process.php

<?php
// 减肥记录管理系统 - 表单处理文件

// 启用详细错误报告
error_reporting(E_ALL);
ini_set('display_errors', 0); // AJAX请求时不显示错误
ini_set('log_errors', 1);
ini_set('error_log', __DIR__ . '/error.log');

// 设置响应头为JSON
header('Content-Type: application/json; charset=utf-8');

session_start();
require_once 'config.php';
require_once 'includes/WeightService.php';
require_once 'Security.class.php';

// 初始化服务
$service = new WeightService();
$service->initialize();

// 处理不同的操作
if (isset($_POST['action'])) {
    $action = $_POST['action'];
    
    switch ($action) {
        case 'add_record':
            handleAddRecord($service);
            break;
        case 'update_record':
            handleUpdateRecord($service);
            break;
        case 'delete_record':
            handleDeleteRecord($service);
            break;
        default:
            setError('无效的操作');
            break;
    }
} else {
    setError('未指定操作');
}

/**
 * 处理添加记录
 */
function handleAddRecord($service) {
    // 验证输入数据
    if ((!isset($_POST['morning_date']) && !isset($_POST['evening_date'])) || 
        (!isset($_POST['morning_weight']) && !isset($_POST['evening_weight']))) {
        setError('缺少必要参数');
        return;
    }
    
    // 根据提交的表单确定日期
    $date = trim(isset($_POST['morning_date']) ? $_POST['morning_date'] : $_POST['evening_date']);
    
    // 获取体重数据，如果未提供则设为0
    $morningWeight = isset($_POST['morning_weight']) ? floatval($_POST['morning_weight']) : 0;
    $eveningWeight = isset($_POST['evening_weight']) ? floatval($_POST['evening_weight']) : 0;
    
    // 数据验证
    if (empty($date) || !Security::validateDate($date)) {
        setError('日期格式无效');
        return;
    }
    
    // 检查至少有一个体重值大于0
    if ($morningWeight <= 0 && $eveningWeight <= 0) {
        setError('至少需要填写一个体重值，且必须大于0');
        return;
    }
    
    if (($morningWeight > 0 && !Security::validateWeight($morningWeight)) || 
        ($eveningWeight > 0 && !Security::validateWeight($eveningWeight))) {
        setError('体重值无效，请检查输入');
        return;
    }
    
    // 添加记录
    if ($service->addRecord($date, $morningWeight, $eveningWeight)) {
        $records = $service->getAllRecords();
        $stats = $service->getStatistics($records);
        setSuccessWithData('体重记录保存成功', $records, $stats);
    } else {
        setError('保存体重记录失败');
    }
}

/**
 * 处理更新记录
 */
function handleUpdateRecord($service) {
    if (!isset($_POST['id']) || !isset($_POST['record_date']) || !isset($_POST['morning_weight']) || !isset($_POST['evening_weight'])) {
        setError('缺少必要参数');
        return;
    }
    
    $id = intval($_POST['id']);
    $date = trim($_POST['record_date']);
    $morningWeight = floatval($_POST['morning_weight']);
    $eveningWeight = floatval($_POST['evening_weight']);
    
    // 数据验证
    if ($id <= 0) {
        setError('无效的记录ID');
        return;
    }
    
    if (empty($date) || !Security::validateDate($date)) {
        setError('日期格式无效');
        return;
    }
    
    if ($morningWeight <= 0 && $eveningWeight <= 0) {
        setError('至少需要填写一个体重值，且必须大于0');
        return;
    }
    
    if (($morningWeight > 0 && !Security::validateWeight($morningWeight)) || 
        ($eveningWeight > 0 && !Security::validateWeight($eveningWeight))) {
        setError('体重值无效，请检查输入');
        return;
    }
    
    // 更新记录
    if ($service->updateRecord($id, $date, $morningWeight, $eveningWeight)) {
        $records = $service->getAllRecords();
        $stats = $service->getStatistics($records);
        setSuccessWithData('体重记录更新成功', $records, $stats);
    } else {
        setError('更新体重记录失败');
    }
}

/**
 * 处理删除记录
 */
function handleDeleteRecord($service) {
    if (!isset($_POST['id'])) {
        setError('缺少必要参数');
        return;
    }
    
    $id = intval($_POST['id']);
    
    if ($id <= 0) {
        setError('无效的记录ID');
        return;
    }
    
    // 删除记录
    if ($service->deleteRecord($id)) {
        $records = $service->getAllRecords();
        $stats = $service->getStatistics($records);
        setSuccessWithData('体重记录删除成功', $records, $stats);
    } else {
        setError('删除体重记录失败');
    }
}

/**
 * 设置成功消息并返回JSON响应（带数据）
 */
function setSuccessWithData($message, $records, $stats) {
    jsonResponseWithData(true, $message, $records, $stats);
}

/**
 * 返回JSON响应（带数据）
 */
function jsonResponseWithData($success, $message, $records = null, $stats = null) {
    $response = [
        'success' => $success,
        'message' => $message
    ];

    // 如果有数据，添加到响应中
    if ($records !== null) {
        $response['records'] = $records;
    }

    if ($stats !== null) {
        $response['stats'] = $stats;
    }

    echo json_encode($response, JSON_UNESCAPED_UNICODE);
    exit();
}

/**
 * 返回JSON响应
 */
function jsonResponse($success, $message) {
    echo json_encode([
        'success' => $success,
        'message' => $message
    ], JSON_UNESCAPED_UNICODE);
    exit();
}

/**
 * 设置成功消息并返回JSON响应
 */
function setSuccess($message) {
    $_SESSION['success_message'] = $message;
    $_SESSION['message_type'] = 'success';
    jsonResponse(true, $message);
}

/**
 * 设置错误消息并返回JSON响应
 */
function setError($message) {
    $_SESSION['error_message'] = $message;
    $_SESSION['message_type'] = 'error';
    jsonResponse(false, $message);
}
?>