using Maki.Rest;
using Maki.Structures.Channels;
using Maki.Structures.Messages;
using Maki.Structures.Rest;
using Newtonsoft.Json;
using System.Diagnostics;
using System.IO;

namespace Maki
{
    public class DiscordChannel
    {
        public readonly ulong Id;
        public readonly DiscordServer Server;
        private readonly Discord client;

        public string Name { get; internal set; }
        public DiscordChannelType Type { get; internal set; }

        public int Position { get; internal set; }

        public string Topic { get; internal set; }
        public ulong LastMessageId { get; internal set; }

        public int Bitrate { get; internal set; }
        public int UserLimit { get; internal set; }

        public override string ToString() => $@"<#{Id}>";

        internal DiscordChannel(Discord discord, Channel channel, DiscordServer server = null)
        {
            client = discord;
            Id = channel.Id;
            Name = channel.Name;
            Type = (DiscordChannelType)channel.Type;
            Position = channel.Position ?? 0;
            Topic = channel.Topic;
            LastMessageId = channel.LastMessageId ?? 0;
            Bitrate = channel.Bitrate ?? 0;
            UserLimit = channel.UserLimit ?? 0;
            Server = server;
        }

        public DiscordMessage Send(string text = "", DiscordEmbed embed = null, string filename = null, byte[] file = null)
        {
            Message? msg = null;

            using (WebRequest wr = new WebRequest(HttpMethod.POST, RestEndpoints.ChannelMessages(Id)))
            {
                wr.AddParam("payload_json", JsonConvert.SerializeObject(new MessageCreate
                {
                    Text = text,
                    Embed = embed?.ToStruct(),
                }));

                if (file != null && !string.IsNullOrEmpty(filename))
                    wr.AddFile(filename, file);

                wr.Perform();

                if (wr.Status != 200 || wr.ResponseString.Length < 1)
                    // TODO: elaborate
                    //throw new DiscordException("Failed to send message");
                    return null;

                msg = wr.ResponseJson<Message>();
            }

            if (!msg.HasValue)
                throw new DiscordException("Empty response?");

            DiscordMember member = client.MemberManager.Id(Server, msg.Value.User.Id);
            Debug.Assert(member != null, "member is null");

            DiscordMessage message = new DiscordMessage(client, msg.Value, this, member);
            client.MessageManager.Add(message);
            return message;
        }

        public DiscordMessage Send(Stream stream, string filename, string text = "", DiscordEmbed embed = null)
        {
            byte[] bytes = new byte[stream.Length];
            stream.Read(bytes, 0, bytes.Length);
            return Send(text, embed, filename, bytes);
        }
    }
}