const express = require('express');
const { authRequired } = require('../middleware/auth');
const { resolveTenant } = require('../middleware/tenant');

const router = express.Router();

router.get('/active', resolveTenant, async (req, res, next) => {
  try {
    const [[period]] = await req.tenantPool.query('SELECT * FROM survey_periods WHERE estado = "activa" ORDER BY id DESC LIMIT 1');
    if (!period) return res.json({ period: null, questions: [] });

    const [questions] = await req.tenantPool.query(
      'SELECT sq.question_id, sq.question_code, sq.text_snapshot AS text, d.name AS dimension FROM survey_questions sq JOIN dimensions d ON d.id = sq.dimension_id WHERE sq.survey_period_id = ? ORDER BY sq.sort_order ASC',
      [period.id]
    );

    res.json({ period, questions });
  } catch (err) {
    next(err);
  }
});

router.post('/responses', authRequired, resolveTenant, async (req, res, next) => {
  try {
    const { survey_period_id, answers } = req.body;
    if (!survey_period_id || !Array.isArray(answers)) {
      return res.status(400).json({ error: 'survey_period_id y answers requeridos' });
    }
    const [[{ total_questions }]] = await req.tenantPool.query(
      'SELECT COUNT(*) AS total_questions FROM survey_questions WHERE survey_period_id = ?',
      [survey_period_id]
    );
    const uniqueIds = new Set(answers.map((a) => a.question_id));
    if (uniqueIds.size !== total_questions) {
      return res.status(400).json({ error: 'Resultados incompletos' });
    }

    for (const ans of answers) {
      if (![1,2,3,4,5].includes(Number(ans.value))) {
        return res.status(400).json({ error: 'Valor inválido' });
      }
      const [[qrow]] = await req.tenantPool.query(
        'SELECT question_code FROM survey_questions WHERE survey_period_id = ? AND question_id = ? LIMIT 1',
        [survey_period_id, ans.question_id]
      );
      await req.tenantPool.query(
        'INSERT INTO responses (survey_period_id, user_id, question_id, question_code, value) VALUES (?, ?, ?, ?, ?) ON DUPLICATE KEY UPDATE value = VALUES(value)',
        [survey_period_id, req.user.id, ans.question_id, qrow?.question_code || '', ans.value]
      );
    }

    res.json({ ok: true });
  } catch (err) {
    next(err);
  }
});

module.exports = router;