<?php
header('Content-Type: application/json');
require_once __DIR__ . '/../db/config.php';

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    echo json_encode(['error' => 'Method not allowed']);
    exit;
}

$input = json_decode(file_get_contents('php://input'), true);

$name = trim($input['name'] ?? '');
$phone = trim($input['phone'] ?? '');

if (empty($name)) {
    echo json_encode(['error' => 'Name is required']);
    exit;
}

// Relaxed phone validation: 8 to 15 digits
if (!preg_match('/^\d{8,15}$/', $phone)) {
    echo json_encode(['error' => 'Phone number must be between 8 and 15 digits']);
    exit;
}

try {
    $pdo = db();
    
    // Check if phone already exists
    $stmt = $pdo->prepare("SELECT id FROM customers WHERE phone = ?");
    $stmt->execute([$phone]);
    if ($stmt->fetch()) {
        echo json_encode(['error' => 'Customer with this phone number already exists']);
        exit;
    }

    $stmt = $pdo->prepare("INSERT INTO customers (name, phone, points) VALUES (?, ?, 0)");
    if ($stmt->execute([$name, $phone])) {
        $id = $pdo->lastInsertId();
        
        // Fetch settings for consistency (though new customer is 0 points)
        $settingsStmt = $pdo->query("SELECT points_for_free_meal FROM loyalty_settings WHERE id = 1");
        $settings = $settingsStmt->fetch(PDO::FETCH_ASSOC);
        $threshold = $settings ? intval($settings['points_for_free_meal']) : 70;

        // --- Send Welcome WhatsApp Message via Wablas ---
        try {
            require_once __DIR__ . '/../includes/WablasService.php';
            $wablas = new WablasService($pdo);
            
            $companyStmt = $pdo->query("SELECT company_name FROM company_settings LIMIT 1");
            $companyName = $companyStmt->fetchColumn() ?: 'Our Restaurant';
            
            // Fetch welcome template
            $templateStmt = $pdo->query("SELECT setting_value FROM integration_settings WHERE provider='wablas' AND setting_key='welcome_template'");
            $welcomeTemplate = $templateStmt->fetchColumn();
            
            if (empty($welcomeTemplate)) {
                $welcomeTemplate = "Welcome *{customer_name}* to *{company_name}*! 🎉\n\nThank you for registering. You can now earn loyalty points with every order!\n\nYou currently have 0 points. Collect {points_threshold} points to earn a free meal!";
            }
            
            $welcomeMsg = str_replace(
                ['{customer_name}', '{company_name}', '{points_threshold}'],
                [$name, $companyName, $threshold],
                $welcomeTemplate
            );

            
            $wablas->sendMessage($phone, $welcomeMsg);
        } catch (Exception $w) {
            error_log("Wablas Welcome Msg Exception: " . $w->getMessage());
        }

        echo json_encode([
            'success' => true,
            'customer' => [
                'id' => $id,
                'name' => $name,
                'phone' => $phone,
                'email' => '',
                'points' => 0,
                'eligible_for_free_meal' => false,
                'points_needed' => $threshold
            ]
        ]);
    } else {
        echo json_encode(['error' => 'Failed to create customer']);
    }
} catch (Exception $e) {
    error_log("Create Customer Error: " . $e->getMessage());
    echo json_encode(['error' => 'Database error']);
}