "AXScrollBar": score += 80
		case "AXRow", "AXCell", "AXList", "AXOutline": score += 40
		case "AXGroup", "AXToolbar", "AXWindow", "AXApplication": score -= 60
		default: break
		}
		if let frame = frameForElement(element) {
			score += min(100, Double(frame.width * frame.height) / 6000.0)
			if frame.width > 20 && frame.height > 14 { score += 10 }
		} else {
			score -= 100
		}
		if !actions.isEmpty { score += Double(min(actions.count, 5) * 4) }
		return score
	}

	private func frameForElement(_ element: AXUIElement) -> CGRect? {
		let origin = pointAttribute(element, attribute: kAXPositionAttribute as CFString)
		let size = sizeAttribute(element, attribute: kAXSizeAttribute as CFString)
		guard let origin, let size, size.width > 0, size.height > 0 else { return nil }
		return CGRect(origin: origin, size: size)
	}

	private func rankedElementPayload(best: (AXUIElement, Double), ranked: [(AXUIElement, Double)], key: String) -> [String: Any] {
		var payload = elementPayload(element: best.0, key: key, score: best.1)
		payload["confidence"] = confidenceLabel(ranked)
		payload["candidates"] = Array(ranked.prefix(3)).map { candidate, score in
			candidateSummary(element: candidate, score: score)
		}
		return payload
	}

	private func confidenceLabel(_ ranked: [(AXUIElement, Double)]) -> String {
		guard let first = ranked.first else { return "none" }
		guard ranked.count > 1 else { return "high" }
		let delta = first.1 - ranked[1].1
		if delta >= 40 { return "high" }
		if delta >= 15 { return "medium" }
		return "low"
	}

	private func candidateSummary(element: AXUIElement, score: Double) -> [String: Any] {
		let role = stringAttribute(element, attribute: kAXRoleAttribute as CFString) ?? ""
		let subrole = stringAttribute(element, attribute: kAXSubroleAttribute as CFString) ?? ""
		let title = stringAttribute(element, attribute: kAXTitleAttribute as CFString) ?? ""
		let description = stringAttribute(element, attribute: kAXDescriptionAttribute as CFString) ?? ""
		let value = stringAttribute(element, attribute: kAXValueAttribute as CFString) ?? ""
		var summary: [String: Any] = [
			"role": role,
			"subrole": subrole,
			"title": title,
			"description": description,
			"value": value,
			"score": score,
			"actions": actionNames(element),
		]
		if let frame = frameForElement(element) {
			summary["frame"] = ["x": frame.origin.x, "y": frame.origin.y, "w": frame.width, "h": frame.height]
		}
		return summary
	}

	private func elementPayload(element: AXUIElement, key: String, score: Double? = nil) -> [String: Any] {
		let role = stringAttribute(element, attribute: kAXRoleAttribute as CFString) ?? ""
		let subrole = stringAttribute(element, attribute: kAXSubroleAttribute as CFString) ?? ""
		let title = stringAttribute(element, attribute: kAXTitleAttribute as CFString) ?? ""
		let description = stringAttribute(element, attribute: kAXDescriptionAttribute as CFString) ?? ""
		let value = stringAttribute(element, attribute: kAXValueAttribute as CFString) ?? ""
		let frame = frameForElement(element)
		let centerX = frame.map { $0.midX } ?? 0
		let centerY = frame.map { $0.midY } ?? 0
		var valueSettable = DarwinBoolean(false)
		let valueStatus = AXUIElementIsAttributeSettable(element, kAXValueAttribute as CFString, &valueSettable)
		var focusedSettable = DarwinBoolean(false)
		let focusedStatus = AXUIElementIsAttributeSettable(element, kAXFocusedAttribute as CFString, &focusedSettable)
		let actions = actionNames(element)
		let canSetValue = valueStatus == .success && valueSettable.boolValue
		let textRoles: Set<String> = [
			"AXTextField", "AXTextArea", "AXTextView", "AXSearchField", "AXComboBox", "AXEditableText", "AXSecureTextField",
		]
		var payload: [String: Any] = [
			key: true,
			"elementRef": refStore.storeElement(element),
			"role": role,
			"subrole": subrole,
			"title": title,
			"description": description,
			"value": value,
			"actions": actions,
			"isTextInput": textRoles.contains(role),
			"canSetValue": canSetValue,
			"canFocus": focusedStatus == .success && focusedSettable.boolValue,
			"canPress": actions.contains(kAXPressAction as String),
			"canScroll": supportsAnyScrollAction(element),
			"canIncrement": actions.contains(kAXIncrementAction as String),
			"canDecrement": actions.contains(kAXDecrementAction as String),
			"x": centerX,
			"y": centerY,
		]
		if let frame {
			payload["frame"] = ["x": frame.origin.x, "y": frame.origin.y, "w": frame.width, "h": frame.height]
		}
		if let score {
			payload["score"] = score
		}
		return payload
	}

