using SharpChat.EventStorage;
using SharpChat.SockChat.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 async Task Dispatch(ClientCommandContext ctx) {
        long msgId = ctx.Chat.RandomSnowflake.Next();
        bool deleteAnyMessage = ctx.User.Can(UserPermissions.DeleteAnyMessage);

        if(!deleteAnyMessage && !ctx.User.Can(UserPermissions.DeleteOwnMessage)) {
            await 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)) {
            await 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)) {
            await ctx.Chat.SendTo(ctx.User, new CommandResponseS2CPacket(msgId, LCR.MESSAGE_DELETE_ERROR));
            return;
        }

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