<?php
require_once 'includes/db.php';

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

$id = $_GET['id'] ?? null;

try {
    if ($id) {
        // 按 ID 下载指定版本
        $stmt = $db->prepare("SELECT * FROM apps WHERE id = ?");
        $stmt->execute([$id]);
        $app = $stmt->fetch(PDO::FETCH_ASSOC);

        if ($app && file_exists('data/apps/' . $app['filename'])) {
            echo json_encode([
                'success' => true,
                'file' => 'data/apps/' . rawurlencode($app['filename']),
                'filename' => $app['original_name'],
                'version' => $app['version'],
                'date' => date('Y-m-d H:i:s', strtotime($app['upload_time']))
            ]);
        } else {
            echo json_encode([
                'success' => false,
                'message' => 'APK 文件不存在'
            ]);
        }
    } else {
        // 兼容旧版：返回最新版本
        $stmt = $db->query("SELECT * FROM apps ORDER BY upload_time DESC LIMIT 1");
        $app = $stmt->fetch(PDO::FETCH_ASSOC);

        if ($app && file_exists('data/apps/' . $app['filename'])) {
            echo json_encode([
                'success' => true,
                'file' => 'data/apps/' . rawurlencode($app['filename']),
                'filename' => $app['original_name'],
                'version' => $app['version'],
                'date' => date('Y-m-d H:i:s', strtotime($app['upload_time']))
            ]);
        } else {
            echo json_encode([
                'success' => false,
                'message' => '未找到 APK 文件'
            ]);
        }
    }
} catch (Exception $e) {
    echo json_encode([
        'success' => false,
        'message' => '查询失败: ' . $e->getMessage()
    ]);
}