using Newtonsoft.Json.Linq;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Dynamic;
using System.Linq;
using System.Net.WebSockets;
using System.Text;
using System.Threading.Tasks;

namespace PluralRichPresence.SimplyPlural
{
    public class Socket : ApiType
    {
        public event EventHandler FronterChanged;
        ClientWebSocket wss = new ClientWebSocket();
        Timer? keepAliveTimer = null;

        private void onFronterChanged(dynamic fronterChangedEventData)
        {
            if(FronterChanged is not null)
            {
                FronterChanged(this, new EventArgs());
            }
        }
        private async Task<string> receiveMessageText()
        {
            byte[] byteArray = await receiveMessageBytes();
            return Encoding.UTF8.GetString(byteArray);
        }
        private async Task<byte[]> receiveMessageBytes()
        {
            List<byte> totalPayload = new List<byte>();
            byte[] buffer = new byte[0x8000];

            while (wss.State == WebSocketState.Open)
            {
                WebSocketReceiveResult result = await wss.ReceiveAsync(buffer, CancellationToken.None);

                for (int i = 0; i < result.Count; i++)
                    totalPayload.Add(buffer[i]);

                if (result.EndOfMessage)
                    return totalPayload.ToArray();
            }

            return totalPayload.ToArray();
        }

        private async Task doUpdate(dynamic jsonData)
        {
            string target = jsonData.target;
            switch (target)
            {
                case "frontHistory":
                    onFronterChanged(jsonData);
                    break;
            }
        }

        private async Task receiveTask()
        {
            while (wss.State == WebSocketState.Open)
            {
                string message = await receiveMessageText();
                if (message == "pong") continue;
                Console.WriteLine("< " + message);

                try
                {
                    dynamic? jsonData = JsonConvert.DeserializeObject(message);
                    if (jsonData is null) continue;
                    string type = jsonData.msg;
                    if(type == "update")
                    {
                        await doUpdate(jsonData);
                    }
                }
                catch (Exception) { };
            }
        }

        private async Task connect()
        {
            await wss.ConnectAsync(new Uri("wss://api.apparyllis.com/v1/socket"), CancellationToken.None);
            _ = receiveTask();
            keepAliveTimer = new Timer((TimerCallback) => { _ = sendKeepAlive(); }, null, 0, 10 * 1000);
        }

        private async Task sendText(string text)
        {
            if (wss.State != WebSocketState.Open)
                await connect();

            Console.WriteLine("> " + text);
            await wss.SendAsync(Encoding.UTF8.GetBytes(text), WebSocketMessageType.Text, true, CancellationToken.None);
        }
        private async Task sendKeepAlive()
        {
            await sendText("ping");
        }
        private async Task sendLogin()
        {
            dynamic data = new ExpandoObject();
            data.op = "authenticate";
            data.token = token;
            string authenticateJson = JsonConvert.SerializeObject(data);
            await sendText(authenticateJson);
        }

        public Socket(string token) : base(token)
        {
            _ = sendLogin();
        }

    }
}