import { access, appendFile, mkdir, readFile, writeFile } from "node:fs/promises";
import { join } from "node:path";
import { afterAll, beforeAll, describe, expect, it } from "vitest";
import {
  createFmHarness,
  EXEC_KEY,
  type FmHarness,
  key,
  pgAvailable,
  READ_KEY,
  seedAsset,
  seedBinding,
  seedDownload,
  seedEntity,
} from "./harness.ts";

// 写接口:mkdir / rename(不覆盖、同步 asset_location + sidecar、目录改名写 path_binding 修订、做种 409)、
// move/copy 的 dryRun→execute 一致性与源变更拒绝、planId 与请求不符、幂等重放。

const skip = !(await pgAvailable());
const exists = (p: string) =>
  access(p).then(
    () => true,
    () => false,
  );

describe.skipIf(skip)("files 写操作", () => {
  let h: FmHarness;
  let entity: string;
  beforeAll(async () => {
    h = await createFmHarness("write");
    entity = await seedEntity(h.db, { kind: "movie", title: "Movie", year: 2020 });
  });
  afterAll(async () => h?.close());

  it("mkdir:非递归、已存在 409、非法名 400、只读 scope 403、下载根不可写", async () => {
    const ok = await h.api("POST", "/files/mkdir", {
      idempotencyKey: key(),
      root: h.libRoot,
      path: "",
      name: "新目录",
    });
    expect(ok.status).toBe(200);
    expect(await exists(join(h.lib, "新目录"))).toBe(true);
    const dup = await h.api("POST", "/files/mkdir", {
      idempotencyKey: key(),
      root: h.libRoot,
      path: "",
      name: "新目录",
    });
    expect(dup.status).toBe(409);
    const bad = await h.api("POST", "/files/mkdir", { idempotencyKey: key(), root: h.libRoot, path: "", name: "a/b" });
    expect(bad.status).toBeGreaterThanOrEqual(400);
    const trailing = await h.api("POST", "/files/mkdir", {
      idempotencyKey: key(),
      root: h.libRoot,
      path: "",
      name: "x.",
    });
    expect(trailing.status).toBe(400);
    const ro = await h.api(
      "POST",
      "/files/mkdir",
      { idempotencyKey: key(), root: h.libRoot, path: "", name: "y" },
      READ_KEY,
    );
    expect(ro.status).toBe(403);
    const dl = await h.api("POST", "/files/mkdir", { idempotencyKey: key(), root: h.dlRoot, path: "", name: "y" });
    expect(dl.status).toBe(403);
    const audit = await h.db.selectFrom("audit_event").select(["action"]).where("action", "=", "files.mkdir").execute();
    expect(audit).toHaveLength(1);
  });

  it("rename 文件:sidecar 一起改,asset_location 同步,同名存在 409 且原文件不动", async () => {
    const dir = join(h.lib, "Movie (2020)");
    await mkdir(dir);
    await writeFile(join(dir, "Movie.2020.mkv"), "video");
    await writeFile(join(dir, "Movie.2020.chs.srt"), "sub");
    await writeFile(join(dir, "Taken.mkv"), "other");
    const main = await seedAsset(h.db, h, { entityId: entity, rel: "Movie (2020)/Movie.2020.mkv" });
    const sub = await seedAsset(h.db, h, {
      entityId: entity,
      rel: "Movie (2020)/Movie.2020.chs.srt",
      kind: "subtitle",
      sidecarOf: main.locationId,
    });

    const clash = await h.api("POST", "/files/rename", {
      idempotencyKey: key(),
      root: h.libRoot,
      path: "Movie (2020)/Movie.2020.mkv",
      newName: "Taken.mkv",
    });
    expect(clash.status).toBe(409);
    expect(await readFile(join(dir, "Movie.2020.mkv"), "utf8")).toBe("video");
    expect(await readFile(join(dir, "Taken.mkv"), "utf8")).toBe("other");

