"""Optional dispatch gates for ``butler.tools.registry`` (P0-A)."""

from __future__ import annotations

import json
from pathlib import Path
from typing import Any, Callable, cast

from butler.core.best_effort import safe_best_effort
from butler.core.preread_context import build_preread_block, inject_preread_into_args
from butler.core.session_recall_intent import check_session_read_recall_tool_block
from butler.core.tool_error_policy import apply_tool_error_policy
from butler.execution_context import get_current_orchestrator, get_current_session_key
from butler.hooks.runner import (
    run_permission_denied_hooks,
    run_permission_request_hooks,
    run_post_tool_hooks,
    run_pre_tool_hooks,
)
from butler.mcp.config import mcp_enabled
from butler.mcp.registry_hook import (
    check_plan_mode_mcp_block,
    get_mcp_tool_definitions,
    is_mcp_tool,
)
from butler.tools.network_search_policy import (
    check_network_search_tool_block,
    note_web_search_outcome as _note_web_search_outcome_impl,
    record_network_search_tool,
)
from butler.tools.registry_invoke_ops import (
    invoke_registered_tool_handler as _invoke_registered_tool_handler,
)
from butler.tools.tool_arg_normalize import normalize_tool_args, validate_tool_args
from butler.tools.toolset_profiles import filter_definitions_by_toolset as _filter_by_toolset


def mcp_tools_enabled() -> bool:
    def _run() -> bool:
        return bool(mcp_enabled())

    result = safe_best_effort(
        _run,
        label="registry.mcp_enabled",
        default=False,
    )
    return bool(result)


def extend_mcp_definitions(definitions: list[dict[str, Any]]) -> list[dict[str, Any]]:
    def _run() -> list[dict[str, Any]]:
        return [*definitions, *get_mcp_tool_definitions()]

    result = safe_best_effort(
        _run,
        label="registry.mcp_tool_definitions",
        default=None,
    )
    return definitions if result is None else result


def filter_definitions_by_toolset(definitions: list[dict[str, Any]]) -> list[dict[str, Any]]:
    def _run() -> list[dict[str, Any]]:
        return cast(list[dict[str, Any]], _filter_by_toolset(definitions))

    result = safe_best_effort(
        _run,
        label="registry.toolset_filter",
        default=None,
    )
    return definitions if result is None else result


def plan_mode_mcp_block(name: str) -> str | None:
    def _run() -> str | None:
        return cast(str | None, check_plan_mode_mcp_block(name))

    return cast(
        str | None,
        safe_best_effort(
            _run,
            label="registry.mcp_plan_mode",
            default=None,
        ),
    )


def project_permission_block(name: str, args: dict[str, Any]) -> str | None:
    def _run() -> str | None:
        from butler.permissions import check_project_permission_block

        return cast(str | None, check_project_permission_block(name, args))

    return cast(
        str | None,
        safe_best_effort(
            _run,
            label="registry.project_permission",
            default=None,
        ),
    )


def pre_tool_hooks_block(name: str, args: dict[str, Any]) -> str | None:
    def _run() -> str | None:
        return cast(str | None, run_pre_tool_hooks(name, args))

    return cast(
        str | None,
        safe_best_effort(
            _run,
            label="registry.pre_tool_hooks",
            default=None,
        ),
    )


def network_search_gate(
    name: str,
    args: dict[str, Any],
    *,
    finalize: Callable[..., str],
    started_at: float,
) -> str | None:
    def _run() -> str | None:
        block = check_network_search_tool_block(name, args if isinstance(args, dict) else {})
        if block:
            return finalize(name, args, block, started_at=started_at)
        record_network_search_tool(name)
        return None

    return cast(
        str | None,
        safe_best_effort(
            _run,
            label="registry.network_search_policy",
            default=None,
        ),
    )


def dispatch_mcp_if_applicable(
    name: str,
    args: dict[str, Any],
    *,
    dispatch_mcp: Callable[..., str],
) -> str | None:
    def _run() -> str | None:
        if is_mcp_tool(name):
            return dispatch_mcp(name, args)
        return None

    return cast(
        str | None,
        safe_best_effort(
            _run,
            label="registry.mcp_dispatch_route",
            default=None,
        ),
    )


def session_read_recall_block(name: str) -> str | None:
    def _run() -> str | None:
        return cast(str | None, check_session_read_recall_tool_block(name))

    return cast(
        str | None,
        safe_best_effort(
            _run,
            label="registry.session_read_recall",
            default=None,
        ),
    )


def permission_request_hooks_block(name: str, args: dict[str, Any]) -> str | None:
    def _run() -> str | None:
        sk = str(get_current_session_key() or "").strip()
        return cast(str | None, run_permission_request_hooks(name, args, session_key=sk))

