Webhooks

<?php
// webhook-handler.php

header('Content-Type: application/json');

// Configuración
$webhookSecret = 'tu-webhook-secret'; // Deja vacío si no usas firma

// Obtener datos
$payload = file_get_contents('php://input');
$signature = $_SERVER['HTTP_X_WEBHOOK_SIGNATURE'] ?? '';
$timestamp = $_SERVER['HTTP_X_WEBHOOK_TIMESTAMP'] ?? '';
$eventType = $_SERVER['HTTP_X_WEBHOOK_EVENT'] ?? '';

// Verificar firma (si hay secret configurado)
if ($webhookSecret) {
    $expectedSignature = hash_hmac(
        'sha256',
        $timestamp . '.' . $payload,
        $webhookSecret
    );

    if (!hash_equals($expectedSignature, $signature)) {
        http_response_code(401);
        echo json_encode(['error' => 'Invalid signature']);
        exit;
    }

    // Verificar timestamp (máximo 5 minutos de antigüedad)
    if (abs(time() - intval($timestamp)) > 300) {
        http_response_code(401);
        echo json_encode(['error' => 'Timestamp too old']);
        exit;
    }
}

// Decodificar payload
$data = json_decode($payload, true);

// Procesar según tipo de evento
switch ($eventType) {
    case 'phone.detected':
        $phone = $data['phone'];
        $shopId = $data['shop_id'];

        // Guardar en tu base de datos, CRM, etc.
        guardarNuevoLead($phone, $shopId);

        echo json_encode(['status' => 'ok', 'message' => 'Lead saved']);
        break;

    case 'followup.detected':
        // Seguimiento Inteligente: cliente con intención detectada
        $phone = $data['phone'];
        $intentLevel = $data['intent_level']; // "high" o "medium"
        $product = $data['product_mentioned'] ?? null;
        $suggestedMsg = $data['suggested_message'] ?? null;

        // Ejemplo: crear tarea en tu CRM
        procesarSeguimiento($phone, $intentLevel, $product, $suggestedMsg);

        echo json_encode(['status' => 'ok', 'message' => 'Follow-up processed']);
        break;

    case 'test':
        // Evento de prueba
        echo json_encode(['status' => 'ok', 'message' => 'Test received']);
        break;

    default:
        echo json_encode(['status' => 'ok', 'message' => 'Event not handled']);
}

function guardarNuevoLead($phone, $shopId) {
    // Tu lógica aquí: guardar en BD, enviar a CRM, etc.
    error_log("Nuevo lead: $phone de shop $shopId");
}

function procesarSeguimiento($phone, $intentLevel, $product, $suggestedMsg) {
    // Tu lógica aquí: crear tarea, notificar al equipo, etc.
    error_log("Follow-up $intentLevel: $phone" . ($product ? " - $product" : ""));
}

const express = require('express');
const crypto = require('crypto');

const app = express();
const WEBHOOK_SECRET = 'tu-webhook-secret'; // Deja vacío si no usas firma

// Middleware para raw body
app.use('/webhook', express.raw({ type: 'application/json' }));

app.post('/webhook', (req, res) => {
    const payload = req.body.toString();
    const signature = req.headers['x-webhook-signature'] || '';
    const timestamp = req.headers['x-webhook-timestamp'] || '';
    const eventType = req.headers['x-webhook-event'] || '';

    // Verificar firma (si hay secret)
    if (WEBHOOK_SECRET) {
        const expectedSignature = crypto
            .createHmac('sha256', WEBHOOK_SECRET)
            .update(`${timestamp}.${payload}`)
            .digest('hex');

        const sigBuffer = Buffer.from(signature);
        const expectedBuffer = Buffer.from(expectedSignature);

        if (sigBuffer.length !== expectedBuffer.length ||
            !crypto.timingSafeEqual(sigBuffer, expectedBuffer)) {
            return res.status(401).json({ error: 'Invalid signature' });
        }

        // Verificar timestamp
        if (Math.abs(Date.now() / 1000 - parseInt(timestamp)) > 300) {
            return res.status(401).json({ error: 'Timestamp too old' });
        }
    }

    const data = JSON.parse(payload);

    // Procesar evento
    switch (eventType) {
        case 'phone.detected':
            console.log(`Nuevo lead: ${data.phone} de shop ${data.shop_id}`);
            // Tu lógica aquí
            break;

        case 'followup.detected':
            console.log(`Follow-up ${data.intent_level}: ${data.phone}`);
            if (data.product_mentioned) console.log(`Producto: ${data.product_mentioned}`);
            // Crear tarea en tu CRM, notificar al equipo, etc.
            break;

        case 'test':
            console.log('Test webhook received');
            break;
    }

    res.json({ status: 'ok' });
});

app.listen(3000, () => console.log('Webhook server running on port 3000'));