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

namespace SpotifyAPIv1
{
    class RemoteHandler
    {
        private static RemoteHandler instance = new RemoteHandler();

        public String oauthKey {get;private set;}
        public String cfidKey {get;private set;}

        public String host = "127.0.0.1";

        WebClient wc;
        MusicHandler mh;
        internal static RemoteHandler GetInstance()
        {
            return instance;
        }

        internal RemoteHandler()
        {
            
            wc = new WebClient();
            wc.Proxy = null;
            wc.Headers.Add("Origin", "https://embed.spotify.com");
            wc.Headers.Add("Referer", "https://embed.spotify.com/?uri=spotify:track:5Zp4SWOpbuOdnsxLqwgutt");
        }
        internal void Init()
        {
            oauthKey = GetOAuthKey();
            cfidKey = GetCFID();
        }
        internal void SendPauseRequest()
        {
            recv("remote/pause.json?pause=true", true, true, -1);
        }
        internal void SetVolumeRequest()
        {
            Console.WriteLine(recv("remote/info.json", true, true, -1));
        }
        internal void SendPlayRequest()
        {
            recv("remote/pause.json?pause=false", true, true, -1);
        }
        internal StatusResponse Update()
        {
            String response = recv("remote/status.json", true, true, -1);
            if(response == "")
            {
                return Update();
            }
            response = response.Replace("\\n", "");
            List<StatusResponse> raw = (List<StatusResponse>)JsonConvert.DeserializeObject(response,typeof(List<StatusResponse>));
            return raw[0];
        }
        private String GetOAuthKey()
        {
            String raw = "";
            using(WebClient wc = new WebClient())
            {
                wc.Proxy = null;
                raw = wc.DownloadString("http://open.spotify.com/token");
            }
            Dictionary<String, object> lol = (Dictionary<String, object>)JsonConvert.DeserializeObject<Dictionary<String, object>>(raw);
            return (String)lol["t"];
        }

        private String GetCFID()
        {
            string a = recv("simplecsrf/token.json", false, false, -1);
            List<CFID> d = (List<CFID>)JsonConvert.DeserializeObject(a, typeof(List<CFID>));
            if (d.Count != 1)
                throw new Exception("CFID konnte nicht geladen werden.");
            return d[0].token;
        }
        private string recv(string request, bool oauth, bool cfid, int wait)
        {
            string parameters = "?&ref=&cors=&_=" + TimeStamp;
            if (request.Contains("?"))
            {
                parameters = parameters.Substring(1);
            }

            if (oauth)
            {
                parameters += "&oauth=" + oauthKey;
            }
            if (cfid)
            {
                parameters += "&csrf=" + cfidKey;
            }

            if (wait != -1)
            {
                parameters += "&returnafter=" + wait;
                parameters += "&returnon=login%2Clogout%2Cplay%2Cpause%2Cerror%2Cap";
            }

            string a = "http://" + host + ":4380/" + request + parameters;
            string derp = "";
            try
            {
                derp = wc.DownloadString(a);
                derp = "[ " + derp + " ]";
            }
            catch (Exception z)
            {

            }
            return derp;
        }
        private int TimeStamp
        {
            get
            {
                return Convert.ToInt32((DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds);
            }
        }
    }
}