const express = require('express');
const router = express.Router();
const bcrypt = require('bcryptjs');
const { isCompanyAdmin } = require('../middleware/auth');
const User = require('../models/User');
const Department = require('../models/Department');
const Ticket = require('../models/Ticket');

router.get('/dashboard', isCompanyAdmin, async (req, res) => {
    try {
        const users = await User.findAll(req.session.user.company_id);
        const tickets = await Ticket.findAll(req.session.user.company_id);
        const departments = await Department.findAll(req.session.user.company_id);
        const stats = await Ticket.countByStatus(req.session.user.company_id);
        res.render('admin/dashboard', { users, tickets, departments, stats });
    } catch (error) {
        console.error(error);
        req.flash('error_msg', 'Error al cargar dashboard');
        res.redirect('/');
    }
});

router.get('/users', isCompanyAdmin, async (req, res) => {
    try {
        const users = await User.findAll(req.session.user.company_id);
        res.render('admin/users', { users });
    } catch (error) {
        console.error(error);
        req.flash('error_msg', 'Error al cargar usuarios');
        res.redirect('/admin/dashboard');
    }
});

router.get('/users/create', isCompanyAdmin, (req, res) => {
    res.render('admin/create-user');
});

router.post('/users/create', isCompanyAdmin, async (req, res) => {
    const { nombre, email, password, rol } = req.body;
    if (!nombre || !email || !password) {
        req.flash('error_msg', 'Todos los campos son obligatorios');
        return res.redirect('/admin/users/create');
    }
    try {
        const existing = await User.findByEmail(email);
        if (existing) {
            req.flash('error_msg', 'El email ya existe');
            return res.redirect('/admin/users/create');
        }
        const hashedPassword = await bcrypt.hash(password, 10);
        const userId = await User.create(req.session.user.company_id, nombre, email, hashedPassword, rol || 'client');
        req.flash('success_msg', 'Usuario creado exitosamente');
        res.redirect('/admin/users');
    } catch (error) {
        console.error(error);
        req.flash('error_msg', 'Error al crear usuario');
        res.redirect('/admin/users/create');
    }
});

router.post('/users/invite/:id', isCompanyAdmin, async (req, res) => {
    try {
        const user = await User.findById(req.params.id);
        if (!user || user.company_id !== req.session.user.company_id) {
            req.flash('error_msg', 'Usuario no encontrado');
            return res.redirect('/admin/users');
        }
        const token = await User.generateInviteToken(user.id);
        const inviteLink = `${req.protocol}://${req.get('host')}/invite/${token}`;
        req.flash('success_msg', `Link de invitación: ${inviteLink}`);
        res.redirect('/admin/users');
    } catch (error) {
        console.error(error);
        req.flash('error_msg', 'Error al generar invitación');
        res.redirect('/admin/users');
    }
});

router.post('/users/delete/:id', isCompanyAdmin, async (req, res) => {
    try {
        const user = await User.findById(req.params.id);
        if (!user || user.company_id !== req.session.user.company_id) {
            req.flash('error_msg', 'Usuario no encontrado');
            return res.redirect('/admin/users');
        }
        if (user.rol === 'superadmin') {
            req.flash('error_msg', 'No puedes eliminar al superadmin');
            return res.redirect('/admin/users');
        }
        await User.delete(req.params.id);
        req.flash('success_msg', 'Usuario eliminado');
        res.redirect('/admin/users');
    } catch (error) {
        console.error(error);
        req.flash('error_msg', 'Error al eliminar usuario');
        res.redirect('/admin/users');
    }
});

router.get('/departments', isCompanyAdmin, async (req, res) => {
    try {
        const departments = await Department.findAll(req.session.user.company_id);
        res.render('admin/departments', { departments });
    } catch (error) {
        console.error(error);
        req.flash('error_msg', 'Error al cargar departamentos');
        res.redirect('/admin/dashboard');
    }
});

router.post('/departments/create', isCompanyAdmin, async (req, res) => {
    const { nombre, descripcion } = req.body;
    if (!nombre) {
        req.flash('error_msg', 'El nombre es obligatorio');
        return res.redirect('/admin/departments');
    }
    try {
        await Department.create(req.session.user.company_id, nombre, descripcion || '');
        req.flash('success_msg', 'Departamento creado');
        res.redirect('/admin/departments');
    } catch (error) {
        console.error(error);
        req.flash('error_msg', 'Error al crear departamento');
        res.redirect('/admin/departments');
    }
});

router.post('/departments/update/:id', isCompanyAdmin, async (req, res) => {
    const { nombre, descripcion } = req.body;
    try {
        await Department.update(req.params.id, nombre, descripcion || '');
        req.flash('success_msg', 'Departamento actualizado');
        res.redirect('/admin/departments');
    } catch (error) {
        console.error(error);
        req.flash('error_msg', 'Error al actualizar departamento');
        res.redirect('/admin/departments');
    }
});

router.post('/departments/delete/:id', isCompanyAdmin, async (req, res) => {
    try {
        await Department.delete(req.params.id);
        req.flash('success_msg', 'Departamento eliminado');
        res.redirect('/admin/departments');
    } catch (error) {
        console.error(error);
        req.flash('error_msg', 'Error al eliminar departamento');
        res.redirect('/admin/departments');
    }
});

module.exports = router;