using SharpChat.Packet;
using System.Linq;

namespace SharpChat.Commands {
    public class CreateChannelCommand : IChatCommand {
        public bool IsMatch(ChatCommandContext ctx) {
            return ctx.NameEquals("create");
        }

        public void Dispatch(ChatCommandContext ctx) {
            if(ctx.User.Can(ChatUserPermissions.CreateChannel)) {
                ctx.User.Send(new LegacyCommandResponse(LCR.COMMAND_NOT_ALLOWED, true, $"/{ctx.Name}"));
                return;
            }

            string firstArg = ctx.Args.First();

            bool createChanHasHierarchy;
            if(!ctx.Args.Any() || (createChanHasHierarchy = firstArg.All(char.IsDigit) && ctx.Args.Length < 2)) {
                ctx.User.Send(new LegacyCommandResponse(LCR.COMMAND_FORMAT_ERROR));
                return;
            }

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

            if(createChanHierarchy > ctx.User.Rank) {
                ctx.User.Send(new LegacyCommandResponse(LCR.INSUFFICIENT_HIERARCHY));
                return;
            }

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

            if(!ChatChannel.CheckName(createChanName)) {
                ctx.User.Send(new LegacyCommandResponse(LCR.CHANNEL_NAME_INVALID));
                return;
            }

            lock(ctx.Chat.ChannelsAccess) {
                if(ctx.Chat.Channels.Any(c => c.NameEquals(createChanName))) {
                    ctx.User.Send(new LegacyCommandResponse(LCR.CHANNEL_ALREADY_EXISTS, true, createChanName));
                    return;
                }

                ChatChannel createChan = new() {
                    Name = createChanName,
                    IsTemporary = !ctx.User.Can(ChatUserPermissions.SetChannelPermanent),
                    Rank = createChanHierarchy,
                    Owner = ctx.User,
                };

                ctx.Chat.Channels.Add(createChan);
                lock(ctx.Chat.UsersAccess) {
                    foreach(ChatUser ccu in ctx.Chat.Users.Where(u => u.Rank >= ctx.Channel.Rank))
                        ccu.Send(new ChannelCreatePacket(ctx.Channel));
                }

                ctx.Chat.SwitchChannel(ctx.User, createChan, createChan.Password);
                ctx.User.Send(new LegacyCommandResponse(LCR.CHANNEL_CREATED, false, createChan.Name));
            }
        }
    }
}