// Rotas MDM para cliente Windows buscar e executar comandos
const express = require('express');
const router = express.Router();
const { query } = require('../config/database');

// Cliente busca comandos pendentes
router.post('/commands/poll', async (req, res) => {
    try {
        const { device_id } = req.body;

        if (!device_id) {
            return res.status(400).json({ success: false, message: 'device_id é obrigatório' });
        }

        // Buscar comandos pendentes ordenados por prioridade
        const result = await pool.query(`
            SELECT 
                pc.*,
                p.name as policy_name,
                p.description as policy_description
            FROM policy_commands pc
            INNER JOIN policies p ON pc.policy_id = p.id
            WHERE pc.device_id = $1 
            AND pc.status IN ('pending', 'sent')
            AND pc.retry_count < pc.max_retries
            ORDER BY pc.priority DESC, pc.created_at ASC
            LIMIT 10
        `, [device_id]);

        if (result.rows.length > 0) {
            // Marcar comandos como 'sent'
            const commandIds = result.rows.map(r => r.id);
            await pool.query(`
                UPDATE policy_commands
                SET status = 'sent', sent_at = NOW()
                WHERE id = ANY($1) AND status = 'pending'
            `, [commandIds]);

            console.log(`📤 Enviando ${result.rows.length} comando(s) para ${device_id}`);
        }

        res.json({
            success: true,
            commands: result.rows.map(cmd => ({
                command_id: cmd.id,
                policy_id: cmd.policy_id,
                policy_name: cmd.policy_name,
                policy_description: cmd.policy_description,
                command_type: cmd.command_type,
                command_data: cmd.command_data,
                priority: cmd.priority
            }))
        });
    } catch (error) {
        console.error('Erro ao buscar comandos:', error);
        res.status(500).json({ success: false, message: error.message });
    }
});

// Cliente reporta início de execução
router.post('/commands/:id/start', async (req, res) => {
    try {
        const { id } = req.params;

        await pool.query(`
            UPDATE policy_commands
            SET status = 'executing'
            WHERE id = $1
        `, [id]);

        res.json({ success: true, message: 'Execução iniciada' });
    } catch (error) {
        console.error('Erro ao iniciar execução:', error);
        res.status(500).json({ success: false, message: error.message });
    }
});

// Cliente reporta resultado da execução
router.post('/commands/:id/result', async (req, res) => {
    try {
        const { id } = req.params;
        const {
            status, // 'success' ou 'failed'
            result,
            error_message,
            duration_seconds
        } = req.body;

        // Buscar informações do comando
        const commandResult = await pool.query(`
            SELECT device_id, policy_id
            FROM policy_commands
            WHERE id = $1
        `, [id]);

        if (commandResult.rows.length === 0) {
            return res.status(404).json({ success: false, message: 'Comando não encontrado' });
        }

        const { device_id, policy_id } = commandResult.rows[0];

        // Atualizar comando
        if (status === 'success') {
            await pool.query(`
                UPDATE policy_commands
                SET status = $1,
                    completed_at = NOW(),
                    result = $2
                WHERE id = $3
            `, [status, JSON.stringify(result), id]);
        } else {
            // Se falhou, incrementar retry_count
            await pool.query(`
                UPDATE policy_commands
                SET status = $1,
                    completed_at = NOW(),
                    result = $2,
                    error_message = $3,
                    retry_count = retry_count + 1
                WHERE id = $4
            `, [status, JSON.stringify(result), error_message, id]);
        }

        // Registrar no histórico
        await pool.query(`
            INSERT INTO policy_executions (
                device_id,
                policy_id,
                command_id,
                status,
                duration_seconds,
                result,
                error_message
            ) VALUES ($1, $2, $3, $4, $5, $6, $7)
        `, [
            device_id,
            policy_id,
            id,
            status,
            duration_seconds,
            JSON.stringify(result),
            error_message
        ]);

        console.log(`${status === 'success' ? '✅' : '❌'} Comando ${id} executado: ${status}`);
        res.json({ success: true, message: 'Resultado registrado' });
    } catch (error) {
        console.error('Erro ao registrar resultado:', error);
        res.status(500).json({ success: false, message: error.message });
    }
});

// Buscar políticas aplicadas ao dispositivo
router.get('/policies/:device_id', async (req, res) => {
    try {
        const { device_id } = req.params;

        const result = await pool.query(`
            SELECT 
                p.*,
                dp.assigned_at,
                pe.last_execution,
                pe.last_status
            FROM policies p
            INNER JOIN device_policies dp ON p.id = dp.policy_id
            LEFT JOIN LATERAL (
                SELECT 
                    executed_at as last_execution,
                    status as last_status
                FROM policy_executions
                WHERE device_id = $1 AND policy_id = p.id
                ORDER BY executed_at DESC
                LIMIT 1
            ) pe ON true
            WHERE dp.device_id = $1 AND p.enabled = true
            ORDER BY p.priority DESC, p.name
        `, [device_id]);

        res.json({ success: true, policies: result.rows });
    } catch (error) {
        console.error('Erro ao buscar políticas:', error);
        res.status(500).json({ success: false, message: error.message });
    }
});

// Listar templates de políticas disponíveis
router.get('/templates', async (req, res) => {
    try {
        const { category } = req.query;

        let sqlQuery = 'SELECT * FROM policy_templates';
        const params = [];

        if (category) {
            sqlQuery += ' WHERE category = $1';
            params.push(category);
        }

        sqlQuery += ' ORDER BY category, name';

        const result = await query(sqlQuery, params);

        res.json({ success: true, templates: result.rows });
    } catch (error) {
        console.error('Erro ao buscar templates:', error);
        res.status(500).json({ success: false, message: error.message });
    }
});

// Estatísticas de comandos por dispositivo
router.get('/stats/:device_id', async (req, res) => {
    try {
        const { device_id } = req.params;

        const stats = await pool.query(`
            SELECT 
                COUNT(*) FILTER (WHERE status = 'pending') as pending,
                COUNT(*) FILTER (WHERE status = 'sent') as sent,
                COUNT(*) FILTER (WHERE status = 'executing') as executing,
                COUNT(*) FILTER (WHERE status = 'success') as success,
                COUNT(*) FILTER (WHERE status = 'failed') as failed
            FROM policy_commands
            WHERE device_id = $1
            AND created_at > NOW() - INTERVAL '7 days'
        `, [device_id]);

        const recentExecutions = await pool.query(`
            SELECT 
                status,
                COUNT(*) as count
            FROM policy_executions
            WHERE device_id = $1
            AND executed_at > NOW() - INTERVAL '30 days'
            GROUP BY status
        `, [device_id]);

        res.json({
            success: true,
            commands: stats.rows[0],
            recent_executions: recentExecutions.rows
        });
    } catch (error) {
        console.error('Erro ao buscar estatísticas:', error);
        res.status(500).json({ success: false, message: error.message });
    }
});

module.exports = router;