#if UNITY_EDITOR_WIN || UNITY_STANDALONE_WIN
using System.Runtime.InteropServices;
using System.Text;
#endif
using UnityEngine;

namespace AibisDream.Utility
{
    /// <summary>
    /// 打开游戏的 Steam 商店页面。
    /// </summary>
    public static class SteamStoreUtility
    {
#if UNITY_EDITOR_WIN || UNITY_STANDALONE_WIN
        private const uint AssocStrCommand = 1;
        private const int S_OK = 0;

        [DllImport("Shlwapi.dll", CharSet = CharSet.Unicode)]
        private static extern int AssocQueryString(
            uint flags,
            uint str,
            string association,
            string extra,
            StringBuilder output,
            ref uint outputLength);
#endif

        /// <summary>
        /// Windows 下优先使用 Steam 客户端；Steam 协议不可用时回退到网页商店。
        /// </summary>
        public static void OpenWishlistPage()
        {
#if UNITY_EDITOR_WIN || UNITY_STANDALONE_WIN
            if (IsSteamProtocolRegistered())
            {
                Application.OpenURL(ConstRef.SteamWishlistURL);
                return;
            }
#endif

            Application.OpenURL(ConstRef.WishlistURL);
        }

#if UNITY_EDITOR_WIN || UNITY_STANDALONE_WIN
        private static bool IsSteamProtocolRegistered()
        {
            try
            {
                uint commandLength = 0;
                AssocQueryString(0, AssocStrCommand, "steam", null, null, ref commandLength);
                if (commandLength == 0)
                {
                    return false;
                }

                var command = new StringBuilder((int)commandLength);
                var result = AssocQueryString(
                    0,
                    AssocStrCommand,
                    "steam",
                    null,
                    command,
                    ref commandLength);
                return result == S_OK && command.Length > 0;
            }
            catch (System.Exception exception)
            {
                Debug.LogWarning(
                    $"[SteamStoreUtility] 无法检测 Steam URL Protocol，将回退到网页商店：{exception.Message}");
                return false;
            }
        }
#endif
    }
}