const express = require('express');
const router = express.Router();
const pool = require('../db');

// Helper for OTRS CE GenericInterface REST API calls
async function otrsRequest(method, path, bodyData = {}) {
  const OTRS_API_USER = process.env.OTRS_API_USER;
  const OTRS_API_PASSWORD = process.env.OTRS_API_PASSWORD;
  const OTRS_API_URL = process.env.OTRS_API_URL;

  if (!OTRS_API_URL || !OTRS_API_USER) {
    return null;
  }
  const url = `${OTRS_API_URL.replace(/\/$/, '')}${path.startsWith('/') ? path : '/' + path}`;
  const payload = {
    UserLogin: OTRS_API_USER,
    Password: OTRS_API_PASSWORD,
    ...bodyData
  };

  const controller = new AbortController();
  const timeoutId = setTimeout(() => controller.abort(), 6000);

  try {
    const response = await fetch(url, {
      method,
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload),
      signal: controller.signal
    });
    clearTimeout(timeoutId);

    if (!response.ok) {
      const errorText = await response.text();
      throw new Error(`OTRS REST API error (${response.status}): ${errorText}`);
    }
    return await response.json();
  } catch (err) {
    clearTimeout(timeoutId);
    if (err.name === 'AbortError') {
      throw new Error('OTRS REST API request timed out (6s limit exceeded)');
    }
    throw err;
  }
}


// GET /api/queues — Active queues
router.get('/queues', async (req, res) => {
  try {
    const result = await pool.query(
      `SELECT q.id, q.name, q.comments
       FROM queue q
       WHERE q.valid_id = 1
       ORDER BY q.name`
    );
    res.json(result.rows);
  } catch (err) {
    console.error('Error fetching queues:', err);
    res.status(500).json({ error: err.message });
  }
});

// GET /api/states — Ticket states with state type
router.get('/states', async (req, res) => {
  try {
    const result = await pool.query(
      `SELECT ts.id, ts.name, tst.name AS type_name
       FROM ticket_state ts
       JOIN ticket_state_type tst ON ts.type_id = tst.id
       WHERE ts.valid_id = 1
       ORDER BY ts.id`
    );
    res.json(result.rows);
  } catch (err) {
    console.error('Error fetching states:', err);
    res.status(500).json({ error: err.message });
  }
});

// GET /api/priorities — Ticket priorities
router.get('/priorities', async (req, res) => {
  try {
    const result = await pool.query(
      `SELECT id, name, color
       FROM ticket_priority
       WHERE valid_id = 1
       ORDER BY id`
    );
    res.json(result.rows);
  } catch (err) {
    console.error('Error fetching priorities:', err);
    res.status(500).json({ error: err.message });
  }
});

// GET /api/users — Active agents/operators
router.get('/users', async (req, res) => {
  try {
    const result = await pool.query(
      `SELECT id, login, first_name, last_name, title
       FROM users
       WHERE valid_id = 1
       ORDER BY last_name, first_name`
    );
    res.json(result.rows);
  } catch (err) {
    console.error('Error fetching users:', err);
    res.status(500).json({ error: err.message });
  }
});

// GET /api/config — Application config
router.get('/config', (req, res) => {
  res.json({
    defaultAgentLogin: process.env.OTRS_API_USER || '',
    dailyTargetTime: parseInt(process.env.DAILY_TARGET_TIME, 10) || 480
  });
});

// GET /api/users/time-today — Get sum of today's time units for active agent
router.get('/users/time-today', async (req, res) => {
  try {
    const operatorId = parseInt(req.headers['x-agent-id'], 10) || 1;
    const result = await pool.query(
      `SELECT COALESCE(SUM(time_unit), 0) AS total_today
       FROM time_accounting
       WHERE create_by = $1 AND DATE(create_time) = CURRENT_DATE`,
      [operatorId]
    );
    res.json({ totalToday: parseFloat(result.rows[0].total_today) });
  } catch (err) {
    console.error('Error fetching today\'s time units:', err);
    res.status(500).json({ error: err.message });
  }
});


// GET /api/types — Ticket types
router.get('/types', async (req, res) => {
  try {
    const result = await pool.query(
      `SELECT id, name
       FROM ticket_type
       WHERE valid_id = 1
       ORDER BY name`
    );
    res.json(result.rows);
  } catch (err) {
    console.error('Error fetching types:', err);
    res.status(500).json({ error: err.message });
  }
});

