using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.Json.Serialization.Metadata;
using System.Threading;
using System.Threading.Tasks;
using JacobTechEncryption;
using Luski.net.Enums.Main;
using Luski.net.Interfaces;
using Luski.net.JsonTypes;
using Luski.net.JsonTypes.HTTP;
using Luski.net.Structures.Main;
using Luski.Shared.PublicServers.V1.ClientToServer.HTTP;
using Luski.Shared.PublicServers.V1.Enums;
using Luski.Shared.PublicServers.V1.ServerToClient.HTTP;
using ChannelType = Luski.net.Enums.Main.ChannelType;

namespace Luski.net;

public partial class MainServer : Server
{
    internal MainServer(string Domain, string API_Version):
        base(Domain, API_Version)
    {
    }

    public MainSocketAppUser User { get; internal set; } = default!;

    public List<MainSocketChannel> chans { get; } = new();

    public async Task<MainSocketRemoteUser> SendFriendResult(long user, bool answer, CancellationToken CancellationToken)
    {
        FriendRequestResult json = await SendServer("FriendRequestResult",
            new FriendRequestResultOut()
            {
                Id = user,
                Result = answer
            },
            FriendRequestResultOutContext.Default.FriendRequestResultOut,
            FriendRequestResultContext.Default.FriendRequestResult,
            CancellationToken);

        if (json is not null && json.Error is null && json.ErrorMessage is null && answer && json.Channel is not null)
        {
            MainSocketDMChannel chan = await GetChannel((long)json.Channel, MainSocketDMChannelContext.Default.MainSocketDMChannel, CancellationToken);
            _ = chan.StartKeyProcessAsync(CancellationToken);
            chans.Add(chan);
        }
        else
        {
            throw new Exception(json?.Error.ToString());
        }
        return GetUser(user, MainSocketRemoteUserContext.Default.MainSocketRemoteUser, CancellationToken).Result;
    }
    
    public async Task<MainSocketRemoteUser> SendFriendRequest(long code, CancellationToken CancellationToken)
    {
        string ccode = Convert.ToBase64String(Encryption.Hashing.SHA256(Encoding.Unicode.GetBytes(code.ToString())));
        FriendRequestResult? json = await SendServer("FriendRequest", new FriendRequest() { code = ccode}, FriendRequestContext.Default.FriendRequest, FriendRequestResultContext.Default.FriendRequestResult, CancellationToken);

        if (json.StatusCode != HttpStatusCode.Accepted)
        {
            if (json is not null && json.Error is not null)
            {
                switch ((ErrorCode)(int)json.Error)
                {
                    case ErrorCode.InvalidToken:
                        throw new Exception("Your current token is no longer valid");
                    case ErrorCode.ServerError:
                        throw new Exception($"Error from server: {json.ErrorMessage}");
                    case ErrorCode.InvalidPostData:
                        throw new Exception("The post data dent to the server is not the correct format. This may be because you app is couropt or you are using the wron API version");
                    case ErrorCode.Forbidden:
                        throw new Exception("You already have an outgoing request or the persone is not real");
                }
            }

            if (json is not null && json.Channel is not null)
            {
                MainSocketDMChannel chan = await GetChannel((long)json.Channel, MainSocketDMChannelContext.Default.MainSocketDMChannel, CancellationToken);
                _ = chan.StartKeyProcessAsync(CancellationToken);
                chans.Add(chan);
            }
        }

        MainSocketRemoteUser b = await GetUser(code, MainSocketRemoteUserContext.Default.MainSocketRemoteUser, CancellationToken);
        if (json.Channel is not null)
            b.FriendStatus = FriendStatus.Friends;
        else
            b.FriendStatus = FriendStatus.PendingOut;
        return b;
    }
    
    public async Task<TChannel> GetChannel<TChannel>(long Channel, CancellationToken CancellationToken) where TChannel : MainSocketChannel, new()
    {
        TChannel Return = new();
        switch (Return)
        {
            case MainSocketDMChannel:
                Return = (await GetChannel(Channel, MainSocketDMChannelContext.Default.MainSocketDMChannel, CancellationToken) as TChannel)!;
                break;
            case MainSocketGroupChannel:
                Return = (await GetChannel(Channel, MainSocketGroupChannelContext.Default.MainSocketGroupChannel, CancellationToken) as TChannel)!;
                break;
            case MainSocketTextChannel:
                Return = (await GetChannel(Channel, MainSocketTextChannelContext.Default.MainSocketTextChannel, CancellationToken) as TChannel)!;
                break;
            case MainSocketChannel:
                Return = (await GetChannel(Channel, MainSocketChannelContext.Default.MainSocketChannel, CancellationToken) as TChannel)!;
                break;
            case null:
                throw new NullReferenceException(nameof(TChannel));
            default:
                throw new Exception("Unknown channel type");
        }
        return Return;
    }
    
