import { existsSync, mkdirSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { afterEach, beforeEach, describe, expect, it } from "vitest";
import { boxUploadsDir, planBox } from "./bot-box/plan.ts";
import { attachmentsForBox } from "./box-attachments.ts";

describe("attachmentsForBox", () => {
  let root: string, dataDir: string, uploads: string, cwd: string, shown: string;
  beforeEach(() => {
    root = mkdtempSync(join(tmpdir(), "box-attachments-"));
    dataDir = join(root, "data");
    uploads = join(dataDir, "attachments");
    cwd = join(dataDir, "task-workspaces", "bot", "thread");
    shown = boxUploadsDir(dataDir, "bot", "thread");
    mkdirSync(uploads, { recursive: true });
    mkdirSync(cwd, { recursive: true });
  });
  afterEach(() => rmSync(root, { recursive: true, force: true }));
  const run = (text: string, at: string | undefined = cwd, boxed = true) => attachmentsForBox(text, at, boxed, dataDir, uploads);

  it("puts each upload in the conversation's read-only uploads folder and points the engine there", () => {
    const upload = join(uploads, "1f0c2a.md");
    writeFileSync(upload, "# notes\n");
    writeFileSync(join(uploads, "9b7e.png"), "png");
    const text = `Read this\n<attached-file path="${upload}" name="notes.md" />\n<attached-image path="${join(uploads, "9b7e.png")}" name="shot.png" />`;

    const out = run(text);

    expect(out).toBe(`Read this\n<attached-file path="${join(shown, "1f0c2a.md")}" name="notes.md" />\n<attached-image path="${join(shown, "9b7e.png")}" name="shot.png" />`);
    expect(readFileSync(join(shown, "1f0c2a.md"), "utf8")).toBe("# notes\n");
    // Nothing is written into the working folder, which the bot controls.
    expect(existsSync(join(cwd, ".attachments"))).toBe(false);
    expect(run(text)).toBe(out);
  });

  it("finds an upload whose path the tag escaped", () => {
    const dir = join(root, "a&b", "attachments");
    mkdirSync(dir, { recursive: true });
    writeFileSync(join(dir, "x.md"), "x");
    const out = attachmentsForBox(`<attached-file path="${join(root, "a&amp;b", "attachments", "x.md")}" name="x.md" />`, cwd, true, dataDir, dir);
    expect(out).toBe(`<attached-file path="${join(shown, "x.md")}" name="x.md" />`);
  });

  it("does not point at an upload that was deleted, even if an earlier turn linked it", () => {
    const upload = join(uploads, "gone.md");
    writeFileSync(upload, "x");
    const text = `<attached-file path="${upload}" name="g.md" />`;
    expect(run(text)).not.toBe(text);
    rmSync(upload);
    expect(run(text)).toBe(text);
  });

  it("changes nothing with the box off, without a working folder, or outside a conversation's own folder", () => {
    const upload = join(uploads, "a.md");
    writeFileSync(upload, "x");
    const text = `<attached-file path="${upload}" name="a.md" />`;
    expect(run(text, cwd, false)).toBe(text);
    expect(attachmentsForBox(text, undefined, true, dataDir, uploads)).toBe(text);
    expect(run(text, join(dataDir, "workspaces", "bot"))).toBe(text);
    expect(existsSync(shown)).toBe(false);
  });

  it("leaves paths outside the uploads folder, odd names and missing files as they are", () => {
    writeFileSync(join(root, "elsewhere.md"), "x");
    writeFileSync(join(dataDir, "secret.md"), "x");
    const text = [
      `<attached-file path="${join(root, "elsewhere.md")}" name="e.md" />`,
      `<attached-file path="${uploads}/../secret.md" name="s.md" />`,
      `<attached-file path="${join(uploads, "missing.md")}" name="m.md" />`,
      `<attached-file path="${join(uploads, ".openmaus-upload-x.partial")}" name="p" />`,
    ].join("\n");
    expect(run(text)).toBe(text);
  });

  it("is bound read-only into that conversation's boxes only, after its working folder", () => {
    const setup = { dataDir, home: root, codeRoots: [], engineRoots: [], bridges: [] };
    const targets = (at: string) => planBox(setup, { command: "/usr/bin/true", args: [], cwd: at, env: {} }).mounts.map((mount) => ("target" in mount ? mount.target : null));
    const plan = planBox(setup, { command: "/usr/bin/true", args: [], cwd, env: {} });
    const at = targets(cwd).indexOf(shown);
    expect(plan.mounts[at]).toEqual({ kind: "ro", source: shown, target: shown, optional: true });
    expect(at).toBeGreaterThan(targets(cwd).indexOf(cwd));
    expect(targets(join(dataDir, "task-workspaces", "bot", "other"))).not.toContain(shown);
  });
});