import { expect, test } from "bun:test";
import { forEachDialect } from "@sttracker/db/testing";
import { defineCustomField } from "../src/custom-fields.ts";
import { NotFoundError } from "../src/errors.ts";
import { getEntry, moveEntryToWork, quickAdd, softDeleteEntry, upsertEntry } from "../src/entries.ts";
import { getHistory, recordHistory, restoreVersion } from "../src/history.ts";
import { makeUser, makeWork } from "./user-layer-fixtures.ts";

forEachDialect("history", (getDb) => {
  test("recordHistory stores only the changed keys", async () => {
    const db = getDb();
    const userId = await makeUser(db);
    const id = await recordHistory(db.k, {
      userId,
      entity: "entry",
      entityId: "e1",
      before: { status: "planned", rating: 50, tags: ["a"] },
      after: { status: "completed", rating: 50, tags: ["a"] },
      actor: "user",
    });
    expect(id).not.toBeNull();
    const none = await recordHistory(db.k, {
      userId,
      entity: "entry",
      entityId: "e1",
      before: { rating: 1 },
      after: { rating: 1 },
      actor: "user",
    });
    expect(none).toBeNull();
    const rows = await getHistory(db, userId, "entry", "e1");
    expect(rows).toHaveLength(1);
    expect(rows[0]!.before).toEqual({ status: "planned" });
    expect(rows[0]!.after).toEqual({ status: "completed" });
    expect(rows[0]!.actor).toBe("user");
  });

  test("restoreVersion brings back previous review", async () => {
    const db = getDb();
    const userId = await makeUser(db);
    const workId = await makeWork(db);
    const e = await upsertEntry(db, userId, workId, { review: "first take" }, "user");
    await upsertEntry(db, userId, workId, { review: "second take", rating: 60 }, "plugin:trakt:c1");

    const history = await getHistory(db, userId, "entry", e.id);
    expect(history).toHaveLength(2);
    const latest = history[0]!; // newest first
    expect(latest.before).toEqual({ review: "first take", rating: null });
    expect(latest.actor).toBe("plugin:trakt:c1");

    await restoreVersion(db, userId, latest.id);
    const view = await getEntry(db, userId, e.id);
    expect(view.review).toBe("first take");
    expect(view.rating).toBeNull();
    expect(view.fieldSources.review).toBe("user");
    expect(view.fieldSources.rating).toBe("user");
    expect(await getHistory(db, userId, "entry", e.id)).toHaveLength(3);
  });

  test("restoreVersion undoes a soft delete", async () => {
    const db = getDb();
    const userId = await makeUser(db);
    const e = await upsertEntry(db, userId, await makeWork(db), { status: "planned" }, "user");
    await softDeleteEntry(db, userId, e.id, "user");
    const [del] = await getHistory(db, userId, "entry", e.id);
    expect(del!.after.deletedAt).toBeString();
    await restoreVersion(db, userId, del!.id);
    expect((await getEntry(db, userId, e.id)).status).toBe("planned");
  });

  test("restoreVersion undoes a move back to the draft work", async () => {
    const db = getDb();
    const userId = await makeUser(db);
    const draft = await quickAdd(db, userId, { title: "Dune??" });
    const shared = await makeWork(db, { title: "Dune", externalIds: { isbn13: "1" } });
    await moveEntryToWork(db, userId, draft.id, shared, "user");
    const [move] = await getHistory(db, userId, "entry", draft.id);
    await restoreVersion(db, userId, move!.id);
    const back = await getEntry(db, userId, draft.id);
    expect(back.workId).toBe(draft.workId);
    expect(back.draft).toBe(true);
    const work = await db.k.selectFrom("works").selectAll().where("id", "=", draft.workId).executeTakeFirstOrThrow();
    expect(work.merged_into_id).toBeNull();
    // undoing removes the forward alias and writes no reverse alias
    expect(await db.k.selectFrom("work_aliases").selectAll().where("user_id", "=", userId).execute()).toEqual([]);
    // a later sync onto the shared work lands on the shared work, not on the draft
    const synced = await upsertEntry(db, userId, shared, { rating: 80 }, "plugin:hardcover:c1");
    expect(synced.workId).toBe(shared);
    expect(synced.id).not.toBe(draft.id);
    expect((await getEntry(db, userId, draft.id)).rating).toBeNull();
  });

  test("restoreVersion does not re-check custom fields against today's definitions", async () => {
    const db = getDb();
    const userId = await makeUser(db);
    const def = await defineCustomField(db, userId, { name: "Mood", type: "text" });
    const e = await upsertEntry(db, userId, await makeWork(db), { customFields: { [def.id]: "cosy" } }, "user");
    await upsertEntry(db, userId, e.workId, { customFields: {} }, "user");
    await db.k.deleteFrom("custom_field_definitions").where("id", "=", def.id).execute();
    const [h] = await getHistory(db, userId, "entry", e.id);
    await restoreVersion(db, userId, h!.id);
    expect((await getEntry(db, userId, e.id)).customFields).toEqual({ [def.id]: "cosy" });
  });

  test("another user's history is invisible", async () => {
    const db = getDb();
    const ada = await makeUser(db);
    const bob = await makeUser(db, "bob");
    const e = await upsertEntry(db, ada, await makeWork(db), { review: "x" }, "user");
    expect(await getHistory(db, bob, "entry", e.id)).toEqual([]);
    const [h] = await getHistory(db, ada, "entry", e.id);
    await expect(restoreVersion(db, bob, h!.id)).rejects.toThrow(NotFoundError);
  });
});