	private func pidForElement(_ element: AXUIElement) -> Int32? {
		var pid: pid_t = 0
		let status = AXUIElementGetPid(element, &pid)
		guard status == .success else { return nil }
		return Int32(pid)
	}

	private func parentElement(_ element: AXUIElement) -> AXUIElement? {
		guard let value = copyAttribute(element, attribute: kAXParentAttribute as CFString) else {
			return nil
		}
		return asAXElement(value)
	}

	private func sameElement(_ lhs: AXUIElement, _ rhs: AXUIElement) -> Bool {
		CFEqual(lhs as CFTypeRef, rhs as CFTypeRef)
	}

	private func isElement(_ element: AXUIElement, descendantOf ancestor: AXUIElement) -> Bool {
		var current: AXUIElement? = element
		var depth = 0
		while let candidate = current, depth < 20 {
			if sameElement(candidate, ancestor) {
				return true
			}
			current = parentElement(candidate)
			depth += 1
		}
		return false
	}

	private func actionNames(_ element: AXUIElement) -> [String] {
		var actionsValue: CFArray?
		let status = AXUIElementCopyActionNames(element, &actionsValue)
		guard status == .success else { return [] }
		guard let actionsArray = actionsValue as? [AnyObject] else { return [] }
		return actionsArray.compactMap { $0 as? String }
	}

	private func supportsAction(_ element: AXUIElement, action: CFString) -> Bool {
		actionNames(element).contains(action as String)
	}

	private func focusedElement(_ request: [String: Any]) throws -> [String: Any] {
		let pid = Int32(try intArg(request, "pid"))
		let windowId = optionalIntArg(request, "windowId").map { UInt32($0) }
		let windowRef = optionalStringArg(request, "windowRef")
		let app = AXUIElementCreateApplication(pid)
		guard let focusedValue = copyAttribute(app, attribute: kAXFocusedUIElementAttribute as CFString),
			let element = asAXElement(focusedValue)
		else {
			return ["exists": false]
		}
		if windowId != nil || windowRef != nil {
			guard let window = windowElement(pid: pid, windowId: windowId, windowRef: windowRef) else {
				return ["exists": false, "reason": "window_not_found"]
			}
			guard isElement(element, descendantOf: window) else {
				return ["exists": false, "reason": "focused_element_outside_window"]
			}
		}

		let role = stringAttribute(element, attribute: kAXRoleAttribute as CFString) ?? ""
		let subrole = stringAttribute(element, attribute: kAXSubroleAttribute as CFString) ?? ""
		let secure = role == "AXSecureTextField" || subrole == "AXSecureTextField"

		var settable = DarwinBoolean(false)
		let settableStatus = AXUIElementIsAttributeSettable(element, kAXValueAttribute as CFString, &settable)
		let canSetValue = settableStatus == .success && settable.boolValue

		let textRoles: Set<String> = [
			"AXTextField",
			"AXTextArea",
			"AXTextView",
			"AXSearchField",
			"AXComboBox",
			"AXEditableText",
			"AXSecureTextField",
		]

		let isTextInput = textRoles.contains(role) || canSetValue
		let elementRef = refStore.storeElement(element)

