const express = require('express');
const { prisma } = require('../utils/db');
const { authenticate } = require('../middleware/auth');
const matchingService = require('../services/matching');
const { SUGGESTION_STATUS } = require('../constants');

const router = express.Router();

// POST /api/admin/events/:slug/run-now - Trigger matching immediately for an event
router.post('/events/:slug/run-now', authenticate, async (req, res, next) => {
  try {
    const { slug } = req.params;

    const event = await prisma.event.findUnique({
      where: { slug },
      select: { id: true, slug: true },
    });

    if (!event) {
      return res.status(404).json({ success: false, error: 'Event not found' });
    }

    const startedAt = new Date();
    const runRow = await prisma.matchingRun.create({
      data: {
        eventId: event.id,
        trigger: 'manual',
        status: 'running',
        startedAt,
      },
    });

    try {
      const suggestions = await matchingService.runMatching(event.id);
      await matchingService.saveMatchingResults(event.id, suggestions);

      const notFoundCount = suggestions.filter(s => s.status === SUGGESTION_STATUS.NOT_FOUND).length;
      const matchedCount = suggestions.filter(s => s.status === SUGGESTION_STATUS.PENDING).length;

      await prisma.matchingRun.update({
        where: { id: runRow.id },
        data: {
          status: 'success',
          endedAt: new Date(),
          matchedCount,
          notFoundCount,
        },
      });

      return res.json({
        success: true,
        data: {
          eventSlug: event.slug,
          startedAt,
          endedAt: new Date(),
          matched: matchedCount,
          notFound: notFoundCount,
        },
      });
    } catch (err) {
      await prisma.matchingRun.update({
        where: { id: runRow.id },
        data: {
          status: 'error',
          endedAt: new Date(),
          error: String(err?.message || err),
        },
      });
      return res.status(500).json({ success: false, error: 'Matching failed', details: String(err?.message || err) });
    }
  } catch (error) {
    next(error);
  }
});

// GET /api/admin/events/:slug/matching-runs?limit=20 - List recent runs
router.get('/events/:slug/matching-runs', authenticate, async (req, res, next) => {
  try {
    const { slug } = req.params;
    const limit = Math.min(parseInt(req.query.limit || '20', 10), 100);

    const event = await prisma.event.findUnique({
      where: { slug },
      select: { id: true },
    });

    if (!event) {
      return res.status(404).json({ success: false, error: 'Event not found' });
    }

    const runs = await prisma.matchingRun.findMany({
      where: { eventId: event.id },
      orderBy: { startedAt: 'desc' },
      take: limit,
      select: {
        id: true,
        trigger: true,
        status: true,
        startedAt: true,
        endedAt: true,
        matchedCount: true,
        notFoundCount: true,
        error: true,
      },
    });

    res.json({ success: true, count: runs.length, data: runs });
  } catch (error) {
    next(error);
  }
});

module.exports = router;