using SharpChat.SockChat.S2CPackets;

namespace SharpChat.ClientCommands {
    public class CreateChannelClientCommand : ClientCommand {
        public bool IsMatch(ClientCommandContext ctx) {
            return ctx.NameEquals("create");
        }

        public async Task Dispatch(ClientCommandContext ctx) {
            long msgId = ctx.Chat.RandomSnowflake.Next();

            if(!ctx.User.Can(UserPermissions.CreateChannel)) {
                await ctx.Chat.SendTo(ctx.User, new CommandResponseS2CPacket(msgId, LCR.COMMAND_NOT_ALLOWED, true, $"/{ctx.Name}"));
                return;
            }

            string firstArg = ctx.Args.First();

            bool createChanHasHierarchy;
            if(ctx.Args.Length < 1 || (createChanHasHierarchy = firstArg.All(char.IsDigit) && ctx.Args.Length < 2)) {
                await ctx.Chat.SendTo(ctx.User, new CommandResponseS2CPacket(msgId, LCR.COMMAND_FORMAT_ERROR));
                return;
            }

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

            if(createChanHierarchy > ctx.User.Rank) {
                await ctx.Chat.SendTo(ctx.User, new CommandResponseS2CPacket(msgId, LCR.INSUFFICIENT_HIERARCHY));
                return;
            }

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

            if(!Channel.CheckName(createChanName)) {
                await ctx.Chat.SendTo(ctx.User, new CommandResponseS2CPacket(msgId, LCR.CHANNEL_NAME_INVALID));
                return;
            }

            if(ctx.Chat.Channels.Any(c => c.NameEquals(createChanName))) {
                await ctx.Chat.SendTo(ctx.User, new CommandResponseS2CPacket(msgId, LCR.CHANNEL_ALREADY_EXISTS, true, createChanName));
                return;
            }

            Channel createChan = new(
                createChanName,
                isTemporary: !ctx.User.Can(UserPermissions.SetChannelPermanent),
                rank: createChanHierarchy,
                ownerId: ctx.User.UserId
            );

            ctx.Chat.Channels.Add(createChan);
            foreach(User ccu in ctx.Chat.Users.Where(u => u.Rank >= ctx.Channel.Rank))
                await ctx.Chat.SendTo(ccu, new ChannelCreateS2CPacket(createChan.Name, createChan.HasPassword, createChan.IsTemporary));

            await ctx.Chat.SwitchChannel(ctx.User, createChan, createChan.Password);
            await ctx.Chat.SendTo(ctx.User, new CommandResponseS2CPacket(msgId, LCR.CHANNEL_CREATED, false, createChan.Name));
        }
    }
}