    internal async Task<TChannel> GetChannel<TChannel>(long id, JsonTypeInfo<TChannel> Json, CancellationToken CancellationToken) where TChannel : MainSocketChannel, new()
    {
        TChannel request;
        if (chans.Count > 0 && chans.Any(s => s.Id == id))
        {
            return (chans.Where(s => s is TChannel && s.Id == id).First() as TChannel)!;
        }
        while (true)
        {
            if (CanRequest)
            {
                request = await GetFromServer($"SocketChannel/Get/{id}", Json, CancellationToken);
                break;
            }
        }
        if (request is null) throw new Exception("Something was wrong with the server responce");
        if (request.Error is null)
        {
            if (chans.Count > 0 && chans.Any(s => s.Id == request.Id))
            {
                foreach (MainSocketChannel? p in chans.Where(s => s.Id == request.Id))
                {
                    chans.Remove(p);
                }
            }
            request.Server = this;
            chans.Add(request);
            return request;
        }
        throw request.Error switch
        {
            ErrorCode.InvalidToken => new Exception("Your current token is no longer valid"),
            ErrorCode.Forbidden => new Exception("The server rejected your request"),
            ErrorCode.ServerError => new Exception("Error from server: " + request.ErrorMessage),
            ErrorCode.InvalidURL or ErrorCode.MissingHeader => new Exception(request.ErrorMessage),
            _ => new Exception($"Unknown data: '{request.ErrorMessage}'"),
        };
    }
    
    public Task<Tuser> GetUser<Tuser>(long UserID, CancellationToken CancellationToken) where Tuser : MainSocketUserBase, new()
    {
        Tuser user = new();
        switch (user)
        {
            case MainSocketAppUser:
                user = (GetUser(UserID, MainSocketAppUserContext.Default.MainSocketAppUser, CancellationToken).Result as Tuser)!;
                break;
            case MainSocketRemoteUser:
                user = (GetUser(UserID, MainSocketRemoteUserContext.Default.MainSocketRemoteUser, CancellationToken).Result as Tuser)!;
                break;
            case MainSocketUserBase:
                user = (GetUser(UserID, MainSocketUserBaseContext.Default.MainSocketUserBase, CancellationToken).Result as Tuser)!;
                break;
            case null:
                throw new NullReferenceException(nameof(Tuser));
            default:
                throw new Exception("Unknown channel type");
        }

        return Task.FromResult(user);
    }
    
    public async Task<MainSocketMessage> GetMessage(long id, CancellationToken CancellationToken)
    {
        MainSocketMessage message;
        while (true)
        {
            if (CanRequest)
            {
                message = await GetFromServer("socketmessage",
                    MainSocketMessageContext.Default.MainSocketMessage,
                    CancellationToken,
                    new KeyValuePair<string, string?>("msg_id", id.ToString()));
                break;
            }
        }

        if (message is not null)
        {
            message.Server = this;
            return message;
        }
        throw new Exception("Server did not return a message");
    }
    
    /// <summary>
    /// Sends the server a request to update the <paramref name="Status"/> of you account
    /// </summary>
    /// <param name="Status">The <see cref="UserStatus"/> you want to set your status to</param>
    /// <exception cref="Exception"></exception>
    public async Task<Task> UpdateStatus(UserStatus Status, CancellationToken CancellationToken)
    {
        STC? data = await SendServer("SocketUserProfile/Status", new StatusUpdateCTS() { Status = Status }, StatusUpdateCTSContext.Default.StatusUpdateCTS, STCContext.Default.STC, CancellationToken);
        if (data.Error is not null && ((int)data.StatusCode < 200 || (int)data.StatusCode > 299))
        {
            if (data?.ErrorMessage is not null) throw new Exception(data.ErrorMessage);
            if (data?.Error is not null) throw new Exception(((int)data.Error).ToString());
            else throw new Exception("Something went worng");
        }

        User.Status = Status;
        return Task.CompletedTask;
    }
    
    internal async Task<Tuser> GetUser<Tuser>(long UserId, JsonTypeInfo<Tuser> Json, CancellationToken CancellationToken) where Tuser : MainSocketUserBase, new()
    {
        Tuser user;
        if (poeople.Count > 0 && poeople.Any(s => s.Id == UserId))
        {
            Tuser temp = poeople.Where(s => s is Tuser && s.Id == UserId).Cast<Tuser>().FirstOrDefault()!;
            if (temp is MainSocketRemoteUser && (temp as MainSocketRemoteUser)!.Channel == null)
            {
                foreach (MainSocketDMChannel chan in chans.Where(s => s is MainSocketDMChannel).Cast<MainSocketDMChannel>())
                {
                    if (chan.Type == ChannelType.DM && chan.Id != 0 && chan.MemberIdList is not null)
                    {
                        if (chan.MemberIdList.Any(s => s == UserId)) (temp as MainSocketRemoteUser)!.Channel = chan;
                    }
                }
            }
            return temp;
        }
        while (true)
        {
            if (CanRequest)
            {
                user = await GetFromServer("socketuser",
                    Json,
                    CancellationToken,
                    new KeyValuePair<string, string?>("id", UserId.ToString()));
                break;
            }
        }

        if (user is null) throw new Exception("Server did not return a user");
        if (poeople.Count > 0 && poeople.Any(s => s.Id == UserId))
        {
            foreach (IUser? p in poeople.Where(s => s.Id == UserId))
            {
                poeople.Remove(p);
            }
        }

        user.Server = this;
        if (user is MainSocketRemoteUser && (user as MainSocketRemoteUser)!.Channel == null)
        {
            foreach (MainSocketDMChannel chan in chans.Where(s => s is MainSocketDMChannel).Cast<MainSocketDMChannel>())
            {
                if (chan.Type == ChannelType.DM && chan.Id != 0 && chan.MemberIdList is not null)
                {
                    if (chan.MemberIdList.Any(s => s == UserId)) (user as MainSocketRemoteUser)!.Channel = chan;
                }
            }
        }
        poeople.Add(user);
        return user;
    }
}