using Microsoft.VisualBasic.CompilerServices;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;

namespace ModpackUpdater;

public class ModpackInfo
{
    private const string FILENAME_MODPACKINFO = "modpack-info.json";

    [JsonConverter(typeof(VersionConverter))]
    public Version? Version { get; set; }
    public string? ConfigUrl { get; set; }
    public string? ExtrasKey { get; set; }
    public InstallOptionValueDictionary Options { get; } = [];

    [JsonIgnore]
    public string? LocalPath { get; private set; }
    [JsonIgnore]
    public bool Exists => LocalPath != null && File.Exists(GetFilePath(LocalPath));

    public void Save()
    {
        if (LocalPath != null)
            File.WriteAllText(GetFilePath(LocalPath), JsonConvert.SerializeObject(this));
    }

    public void Save(string mcRoot)
    {
        LocalPath = mcRoot;
        Save();
    }

    public static ModpackInfo TryLoad(string? mcRoot)
    {
        if (mcRoot != null && HasModpackInfo(mcRoot))
            return Load(mcRoot);
        return new()
        {
            LocalPath = mcRoot
        };
    }

    public static ModpackInfo Load(string mcRoot)
    {
        var info = JsonConvert.DeserializeObject<ModpackInfo>(File.ReadAllText(GetFilePath(mcRoot))) ?? new();
        info.LocalPath = mcRoot;
        return info;
    }

    public static bool HasModpackInfo(string mcRoot)
    {
        return File.Exists(Conversions.ToString(GetFilePath(mcRoot)));
    }

    private static string GetFilePath(string mcRoot)
    {
        return Path.Combine(mcRoot, FILENAME_MODPACKINFO);
    }
}