import { expect, test } from "bun:test";
import type { Db } from "@sttracker/db/db";
import { newId, nowIso } from "@sttracker/db/ids";
import { toJson } from "@sttracker/db/json";
import { forEachDialect } from "@sttracker/db/testing";
import { addEngagement } from "../../src/engagements.ts";
import { upsertEntry } from "../../src/entries.ts";
import { createList } from "../../src/lists.ts";
import { listChanges } from "../../src/sync/changes.ts";
import { makeConnection, makeUser, makeWork } from "./helpers.ts";

async function event(
  db: Db,
  userId: string,
  connectionId: string,
  e: { type: "changed" | "removed" | "merged"; targetEntity: string; targetId: string; payload?: Record<string, unknown> },
): Promise<string> {
  const id = newId();
  await db.k
    .insertInto("change_events")
    .values({
      id,
      user_id: userId,
      connection_id: connectionId,
      run_id: null,
      record_id: null,
      type: e.type,
      target_entity: e.targetEntity,
      target_id: e.targetId,
      payload: toJson(e.payload ?? {}),
      status: "pending",
      created_at: nowIso(),
    })
    .execute();
  return id;
}

async function record(db: Db, connectionId: string, key: string, targetEntity: string, targetId: string): Promise<void> {
  const now = nowIso();
  await db.k
    .insertInto("source_records")
    .values({
      id: newId(),
      connection_id: connectionId,
      key,
      kind: targetEntity,
      current_hash: "h",
      first_seen: now,
      last_seen: now,
      deleted_at: null,
      merged_into_key: null,
      target_entity: targetEntity,
      target_id: targetId,
    })
    .execute();
}

forEachDialect("change titles", (getDb) => {
  test("events carry their target's title, and merged events the merge target's", async () => {
    const db = getDb();
    const userId = await makeUser(db);
    const conn = await makeConnection(db, userId, "hardcover");
    const dune = await upsertEntry(db, userId, await makeWork(db, { title: "Dune" }), { overrides: { title: "Dune (1965)" } }, "user");
    const piranesi = await upsertEntry(db, userId, await makeWork(db, { title: "Piranesi" }), {}, "user");
    const deluxe = await upsertEntry(db, userId, await makeWork(db, { title: "Piranesi (Deluxe)" }), {}, "user");
    const read = await addEngagement(db, userId, piranesi.id, {}, "user");
    const list = await createList(db, userId, { name: "Want to read" });
    await record(db, conn, "b:deluxe", "entry", deluxe.id);

    const onEntry = await event(db, userId, conn, { type: "changed", targetEntity: "entry", targetId: dune.id, payload: { field: "rating", from: 80, to: 60 } });
    const onRead = await event(db, userId, conn, { type: "removed", targetEntity: "engagement", targetId: read.id });
    const onList = await event(db, userId, conn, { type: "removed", targetEntity: "list", targetId: list.id });
    const merged = await event(db, userId, conn, { type: "merged", targetEntity: "entry", targetId: piranesi.id, payload: { key: "b:p", intoKey: "b:deluxe" } });
    const unknownMerge = await event(db, userId, conn, { type: "merged", targetEntity: "entry", targetId: piranesi.id, payload: { key: "b:p", intoKey: "b:nope" } });

    const byId = new Map((await listChanges(db, userId)).items.map((c) => [c.id, c]));
    expect(byId.get(onEntry)!.title).toBe("Dune (1965)");
    expect(byId.get(onRead)!.title).toBe("Piranesi");
    expect(byId.get(onList)!.title).toBe("Want to read");
    expect(byId.get(merged)!.title).toBe("Piranesi");
    expect(byId.get(merged)!.intoTitle).toBe("Piranesi (Deluxe)");
    expect(byId.get(unknownMerge)!.intoTitle).toBeNull();
    expect(byId.get(onEntry)!.intoTitle).toBeUndefined();
  });

  test("a missing target gives a null title", async () => {
    const db = getDb();
    const userId = await makeUser(db);
    const conn = await makeConnection(db, userId, "hardcover");
    const id = await event(db, userId, conn, { type: "removed", targetEntity: "entry", targetId: newId() });
    const [c] = (await listChanges(db, userId)).items;
    expect(c!.id).toBe(id);
    expect(c!.title).toBeNull();
  });
});