using Catalogger.Backend.Cache;
using Remora.Discord.API.Abstractions.Gateway.Events;
using Remora.Discord.Gateway.Responders;
using Remora.Results;

namespace Catalogger.Backend.Bot.Responders.MemberUpdate;

public class GuildMemberUpdateResponder(ILogger logger, IMemberCache memberCache)
    : IResponder<IGuildMemberUpdate>
{
    private readonly ILogger _logger = logger.ForContext<GuildMemberUpdateResponder>();

    public async Task<Result> RespondAsync(
        IGuildMemberUpdate newMember,
        CancellationToken ct = default
    )
    {
        try
        {
            var oldMember = await memberCache.TryGetAsync(newMember.GuildID, newMember.User.ID);
            if (oldMember == null)
            {
                _logger.Information(
                    "Received member update event for {MemberId} in {GuildId} but they weren't cached, ignoring",
                    newMember.User.ID,
                    newMember.GuildID
                );
                return Result.Success;
            }
        }
        finally
        {
            await memberCache.UpdateAsync(newMember);
        }

        return Result.Success;
    }
}