import { Router, Response } from 'express';
import { authenticateUser, AuthenticatedRequest } from '../middleware/auth';
import { getJobById } from '../../db/jobs';
import { createSignedUrl } from '../../db/storage';
import { config } from '../../config';
import { logger } from '../../utils/logger';

const router = Router();

function buildReportDownloadName(inputFileName: string): string {
  const base = String(inputFileName || 'report')
    .replace(/\.[^.]+$/, '')
    .replace(/[\\/:*?"<>|]+/g, ' ')
    .replace(/\s+/g, ' ')
    .trim()
    .slice(0, 140) || 'report';
  return `RelVDev_${base}.pdf`;
}

function buildReceiptDownloadName(inputFileName: string): string {
  const base = String(inputFileName || 'receipt')
    .replace(/\.[^.]+$/, '')
    .replace(/[\\/:*?"<>|]+/g, ' ')
    .replace(/\s+/g, ' ')
    .trim()
    .slice(0, 132) || 'receipt';
  return `RelVDev_Receipt_${base}.pdf`;
}

/**
 * GET /api/jobs/:jobId/report-url
 *
 * Creates a short-lived signed URL for a completed report PDF. The browser
 * should not sign private storage objects directly because storage RLS can hide
 * private files as "not found"; this endpoint verifies job ownership first and
 * then signs with the backend service role.
 */
router.get(
  '/api/jobs/:jobId/report-url',
  authenticateUser,
  async (req, res: Response): Promise<void> => {
    const authReq = req as AuthenticatedRequest;
    const jobId = String(authReq.params.jobId || '');

    try {
      const job = await getJobById(jobId);

      if (!job) {
        res.status(404).json({ error: 'Job not found' });
        return;
      }

      if (job.user_id !== authReq.userId) {
        res.status(403).json({ error: 'Forbidden' });
        return;
      }

      if (!job.output_pdf_path) {
        res.status(404).json({ error: 'Report PDF is not available yet' });
        return;
      }

      if (
        job.output_pdf_expires_at &&
        new Date(job.output_pdf_expires_at).getTime() < Date.now()
      ) {
        res.status(410).json({ error: 'Report PDF has expired' });
        return;
      }

      const signedUrl = await createSignedUrl(
        config.reportBucket,
        job.output_pdf_path,
        300,
        buildReportDownloadName(job.input_file_name),
      );

      res.json({
        signedUrl,
        fileName: buildReportDownloadName(job.input_file_name),
        expiresIn: 300,
        expiresAt: new Date(Date.now() + 300 * 1000).toISOString(),
      });
    } catch (err: unknown) {
      const message = err instanceof Error ? err.message : String(err);
      logger.error('Failed to create report signed URL', {
        jobId,
        userId: authReq.userId,
        error: message,
      });
      res.status(500).json({ error: 'Failed to create report download URL' });
    }
  },
);

/**
 * GET /api/jobs/:jobId/receipt-url
 *
 * Creates a short-lived signed URL for a legacy Digital Receipt PDF.
 */
router.get(
  '/api/jobs/:jobId/receipt-url',
  authenticateUser,
  async (req, res: Response): Promise<void> => {
    const authReq = req as AuthenticatedRequest;
    const jobId = String(authReq.params.jobId || '');

    try {
      const job = await getJobById(jobId);

      if (!job) {
        res.status(404).json({ error: 'Job not found' });
        return;
      }

      if (job.user_id !== authReq.userId) {
        res.status(403).json({ error: 'Forbidden' });
        return;
      }

      if (!job.receipt_pdf_path) {
        res.status(404).json({ error: 'Digital Receipt is not available yet' });
        return;
      }

      if (
        job.receipt_pdf_expires_at &&
        new Date(job.receipt_pdf_expires_at).getTime() < Date.now()
      ) {
        res.status(410).json({ error: 'Digital Receipt has expired' });
        return;
      }

      const fileName = buildReceiptDownloadName(job.input_file_name);
      const signedUrl = await createSignedUrl(
        config.reportBucket,
        job.receipt_pdf_path,
        300,
        fileName,
      );

      res.json({
        signedUrl,
        fileName,
        expiresIn: 300,
        expiresAt: new Date(Date.now() + 300 * 1000).toISOString(),
      });
    } catch (err: unknown) {
      const message = err instanceof Error ? err.message : String(err);
      logger.error('Failed to create Digital Receipt signed URL', {
        jobId,
        userId: authReq.userId,
        error: message,
      });
      res.status(500).json({ error: 'Failed to create Digital Receipt download URL' });
    }
  },
);

export default router;