import { expect, test } from "bun:test";
import type { Db } from "@sttracker/db/db";
import { newId, nowIso } from "@sttracker/db/ids";
import { fromJson } from "@sttracker/db/json";
import { forEachDialect } from "@sttracker/db/testing";
import { AuthError, ValidationError } from "../src/errors.ts";
import { matchWork } from "../src/matching.ts";
import {
  adminMergeWorks,
  createWork,
  findWorkByExternalIds,
  getWork,
  resolveAlias,
  searchWorks,
  updateWorkFromHint,
} from "../src/works.ts";

async function addUser(db: Db, role: "admin" | "member" = "member"): Promise<string> {
  const id = newId();
  const now = nowIso();
  await db.k
    .insertInto("users")
    .values({ id, username: `u${id}`, display_name: "U", password_hash: "x", role, preferences: "{}", created_at: now, updated_at: now })
    .execute();
  return id;
}

async function addEntry(db: Db, userId: string, workId: string): Promise<string> {
  const id = newId();
  const now = nowIso();
  await db.k
    .insertInto("entries")
    .values({
      id, user_id: userId, work_id: workId, status: "none", rating: null, review: null, private_notes: null,
      favorite: 0, tags: "[]", custom_fields: "{}", visibility: "private", overrides: "{}",
      media_type_override: null, field_sources: "{}", created_at: now, updated_at: now, deleted_at: null,
    })
    .execute();
  return id;
}

forEachDialect("works", (getDb) => {
  test("createWork stores external ids; findWorkByExternalIds finds any namespace", async () => {
    const db = getDb();
    const id = await createWork(db, { hint: { title: "Dune", mediaType: "book", year: 1965, externalIds: { isbn13: "9780441013593", hardcover_book: "7" } } }, "test");
    expect(await findWorkByExternalIds(db, { nope: "1", hardcover_book: "7" })).toBe(id);
    expect(await findWorkByExternalIds(db, { isbn13: "0" })).toBeNull();
    expect((await getWork(db, id))?.year).toBe(1965);
  });

  test("updateWorkFromHint updates shared work, logs history, never touches private", async () => {
    const db = getDb();
    const u = await addUser(db);
    const shared = await createWork(db, { hint: { title: "Dune", mediaType: "book", externalIds: { a: "1" } } }, "t");
    await updateWorkFromHint(db, shared, { title: "Dune", mediaType: "book", year: 1965, description: "Sand", externalIds: { a: "1", b: "2" } }, "plug");
    const w = await getWork(db, shared);
    expect(w?.year).toBe(1965);
    expect(w?.description).toBe("Sand");
    expect(await findWorkByExternalIds(db, { b: "2" })).toBe(shared);
    const hist = await db.k.selectFrom("work_history").selectAll().where("work_id", "=", shared).where("actor", "=", "plug").execute();
    expect(hist).toHaveLength(1);
    expect(fromJson<Record<string, unknown>>(hist[0]!.before, {}).year).toBeNull();

    const priv = await createWork(db, { hint: { title: "Mine", mediaType: "book", externalIds: {} }, ownerUserId: u }, "t");
    await updateWorkFromHint(db, priv, { title: "Changed", mediaType: "book", externalIds: {} }, "plug");
    expect((await getWork(db, priv))?.title).toBe("Mine");
  });

  test("private works invisible to other users in search", async () => {
    const db = getDb();
    const u1 = await addUser(db);
    const u2 = await addUser(db);
    await createWork(db, { hint: { title: "Secret 100%", mediaType: "book", externalIds: {} }, ownerUserId: u1 }, "t");
    await createWork(db, { hint: { title: "Public Thing", mediaType: "book", externalIds: { x: "1" } } }, "t");
    expect((await searchWorks(db, u1, "secret 100%")).map((w) => w.title)).toEqual(["Secret 100%"]);
    expect(await searchWorks(db, u2, "secret")).toEqual([]);
    expect((await searchWorks(db, u2, "PUBLIC")).map((w) => w.title)).toEqual(["Public Thing"]);
    expect(await searchWorks(db, u2, "public", { mediaType: "game" })).toEqual([]);
  });

