using SharpChat.Events;
using SharpChat.SockChat.PacketsS2C;
using System;
using System.Linq;

namespace SharpChat.SockChat.Commands {
    public class ChannelCreateCommand : ISockChatClientCommand {
        public bool IsMatch(SockChatClientCommandContext ctx) {
            return ctx.NameEquals("create");
        }

        public void Dispatch(SockChatClientCommandContext ctx) {
            if(!ctx.User.Permissions.HasFlag(UserPermissions.CreateChannel)) {
                ctx.Chat.SendTo(ctx.User, new CommandNotAllowedErrorS2CPacket(ctx.Name));
                return;
            }

            string firstArg = ctx.Args.First();

            bool createChanHasHierarchy;
            if(!ctx.Args.Any() || (createChanHasHierarchy = firstArg.All(char.IsDigit) && ctx.Args.Length < 2)) {
                ctx.Chat.SendTo(ctx.User, new CommandFormatErrorS2CPacket());
                return;
            }

            int createChanHierarchy = 0;
            if(createChanHasHierarchy)
                if(!int.TryParse(firstArg, out createChanHierarchy))
                    createChanHierarchy = 0;

            if(createChanHierarchy > ctx.User.Rank) {
                ctx.Chat.SendTo(ctx.User, new ChannelRankTooHighErrorS2CPacket());
                return;
            }

            string channelName = string.Join('_', ctx.Args.Skip(createChanHasHierarchy ? 1 : 0));

            if(!SockChatUtility.CheckChannelName(channelName)) {
                ctx.Chat.SendTo(ctx.User, new ChannelNameFormatErrorS2CPacket());
                return;
            }

            if(ctx.Chat.Channels.Get(channelName, SockChatUtility.SanitiseChannelName) != null) {
                ctx.Chat.SendTo(ctx.User, new ChannelNameInUseErrorS2CPacket(channelName));
                return;
            }

            ctx.Chat.Events.Dispatch(
                "chan:add",
                channelName,
                ctx.User,
                new ChannelAddEventData(
                    !ctx.User.Permissions.HasFlag(UserPermissions.SetChannelPermanent),
                    createChanHierarchy,
                    string.Empty
                )
            );

            DateTimeOffset now = DateTimeOffset.UtcNow;
            ctx.Chat.Events.Dispatch("chan:leave", now, ctx.Channel, ctx.User);
            ctx.Chat.Events.Dispatch("chan:join", now, channelName, ctx.User);

            ctx.Chat.SendTo(ctx.User, new ChannelCreateResponseS2CPacket(channelName));
        }
    }
}