import { randomUUID } from "node:crypto";
import { mkdir, rename, stat, writeFile } from "node:fs/promises";
import { join } from "node:path";
import { createQbClient } from "@umt/adapters";
import type { OrganizeSourceConfig } from "@umt/contracts";
import { createMockQb, type MockQb } from "@umt/testkit";
import { afterEach, describe, expect, it } from "vitest";
import {
  deleteOrganizeSource,
  listOrganizeSources,
  saveOrganizeSource,
} from "../../src/modules/file-manager/organize-sources.ts";
import { advanceSnapshot, scanOrganizeSource, scanStock } from "../../src/modules/file-manager/source-monitor.ts";
import { createFmHarness, type FmHarness, pgAvailable, seedDownload, seedEntity } from "./harness.ts";

const fact = { size: 100, mtimeMs: 1000 };
describe("source snapshot observations", () => {
  it("baselines historical files and requires two stable observations for new and changed files", () => {
    const baseline = advanceSnapshot(null, { "old.mkv": fact });
    expect(baseline.eligible).toEqual([]);
    const added = advanceSnapshot(baseline.snapshot, { "old.mkv": fact, "new.mkv": fact });
    expect(added.eligible).toEqual([]);
    const stable = advanceSnapshot(added.snapshot, { "old.mkv": fact, "new.mkv": fact });
    expect(stable.eligible).toEqual(["new.mkv"]);
    const changed = advanceSnapshot(stable.snapshot, { "old.mkv": { ...fact, size: 200 }, "new.mkv": fact });
    expect(changed.eligible).not.toContain("old.mkv");
    expect(advanceSnapshot(changed.snapshot, { "old.mkv": { ...fact, size: 200 } }).eligible).toEqual(["old.mkv"]);
  });
});

const skip = !(await pgAvailable());
describe.skipIf(skip)("persistent source monitoring", () => {
  let h: FmHarness | undefined;
  let qb: MockQb | undefined;
  afterEach(async () => {
    await qb?.close();
    qb = undefined;
    await h?.close();
    h = undefined;
  });
  const setup = async () => {
    qb = await createMockQb();
    h = await createFmHarness("source_monitor", {
      ao: {
        downloader: async (inst) =>
          createQbClient({ instanceId: inst.id, baseUrl: qb!.url, username: "admin", password: "adminadmin" }),
      },
    });
    const config: Omit<OrganizeSourceConfig, "id"> = {
      name: "来源",
      enabled: true,
      source: { root: h.dlRoot, path: "" },
      target: { root: h.libRoot, path: "" },
      mediaType: "all",
      category: null,
      action: "copy",
      trigger: "snapshot",
      downloaderInstanceId: null,
      tag: null,
      intervalSec: 60,
    };
    const id = randomUUID();
    await saveOrganizeSource(h.module.deps(), id, config);
    return { h, id, config, qb };
  };
  it("first scan persists stock baseline without records; stock never changes baseline", async () => {
    const { h, id } = await setup();
    await writeFile(join(h.dl, "old.mkv"), "old video content");
    const result = await scanOrganizeSource(h.module.deps(), { sourceId: id });
    expect(result).toMatchObject({ baseline: true, queued: 0 });
    const before = await h.db.selectFrom("organize_source_snapshot").selectAll().executeTakeFirstOrThrow();
    expect(before.baseline_at).not.toBeNull();
    await writeFile(join(h.dl, "new.mkv"), "new video content");
    const stock = await scanStock(h.module.deps(), id);
    expect(stock.items.map((f) => f.path).sort()).toEqual(["new.mkv", "old.mkv"]);
    const after = await h.db.selectFrom("organize_source_snapshot").selectAll().executeTakeFirstOrThrow();
    expect(after).toEqual(before);
    expect(await h.db.selectFrom("organization_record").select("id").execute()).toEqual([]);
    expect((await listOrganizeSources(h.module.deps())).items[0]?.fileCount).toBe(1);
  });
  it("unavailable source preserves baseline and retry does not import historical files", async () => {
    const { h, id } = await setup();
    await writeFile(join(h.dl, "old.mkv"), "old video content");