    return cast(
        str | None,
        safe_best_effort(
            _run,
            label="registry.permission_request_hooks",
            default=None,
        ),
    )


def normalize_and_validate_args(
    name: str,
    args: dict[str, Any],
) -> tuple[dict[str, Any], dict[str, Any] | None]:
    def _run() -> tuple[dict[str, Any], dict[str, Any] | None]:
        call_args = normalize_tool_args(name, dict(args))
        arg_err = validate_tool_args(name, call_args)
        return call_args, arg_err

    result = safe_best_effort(
        _run,
        label="registry.tool_arg_normalize",
        default=None,
    )
    if result is None:
        return dict(args), None
    return cast(tuple[dict[str, Any], dict[str, Any] | None], result)


def inject_read_file_preread(name: str, call_args: dict[str, Any]) -> dict[str, Any]:
    if name != "read_file":
        return call_args

    def _run() -> dict[str, Any]:
        orch = get_current_orchestrator()
        ws = None
        if orch is not None:
            proj = orch.project_manager.get_current()
            if proj is not None:
                ws = Path(proj.workspace)
        block = build_preread_block(ws, str(call_args.get("path") or ""))
        if block:
            return cast(dict[str, Any], inject_preread_into_args(call_args, block))
        return call_args

    result = safe_best_effort(
        _run,
        label="registry.read_file_preread",
        default=None,
    )
    return call_args if result is None else result


def note_web_search_outcome(result: Any) -> None:
    safe_best_effort(
        lambda: _note_web_search_outcome_impl(result),
        label="registry.web_search_outcome",
        default=None,
    )


def permission_denied_hint(name: str, args: dict[str, Any], reason: str) -> str | None:
    def _run() -> str | None:
        return cast(str | None, run_permission_denied_hooks(name, args, reason))

    return cast(
        str | None,
        safe_best_effort(
            _run,
            label="registry.permission_denied_hooks",
            default=None,
        ),
    )


def apply_post_tool_hooks(
    name: str,
    args: dict[str, Any],
    finalized: str,
    *,
    failed: bool = False,
) -> str:
    hook_failed = failed
    try:
        payload = json.loads(finalized)
        if not hook_failed and isinstance(payload, dict):
            hook_failed = (
                payload.get("ok") is False
                or "error" in payload
                or payload.get("success") is False
            )
    except (TypeError, ValueError, json.JSONDecodeError):
        if not hook_failed:
            hook_failed = '"error"' in finalized

    def _run() -> str:
        return cast(str, run_post_tool_hooks(name, args, finalized, failed=hook_failed))

    result = safe_best_effort(
        _run,
        label="registry.post_tool_hooks",
        default=None,
    )
    return finalized if result is None else result


def invoke_registered_tool_handler(
    *,
    name: str,
    args: dict[str, Any],
    call_args: dict[str, Any],
    handler: Callable[..., Any],
    started_at: float,
    finalize_result: Callable[..., str],
    apply_hooks: Callable[..., str],
) -> str:
    return cast(
        str,
        _invoke_registered_tool_handler(
            name=name,
            args=args,
            call_args=call_args,
            handler=handler,
            started_at=started_at,
            finalize_result=finalize_result,
            apply_hooks=apply_hooks,
        ),
    )


def tool_error_payload(name: str, exc: BaseException) -> dict[str, Any]:
    def _run() -> dict[str, Any]:
        raw = apply_tool_error_policy(
            "",
            tool_name=name,
            exc=exc,
        )
        if raw.strip().startswith("{"):
            parsed = json.loads(raw)
            if isinstance(parsed, dict):
                return cast(dict[str, Any], parsed)
        return {"error": raw}

    result = safe_best_effort(
        _run,
        label="registry.tool_error_policy",
        default=None,
    )
    if isinstance(result, dict):
        return cast(dict[str, Any], result)
    return {"error": f"Tool '{name}' failed: {exc}"}


__all__ = [
    "apply_post_tool_hooks",
    "dispatch_mcp_if_applicable",
    "extend_mcp_definitions",
    "filter_definitions_by_toolset",
    "inject_read_file_preread",
    "invoke_registered_tool_handler",
    "mcp_tools_enabled",
    "network_search_gate",
    "normalize_and_validate_args",
    "note_web_search_outcome",
    "permission_denied_hint",
    "permission_request_hooks_block",
    "plan_mode_mcp_block",
    "pre_tool_hooks_block",
    "project_permission_block",
    "session_read_recall_block",
    "tool_error_payload",
]