		return [
			"exists": true,
			"elementRef": elementRef,
			"role": role,
			"subrole": subrole,
			"isTextInput": isTextInput,
			"isSecure": secure,
			"canSetValue": canSetValue,
		]
	}

	private func setValue(_ request: [String: Any]) throws -> [String: Any] {
		let elementRef = try stringArg(request, "elementRef")
		let value = try stringArg(request, "value")
		guard let element = refStore.element(for: elementRef) else {
			throw BridgeFailure(message: "Element reference is no longer valid", code: "element_ref_invalid")
		}

		let status = AXUIElementSetAttributeValue(element, kAXValueAttribute as CFString, value as CFTypeRef)
		if status != .success {
			throw BridgeFailure(message: "Failed to set value (AX error \(status.rawValue))", code: "set_value_failed")
		}
		return ["set": true]
	}

	private func typeText(_ request: [String: Any]) throws -> [String: Any] {
		let text = try stringArg(request, "text")
		guard let targetPid = optionalIntArg(request, "pid").map({ Int32($0) }) else {
			throw BridgeFailure(message: "typeText requires pid in non-intrusive mode", code: "pid_required")
		}
		try postUnicodeText(text, pid: targetPid)
		return ["typed": true]
	}

	private func getMousePosition() -> [String: Any] {
		let position = NSEvent.mouseLocation
		return ["x": position.x, "y": position.y]
	}

	private func copyAttribute(_ element: AXUIElement, attribute: CFString) -> AnyObject? {
		var value: AnyObject?
		let status = AXUIElementCopyAttributeValue(element, attribute, &value)
		guard status == .success else { return nil }
		return value
	}

	private func boolAttribute(_ element: AXUIElement, attribute: CFString) -> Bool? {
		guard let value = copyAttribute(element, attribute: attribute) else { return nil }
		if let boolValue = value as? Bool {
			return boolValue
		}
		if let number = value as? NSNumber {
			return number.boolValue
		}
		return nil
	}

	private func stringAttribute(_ element: AXUIElement, attribute: CFString) -> String? {
		copyAttribute(element, attribute: attribute) as? String
	}

	private func axElementArray(_ element: AXUIElement, attribute: CFString) -> [AXUIElement] {
		guard let value = copyAttribute(element, attribute: attribute) else { return [] }
		if let array = value as? [AXUIElement] {
			return array
		}
		if let anyArray = value as? [AnyObject] {
			return anyArray.compactMap(asAXElement)
		}
		return []
	}

	private func asAXElement(_ value: AnyObject) -> AXUIElement? {
		let cfValue = value as CFTypeRef
		guard CFGetTypeID(cfValue) == AXUIElementGetTypeID() else { return nil }
		return unsafeBitCast(cfValue, to: AXUIElement.self)
	}

	private func pointAttribute(_ element: AXUIElement, attribute: CFString) -> CGPoint? {
		guard let value = copyAttribute(element, attribute: attribute) else { return nil }
		let cfValue = value as CFTypeRef
		guard CFGetTypeID(cfValue) == AXValueGetTypeID() else { return nil }
		let axValue = unsafeBitCast(cfValue, to: AXValue.self)
		guard AXValueGetType(axValue) == .cgPoint else { return nil }
		var point = CGPoint.zero
		guard AXValueGetValue(axValue, .cgPoint, &point) else { return nil }
		return point
	}

	private func sizeAttribute(_ element: AXUIElement, attribute: CFString) -> CGSize? {
		guard let value = copyAttribute(element, attribute: attribute) else { return nil }
		let cfValue = value as CFTypeRef
		guard CFGetTypeID(cfValue) == AXValueGetTypeID() else { return nil }
		let axValue = unsafeBitCast(cfValue, to: AXValue.self)
		guard AXValueGetType(axValue) == .cgSize else { return nil }
		var size = CGSize.zero
		guard AXValueGetValue(axValue, .cgSize, &size) else { return nil }
		return size
	}

	private func frameForWindow(_ window: AXUIElement) -> CGRect {
		let origin = pointAttribute(window, attribute: kAXPositionAttribute as CFString) ?? .zero
		let size = sizeAttribute(window, attribute: kAXSizeAttribute as CFString) ?? .zero
		return CGRect(origin: origin, size: size)
	}

