/**
 * Direct PostgreSQL escape hatch for setting up states the public API doesn't
 * expose — e.g. forcing a user into the locked-PIN state to assert the 429
 * recovery path, or expiring sessions for chaos tests.
 *
 * Most tests should NOT use this: prefer `ApiClient` so the tests exercise
 * the same code paths real users do. Reach for direct SQL only when the API
 * can't get you where you need to go.
 */
import { Client } from 'pg';

const CONN = {
  host: process.env.E2E_DB_HOST ?? 'localhost',
  port: Number(process.env.E2E_DB_PORT ?? '55432'),
  user: process.env.E2E_DB_USER ?? 'eventsnap_test',
  password: process.env.E2E_DB_PASSWORD ?? 'eventsnap_test',
  database: process.env.E2E_DB_NAME ?? 'eventsnap_test',
};

async function withClient<T>(fn: (c: Client) => Promise<T>): Promise<T> {
  const client = new Client(CONN);
  await client.connect();
  try {
    return await fn(client);
  } finally {
    await client.end();
  }
}

export const db = {
  async lockUserPin(userId: string, minutesFromNow = 15) {
    await withClient((c) =>
      c.query(
        `UPDATE "user" SET pin_locked_until = NOW() + ($2 || ' minutes')::interval, failed_pin_attempts = 3 WHERE id = $1`,
        [userId, String(minutesFromNow)]
      )
    );
  },

  async expireSession(userId: string) {
    await withClient((c) =>
      c.query(`UPDATE session SET expires_at = NOW() - interval '1 hour' WHERE user_id = $1`, [
        userId,
      ])
    );
  },

  async setUploadCompressionStatus(
    uploadId: string,
    status: 'pending' | 'processing' | 'done' | 'failed'
  ) {
    await withClient((c) =>
      c.query(`UPDATE upload SET compression_status = $2 WHERE id = $1`, [uploadId, status])
    );
  },

  async countUploadsForUser(userId: string): Promise<number> {
    return withClient(async (c) => {
      const r = await c.query<{ count: string }>(
        `SELECT COUNT(*)::text AS count FROM upload WHERE user_id = $1 AND deleted_at IS NULL`,
        [userId]
      );
      return Number(r.rows[0].count);
    });
  },

  async countSessionsForUser(userId: string): Promise<number> {
    return withClient(async (c) => {
      const r = await c.query<{ count: string }>(
        `SELECT COUNT(*)::text AS count FROM session WHERE user_id = $1`,
        [userId]
      );
      return Number(r.rows[0].count);
    });
  },

  async countPinResetRequestsForUser(userId: string): Promise<number> {
    return withClient(async (c) => {
      const r = await c.query<{ count: string }>(
        `SELECT COUNT(*)::text AS count FROM pin_reset_request WHERE user_id = $1`,
        [userId]
      );
      return Number(r.rows[0].count);
    });
  },

  async setExportReleased(slug: string, released: boolean) {
    await withClient((c) =>
      c.query(`UPDATE event SET export_released_at = $2 WHERE slug = $1`, [
        slug,
        released ? new Date() : null,
      ])
    );
  },

  /**
   * Make an export "ready" (or not) in the epoch model. There is no `export_zip_ready` column any
   * more — readiness is DERIVED (`released AND job.epoch = event.export_epoch AND status='done'`),
   * so a job is ready exactly when its row carries the event's live epoch. To make a `done` job NOT
   * ready we retire it to a dead epoch (-1), which is what a reopen effectively does.
   *
   * `file_path` is deliberately left NULL, so a "ready" job with no file on disk still exercises
   * the download's missing-file 404 branch.
   */
  async setExportZipReady(slug: string, ready: boolean) {
    await withClient((c) =>
      c.query(
        `UPDATE export_job ej
            SET epoch = CASE WHEN $2 THEN e.export_epoch ELSE -1 END
           FROM event e
          WHERE e.id = ej.event_id AND e.slug = $1 AND ej.type = 'zip'`,
        [slug, ready]
      )
    );
  },

  /**
   * Insert a pre-baked export job row to skip the (slow) real compression path. Stamped with the
   * event's CURRENT epoch so it counts as the live generation.
   */
  async fakeExportJob(
    eventSlug: string,
    type: 'zip' | 'html',
    status: 'pending' | 'running' | 'done'
  ) {
    await withClient(async (c) => {
      const ev = await c.query<{ id: string; export_epoch: string }>(
        `SELECT id, export_epoch FROM event WHERE slug = $1`,
        [eventSlug]
      );
      if (ev.rows.length === 0) throw new Error(`No event with slug ${eventSlug}`);
      await c.query(
        `INSERT INTO export_job (event_id, type, status, progress_pct, completed_at, epoch)
         VALUES ($1, $2::export_type, $3::export_status, $4, $5, $6)
         ON CONFLICT (event_id, type) DO UPDATE
           SET status = EXCLUDED.status, progress_pct = EXCLUDED.progress_pct,
               epoch = EXCLUDED.epoch`,
        [
          ev.rows[0].id,
          type,
          status,
          status === 'done' ? 100 : 0,
          status === 'done' ? new Date() : null,
          ev.rows[0].export_epoch,
        ]
      );
    });
  },
};