  test("adminMergeWorks requires admin", async () => {
    const db = getDb();
    const member = await addUser(db);
    const a = await createWork(db, { hint: { title: "A", mediaType: "book", externalIds: { x: "1" } } }, "t");
    const b = await createWork(db, { hint: { title: "B", mediaType: "book", externalIds: { x: "2" } } }, "t");
    await expect(adminMergeWorks(db, member, a, b)).rejects.toBeInstanceOf(AuthError);
  });

  test("adminMergeWorks tombstones, moves ids, repoints entries, emits merged event on conflict", async () => {
    const db = getDb();
    const admin = await addUser(db, "admin");
    const u1 = await addUser(db);
    const u2 = await addUser(db);
    const from = await createWork(db, { hint: { title: "Old", mediaType: "book", externalIds: { x: "1" } } }, "t");
    const to = await createWork(db, { hint: { title: "New", mediaType: "book", externalIds: { x: "2" } } }, "t");
    const e1 = await addEntry(db, u1, from);
    const e2from = await addEntry(db, u2, from);
    await addEntry(db, u2, to);

    await adminMergeWorks(db, admin, from, to);

    expect((await getWork(db, from))?.id).toBe(to);
    expect(await findWorkByExternalIds(db, { x: "1" })).toBe(to);
    expect(await resolveAlias(db, u1, from)).toBe(to);
    expect((await db.k.selectFrom("entries").select("work_id").where("id", "=", e1).executeTakeFirstOrThrow()).work_id).toBe(to);
    expect((await db.k.selectFrom("entries").select("work_id").where("id", "=", e2from).executeTakeFirstOrThrow()).work_id).toBe(from);
    const ev = await db.k.selectFrom("change_events").selectAll().execute();
    expect(ev).toHaveLength(1);
    expect(ev[0]).toMatchObject({ user_id: u2, type: "merged", status: "pending", target_entity: "entry", target_id: e2from });
    expect(fromJson(ev[0]!.payload, {})).toEqual({ fromWorkId: from, toWorkId: to });
    expect(await db.k.selectFrom("work_history").select("id").where("work_id", "=", from).where("actor", "=", admin).execute()).toHaveLength(1);
  });

  test("createWork refuses external ids on a private work", async () => {
    const db = getDb();
    const u = await addUser(db);
    const p = createWork(db, { hint: { title: "Mine", mediaType: "book", externalIds: { isbn13: "1" } }, ownerUserId: u }, "t");
    await expect(p).rejects.toBeInstanceOf(ValidationError);
    await expect(p).rejects.toMatchObject({ field: "externalIds", reason: "private works cannot carry external ids" });
    expect(await db.k.selectFrom("works").select("id").execute()).toHaveLength(0);
  });

  test("findWorkByExternalIds only returns works visible to the user", async () => {
    const db = getDb();
    const a = await addUser(db);
    const b = await addUser(db);
    const priv = await createWork(db, { hint: { title: "Mine", mediaType: "book", externalIds: {} }, ownerUserId: a }, "t");
    // Legacy data: a private work carrying an external id (no longer creatable through createWork).
    await db.k.insertInto("external_ids").values({ id: newId(), work_id: priv, namespace: "isbn13", value: "42" }).execute();
    expect(await findWorkByExternalIds(db, { isbn13: "42" }, a)).toBe(priv);
    expect(await findWorkByExternalIds(db, { isbn13: "42" }, b)).toBeNull();
    expect(await findWorkByExternalIds(db, { isbn13: "42" })).toBeNull();
    const shared = await createWork(db, { hint: { title: "Theirs", mediaType: "book", externalIds: { asin: "X" } } }, "t");
    const hint = { title: "Mine", mediaType: "book" as const, externalIds: { isbn13: "42", asin: "X" } };
    expect(await matchWork(db, b, hint, "p")).toEqual({ workId: shared, created: false, draft: false });
    expect(await matchWork(db, a, hint, "p")).toEqual({ workId: priv, created: false, draft: true });
  });

