using System.Threading.Tasks;

using Dapper;

using Myriad.Cache;
using Myriad.Rest;
using Myriad.Types;

using PluralKit.Core;

using Serilog;

namespace PluralKit.Bot {
    public class LogChannelService {
        private readonly EmbedService _embed;
        private readonly IDatabase _db;
        private readonly ModelRepository _repo;
        private readonly ILogger _logger;
        private readonly IDiscordCache _cache;
        private readonly DiscordApiClient _rest;

        public LogChannelService(EmbedService embed, ILogger logger, IDatabase db, ModelRepository repo, IDiscordCache cache, DiscordApiClient rest)
        {
            _embed = embed;
            _db = db;
            _repo = repo;
            _cache = cache;
            _rest = rest;
            _logger = logger.ForContext<LogChannelService>();
        }

        public async ValueTask LogMessage(MessageContext ctx, ProxyMatch proxy, Message trigger, ulong hookMessage)
        {
            if (ctx.SystemId == null || ctx.LogChannel == null || ctx.InLogBlacklist) return;
            
            // Find log channel and check if valid
            var logChannel = await FindLogChannel(trigger.GuildId!.Value, ctx.LogChannel.Value);
            if (logChannel == null || logChannel.Type != Channel.ChannelType.GuildText) return;
            
            // Check bot permissions
            // if (!logChannel.BotHasAllPermissions(Permissions.SendMessages | Permissions.EmbedLinks))
            // {
            //     _logger.Information(
            //         "Does not have permission to proxy log, ignoring (channel: {ChannelId}, guild: {GuildId}, bot permissions: {BotPermissions})", 
            //         ctx.LogChannel.Value, trigger.GuildId!.Value, trigger.Channel.BotPermissions());
            //     return;
            // }
            //
            // Send embed!
            
            // TODO: fix?
            // await using var conn = await _db.Obtain();
            // var embed = _embed.CreateLoggedMessageEmbed(await _repo.GetSystem(conn, ctx.SystemId.Value),
            //     await _repo.GetMember(conn, proxy.Member.Id), hookMessage, trigger.Id, trigger.Author, proxy.Content,
            //     trigger.Channel);
            // var url = $"https://discord.com/channels/{trigger.Channel.GuildId}/{trigger.ChannelId}/{hookMessage}";
            // await logChannel.SendMessageFixedAsync(content: url, embed: embed);
        }

        private async Task<Channel?> FindLogChannel(ulong guildId, ulong channelId)
        {
            // TODO: fetch it directly on cache miss?
            var channel = await _cache.GetChannel(channelId);
            
            if (channel == null)
            {
                // Channel doesn't exist or we don't have permission to access it, let's remove it from the database too
                _logger.Warning("Attempted to fetch missing log channel {LogChannel} for guild {Guild}, removing from database", channelId, guildId);
                await using var conn = await _db.Obtain();
                await conn.ExecuteAsync("update servers set log_channel = null where id = @Guild",
                    new {Guild = guildId});
            }

            return channel;
        }
    }
}