	private func cgWindowCandidates(pid: Int32) -> [CGWindowCandidate] {
		guard let entries = CGWindowListCopyWindowInfo([.optionAll], kCGNullWindowID) as? [[String: Any]] else {
			return []
		}

		var candidates: [CGWindowCandidate] = []
		for entry in entries {
			guard let ownerPid = (entry[kCGWindowOwnerPID as String] as? NSNumber)?.int32Value,
				ownerPid == pid
			else {
				continue
			}
			let layer = (entry[kCGWindowLayer as String] as? NSNumber)?.intValue ?? 0
			if layer != 0 { continue }

			guard let windowNumber = (entry[kCGWindowNumber as String] as? NSNumber)?.uint32Value else {
				continue
			}
			guard let boundsDict = entry[kCGWindowBounds as String] as? [String: Any],
				let bounds = CGRect(dictionaryRepresentation: boundsDict as CFDictionary)
			else {
				continue
			}

			let title = (entry[kCGWindowName as String] as? String) ?? ""
			let isOnscreen = (entry[kCGWindowIsOnscreen as String] as? NSNumber)?.boolValue ?? true
			candidates.append(
				CGWindowCandidate(
					windowId: windowNumber,
					title: title,
					bounds: bounds,
					isOnscreen: isOnscreen
				)
			)
		}
		return candidates
	}

	private func bestCandidate(
		frame: CGRect,
		title: String,
		candidates: [CGWindowCandidate],
		usedIds: Set<UInt32>
	) -> CGWindowCandidate? {
		var best: (candidate: CGWindowCandidate, score: Double)?
		let normalizedTitle = title.trimmingCharacters(in: .whitespacesAndNewlines).lowercased()

		for candidate in candidates where !usedIds.contains(candidate.windowId) {
			var score = 0.0
			let candidateTitle = candidate.title.trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
			if !normalizedTitle.isEmpty {
				if candidateTitle == normalizedTitle {
					score += 100
				} else if candidateTitle.contains(normalizedTitle) {
					score += 50
				}
			}

			let dx = abs(candidate.bounds.origin.x - frame.origin.x)
			let dy = abs(candidate.bounds.origin.y - frame.origin.y)
			let dw = abs(candidate.bounds.size.width - frame.size.width)
			let dh = abs(candidate.bounds.size.height - frame.size.height)
			score -= Double(dx + dy + dw + dh) / 20.0

			if let currentBest = best {
				if score > currentBest.score {
					best = (candidate, score)
				}
			} else {
				best = (candidate, score)
			}
		}

		return best?.candidate
	}

	private func displayScaleFactor(for frame: CGRect) -> Double {
		var displayCount: UInt32 = 0
		guard CGGetOnlineDisplayList(0, nil, &displayCount) == .success, displayCount > 0 else {
			return Double(NSScreen.main?.backingScaleFactor ?? 1.0)
		}

		var displays = Array(repeating: CGDirectDisplayID(), count: Int(displayCount))
		guard CGGetOnlineDisplayList(displayCount, &displays, &displayCount) == .success else {
			return Double(NSScreen.main?.backingScaleFactor ?? 1.0)
		}

		var chosenDisplay: CGDirectDisplayID?
		var chosenArea: CGFloat = -1
		for display in displays {
			let bounds = CGDisplayBounds(display)
			let overlap = bounds.intersection(frame)
			let area = overlap.isNull ? 0 : overlap.width * overlap.height
			if area > chosenArea {
				chosenArea = area
				chosenDisplay = display
			}
		}

		guard let display = chosenDisplay, let mode = CGDisplayCopyDisplayMode(display) else {
			return Double(NSScreen.main?.backingScaleFactor ?? 1.0)
		}

		let width = Double(mode.width)
		guard width > 0 else { return 1.0 }
		let scale = Double(mode.pixelWidth) / width
		return scale > 0 ? scale : 1.0
	}