    await scanOrganizeSource(h.module.deps(), { sourceId: id });
    const before = await h.db.selectFrom("organize_source_snapshot").selectAll().executeTakeFirstOrThrow();
    await rename(h.dl, `${h.dl}-offline`);
    await scanOrganizeSource(h.module.deps(), { sourceId: id });
    const failed = await h.db.selectFrom("organize_source_snapshot").selectAll().executeTakeFirstOrThrow();
    expect(failed.snapshot).toEqual(before.snapshot);
    expect(failed.baseline_at).toEqual(before.baseline_at);
    expect(failed.last_error).not.toBeNull();
    await rename(`${h.dl}-offline`, h.dl);
    expect(await scanOrganizeSource(h.module.deps(), { sourceId: id })).toMatchObject({
      baseline: false,
      eligible: 0,
      queued: 0,
    });
  });
  it("an identified stable new file plans and queues import once", async () => {
    const { h, id, config } = await setup();
    await saveOrganizeSource(h.module.deps(), id, { ...config, category: "欧美电影" });
    const entityId = await seedEntity(h.db, { kind: "movie", title: "Snapshot Film", year: 2024 });
    await h.db
      .insertInto("external_identity")
      .values({
        media_entity_id: entityId,
        provider: "tmdb",
        external_id: "123456",
        status: "accepted",
        entity_type: "movie",
      })
      .execute();
    await scanOrganizeSource(h.module.deps(), { sourceId: id });
    await writeFile(join(h.dl, "Snapshot.Film.2024.tmdb-123456.1080p.BluRay.mkv"), "video content for snapshot import");
    expect(await scanOrganizeSource(h.module.deps(), { sourceId: id })).toMatchObject({ eligible: 0, queued: 0 });
    const stableResult = await scanOrganizeSource(h.module.deps(), { sourceId: id });
    expect(stableResult).toMatchObject({ eligible: 1, queued: 1 });
    const imports = h.engine.enqueued.filter((e) => e.task === "verifyAndImport");
    expect(imports).toHaveLength(1);
    expect(imports[0]?.input).toMatchObject({ recordId: expect.any(String) });
    await scanOrganizeSource(h.module.deps(), { sourceId: id });
    expect(h.engine.enqueued.filter((e) => e.task === "verifyAndImport")).toHaveLength(1);
  });
  it("new stable files create one scoped decision and never reprocess baseline stock", async () => {
    const { h, id } = await setup();
    await writeFile(join(h.dl, "historical.mkv"), "historical video content");
    await scanOrganizeSource(h.module.deps(), { sourceId: id });
    await writeFile(join(h.dl, "unidentified.mkv"), "unidentified video content");
    expect(await scanOrganizeSource(h.module.deps(), { sourceId: id })).toMatchObject({ eligible: 0, queued: 0 });
    expect(await scanOrganizeSource(h.module.deps(), { sourceId: id })).toMatchObject({ eligible: 1, queued: 0 });
    const decisions = await h.db.selectFrom("decision").selectAll().execute();
    expect(decisions).toHaveLength(1);
    expect(decisions[0]?.evidence).toMatchObject({ sourceConfigId: id, root: h.dlRoot, path: "unidentified.mkv" });
    await scanOrganizeSource(h.module.deps(), { sourceId: id });
    expect(await h.db.selectFrom("decision").select("id").execute()).toHaveLength(1);
  });
  it("active and completed QB tasks remain under the downloader tag policy", async () => {
    const { h, id } = await setup();
    await scanOrganizeSource(h.module.deps(), { sourceId: id });
    await writeFile(join(h.dl, "active.mkv"), "active video content");
    await writeFile(join(h.dl, "completed.mkv"), "completed video content");
    await seedDownload(h.db, h, { name: "active.mkv", status: "downloading" });
    await seedDownload(h.db, h, { name: "completed.mkv", status: "completed" });
    await scanOrganizeSource(h.module.deps(), { sourceId: id });
    expect(await scanOrganizeSource(h.module.deps(), { sourceId: id })).toMatchObject({ eligible: 2, queued: 0 });
    expect(await h.db.selectFrom("organization_record").select("id").execute()).toEqual([]);
