<?php
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');
if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') { http_response_code(204); exit; }
if ($_SERVER['REQUEST_METHOD'] !== 'POST') { echo json_encode(['ok'=>false,'error'=>'POST required']); exit; }

$data = json_decode(file_get_contents('php://input'), true);
if (!$data) { echo json_encode(['ok'=>false,'error'=>'Invalid JSON']); exit; }

$name = trim($data['name'] ?? '');
$email = trim($data['email'] ?? '');
$company = trim($data['company'] ?? '');
$date = trim($data['date'] ?? '');
$slot = trim($data['slot'] ?? '');
$duration = intval($data['duration'] ?? 30);
$subject = trim($data['subject'] ?? 'Consultation');
$message = trim($data['message'] ?? '');

if (!$name || !$email || !$date || !$slot) {
    echo json_encode(['ok'=>false,'error'=>'Champs requis: nom, email, date, créneau']);
    exit;
}

// Build email
$to = 'info@weval-consulting.com';
$mail_subject = "RDV WEVAL — {$subject} — {$date} {$slot}";
$body = "Nouvelle demande de rendez-vous\n";
$body .= "========================================\n\n";
$body .= "Nom:        {$name}\n";
$body .= "Email:      {$email}\n";
$body .= "Entreprise: {$company}\n";
$body .= "Date:       {$date} à {$slot}\n";
$body .= "Durée:      {$duration} min\n";
$body .= "Sujet:      {$subject}\n";
if ($message) $body .= "Message:    {$message}\n";
$body .= "\n========================================\n";
$body .= "Source: weval-consulting.com/booking.html\n";
$body .= "IP: " . ($_SERVER['REMOTE_ADDR'] ?? 'unknown') . "\n";
$body .= "Date: " . date('Y-m-d H:i:s') . "\n";

$headers = "From: WEVAL Booking <noreply@weval-consulting.com>\r\n";
$headers .= "Reply-To: {$email}\r\n";
$headers .= "X-Mailer: WEVAL-Booking/1.0\r\n";

// Send via local mail()
$sent = @mail($to, $mail_subject, $body, $headers);

// Also log to file
$log = date('Y-m-d H:i:s') . " | {$name} | {$email} | {$company} | {$date} {$slot} | {$duration}min | {$subject}\n";
@file_put_contents('/var/log/weval-booking.log', $log, FILE_APPEND);

// Send confirmation to client
if ($sent) {
    $conf_subject = "Confirmation — Rendez-vous WEVAL Consulting";
    $conf_body = "Bonjour {$name},\n\n";
    $conf_body .= "Nous avons bien reçu votre demande de rendez-vous :\n\n";
    $conf_body .= "Date : {$date} à {$slot}\n";
    $conf_body .= "Durée : {$duration} minutes\n";
    $conf_body .= "Sujet : {$subject}\n\n";
    $conf_body .= "Nous vous confirmerons le créneau sous 24h.\n\n";
    $conf_body .= "Cordialement,\nWEVAL Consulting\ninfo@weval-consulting.com";
    $conf_headers = "From: WEVAL Consulting <info@weval-consulting.com>\r\n";
    @mail($email, $conf_subject, $conf_body, $conf_headers);
}

echo json_encode(['ok' => true, 'message' => 'Demande envoyée']);