	private func captureWindow(windowId: UInt32) throws -> [String: Any] {
#if PI_COMPUTER_USE_SCREEN_CAPTURE_KIT
		if #available(macOS 14.0, *) {
			let semaphore = DispatchSemaphore(value: 0)
			let capturedImage = Box<CGImage?>(nil)
			let capturedError = Box<Error?>(nil)

			let task = Task {
				defer { semaphore.signal() }
				do {
					if Task.isCancelled {
						return
					}
					let shareable = try await SCShareableContent.excludingDesktopWindows(false, onScreenWindowsOnly: false)
					guard let window = shareable.windows.first(where: { $0.windowID == windowId }) else {
						throw BridgeFailure(message: "Window \(windowId) is not available for capture", code: "window_not_found")
					}

					let filter = SCContentFilter(desktopIndependentWindow: window)
					let config = SCStreamConfiguration()
					config.showsCursor = false
					config.ignoreShadowsSingleWindow = true

					let image = try await SCScreenshotManager.captureImage(contentFilter: filter, configuration: config)
					capturedImage.value = image
				} catch {
					capturedError.value = error
				}
			}

			if semaphore.wait(timeout: .now() + .seconds(8)) == .timedOut {
				task.cancel()
				if let payload = try legacyWindowScreenshot(windowId: windowId) {
					return payload
				}
				throw BridgeFailure(message: "Screenshot timed out while capturing window \(windowId)", code: "screenshot_timeout")
			}

			if let error = capturedError.value {
				if let payload = try legacyWindowScreenshot(windowId: windowId) {
					return payload
				}
				if let failure = error as? BridgeFailure {
					throw failure
				}
				throw BridgeFailure(message: "Screenshot failed: \(error.localizedDescription)", code: "screenshot_failed")
			}

			guard let image = capturedImage.value else {
				if let payload = try legacyWindowScreenshot(windowId: windowId) {
					return payload
				}
				throw BridgeFailure(message: "Screenshot failed", code: "screenshot_failed")
			}

			return try screenshotPayload(image: image, windowId: windowId)
		}
#endif
		if let payload = try legacyWindowScreenshot(windowId: windowId) {
			return payload
		}
		throw BridgeFailure(message: "Screenshot failed", code: "screenshot_failed")
	}

	private func screenshotPayload(image: CGImage, windowId: UInt32) throws -> [String: Any] {
		guard let pngData = NSBitmapImageRep(cgImage: image).representation(using: .png, properties: [:]) else {
			throw BridgeFailure(message: "Failed to encode screenshot as PNG", code: "encoding_failed")
		}

		let bounds = currentWindowBounds(windowId: windowId)
		let scale = bounds.map { displayScaleFactor(for: $0) } ?? 1.0

		return [
			"pngBase64": pngData.base64EncodedString(),
			"width": image.width,
			"height": image.height,
			"scaleFactor": scale,
		]
	}

	private func legacyWindowScreenshot(windowId: UInt32) throws -> [String: Any]? {
		if let payload = try cgWindowScreenshot(windowId: windowId) {
			return payload
		}
		if let payload = try systemScreenshotWindow(windowId: windowId) {
			return payload
		}
		return nil
	}

	private func cgWindowScreenshot(windowId: UInt32) throws -> [String: Any]? {
		let options: CGWindowListOption = [.optionIncludingWindow]
		let imageOptions: CGWindowImageOption = [.boundsIgnoreFraming, .bestResolution]
		guard let image = CGWindowListCreateImage(.null, options, CGWindowID(windowId), imageOptions) else { return nil }
		guard image.width > 1, image.height > 1 else { return nil }
		return try screenshotPayload(image: image, windowId: windowId)
	}

	private func systemScreenshotWindow(windowId: UInt32) throws -> [String: Any]? {
		let tempUrl = FileManager.default.temporaryDirectory.appendingPathComponent("pi-cu-\(UUID().uuidString).png")
		defer { try? FileManager.default.removeItem(at: tempUrl) }

