using System.Text.Json;
using System.Text.Json.Serialization;
using Lagrange.Core;
using Lagrange.Core.Common;
using Lagrange.Core.Common.Interface;
using Lagrange.Core.Common.Interface.Api;
using Lagrange.Core.Event.EventArg;
using Shrink.Utility;
using Console = System.Console;

namespace Shrink.Login;

public class QrCode
{
    private static QrCode? _instance;
    
    private static readonly object Lock = new();
    
    public static QrCode Instance
    {
        get
        {
            if (_instance != null) return _instance;
            lock (Lock)
            {
                _instance ??= new QrCode();
            }
            return _instance;
        }
    }

    public BotContext? Client;
    public static void SaveKeystore(BotKeystore keystore) => 
        File.WriteAllText("Keystore.json", JsonSerializer.Serialize(keystore));
    
    public static BotDeviceInfo GetDeviceInfo()
    {
        if (File.Exists("DeviceInfo.json"))
        {
            var info = JsonSerializer.Deserialize<BotDeviceInfo>(File.ReadAllText("DeviceInfo.json"));
            if (info != null) return info;

            info = BotDeviceInfo.GenerateInfo();
            File.WriteAllText("DeviceInfo.json", JsonSerializer.Serialize(info));
            return info;
        }
        
        var deviceInfo = BotDeviceInfo.GenerateInfo();
        File.WriteAllText("DeviceInfo.json", JsonSerializer.Serialize(deviceInfo));
        return deviceInfo;
    }
    public static BotKeystore? LoadKeystore()
    {
        try
        {
            var text = File.ReadAllText("Keystore.json");
            return JsonSerializer.Deserialize<BotKeystore>(text, new JsonSerializerOptions()
            {
                ReferenceHandler = ReferenceHandler.Preserve
            });
        }
        catch
        {
            return null;
        }
    }
    // 登录方法
    public async Task Login()
    {
        #region bot实例化

        var deviceInfo = GetDeviceInfo();
        var keyStore = LoadKeystore() ?? new BotKeystore();

        Client = BotFactory.Create(new BotConfig
        {
            UseIPv6Network = false,
            GetOptimumServer = true,
            AutoReconnect = true,
            Protocol = Protocols.Linux
        }, deviceInfo, keyStore);

        #endregion
        
        // Log模式
        Client.Invoker.OnBotLogEvent += (_, @event) =>
        {
            @event.Level.ChangeColorByTitle();
            Console.WriteLine(@event.ToString());
        };

        // bot信息保存，但存在bug未修复
        Client.Invoker.OnBotOnlineEvent += (_, @event) =>
        {
            Console.WriteLine(@event.ToString());
            SaveKeystore(Client.UpdateKeystore());
        };
        // 二维码生成，启动后在根目录下生成qr.png
        var qrCode = await Client.FetchQrCode();
        if (qrCode != null)
        {
            await File.WriteAllBytesAsync("qr.png", qrCode.Value.QrCode);
            await Client.LoginByQrCode();
        }
    }
}