  test("getWork returns null on a merged_into cycle", async () => {
    const db = getDb();
    const a = await createWork(db, { hint: { title: "A", mediaType: "book", externalIds: { x: "1" } } }, "t");
    const b = await createWork(db, { hint: { title: "B", mediaType: "book", externalIds: { x: "2" } } }, "t");
    await db.k.updateTable("works").set({ merged_into_id: b }).where("id", "=", a).execute();
    await db.k.updateTable("works").set({ merged_into_id: a }).where("id", "=", b).execute();
    expect(await getWork(db, a)).toBeNull();
  });

  test("search treats a literal _ as a character, not a wildcard", async () => {
    const db = getDb();
    const u = await addUser(db);
    await createWork(db, { hint: { title: "snake_case", mediaType: "book", externalIds: { x: "1" } } }, "t");
    await createWork(db, { hint: { title: "snakeXcase", mediaType: "book", externalIds: { x: "2" } } }, "t");
    expect((await searchWorks(db, u, "e_c")).map((w) => w.title)).toEqual(["snake_case"]);
  });

  test("adminMergeWorks refuses private works", async () => {
    const db = getDb();
    const admin = await addUser(db, "admin");
    const shared = await createWork(db, { hint: { title: "A", mediaType: "book", externalIds: { x: "1" } } }, "t");
    const priv = await createWork(db, { hint: { title: "B", mediaType: "book", externalIds: {} }, ownerUserId: admin }, "t");
    await expect(adminMergeWorks(db, admin, priv, shared)).rejects.toBeInstanceOf(ValidationError);
    await expect(adminMergeWorks(db, admin, shared, priv)).rejects.toBeInstanceOf(ValidationError);
    expect((await getWork(db, priv))?.id).toBe(priv);
  });

  test("adminMergeWorks moves children that do not collide, so matching does not recreate them", async () => {
    const db = getDb();
    const admin = await addUser(db, "admin");
    const u = await addUser(db);
    const show = (id: string) => ({ title: "Lost", mediaType: "show" as const, externalIds: { tmdb_show: id } });
    const ep = (showId: string, season: number) => ({
      title: "Pilot",
      mediaType: "episode" as const,
      externalIds: {},
      position: { season, episode: 1 },
      parent: { title: `Season ${season}`, mediaType: "season" as const, externalIds: {}, position: { season }, parent: show(showId) },
    });
    const a1 = await matchWork(db, u, ep("A", 1), "p");
    const a2 = await matchWork(db, u, ep("A", 2), "p");
    const b2 = await matchWork(db, u, ep("B", 2), "p");
    const showA = (await findWorkByExternalIds(db, { tmdb_show: "A" }))!;
    const showB = (await findWorkByExternalIds(db, { tmdb_show: "B" }))!;
    const seasonA1 = (await getWork(db, a1.workId))!.parent_id!;
    const seasonA2 = (await getWork(db, a2.workId))!.parent_id!;
    const before = (await db.k.selectFrom("works").select("id").execute()).length;

    await adminMergeWorks(db, admin, showA, showB);

    expect((await getWork(db, seasonA1))?.parent_id).toBe(showB); // moved: B had no season 1
    expect((await getWork(db, seasonA2))?.parent_id).toBe(showA); // left: B already had season 2
    const again = await matchWork(db, u, ep("A", 1), "p");
    expect(again).toEqual({ workId: a1.workId, created: false, draft: false });
    expect((await matchWork(db, u, ep("A", 2), "p")).workId).toBe(b2.workId);
    expect((await db.k.selectFrom("works").select("id").execute()).length).toBe(before);
  });
});