    const preview = await h.api("POST", "/files/rename", {
      idempotencyKey: key(),
      root: h.libRoot,
      path: "Movie (2020)/Movie.2020.mkv",
      newName: "Movie (2020) 1080p.mkv",
      dryRun: true,
    });
    expect(preview.status).toBe(200);
    expect(preview.body.data.renames).toEqual([
      { from: "Movie (2020)/Movie.2020.mkv", to: "Movie (2020)/Movie (2020) 1080p.mkv", role: "main" },
      { from: "Movie (2020)/Movie.2020.chs.srt", to: "Movie (2020)/Movie (2020) 1080p.chs.srt", role: "sidecar" },
    ]);
    expect(preview.body.data.assetLocations).toBe(2);
    expect(await exists(join(dir, "Movie.2020.mkv"))).toBe(true);

    const r = await h.api("POST", "/files/rename", {
      idempotencyKey: key(),
      root: h.libRoot,
      path: "Movie (2020)/Movie.2020.mkv",
      newName: "Movie (2020) 1080p.mkv",
    });
    expect(r.status).toBe(200);
    expect(r.body.data.assetLocations).toBe(2);
    expect(r.body.data.recordId).toBeTruthy();
    expect(await exists(join(dir, "Movie (2020) 1080p.mkv"))).toBe(true);
    expect(await exists(join(dir, "Movie (2020) 1080p.chs.srt"))).toBe(true);
    const locs = await h.db
      .selectFrom("asset_location")
      .select(["id", "relative_path"])
      .where("id", "in", [main.locationId, sub.locationId])
      .execute();
    expect(Object.fromEntries(locs.map((l) => [l.id, l.relative_path]))).toEqual({
      [main.locationId]: "Movie (2020)/Movie (2020) 1080p.mkv",
      [sub.locationId]: "Movie (2020)/Movie (2020) 1080p.chs.srt",
    });
    const rec = await h.db
      .selectFrom("organization_record")
      .select(["action", "status", "media_entity_id"])
      .where("id", "=", r.body.data.recordId)
      .executeTakeFirstOrThrow();
    expect(rec).toMatchObject({ action: "rename", status: "succeeded", media_entity_id: entity });
    const ops = await h.db.selectFrom("asset_operation").select(["kind"]).where("kind", "=", "rename").execute();
    expect(ops.length).toBe(2);
    expect(h.events.some((e) => e.type === "files.changed")).toBe(true);
  });

  it("rename 目录命中绑定:旧绑定 superseded 且链接到新绑定,目录下位置前缀替换", async () => {
    const bindingId = await seedBinding(h.db, h, { entityId: entity, rel: "Movie (2020)" });
    const r = await h.api("POST", "/files/rename", {
      idempotencyKey: key(),
      root: h.libRoot,
      path: "Movie (2020)",
      newName: "Movie 2020 Collection",
    });
    expect(r.status).toBe(200);
    expect(r.body.data.bindings).toHaveLength(1);
    const old = await h.db.selectFrom("path_binding").selectAll().where("id", "=", bindingId).executeTakeFirstOrThrow();
    expect(old.status).toBe("superseded");
    const nb = await h.db
      .selectFrom("path_binding")
      .selectAll()
      .where("id", "=", old.superseded_by_id!)
      .executeTakeFirstOrThrow();
    expect(nb).toMatchObject({ status: "active", relative_path: "Movie 2020 Collection", media_entity_id: entity });
    expect(nb.bound_by).toContain("dev_admin");
    const locs = await h.db
      .selectFrom("asset_location")
      .select(["relative_path"])
      .where("library_root_id", "=", h.libraryRootId)
      .execute();
    expect(locs.map((l) => l.relative_path).sort()).toEqual([
      "Movie 2020 Collection/Movie (2020) 1080p.chs.srt",
      "Movie 2020 Collection/Movie (2020) 1080p.mkv",
    ]);
  });