		let process = Process()
		process.executableURL = URL(fileURLWithPath: "/usr/sbin/screencapture")
		process.arguments = ["-x", "-l", String(windowId), tempUrl.path]
		try process.run()
		let deadline = Date().addingTimeInterval(5)
		while process.isRunning && Date() < deadline {
			Thread.sleep(forTimeInterval: 0.05)
		}
		if process.isRunning {
			process.terminate()
			Thread.sleep(forTimeInterval: 0.1)
			if process.isRunning { process.interrupt() }
			return nil
		}
		guard process.terminationStatus == 0 else { return nil }
		guard let data = try? Data(contentsOf: tempUrl), !data.isEmpty else { return nil }
		guard let imageRep = NSBitmapImageRep(data: data), let cgImage = imageRep.cgImage else { return nil }
		return try screenshotPayload(image: cgImage, windowId: windowId)
	}

	private func currentWindowBounds(windowId: UInt32) -> CGRect? {
#if PI_COMPUTER_USE_SCREEN_CAPTURE_KIT
		if #available(macOS 14.0, *), let scBounds = currentWindowBoundsViaScreenCaptureKit(windowId: windowId) {
			return scBounds
		}
#endif

		guard let descriptions = CGWindowListCreateDescriptionFromArray([NSNumber(value: windowId)] as CFArray) as? [[String: Any]],
			let first = descriptions.first,
			let boundsDict = first[kCGWindowBounds as String] as? [String: Any],
			let bounds = CGRect(dictionaryRepresentation: boundsDict as CFDictionary)
		else {
			return nil
		}
		return bounds
	}

#if PI_COMPUTER_USE_SCREEN_CAPTURE_KIT
	@available(macOS 14.0, *)
	private func currentWindowBoundsViaScreenCaptureKit(windowId: UInt32) -> CGRect? {
		let semaphore = DispatchSemaphore(value: 0)
		let output = Box<CGRect?>(nil)

		let task = Task {
			defer { semaphore.signal() }
			do {
				if Task.isCancelled {
					return
				}
				let shareable = try await SCShareableContent.excludingDesktopWindows(false, onScreenWindowsOnly: false)
				if let window = shareable.windows.first(where: { $0.windowID == windowId }) {
					output.value = window.frame
				}
			} catch {
				output.value = nil
			}
		}

		if semaphore.wait(timeout: .now() + .seconds(2)) == .timedOut {
			task.cancel()
			return nil
		}
		return output.value
	}
#endif

	private func mapWindowPoint(
		windowId: UInt32,
		x: Double,
		y: Double,
		captureWidth: Double,
		captureHeight: Double
	) throws -> CGPoint {
		guard let bounds = currentWindowBounds(windowId: windowId) else {
			throw BridgeFailure(message: "Target window is no longer available", code: "window_not_found")
		}

		let relX = min(max(x / captureWidth, 0), 1)
		let relY = min(max(y / captureHeight, 0), 1)
		let screenX = bounds.origin.x + bounds.size.width * relX
		let screenY = bounds.origin.y + bounds.size.height * relY
		return CGPoint(x: screenX, y: screenY)
	}

	private func postEvent(_ event: CGEvent, pid: Int32) {
		event.postToPid(pid)
	}

	private func postMouseMove(to point: CGPoint, pid: Int32) throws {
		guard let move = CGEvent(mouseEventSource: nil, mouseType: .mouseMoved, mouseCursorPosition: point, mouseButton: .left) else {
			throw BridgeFailure(message: "Failed to create mouse move event", code: "input_failed")
		}
		postEvent(move, pid: pid)
	}

	private func mouseButton(_ name: String) -> CGMouseButton {
		switch name.trimmingCharacters(in: .whitespacesAndNewlines).lowercased() {
		case "right":
			return .right
		case "middle", "center":
			return .center
		default:
			return .left
		}
	}

	private func mouseDownType(for button: CGMouseButton) -> CGEventType {
		switch button {
		case .right:
			return .rightMouseDown
		case .center:
			return .otherMouseDown
		default:
			return .leftMouseDown
		}
	}

	private func mouseUpType(for button: CGMouseButton) -> CGEventType {
		switch button {
		case .right:
			return .rightMouseUp
		case .center:
			return .otherMouseUp
		default:
			return .leftMouseUp
		}
	}