    expect(await scanStock(h.module.deps(), id)).toMatchObject({
      unavailable: 1,
      items: [{ root: h.dlRoot, path: "completed.mkv" }],
    });
  });
  it("untagged paused QB downloads without DB rows wait for completion before snapshot import", async () => {
    const { h, id, qb, config } = await setup();
    await saveOrganizeSource(h.module.deps(), id, { ...config, category: "欧美电影" });
    const entityId = await seedEntity(h.db, { kind: "movie", title: "Snapshot Film", year: 2024 });
    await h.db
      .insertInto("external_identity")
      .values({
        media_entity_id: entityId,
        provider: "tmdb",
        external_id: "123456",
        status: "accepted",
        entity_type: "movie",
      })
      .execute();
    await scanOrganizeSource(h.module.deps(), { sourceId: id });
    const name = "Snapshot.Film.2024.tmdb-123456.1080p.BluRay.mkv";
    await writeFile(join(h.dl, name), "stable incomplete video content");
    qb.seed({
      hash: "a".repeat(40),
      name,
      tags: [],
      state: "pausedDL",
      progress: 0.5,
      amount_left: 50,
      save_path: h.dl,
      content_path: join(h.dl, name),
    });
    expect(await h.db.selectFrom("download_task").select("id").execute()).toEqual([]);
    await scanOrganizeSource(h.module.deps(), { sourceId: id });
    expect(await scanOrganizeSource(h.module.deps(), { sourceId: id })).toMatchObject({ eligible: 1, queued: 0 });
    expect(await scanStock(h.module.deps(), id)).toMatchObject({ items: [], unavailable: 1 });
    expect(await h.db.selectFrom("decision").select("id").execute()).toEqual([]);
    expect(h.engine.enqueued.filter((e) => e.task === "verifyAndImport")).toEqual([]);
    await qb.complete("a".repeat(40));
    expect(await scanOrganizeSource(h.module.deps(), { sourceId: id })).toMatchObject({ eligible: 1, queued: 1 });
    expect(await h.db.selectFrom("download_task").select("id").execute()).toEqual([]);
  });
  it("unreachable QB preserves the previous baseline and rejects stock", async () => {
    const { h, id, qb } = await setup();
    await writeFile(join(h.dl, "baseline.mkv"), "baseline video content");
    await scanOrganizeSource(h.module.deps(), { sourceId: id });
    const before = await h.db.selectFrom("organize_source_snapshot").selectAll().executeTakeFirstOrThrow();
    qb.fault("torrents/info", { status: 503, times: 10 });
    await writeFile(join(h.dl, "later.mkv"), "later video content");
    expect(await scanOrganizeSource(h.module.deps(), { sourceId: id })).toMatchObject({ queued: 0 });
    const after = await h.db.selectFrom("organize_source_snapshot").selectAll().executeTakeFirstOrThrow();
    expect(after.snapshot).toEqual(before.snapshot);
    expect(after.baseline_at).toEqual(before.baseline_at);
    expect(after.last_error).toContain("无法查询来源下载器");
    await expect(scanStock(h.module.deps(), id)).rejects.toThrow("无法查询来源下载器");
  });
  it("partial records exclude successful files while leaving failed files available", async () => {
    const { h, id } = await setup();
    await writeFile(join(h.dl, "success.mkv"), "successful video content");
    await writeFile(join(h.dl, "failure.mkv"), "failed video content");
    const record = await h.db
      .insertInto("organization_record")
      .values({ trigger: "manual", actor_type: "system", action: "copy", status: "partial" })
      .returning("id")
      .executeTakeFirstOrThrow();
    await h.db
      .insertInto("organization_file_result")
      .values([
        {
          organization_record_id: record.id,
          ordinal: 0,
          mode: "copy",
          source_path: join(h.dl, "success.mkv"),
          status: "succeeded",
        },
        {
          organization_record_id: record.id,
          ordinal: 1,
          mode: "copy",
          source_path: join(h.dl, "failure.mkv"),
          status: "failed",
        },
      ])
      .execute();
