const express = require('express');
const crypto = require('crypto');
const { requireRole } = require('../middleware/auth');
const { recordActivity } = require('../services/activityService');

const requireApiKey = (req, res) => {
  if (req.user.is_api_key) return true;
  res.status(403).json({ error: 'Endpoint restrito a chaves de API.' });
  return false;
};

const createIntegrationsRouter = ({ pool }) => {
  const router = express.Router();

  router.get('/integration/users', requireRole(['admin']), async (req, res) => {
    if (!requireApiKey(req, res)) return;
    try {
      const [rows] = await pool.query(
        'SELECT u.id, u.name, u.email, t.name as team_name FROM users u LEFT JOIN teams t ON u.team_id = t.id WHERE u.tenant_id = ? AND u.status = "active"',
        [req.user.tenant_id]
      );
      res.json(rows);
    } catch (error) {
      res.status(500).json({ error: error.message });
    }
  });

  router.get('/integration/origins', requireRole(['admin']), async (req, res) => {
    if (!requireApiKey(req, res)) return;
    try {
      const [groups] = await pool.query('SELECT id, name FROM origin_groups WHERE tenant_id = ?', [req.user.tenant_id]);
      if (groups.length === 0) return res.json([]);

      const [items] = await pool.query('SELECT origin_group_id, name FROM origin_items WHERE origin_group_id IN (?) ORDER BY created_at ASC', [groups.map(g => g.id)]);
      const [teams] = await pool.query('SELECT id as team_id, name as team_name, origin_group_id FROM teams WHERE tenant_id = ? AND origin_group_id IS NOT NULL', [req.user.tenant_id]);

      const result = groups.map(g => ({
        group_name: g.name,
        origins: items.filter(i => i.origin_group_id === g.id).map(i => i.name),
        assigned_teams: teams.filter(t => t.origin_group_id === g.id).map(t => ({ id: t.team_id, name: t.team_name }))
      }));

      res.json(result);
    } catch (error) {
      res.status(500).json({ error: error.message });
    }
  });

  router.get('/integration/funnels', requireRole(['admin']), async (req, res) => {
    if (!requireApiKey(req, res)) return;
    try {
      const [funnels] = await pool.query('SELECT id, name FROM funnels WHERE tenant_id = ?', [req.user.tenant_id]);
      if (funnels.length === 0) return res.json([]);

      const [stages] = await pool.query('SELECT funnel_id, name, order_index FROM funnel_stages WHERE funnel_id IN (?) ORDER BY order_index ASC', [funnels.map(f => f.id)]);
      const [teams] = await pool.query('SELECT id as team_id, name as team_name, funnel_id FROM teams WHERE tenant_id = ? AND funnel_id IS NOT NULL', [req.user.tenant_id]);

      const result = funnels.map(f => ({
        funnel_name: f.name,
        stages: stages.filter(s => s.funnel_id === f.id).map(s => s.name),
        assigned_teams: teams.filter(t => t.funnel_id === f.id).map(t => ({ id: t.team_id, name: t.team_name }))
      }));

      res.json(result);
    } catch (error) {
      res.status(500).json({ error: error.message });
    }
  });

  router.post('/integration/attendances', requireRole(['admin']), async (req, res) => {
    if (!requireApiKey(req, res)) return;

    const {
      user_id,
      origin,
      funnel_stage,
      title,
      full_summary,
      score,
      first_response_time_min,
      handling_time_min,
      product_requested,
      product_sold,
      converted,
      attention_points,
      improvement_points
    } = req.body;

    if (!user_id || !origin || !funnel_stage || !title) {
      return res.status(400).json({ error: 'Campos obrigatórios ausentes: user_id, origin, funnel_stage, title' });
    }

    try {
      const [users] = await pool.query('SELECT id FROM users WHERE id = ? AND tenant_id = ? AND status = "active"', [user_id, req.user.tenant_id]);
      if (users.length === 0) return res.status(400).json({ error: 'user_id inválido, inativo ou não pertence a esta organização.' });

      const attId = `att_${crypto.randomUUID().split('-')[0]}`;
      await pool.query(
        `INSERT INTO attendances (
          id, tenant_id, user_id, title, full_summary, score,
          first_response_time_min, handling_time_min,
          funnel_stage, origin, product_requested, product_sold,
          converted, attention_points, improvement_points
        ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
        [
          attId,
          req.user.tenant_id,
          user_id,
          title,
          full_summary || null,
          score || 0,
          first_response_time_min || 0,
          handling_time_min || 0,
          funnel_stage,
          origin,
          product_requested || null,
          product_sold || null,
          converted ? 1 : 0,
          attention_points ? JSON.stringify(attention_points) : null,
          improvement_points ? JSON.stringify(improvement_points) : null
        ]
      );

      if (converted) {
        const [managers] = await pool.query(
          "SELECT id FROM users WHERE tenant_id = ? AND role IN ('admin', 'manager') AND id != ?",
          [req.user.tenant_id, user_id]
        );
        const [agentInfo] = await pool.query("SELECT name FROM users WHERE id = ?", [user_id]);
        const agentName = agentInfo[0]?.name || 'Um agente';

        for (const m of managers) {
          await recordActivity(pool, {
            userId: m.id,
            type: 'success',
            title: 'Venda Fechada!',
            message: `${agentName} converteu um lead em ${funnel_stage}.`,
            link: `/attendances/${attId}`,
          });
        }
      }

      res.status(201).json({ id: attId, message: 'Atendimento registrado com sucesso.' });
    } catch (error) {
      console.error('Integration Error:', error);
      res.status(500).json({ error: error.message });
    }
  });

  return router;
};

module.exports = {
  createIntegrationsRouter,
};