using System.Collections.Concurrent;
using Remora.Discord.API.Abstractions.Objects;
using Remora.Rest.Core;

namespace Catalogger.Backend.Cache.InMemoryCache;

public class InMemoryMemberCache : IMemberCache
{
    private readonly ConcurrentDictionary<(Snowflake, Snowflake), IGuildMember> _members = new();
    private readonly ConcurrentDictionary<Snowflake, byte> _guilds = new();

#pragma warning disable CS8619 // Nullability of reference types in value doesn't match target type.
    public Task<IGuildMember?> TryGetAsync(Snowflake guildId, Snowflake userId) =>
        _members.TryGetValue((guildId, userId), out var member)
            ? Task.FromResult(member)
            : Task.FromResult<IGuildMember?>(null);
#pragma warning restore CS8619 // Nullability of reference types in value doesn't match target type.

    public Task SetAsync(Snowflake guildId, IGuildMember member)
    {
        if (!member.User.IsDefined())
            throw new CataloggerError("Member with undefined User passed to InMemoryMemberCache.SetAsync");
        _members[(guildId, member.User.Value.ID)] = member;
        return Task.CompletedTask;
    }

    public async Task SetManyAsync(Snowflake guildId, IReadOnlyList<IGuildMember> members)
    {
        foreach (var member in members)
            await SetAsync(guildId, member);
    }

    public Task RemoveAsync(Snowflake guildId, Snowflake userId)
    {
        _members.Remove((guildId, userId), out _);
        return Task.CompletedTask;
    }

    public Task<bool> IsGuildCachedAsync(Snowflake guildId) => Task.FromResult(_guilds.ContainsKey(guildId));

    public Task MarkAsCachedAsync(Snowflake guildId)
    {
        _guilds[guildId] = 1;
        return Task.CompletedTask;
    }

    public Task MarkAsUncachedAsync(Snowflake guildId)
    {
        _guilds.Remove(guildId, out _);
        return Task.CompletedTask;
    }
}