using UnityEngine;
using System;
using System.Linq;
using System.IO;

public class VersionTool : IComparable<VersionTool>
{
    public const string Build_Ver_File_Name = "buildver.txt";
    public static string PackVer
    {
        get
        {
            string[] splitVersion = Application.version.Split('.');
            return $"{splitVersion[0]}_{splitVersion[1]}";
        }
    }

    public int Major { get; private set; }
    public int Minor { get; private set; }
    public string Build { get; private set; }

    private VersionTool(int major, int minor, string build)
    {
        Major = major;
        Minor = minor;
        Build = build;
    }

    public static VersionTool FromString(string version)
    {
        string[] splitVersion = version.Split('.');
        return new VersionTool(int.Parse(splitVersion[0]), int.Parse(splitVersion[1]), splitVersion[2]);
    }

    public static VersionTool FromLocal()
    {
        string appVerStr = Application.version;
        string [] splitVersion = appVerStr.Split('.');
        return new VersionTool(int.Parse(splitVersion[0]), int.Parse(splitVersion[1]), GetLoacalBuild());
    }

    private static string GetLoacalBuild()
    {
        var persisterBVerFile = $"{Application.persistentDataPath}/{Build_Ver_File_Name}";
        if(File.Exists(persisterBVerFile))
        {
            return File.ReadAllText(persisterBVerFile);
        }
        if (BetterStreamingAssets.FileExists(Build_Ver_File_Name))
            return BetterStreamingAssets.ReadAllText(Build_Ver_File_Name);
        return "None";
    }

    public int CompareTo(VersionTool other)
    {
        int result = Major.CompareTo(other.Major);
        if (result == 0)
        {
            result = Minor.CompareTo(other.Minor);
        }
        return result;
    }

    public static bool operator >(VersionTool a, VersionTool b)
    {
        return a.CompareTo(b) > 0;
    }

    public static bool operator <(VersionTool a, VersionTool b)
    {
        return a.CompareTo(b) < 0;
    }
    public static bool operator ==(VersionTool a, VersionTool b)
    {
        return a.CompareTo(b) == 0;
    }

    public static bool operator !=(VersionTool a, VersionTool b)
    {
        return a.CompareTo(b) !=0 ;
    }

    public override string ToString()
    {
        return $"Ver {Major}_{Minor}_{Build}";
    }

    public string ToVerString()
    {
        Debug.Log($"{Major}.{Minor}.{Build}");
        return $"{Major}.{Minor}.{Build}";
    }

    public void Save()
    {
        var persisterBVerFile = $"{Application.persistentDataPath}/{Build_Ver_File_Name}";
        File.Delete(persisterBVerFile);
        File.WriteAllText(persisterBVerFile, Build);
    }
}