using SharpChat.PacketsS2C;
using System.Linq;

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

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

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

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

            ctx.Chat.Channels.Add(createChan, sanitiseName: SockChatUtility.SanitiseChannelName);
            foreach(UserInfo ccu in ctx.Chat.Users.GetMany(minRank: ctx.Channel.Rank))
                ctx.Chat.SendTo(ccu, new ChannelCreateS2CPacket(
                    ctx.Channel.Name,
                    ctx.Channel.HasPassword,
                    ctx.Channel.IsTemporary
                ));

            ctx.Chat.SwitchChannel(ctx.User, createChan, createChan.Password);
            ctx.Chat.SendTo(ctx.User, new ChannelCreateResponseS2CPacket(createChan.Name));
        }
    }
}