<?php
/**
 * 邮件统计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();
    
    // 只支持GET请求
    if ($method === 'GET') {
        // 获取统计类型
        $type = isset($_GET['type']) ? $_GET['type'] : 'mail';
        
        switch ($type) {
            case 'mail':
                // 获取邮件统计
                getMailStats($db);
                break;
            case 'traffic':
                // 获取流量统计
                getTrafficStats($db);
                break;
            case 'send':
                // 获取发送统计
                getSendStats($db);
                break;
            default:
                echo json_encode([
                    'success' => false,
                    'message' => '不支持的统计类型' . $type
                ]);
                break;
        }
    } else {
        echo json_encode([
            'success' => false,
            'message' => '不支持的请求方法' . $method
        ]);
    }
} catch (Exception $e) {
    echo json_encode([
        'success' => false,
        'message' => '服务器内部错误: ' . $e->getMessage()
    ]);
}

/**
 * 获取邮件统计
 * @param Database $db 数据库实例
 */
function getMailStats($db) {
    // 获取请求参数
    $username = isset($_GET['username']) ? $_GET['username'] : '';
    $startDate = isset($_GET['startDate']) ? $_GET['startDate'] : '';
    $endDate = isset($_GET['endDate']) ? $_GET['endDate'] : '';
    
    // 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;
    }
    
    // 构建查询条件
    $where = "WHERE (rcpt_to = ? OR `from` = ?)";
    $params = [$user['email'], $user['email']];
    
    if (!empty($startDate)) {
        $where .= " AND date >= ?";
        $params[] = $startDate . " 00:00:00";
    }
    
    if (!empty($endDate)) {
        $where .= " AND date <= ?";
        $params[] = $endDate . " 23:59:59";
    }
    
    // 获取邮件类型统计
    $typeStats = [
        'inbox' => $db->fetchOne("SELECT COUNT(*) as count FROM email $where AND folder = 'inbox' AND is_deleted = 0", $params)['count'],
        'sent' => $db->fetchOne("SELECT COUNT(*) as count FROM email $where AND folder = 'sent' AND is_deleted = 0", $params)['count'],
        'draft' => $db->fetchOne("SELECT COUNT(*) as count FROM email $where AND folder = 'draft' AND is_deleted = 0", $params)['count'],
        'trash' => $db->fetchOne("SELECT COUNT(*) as count FROM email $where AND folder = 'trash' AND is_deleted = 1", $params)['count'],
        'total' => $db->fetchOne("SELECT COUNT(*) as count FROM email $where", $params)['count']
    ];
    
    // 获取阅读状态统计
    $readStats = [
        'read' => $db->fetchOne("SELECT COUNT(*) as count FROM email WHERE rcpt_to = ? AND is_read = 1 AND is_deleted = 0", [$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']
    ];
    
    echo json_encode([
        'success' => true,
        'data' => [
            'typeStats' => $typeStats,
            'readStats' => $readStats
        ]
    ]);
}

/**
 * 获取流量统计
 * @param Database $db 数据库实例
 */
function getTrafficStats($db) {
    // 获取请求参数
    $username = isset($_GET['username']) ? $_GET['username'] : '';
    $startDate = isset($_GET['startDate']) ? $_GET['startDate'] : '';
    $endDate = isset($_GET['endDate']) ? $_GET['endDate'] : '';
    
    // 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;
    }
    
    // 构建查询条件
    $where = "WHERE (rcpt_to = ? OR `from` = ?)";
    $params = [$user['email'], $user['email']];
    
    if (!empty($startDate)) {
        $where .= " AND date >= ?";
        $params[] = $startDate . " 00:00:00";
    }
    
    if (!empty($endDate)) {
        $where .= " AND date <= ?";
        $params[] = $endDate . " 23:59:59";
    }
    
    // 获取邮件大小统计
    $sizeStats = $db->fetchOne("SELECT SUM(length) as total_size FROM email $where", $params);
    
    // 获取邮箱配额
    $quota = $db->fetchOne("SELECT quota_bytes, used_bytes FROM mailboxes WHERE username = ?", [$username]);
    if (!$quota) {
        $quota = [
            'quota_bytes' => 1073741824, // 1GB默认配额
            'used_bytes' => 0
        ];
    }
    
    echo json_encode([
        'success' => true,
        'data' => [
            'totalSize' => $sizeStats['total_size'] ?: 0,
            'quota' => $quota['quota_bytes'],
            'used' => $quota['used_bytes'],
            'remaining' => $quota['quota_bytes'] - $quota['used_bytes']
        ]
    ]);
}

/**
 * 获取发送统计
 * @param Database $db 数据库实例
 */
function getSendStats($db) {
    // 获取请求参数
    $username = isset($_GET['username']) ? $_GET['username'] : '';
    $startDate = isset($_GET['startDate']) ? $_GET['startDate'] : '';
    $endDate = isset($_GET['endDate']) ? $_GET['endDate'] : '';
    
    // 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;
    }
    
    // 构建查询条件
    $where = "WHERE `from` = ? AND folder = 'sent' AND is_deleted = 0";
    $params = [$user['email']];
    
    if (!empty($startDate)) {
        $where .= " AND date >= ?";
        $params[] = $startDate . " 00:00:00";
    }
    
    if (!empty($endDate)) {
        $where .= " AND date <= ?";
        $params[] = $endDate . " 23:59:59";
    }
    
    // 获取发送总量
    $totalSent = $db->fetchOne("SELECT COUNT(*) as count FROM email $where", $params)['count'];
    
    // 获取每日发送统计
    $dailyStats = [];
    
    // 构建每日统计查询
    $dailyQuery = "SELECT DATE(date) as date, COUNT(*) as count FROM email $where GROUP BY DATE(date) ORDER BY date ASC";
    $dailyResult = $db->fetchAll($dailyQuery, $params);
    
    if ($dailyResult) {
        foreach ($dailyResult as $row) {
            $dailyStats[] = [
                'date' => $row['date'],
                'count' => $row['count']
            ];
        }
    }
    
    echo json_encode([
        'success' => true,
        'data' => [
            'totalSent' => $totalSent,
            'dailyStats' => $dailyStats
        ]
    ]);
}