<?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;

        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']);
}