  it("rename:纳管做种目录 409;根本身 400", async () => {
    await mkdir(join(h.dl, "Seeding.Pack"));
    await writeFile(join(h.dl, "Seeding.Pack", "a.mkv"), "a");
    await seedDownload(h.db, h, { name: "Seeding.Pack", status: "completed" });
    const r = await h.api("POST", "/files/rename", {
      idempotencyKey: key(),
      root: h.dlRoot,
      path: "Seeding.Pack",
      newName: "Renamed.Pack",
    });
    expect(r.status).toBe(409);
    expect(r.body.error.message).toMatch(/^download_active:/);
    expect(await exists(join(h.dl, "Seeding.Pack"))).toBe(true);
    const root = await h.api("POST", "/files/rename", {
      idempotencyKey: key(),
      root: h.libRoot,
      path: "",
      newName: "x",
    });
    expect(root.status).toBe(400);
  });

  it("move:dryRun → execute 一致;源变更 → plan_stale;请求与 planId 不符 → plan_stale;幂等重放不重复执行", async () => {
    await mkdir(join(h.lib, "inbox"));
    await writeFile(join(h.dl, "Loose.File.2019.mkv"), "loose-v1");
    const body = {
      items: [{ root: h.dlRoot, path: "Loose.File.2019.mkv" }],
      target: { root: h.libRoot, path: "inbox" },
      mode: "move",
    };
    const dry = await h.api("POST", "/files/move", { ...body, idempotencyKey: key(), dryRun: true });
    expect(dry.status).toBe(200);
    expect(dry.body.data.pairs).toEqual([
      {
        source: { root: h.dlRoot, path: "Loose.File.2019.mkv" },
        target: { root: h.libRoot, path: "inbox/Loose.File.2019.mkv" },
        size: 8,
        conflict: false,
        registered: false,
        files: 1,
        crossDevice: false,
      },
    ]);
    const planId = dry.body.data.planId;

    // 执行必须带 planId
    const noPlan = await h.api("POST", "/files/move", { ...body, idempotencyKey: key(), dryRun: false });
    expect(noPlan.status).toBe(400);
    // planId 与请求不符(换了目标)
    await mkdir(join(h.lib, "other"));
    const mismatch = await h.api("POST", "/files/move", {
      ...body,
      target: { root: h.libRoot, path: "other" },
      idempotencyKey: key(),
      dryRun: false,
      planId,
    });
    expect(mismatch.status).toBe(409);
    expect(mismatch.body.error.message).toMatch(/^plan_stale:/);

    // 源在预览后变化
    await appendFile(join(h.dl, "Loose.File.2019.mkv"), "-changed");
    const stale = await h.api("POST", "/files/move", { ...body, idempotencyKey: key(), dryRun: false, planId });
    expect(stale.status).toBe(409);
    expect(stale.body.error.message).toMatch(/^plan_stale:/);
    expect(await exists(join(h.dl, "Loose.File.2019.mkv"))).toBe(true);

    // 重新预览后执行;同一幂等键重放返回首次结果
    const dry2 = await h.api("POST", "/files/move", { ...body, idempotencyKey: key(), dryRun: true });
    const k = key();
    const exec = await h.api("POST", "/files/move", {
      ...body,
      idempotencyKey: k,
      dryRun: false,
      planId: dry2.body.data.planId,
    });
    expect(exec.status).toBe(200);
    expect(exec.body.data.executed.succeeded).toEqual(["Loose.File.2019.mkv"]);
    expect(exec.body.data.pairs).toEqual(dry2.body.data.pairs);
    expect(await readFile(join(h.lib, "inbox", "Loose.File.2019.mkv"), "utf8")).toBe("loose-v1-changed");
    expect(await exists(join(h.dl, "Loose.File.2019.mkv"))).toBe(false);
    const replay = await h.api("POST", "/files/move", {
      ...body,
      idempotencyKey: k,
      dryRun: false,
      planId: dry2.body.data.planId,
    });
    expect(replay.status).toBe(200);
    expect(replay.body.data).toEqual(exec.body.data);
    // 用过的 planId 不能再执行
    const again = await h.api("POST", "/files/move", {
      ...body,
      idempotencyKey: key(),
      dryRun: false,
      planId: dry2.body.data.planId,
    });
    expect(again.status).toBeGreaterThanOrEqual(400);
    const rec = await h.db
      .selectFrom("organization_record")
      .select(["action", "status"])
      .where("id", "=", exec.body.data.executed.recordId)
      .executeTakeFirstOrThrow();
    // W5-A2:搬运走 planImport → verifyAndImport,记录 action 与整理一致(move/copy)
    expect(rec).toEqual({ action: "move", status: "succeeded" });
  });

