using System;
using UnityEngine;

namespace AOT.Patch
{
    [Serializable]
    public class VersionInfo
    {
        public string appVersionMin = "1.0.0";
        public string appVersionMax = "1.0.0";
        public string resVersion = "0";
        public string cdnRoot = "https://www.xworld.ren/wechat/1.0.0";
        public string[] packages = { "DefaultPackage" };
        public bool forceUpdate;
        public string notice = "";
        /// <summary>兼容旧版本字段；当前 UI 仅支持 candy，其他主题值回退到 Candy。</summary>
        public string uiTheme;

        public static VersionInfo FromJson(string json)
        {
            if (string.IsNullOrEmpty(json))
                return null;
            try
            {
                return JsonUtility.FromJson<VersionInfo>(json);
            }
            catch (Exception e)
            {
                Debug.LogError($"[VersionInfo] parse failed: {e.Message}");
                return null;
            }
        }

        public static int CompareVersion(string a, string b)
        {
            if (string.IsNullOrEmpty(a) && string.IsNullOrEmpty(b)) return 0;
            if (string.IsNullOrEmpty(a)) return -1;
            if (string.IsNullOrEmpty(b)) return 1;

            var pa = a.Split('.');
            var pb = b.Split('.');
            int n = Mathf.Max(pa.Length, pb.Length);
            for (int i = 0; i < n; i++)
            {
                int va = i < pa.Length && int.TryParse(pa[i], out var xa) ? xa : 0;
                int vb = i < pb.Length && int.TryParse(pb[i], out var xb) ? xb : 0;
                if (va != vb) return va.CompareTo(vb);
            }
            return 0;
        }
    }
}