using SharpChat.Channels;
using SharpChat.SockChat.S2CPackets;
using SharpChat.Users;

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.Permissions.HasFlag(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));

        try {
            Channel channel = ctx.Chat.Channels.CreateChannel(
                createChanName,
                temporary: !ctx.User.Permissions.HasFlag(UserPermissions.SetChannelPermanent),
                rank: createChanHierarchy,
                ownerId: ctx.User.UserId
            );

            foreach(User ccu in ctx.Chat.Users.GetUsersOfMinimumRank(ctx.Channel.Rank))
                await ctx.Chat.SendTo(ccu, new ChannelCreateS2CPacket(channel.Name, channel.HasPassword, channel.IsTemporary));

            await ctx.Chat.SwitchChannel(ctx.User, channel, channel.Password);
            await ctx.Chat.SendTo(ctx.User, new CommandResponseS2CPacket(msgId, LCR.CHANNEL_CREATED, false, channel.Name));
        } catch(ChannelNameFormatException) {
            await ctx.Chat.SendTo(ctx.User, new CommandResponseS2CPacket(msgId, LCR.CHANNEL_NAME_INVALID));
        } catch(ChannelExistsException) {
            await ctx.Chat.SendTo(ctx.User, new CommandResponseS2CPacket(msgId, LCR.CHANNEL_ALREADY_EXISTS, true, createChanName));
        }
    }
}