	private func mouseDraggedType(for button: CGMouseButton) -> CGEventType {
		switch button {
		case .right:
			return .rightMouseDragged
		case .center:
			return .otherMouseDragged
		default:
			return .leftMouseDragged
		}
	}

	private func postMouseClick(at point: CGPoint, pid: Int32, button: CGMouseButton = .left, clickCount: Int = 1) throws {
		try postMouseMove(to: point, pid: pid)
		for index in 1...max(1, clickCount) {
			guard let down = CGEvent(mouseEventSource: nil, mouseType: mouseDownType(for: button), mouseCursorPosition: point, mouseButton: button),
				let up = CGEvent(mouseEventSource: nil, mouseType: mouseUpType(for: button), mouseCursorPosition: point, mouseButton: button)
			else {
				throw BridgeFailure(message: "Failed to create mouse click event", code: "input_failed")
			}
			down.setIntegerValueField(.mouseEventClickState, value: Int64(index))
			up.setIntegerValueField(.mouseEventClickState, value: Int64(index))
			postEvent(down, pid: pid)
			usleep(12_000)
			postEvent(up, pid: pid)
			if index < clickCount {
				usleep(70_000)
			}
		}
	}

	private func postMouseDrag(points: [CGPoint], pid: Int32) throws {
		guard points.count >= 2, let first = points.first else {
			throw BridgeFailure(message: "Drag requires at least two points", code: "invalid_args")
		}
		try postMouseMove(to: first, pid: pid)
		guard let down = CGEvent(mouseEventSource: nil, mouseType: .leftMouseDown, mouseCursorPosition: first, mouseButton: .left) else {
			throw BridgeFailure(message: "Failed to create mouse down event", code: "input_failed")
		}
		postEvent(down, pid: pid)
		usleep(12_000)

		for point in points.dropFirst() {
			guard let drag = CGEvent(mouseEventSource: nil, mouseType: mouseDraggedType(for: .left), mouseCursorPosition: point, mouseButton: .left) else {
				throw BridgeFailure(message: "Failed to create mouse drag event", code: "input_failed")
			}
			postEvent(drag, pid: pid)
			usleep(8_000)
		}

		guard let last = points.last,
			let up = CGEvent(mouseEventSource: nil, mouseType: .leftMouseUp, mouseCursorPosition: last, mouseButton: .left)
		else {
			throw BridgeFailure(message: "Failed to create mouse up event", code: "input_failed")
		}
		postEvent(up, pid: pid)
	}

	private func postScrollWheel(at point: CGPoint, deltaX: Int, deltaY: Int, pid: Int32) throws {
		try postMouseMove(to: point, pid: pid)
		guard let event = CGEvent(
			scrollWheelEvent2Source: nil,
			units: .pixel,
			wheelCount: 2,
			wheel1: Int32(-deltaY),
			wheel2: Int32(deltaX),
			wheel3: 0
		) else {
			throw BridgeFailure(message: "Failed to create scroll event", code: "input_failed")
		}
		event.location = point
		postEvent(event, pid: pid)
	}

	private func modifierFlag(_ key: String) -> CGEventFlags? {
		switch key.trimmingCharacters(in: .whitespacesAndNewlines).lowercased() {
		case "cmd", "command", "meta":
			return .maskCommand
		case "ctrl", "control":
			return .maskControl
		case "shift":
			return .maskShift
		case "option", "alt":
			return .maskAlternate
		default:
			return nil
		}
	}

