using System;
using System.IO;
using Tommy;

namespace Plombir;

public class ConfigManager
{
    static private readonly string defaultRuntime = "./runtime";
    static private readonly string defaultVersion = "1.20.1";
    static private readonly string defaultNickname = "slugcat";

    static private readonly string currentTweaksVersion = "1.2.1";

    static private readonly string defaultLoginType = "offline";
    static private readonly string defaultUuid = "offline";
    static private readonly string defaultAccsessToken = "offline";

    public static void BuildDefault()
    {
        TomlTable toml = new TomlTable
        {
            ["title"] = "Launcher tweaks file!",
            ["tweaks-version"] = currentTweaksVersion,

            ["runtime-path"] = new TomlString
            {
                Value = defaultRuntime,
                Comment = "Path to folder that will hold all minecraft versions"
            },

            ["last-version-launched"] = new TomlString
            {
                Value = defaultVersion,
                Comment = "Saving last launched version to use it after launch"
            },

            ["nickname"] = defaultNickname,
            ["login-method"] = defaultLoginType,
            ["uuid"] = defaultUuid,
            ["accsess-token"] = defaultAccsessToken,


        };

        using (StreamWriter writer = File.CreateText("tweaks.toml"))
        {
            toml.WriteTo(writer);
            // Remember to flush the data if needed!
            writer.Flush();
        }
    }

    public static dynamic? ReadConfig(string key)
    {
        if (!File.Exists("tweaks.toml"))
        {
            BuildDefault();
        }
        using (StreamReader reader = File.OpenText("tweaks.toml"))
        {
            TomlTable table = TOML.Parse(reader);

            // If config don't contains it means it's oudated or broken.
            if (!IsValueExists(table, key))
            {
                WriteInConfig(key, "NaN");
            }

            // In case if config is fine return its value
            if (table[key].ToString() != "NaN")
            {
                if ((key == "tweaks-version") & (table[key] != currentTweaksVersion))
                {
                    Console.WriteLine("Warning! Tweaks version mismatch!");
                    WriteInConfig("tweaks-version", "wrong-version");
                }
                return table[key];
            }

            return RepairConfig(key);

        }
    }

    public static bool IsValueExists(TomlTable table, string key)
    {
        if (table.TryGetNode(key, out var _))
            return true;
        return false;
    }

    private static string? RepairConfig(string key)
    {
        Console.WriteLine($"Warning! Can't locate {key} in tweaks! Fallback to defaults!");
        // Handling out-dated or broken toml files by filling with defaults
        switch (key)
        {
            case "runtime-path": { WriteInConfig(key, defaultRuntime); return defaultRuntime; }
            case "last-version-launched": { WriteInConfig(key, defaultVersion); return defaultVersion; }
            case "nickname": { WriteInConfig(key, defaultNickname); return defaultNickname; }

            case "accsess-token": { WriteInConfig(key, defaultAccsessToken); return defaultAccsessToken; }
            case "uuid": { WriteInConfig(key, defaultUuid); return defaultUuid; }
            case "login-method": { WriteInConfig(key, defaultLoginType); return defaultLoginType; }
            case "tweaks-version":
                {
                    WriteInConfig(key, currentTweaksVersion);
                    return "possibly broken";
                }
        }

        return null;
    }

    public static void WriteInConfig(string key, dynamic value)
    {
        if (!File.Exists("tweaks.toml"))
        {
            BuildDefault();
        }

        TomlTable table;

        using (StreamReader reader = File.OpenText("tweaks.toml"))
        {
            table = TOML.Parse(reader);

            table[key] = value;
        }

        using (StreamWriter writer = File.CreateText("tweaks.toml"))
        {
            table.WriteTo(writer);
            // Remember to flush the data if needed!
            writer.Flush();
        }
    }
}