using Maki.Rest;
using Maki.Structures.Messages;
using Maki.Structures.Rest;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;

namespace Maki
{
    public class DiscordMessage
    {
        public readonly ulong Id;
        public readonly DateTime Sent;
        public readonly DiscordMember Member;
        public readonly DiscordUser User;
        public readonly DiscordChannel Channel;
        private readonly Discord client;

        public string Text { get; internal set; }
        public DateTime Edited { get; internal set; }
        public IEnumerable<DiscordMember> MentionsUsers { get; internal set; }
        public IEnumerable<DiscordRole> MentionsRoles { get; internal set; }
        public bool MentionsEveryone { get; internal set; }
        public bool IsPinned { get; internal set; }

        public bool MentionsMe(bool everyone = false, bool roles = true) =>
            (everyone && MentionsEveryone)
            || (Channel.Type != DiscordChannelType.Private && roles && client.MemberManager.Id(Channel.Server, client.Me)?.Roles.Where(x => MentionsRoles.Contains(x)).Count() > 0)
            || MentionsUsers.Select(x => x.User).Contains(client.Me);

        public bool IsMe => client.Me == User;

        public DiscordServer Server => Channel.Server;

        internal DiscordMessage(Discord discord, Message msg, DiscordChannel channel, DiscordMember member = null)
        {
            client = discord;
            Id = msg.Id;
            Sent = msg.Sent;
            Text = msg.Content;

            if (member != null)
            {
                Member = member;
                User = member.User;
            } else
            {
                member = null;
                User = client.UserManager.Id(msg.User.Id);
                Debug.Assert(User != null, "user is null");
            }

            Channel = channel;
            MentionsUsers = client.MemberManager.Server(channel.Server).Where(x => msg.Mentions.Select(y => y.Id).Contains(x.User.Id));
            MentionsRoles = client.RoleManager  .Server(channel.Server).Where(x => msg.MentionsRoles.Contains(x.Id));
            MentionsEveryone = msg.MentioningEveryone;
            IsPinned = msg.IsPinned == true;
        }

        public DiscordMessage Edit(string text = null, DiscordEmbed embed = null)
        {
            using (WebRequest wr = new WebRequest(HttpMethod.PATCH, RestEndpoints.ChannelMessage(Channel.Id, Id)))
            {
                wr.AddJson(new MessageEdit
                {
                    Text = text,
                    Embed = embed?.ToStruct(),
                });
                wr.Perform();

                if (wr.Status != 200)
                    return this;

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

                Text = msg.Content;
                Edited = msg.Edited ?? DateTime.UtcNow;
            }

            return this;
        }

        public void Delete()
        {
            using (WebRequest wr = new WebRequest(HttpMethod.DELETE, RestEndpoints.ChannelMessage(Channel.Id, Id)))
                wr.Perform();
        }
    }
}