import { describe, it, before, after } from "node:test";
import assert from "node:assert/strict";
import { WrappedNodeSqliteDb } from "../../../src/db/sqlite/impl/node-sqlite.js";
import { SqliteMigrator } from "../../../src/db/sqlite/SqliteMigrator.js";
import { migrations } from "../../../src/db/sqlite/migrations/index.js";

describe("SqliteMigrator", () => {
  it("listAvailableMigrations returns all known migrations", () => {
    const db = new WrappedNodeSqliteDb(":memory:");
    const migrator = new SqliteMigrator(db);
    const available = migrator.listAvailableMigrations();
    assert.ok(Array.isArray(available));
    assert.ok(available.length >= 3, "at least 3 migrations");
    const ids = available.map((m) => m.id);
    assert.ok(ids.includes(1), "migration 1 present");
    assert.ok(ids.includes(2), "migration 2 present");
    assert.ok(ids.includes(3), "migration 3 present");
    db.destroy();
  });

  it("listAppliedMigrations returns empty array on fresh db", async () => {
    const db = new WrappedNodeSqliteDb(":memory:");
    const migrator = new SqliteMigrator(db);
    const applied = await migrator.listAppliedMigrations();
    assert.deepEqual(applied, []);
    db.destroy();
  });

  it("migrateTo(1) applies first migration", async () => {
    const db = new WrappedNodeSqliteDb(":memory:");
    const migrator = new SqliteMigrator(db);
    await migrator.migrateTo(1);
    const applied = await migrator.listAppliedMigrations();
    assert.equal(applied.length, 1);
    assert.equal(applied[0].id, 1);
    assert.ok(applied[0].name, "migration has a name");
    assert.ok(applied[0].applied_at, "migration has applied_at");
    db.destroy();
  });

  it("migrateTo(3) applies all three migrations in order", async () => {
    const db = new WrappedNodeSqliteDb(":memory:");
    const migrator = new SqliteMigrator(db);
    await migrator.migrateTo(3);
    const applied = await migrator.listAppliedMigrations();
    assert.equal(applied.length, 3);
    assert.deepEqual(
      applied.map((m) => m.id),
      [1, 2, 3],
    );
    db.destroy();
  });

  it("migrateTo(3) twice is idempotent (nothing to do)", async () => {
    const db = new WrappedNodeSqliteDb(":memory:");
    const migrator = new SqliteMigrator(db);
    await migrator.migrateTo(3);
    await migrator.migrateTo(3);
    const applied = await migrator.listAppliedMigrations();
    assert.equal(applied.length, 3);
    db.destroy();
  });

  it("migrateTo with unknown id throws", async () => {
    const db = new WrappedNodeSqliteDb(":memory:");
    const migrator = new SqliteMigrator(db);
    await assert.rejects(
      () => migrator.migrateTo(9999),
      /No known migration with id 9999/,
    );
    db.destroy();
  });

  it("listAvailableMigrations names match migration objects", () => {
    const db = new WrappedNodeSqliteDb(":memory:");
    const migrator = new SqliteMigrator(db);
    const available = migrator.listAvailableMigrations();
    for (const { id, name } of available) {
      const migration = migrations.find((m) => m.id === id);
      assert.ok(migration, `migration ${id} exists`);
      assert.equal(migration.name, name);
    }
    db.destroy();
  });
});