using Microsoft.Extensions.Caching.Memory;
using Remora.Discord.API.Abstractions.Gateway.Events;
using Remora.Discord.Gateway.Responders;

namespace Scathach.Discord.Responders;

[PublicAPI]
public class GuildCreateResponder(
    IConfigurationRoot configuration,
    IDbContextFactory<ScathachDbContext> database,
    ILogger<GuildCreateResponder> logger,
    IMemoryCache memoryCache
) : IResponder<IGuildCreate>
{
    public async Task<Result> RespondAsync(IGuildCreate gatewayEvent, CancellationToken ct = default)
    {
        logger.LogInformation("{Availability} Guild {Name} has just been created.",
            $"{(gatewayEvent.Guild.IsT0 ? "A" : "Una")}vailable", 
            gatewayEvent.Guild.IsT0 ? gatewayEvent.Guild.AsT0.Name : gatewayEvent.Guild.AsT1.ID.ToString());
        
        if (gatewayEvent.Guild.IsT1) return Result.FromSuccess();

        var guild = gatewayEvent.Guild.AsT0;
        var guildModel = new GuildModel(guild.ID.ToString())
        {
            Name = guild.Name,
            Prefix = configuration["PREFIX"]!
        };
        
        await using (var databaseContext = await database.CreateDbContextAsync(ct))
        {
            var dbGuild = await databaseContext.Guilds.SingleOrDefaultAsync(g => g.Id == guild.ID.ToString(), ct);
            
            if (dbGuild is null) // Only add actual new guilds to the database as this fires on ALL guilds during startup
            {
                databaseContext.Guilds.Add(guildModel);
                await databaseContext.SaveChangesAsync(ct);
            }
            else 
                guildModel = dbGuild;
        }

        using (var entry = memoryCache.CreateEntry(CacheKey.StringKey($"Guild:{guild.ID}")))
            entry.Value = guildModel;
        
        return Result.FromSuccess();
    }
}