// GET /api/lock-types — Ticket lock types
router.get('/lock-types', async (req, res) => {
  try {
    const result = await pool.query(
      `SELECT id, name FROM ticket_lock_type WHERE valid_id = 1 ORDER BY id`
    );
    res.json(result.rows);
  } catch (err) {
    console.error('Error fetching lock types:', err);
    res.status(500).json({ error: err.message });
  }
});

// GET /api/customer-companies/search — Search customer companies
router.get('/customer-companies/search', async (req, res) => {
  try {
    const { q = '' } = req.query;
    let result;
    if (!q) {
      result = await pool.query(
        `SELECT customer_id, name
         FROM customer_company
         WHERE valid_id = 1
         ORDER BY name
         LIMIT 20`
      );
    } else {
      const searchTerm = `%${q}%`;
      result = await pool.query(
        `SELECT customer_id, name
         FROM customer_company
         WHERE valid_id = 1 AND (
           customer_id ILIKE $1 OR
           name ILIKE $1
         )
         ORDER BY name
         LIMIT 20`,
        [searchTerm]
      );
    }
    res.json(result.rows);
  } catch (err) {
    console.error('Error searching customer companies:', err);
    res.status(500).json({ error: err.message });
  }
});

// GET /api/customer-users/search — Search customer users (always from local DB)
router.get('/customer-users/search', async (req, res) => {
  try {
    const { q = '', customer_company_id } = req.query;

    let queryText;
    let queryParams;
    if (q) {
      const searchTerm = `%${q}%`;
      queryText = `
        SELECT login, email, first_name, last_name, customer_id
        FROM customer_user
        WHERE valid_id = 1 AND (
          login ILIKE $1 OR
          email ILIKE $1 OR
          first_name ILIKE $1 OR
          last_name ILIKE $1
        )
      `;
      queryParams = [searchTerm];
      if (customer_company_id) {
        queryText += ` AND customer_id = $2`;
        queryParams.push(customer_company_id);
      }
    } else {
      queryText = `
        SELECT login, email, first_name, last_name, customer_id
        FROM customer_user
        WHERE valid_id = 1
      `;
      queryParams = [];
      if (customer_company_id) {
        queryText += ` AND customer_id = $1`;
        queryParams.push(customer_company_id);
      }
    }

    queryText += ` ORDER BY last_name, first_name LIMIT 20`;

    const result = await pool.query(queryText, queryParams);
    res.json(result.rows);
  } catch (err) {
    console.error('Error searching customer users:', err);
    res.status(500).json({ error: err.message });
  }
});

// GET /api/agents/search — Search active agents
router.get('/agents/search', async (req, res) => {
  try {
    const { q } = req.query;
    const searchTerm = q ? `%${q}%` : '%';
    const result = await pool.query(
      `SELECT id, login, first_name, last_name
       FROM users
       WHERE valid_id = 1 AND (
         login ILIKE $1 OR
         first_name ILIKE $1 OR
         last_name ILIKE $1
       )
       ORDER BY last_name, first_name
       LIMIT 20`,
      [searchTerm]
    );
    res.json(result.rows);
  } catch (err) {
    console.error('Error searching agents:', err);
    res.status(500).json({ error: err.message });
  }
});

// GET /api/queues/search — Search active queues
router.get('/queues/search', async (req, res) => {
  try {
    const { q } = req.query;
    const searchTerm = q ? `%${q}%` : '%';
    const result = await pool.query(
      `SELECT id, name
       FROM queue
       WHERE valid_id = 1 AND name ILIKE $1
       ORDER BY name
       LIMIT 20`,
      [searchTerm]
    );
    res.json(result.rows);
  } catch (err) {
    console.error('Error searching queues:', err);
    res.status(500).json({ error: err.message });
  }
});

// GET /api/states/search — Search active ticket states
router.get('/states/search', async (req, res) => {
  try {
    const { q } = req.query;
    const searchTerm = q ? `%${q}%` : '%';
    const result = await pool.query(
      `SELECT id, name
       FROM ticket_state
       WHERE valid_id = 1 AND name ILIKE $1
       ORDER BY name
       LIMIT 20`,
      [searchTerm]
    );
    res.json(result.rows);
  } catch (err) {
    console.error('Error searching states:', err);
    res.status(500).json({ error: err.message });
  }
});

module.exports = router;