  it("TOCTOU:预览后把源换成指向根外的符号链接,执行被拒绝且根外文件不动", async () => {
    const { rm, symlink } = await import("node:fs/promises");
    await writeFile(join(h.dl, "Swap.mkv"), "swap");
    const body = {
      items: [{ root: h.dlRoot, path: "Swap.mkv" }],
      target: { root: h.libRoot, path: "inbox" },
      mode: "move",
    };
    const dry = await h.api("POST", "/files/move", { ...body, idempotencyKey: key(), dryRun: true });
    await rm(join(h.dl, "Swap.mkv"));
    await symlink(join(h.outside, "secret.txt"), join(h.dl, "Swap.mkv"));
    const r = await h.api("POST", "/files/move", {
      ...body,
      idempotencyKey: key(),
      dryRun: false,
      planId: dry.body.data.planId,
    });
    expect(r.status).toBe(400);
    expect(r.body.error.message).toMatch(/^path_escape:/);
    expect(await readFile(join(h.outside, "secret.txt"), "utf8")).toBe("top secret\n");
    expect(await exists(join(h.lib, "inbox", "Swap.mkv"))).toBe(false);
  });

  it("move 已登记资产:asset_location 跟随;API Key 无授权 → 403;copy 不删源", async () => {
    await mkdir(join(h.lib, "A"));
    await mkdir(join(h.lib, "B"));
    await writeFile(join(h.lib, "A", "Reg.2018.mkv"), "reg");
    const a = await seedAsset(h.db, h, { entityId: entity, rel: "A/Reg.2018.mkv" });
    const body = {
      items: [{ root: h.libRoot, path: "A/Reg.2018.mkv" }],
      target: { root: h.libRoot, path: "B" },
      mode: "move",
    };
    const dry = await h.api("POST", "/files/move", { ...body, idempotencyKey: key(), dryRun: true }, EXEC_KEY);
    expect(dry.body.data.pairs[0].registered).toBe(true);
    const denied = await h.api(
      "POST",
      "/files/move",
      { ...body, idempotencyKey: key(), dryRun: false, planId: dry.body.data.planId },
      EXEC_KEY,
    );
    expect(denied.status).toBe(403);
    const dry2 = await h.api("POST", "/files/move", { ...body, idempotencyKey: key(), dryRun: true });
    const ok = await h.api("POST", "/files/move", {
      ...body,
      idempotencyKey: key(),
      dryRun: false,
      planId: dry2.body.data.planId,
    });
    expect(ok.status).toBe(200);
    const loc = await h.db
      .selectFrom("asset_location")
      .select(["relative_path"])
      .where("id", "=", a.locationId)
      .executeTakeFirstOrThrow();
    expect(loc.relative_path).toBe("B/Reg.2018.mkv");

    await writeFile(join(h.dl, "CopyMe.mkv"), "copy");
    const cbody = { items: [{ root: h.dlRoot, path: "CopyMe.mkv" }], target: { root: h.libRoot, path: "A" } };
    const cdry = await h.api("POST", "/files/copy", { ...cbody, idempotencyKey: key(), dryRun: true }, EXEC_KEY);
    expect(cdry.status).toBe(200);
    const cexec = await h.api(
      "POST",
      "/files/copy",
      { ...cbody, idempotencyKey: key(), dryRun: false, planId: cdry.body.data.planId },
      EXEC_KEY,
    );
    expect(cexec.status).toBe(200);
    expect(await readFile(join(h.lib, "A", "CopyMe.mkv"), "utf8")).toBe("copy");
    expect(await exists(join(h.dl, "CopyMe.mkv"))).toBe(true);
  });
});