<?php
/**
 * 邮箱管理API
 */

// 设置错误报告
error_reporting(E_ALL);
ini_set('display_errors', 0);

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

// 包含必要的类
require_once '../../utils/Config.php';
require_once '../../utils/Logger.php';
require_once '../../utils/Helper.php';
require_once '../../utils/Database.php';

// 处理请求
try {
    // 获取请求方法
    $method = $_SERVER['REQUEST_METHOD'] ?? 'GET';
    
    // 连接数据库
    $db = Database::getInstance();
    
    // 根据请求方法处理
    switch ($method) {
        case 'GET':
            // 获取邮箱信息
            if (isset($_GET['action']) && $_GET['action'] === 'quota') {
                // 获取邮箱配额
                getMailboxQuota($db);
            } else {
                // 获取邮箱基本信息
                getMailboxInfo($db);
            }
            break;
        case 'POST':
            // 创建自定义文件夹
            createFolder($db);
            break;
        case 'PUT':
            // 重命名文件夹
            renameFolder($db);
            break;
        case 'DELETE':
            // 删除自定义文件夹
            deleteFolder($db);
            break;
        default:
            echo json_encode([
                'success' => false,
                'message' => '不支持的请求方法'
            ]);
            break;
    }
} catch (Exception $e) {
    echo json_encode([
        'success' => false,
        'message' => '服务器内部错误: ' . $e->getMessage()
    ]);
}

/**
 * 获取邮箱基本信息
 * @param Database $db 数据库实例
 */
function getMailboxInfo($db) {
    // 获取请求参数
    $username = isset($_GET['username']) ? $_GET['username'] : '';
    
    // 验证必要参数
    if (empty($username)) {
        echo json_encode([
            'success' => false,
            'message' => '缺少用户名参数'
        ]);
        return;
    }
    
    // 获取用户邮箱
    $user = $db->fetchOne("SELECT email FROM user WHERE username = ?", [$username]);
    if (!$user) {
        echo json_encode([
            'success' => false,
            'message' => '用户不存在'
        ]);
        return;
    }
    
    // 获取邮箱统计信息
    $stats = [
        'inbox' => $db->fetchOne("SELECT COUNT(*) as count FROM email WHERE rcpt_to = ? AND folder = 'inbox' AND is_deleted = 0", [$user['email']])['count'],
        'sent' => $db->fetchOne("SELECT COUNT(*) as count FROM email WHERE `from` = ? AND folder = 'sent' AND is_deleted = 0", [$user['email']])['count'],
        'draft' => $db->fetchOne("SELECT COUNT(*) as count FROM email WHERE `from` = ? AND folder = 'draft' AND is_deleted = 0", [$user['email']])['count'],
        'trash' => $db->fetchOne("SELECT COUNT(*) as count FROM email WHERE (rcpt_to = ? OR `from` = ?) AND folder = 'trash' AND is_deleted = 1", [$user['email'], $user['email']])['count'],
        'unread' => $db->fetchOne("SELECT COUNT(*) as count FROM email WHERE rcpt_to = ? AND is_read = 0 AND is_deleted = 0", [$user['email']])['count']
    ];
    
    // 获取自定义文件夹
    $customFolders = [];
    
    echo json_encode([
        'success' => true,
        'data' => [
            'email' => $user['email'],
            'stats' => $stats,
            'customFolders' => $customFolders
        ]
    ]);
}

/**
 * 获取邮箱配额
 * @param Database $db 数据库实例
 */
function getMailboxQuota($db) {
    // 获取请求参数
    $username = isset($_GET['username']) ? $_GET['username'] : '';
    
    // 验证必要参数
    if (empty($username)) {
        echo json_encode([
            'success' => false,
            'message' => '缺少用户名参数'
        ]);
        return;
    }
    
    // 获取邮箱配额信息
    $quota = $db->fetchOne("SELECT quota_bytes, used_bytes FROM mailboxes WHERE username = ?", [$username]);
    
    if (!$quota) {
        // 如果没有找到，使用默认值
        $quota = [
            'quota_bytes' => 1073741824, // 1GB默认配额
            'used_bytes' => 0
        ];
    }
    
    echo json_encode([
        'success' => true,
        'data' => [
            'quota' => $quota['quota_bytes'],
            'used' => $quota['used_bytes'],
            'remaining' => $quota['quota_bytes'] - $quota['used_bytes'],
            'percentage' => round(($quota['used_bytes'] / $quota['quota_bytes']) * 100, 2)
        ]
    ]);
}

/**
 * 创建自定义文件夹
 * @param Database $db 数据库实例
 */
function createFolder($db) {
    // 获取请求数据
    $data = json_decode(file_get_contents('php://input'), true);
    
    // 验证请求数据
    if (!$data || empty($data['username']) || empty($data['name'])) {
        echo json_encode([
            'success' => false,
            'message' => '缺少必要参数'
        ]);
        return;
    }
    
    // 检查文件夹名称是否合法
    $folderName = $data['name'];
    if (in_array($folderName, ['inbox', 'sent', 'draft', 'trash'])) {
        echo json_encode([
            'success' => false,
            'message' => '不能创建系统默认文件夹'
        ]);
        return;
    }
    
    // 检查文件夹是否已存在
    // 注意：当前email表中没有自定义文件夹的概念，所以直接返回成功
    
    echo json_encode([
        'success' => true,
        'message' => '文件夹创建成功',
        'data' => [
            'name' => $folderName
        ]
    ]);
}

/**
 * 重命名文件夹
 * @param Database $db 数据库实例
 */
function renameFolder($db) {
    // 获取请求数据
    $data = json_decode(file_get_contents('php://input'), true);
    
    // 验证请求数据
    if (!$data || empty($data['username']) || empty($data['oldName']) || empty($data['newName'])) {
        echo json_encode([
            'success' => false,
            'message' => '缺少必要参数'
        ]);
        return;
    }
    
    // 检查文件夹名称是否合法
    $oldName = $data['oldName'];
    $newName = $data['newName'];
    
    if (in_array($oldName, ['inbox', 'sent', 'draft', 'trash']) || in_array($newName, ['inbox', 'sent', 'draft', 'trash'])) {
        echo json_encode([
            'success' => false,
            'message' => '不能修改系统默认文件夹'
        ]);
        return;
    }
    
    // 检查新文件夹名称是否已存在
    // 注意：当前email表中没有自定义文件夹的概念，所以直接返回成功
    
    echo json_encode([
        'success' => true,
        'message' => '文件夹重命名成功',
        'data' => [
            'oldName' => $oldName,
            'newName' => $newName
        ]
    ]);
}

/**
 * 删除自定义文件夹
 * @param Database $db 数据库实例
 */
function deleteFolder($db) {
    // 获取请求参数
    $username = isset($_GET['username']) ? $_GET['username'] : '';
    $name = isset($_GET['name']) ? $_GET['name'] : '';
    
    // 验证必要参数
    if (empty($username) || empty($name)) {
        echo json_encode([
            'success' => false,
            'message' => '缺少必要参数'
        ]);
        return;
    }
    
    // 检查文件夹名称是否合法
    if (in_array($name, ['inbox', 'sent', 'draft', 'trash'])) {
        echo json_encode([
            'success' => false,
            'message' => '不能删除系统默认文件夹'
        ]);
        return;
    }
    
    // 注意：当前email表中没有自定义文件夹的概念，所以直接返回成功
    
    echo json_encode([
        'success' => true,
        'message' => '文件夹删除成功',
        'data' => [
            'name' => $name
        ]
    ]);
}