using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace 報到系統.Forms
{
    public partial class Home : PageBase
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        public string LatestClientPackage() 
        {
            var latestClientPackage = GetLatestClientPackageFileName();
            if (!string.IsNullOrEmpty(latestClientPackage))
            {
                return ResolveUrlWithSysVer(string.Format("~/Assets/Downloads/{0}", latestClientPackage));
            }
            return string.Empty;
        }

        /// <summary>
        /// 取得最新的客戶端安裝包檔案名稱
        /// 從 Assets/Downloads 目錄下查找 "報到系統客戶端_*.zip" 檔案
        /// 按檔名排序取最大的那一個
        /// </summary>
        private string GetLatestClientPackageFileName()
        {
            try
            {
                string downloadDir = Server.MapPath("~/Assets/Downloads/");
                
                if (!Directory.Exists(downloadDir))
                {
                    return string.Empty;
                }

                DirectoryInfo dirInfo = new DirectoryInfo(downloadDir);
                FileInfo[] files = dirInfo.GetFiles("報到系統客戶端_*.zip");
                
                if (files.Length == 0)
                {
                    return string.Empty;
                }

                // 按檔名排序，取最後一個（最大的那個）
                string latestFileName = files.OrderBy(f => f.Name).LastOrDefault()?.Name;
                
                return latestFileName ?? string.Empty;
            }
            catch
            {
                return string.Empty;
            }
        }
    }
}