using SharpChat.EventStorage;
using SharpChat.S2CPackets;

namespace SharpChat.ClientCommands
{
    public class DeleteMessageClientCommand : ClientCommand {
        public bool IsMatch(ClientCommandContext ctx) {
            return ctx.NameEquals("delmsg") || (
                ctx.NameEquals("delete")
                && ctx.Args.FirstOrDefault()?.All(char.IsDigit) == true
            );
        }

        public void Dispatch(ClientCommandContext ctx) {
            long msgId = ctx.Chat.RandomSnowflake.Next();
            bool deleteAnyMessage = ctx.User.Can(UserPermissions.DeleteAnyMessage);

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

            string? firstArg = ctx.Args.FirstOrDefault();

            if(string.IsNullOrWhiteSpace(firstArg) || !firstArg.All(char.IsDigit) || !long.TryParse(firstArg, out long delSeqId)) {
                ctx.Chat.SendTo(ctx.User, new CommandResponseS2CPacket(msgId, LCR.COMMAND_FORMAT_ERROR));
                return;
            }

            StoredEventInfo? delMsg = ctx.Chat.Events.GetEvent(delSeqId);

            if(delMsg?.Sender is null || delMsg.Sender.Rank > ctx.User.Rank || (!deleteAnyMessage && delMsg.Sender.UserId != ctx.User.UserId)) {
                ctx.Chat.SendTo(ctx.User, new CommandResponseS2CPacket(msgId, LCR.MESSAGE_DELETE_ERROR));
                return;
            }

            ctx.Chat.Events.RemoveEvent(delMsg);
            ctx.Chat.Send(new ChatMessageDeleteS2CPacket(delMsg.Id));
        }
    }
}