<?php
// update_booking.php - 处理预约更新功能
require_once 'db_connect.php';

// 只接受POST请求
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    header('HTTP/1.1 405 Method Not Allowed');
    echo json_encode(['status' => 'error', 'message' => '只允许POST请求']);
    exit;
}

// 检查必要的参数
if (!isset($_POST['booking_id']) || !isset($_POST['action'])) {
    echo json_encode(['status' => 'error', 'message' => '缺少必要参数']);
    exit;
}

$booking_id = $_POST['booking_id'];
$action = $_POST['action'];
$response = ['status' => 'error', 'message' => '未知操作'];

try {
    // 验证预约ID是否存在
    $stmt = $pdo->prepare("SELECT id FROM bookings WHERE id = ?");
    $stmt->execute([$booking_id]);
    if ($stmt->rowCount() === 0) {
        $response['message'] = '预约不存在';
        echo json_encode($response);
        exit;
    }
    
    if (in_array($action, ['已确认', '已完成', '已取消'])) {
        // 更新预约状态
        $stmt = $pdo->prepare("UPDATE bookings SET status = ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?");
        $stmt->execute([$action, $booking_id]);
        $response = ['status' => 'success', 'message' => '预约状态更新成功！'];
    } elseif (in_array($action, ['已付款', '未付款'])) {
        // 更新付款状态
        $stmt = $pdo->prepare("UPDATE bookings SET payment_status = ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?");
        $stmt->execute([$action, $booking_id]);
        $response = ['status' => 'success', 'message' => '付款状态更新成功！'];
    } elseif ($action == 'update_time' && isset($_POST['new_start_time']) && isset($_POST['new_end_time'])) {
        // 更新预约时间
        $new_start_time = $_POST['new_start_time'];
        $new_end_time = $_POST['new_end_time'];
        
        // 验证时间有效性
        $start_dt = new DateTime($new_start_time);
        $end_dt = new DateTime($new_end_time);
        $now = new DateTime();
        
        if ($start_dt < $now) {
            $response['message'] = '开始时间不能早于当前时间';
            echo json_encode($response);
            exit;
        }
        
        if ($end_dt <= $start_dt) {
            $response['message'] = '结束时间必须晚于开始时间';
            echo json_encode($response);
            exit;
        }
        
        // 计算新的持续时间（分钟）
        $duration = $start_dt->diff($end_dt)->i + ($start_dt->diff($end_dt)->h * 60);
        
        // 更新预约时间和持续时间
        $stmt = $pdo->prepare("UPDATE bookings SET start_time = ?, end_time = ?, duration = ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?");
        $stmt->execute([$new_start_time, $new_end_time, $duration, $booking_id]);
        $response = ['status' => 'success', 'message' => '预约时间更新成功！'];
    }
} catch (Exception $e) {
    $response['message'] = '操作失败：' . $e->getMessage();
}

echo json_encode($response);
?>