	private func keyCode(_ key: String) -> CGKeyCode? {
		let normalized = key.trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
		let table: [String: CGKeyCode] = [
			"a": 0, "s": 1, "d": 2, "f": 3, "h": 4, "g": 5, "z": 6, "x": 7, "c": 8, "v": 9, "b": 11,
			"q": 12, "w": 13, "e": 14, "r": 15, "y": 16, "t": 17, "1": 18, "2": 19, "3": 20, "4": 21,
			"6": 22, "5": 23, "=": 24, "+": 24, "9": 25, "7": 26, "-": 27, "8": 28, "0": 29,
			"]": 30, "o": 31, "u": 32, "[": 33, "i": 34, "p": 35, "return": 36, "enter": 36,
			"l": 37, "j": 38, "'": 39, "\"": 39, "k": 40, ";": 41, "\\": 42, ",": 43, "/": 44,
			"n": 45, "m": 46, ".": 47, "tab": 48, "space": 49, " ": 49, "`": 50, "~": 50,
			"backspace": 51, "delete": 51, "del": 51, "esc": 53, "escape": 53,
			"f1": 122, "f2": 120, "f3": 99, "f4": 118, "f5": 96, "f6": 97, "f7": 98, "f8": 100,
			"f9": 101, "f10": 109, "f11": 103, "f12": 111,
			"home": 115, "pageup": 116, "page_up": 116, "page down": 121, "pagedown": 121, "page_down": 121,
			"forwarddelete": 117, "forward_delete": 117, "end": 119,
			"left": 123, "arrowleft": 123, "arrow_left": 123,
			"right": 124, "arrowright": 124, "arrow_right": 124,
			"down": 125, "arrowdown": 125, "arrow_down": 125,
			"up": 126, "arrowup": 126, "arrow_up": 126,
		]
		return table[normalized]
	}

	private func keyChord(_ keys: [String]) -> (flags: CGEventFlags, key: String)? {
		guard keys.count >= 2 else { return nil }
		var flags = CGEventFlags()
		for key in keys.dropLast() {
			guard let flag = modifierFlag(key) else {
				return nil
			}
			flags.insert(flag)
		}
		return (flags, keys.last ?? "")
	}

	private func postKeyPress(keys: [String], pid: Int32) throws {
		if let chord = keyChord(keys) {
			try postKey(chord.key, flags: chord.flags, pid: pid)
			return
		}

		for key in keys {
			let parts = key
				.split(separator: "+")
				.map { String($0).trimmingCharacters(in: .whitespacesAndNewlines) }
				.filter { !$0.isEmpty }
			if let chord = keyChord(parts) {
				try postKey(chord.key, flags: chord.flags, pid: pid)
			} else {
				try postKey(key, flags: [], pid: pid)
			}
		}
	}

	private func postKey(_ key: String, flags: CGEventFlags, pid: Int32) throws {
		guard let code = keyCode(key) else {
			if key.count == 1 {
				try postUnicodeText(key, pid: pid)
				return
			}
			throw BridgeFailure(message: "Unsupported key '\(key)'", code: "invalid_args")
		}
		guard let down = CGEvent(keyboardEventSource: nil, virtualKey: code, keyDown: true),
			let up = CGEvent(keyboardEventSource: nil, virtualKey: code, keyDown: false)
		else {
			throw BridgeFailure(message: "Failed to create key event", code: "input_failed")
		}
		down.flags = flags
		up.flags = flags
		postEvent(down, pid: pid)
		usleep(8_000)
		postEvent(up, pid: pid)
	}

	private func postUnicodeText(_ text: String, pid: Int32) throws {
		for scalar in text.unicodeScalars {
			let char = String(scalar)
			guard let down = CGEvent(keyboardEventSource: nil, virtualKey: 0, keyDown: true),
				let up = CGEvent(keyboardEventSource: nil, virtualKey: 0, keyDown: false)
			else {
				throw BridgeFailure(message: "Failed to create unicode key event", code: "input_failed")
			}
			setUnicodeString(event: down, text: char)
			setUnicodeString(event: up, text: char)
			postEvent(down, pid: pid)
			usleep(8_000)
			postEvent(up, pid: pid)
		}
	}

	private func setUnicodeString(event: CGEvent, text: String) {
		var utf16 = Array(text.utf16)
		utf16.withUnsafeMutableBufferPointer { buffer in
			guard let base = buffer.baseAddress else { return }
			event.keyboardSetUnicodeString(stringLength: buffer.count, unicodeString: base)
		}
	}

}

_ = NSApplication.shared
NSApp.setActivationPolicy(.prohibited)

let bridge = Bridge()
bridge.run()