    expect(await scanStock(h.module.deps(), id)).toMatchObject({
      items: [{ root: h.dlRoot, path: "failure.mkv" }],
      skipped: 1,
    });
  });
  it("historical success excludes only matching source facts, so replacement files remain candidates", async () => {
    const { h, id } = await setup();
    const names = ["same.mkv", "size-changed.mkv", "mtime-changed.mkv"];
    await Promise.all(names.map((n) => writeFile(join(h.dl, n), "video content")));
    const facts = Object.fromEntries(
      await Promise.all(
        names.map(async (n) => {
          const st = await stat(join(h.dl, n));
          return [join(h.dl, n), { size: st.size, mtimeMs: st.mtimeMs }];
        }),
      ),
    );
    facts[join(h.dl, "size-changed.mkv")]!.size -= 1;
    facts[join(h.dl, "mtime-changed.mkv")]!.mtimeMs -= 1;
    const record = await h.db
      .insertInto("organization_record")
      .values({
        trigger: "manual",
        actor_type: "system",
        action: "copy",
        status: "succeeded",
        plan: JSON.stringify({ sourceFacts: facts }),
      })
      .returning("id")
      .executeTakeFirstOrThrow();
    await h.db
      .insertInto("organization_file_result")
      .values(
        names.map((n, ordinal) => ({
          organization_record_id: record.id,
          ordinal,
          mode: "copy" as const,
          source_path: join(h.dl, n),
          source_size_bytes: facts[join(h.dl, n)]!.size,
          status: "succeeded" as const,
        })),
      )
      .execute();
    const stock = await scanStock(h.module.deps(), id);
    expect(stock.skipped).toBe(1);
    expect(stock.items.map((f) => f.path).sort()).toEqual(["mtime-changed.mkv", "size-changed.mkv"]);
  });
  it("stock batches stay within the identify wizard limit", async () => {
    const { h, id } = await setup();
    await Promise.all(Array.from({ length: 201 }, (_, n) => writeFile(join(h.dl, `stock-${n}.mkv`), "video content")));
    const stock = await scanStock(h.module.deps(), id);
    expect(stock.items).toHaveLength(200);
    expect(stock.truncated).toBe(true);
    expect(await h.db.selectFrom("organize_source_snapshot").selectAll().execute()).toEqual([]);
  });
  it("stock omits successfully organized files", async () => {
    const { h, id } = await setup();
    const path = join(h.dl, "organized.mkv");
    await writeFile(path, "organized video content");
    const record = await h.db
      .insertInto("organization_record")
      .values({ trigger: "manual", actor_type: "system", action: "copy", status: "succeeded" })
      .returning("id")
      .executeTakeFirstOrThrow();
    await h.db
      .insertInto("organization_file_result")
      .values({ organization_record_id: record.id, mode: "copy", source_path: path, status: "succeeded" })
      .execute();
    expect(await scanStock(h.module.deps(), id)).toMatchObject({ items: [], skipped: 1 });
  });
  it("source edits reset baseline; identical categories coexist; deleting removes state", async () => {
    const { h, id, config } = await setup();
    await mkdir(join(h.dl, "other"));
    await scanOrganizeSource(h.module.deps(), { sourceId: id });
    await saveOrganizeSource(h.module.deps(), randomUUID(), { ...config, category: "电影" });
    await saveOrganizeSource(h.module.deps(), id, {
      ...config,
      category: "电影",
      source: { ...config.source, path: "other" },
    });
    expect((await listOrganizeSources(h.module.deps())).items).toHaveLength(2);
    expect(
      await h.db.selectFrom("organize_source_snapshot").selectAll().where("source_id", "=", id).executeTakeFirst(),
    ).toBeUndefined();
    await scanOrganizeSource(h.module.deps(), { sourceId: id });
    await deleteOrganizeSource(h.module.deps(), id);
    expect(
      await h.db.selectFrom("organize_source_snapshot").selectAll().where("source_id", "=", id).executeTakeFirst(),
    ).toBeUndefined();
  });
});