using System.ComponentModel;
using System.Diagnostics;
using System.Runtime.InteropServices;
using App.Metrics;
using Catalogger.Backend.Cache;
using Catalogger.Backend.Database;
using Catalogger.Backend.Extensions;
using Humanizer;
using Microsoft.EntityFrameworkCore;
using Remora.Commands.Attributes;
using Remora.Commands.Groups;
using Remora.Discord.API.Abstractions.Objects;
using Remora.Discord.API.Abstractions.Rest;
using Remora.Discord.Commands.Feedback.Services;
using Remora.Discord.Extensions.Embeds;
using Remora.Discord.Gateway;
using Remora.Results;
using IClock = NodaTime.IClock;
using IResult = Remora.Results.IResult;

namespace Catalogger.Backend.Bot.Commands;

[Group("catalogger")]
public class MetaCommands(
    IClock clock,
    IMetrics metrics,
    DiscordGatewayClient client,
    IFeedbackService feedbackService,
    GuildCacheService guildCache,
    ChannelCacheService channelCache,
    IDiscordRestChannelAPI channelApi) : CommandGroup
{
    [Command("ping")]
    [Description("Ping pong! See the bot's latency")]
    public async Task<IResult> PingAsync()
    {
        var t1 = clock.GetCurrentInstant();
        var msg = await feedbackService.SendContextualAsync("...").GetOrThrow();
        var elapsed = clock.GetCurrentInstant() - t1;

        var process = Process.GetCurrentProcess();
        var memoryUsage = process.WorkingSet64;

        var embed = new EmbedBuilder()
            .WithColour(DiscordUtils.Purple)
            .WithFooter($"{RuntimeInformation.FrameworkDescription} on {RuntimeInformation.RuntimeIdentifier}")
            .WithCurrentTimestamp();
        embed.AddField("Ping", $"Gateway: {client.Latency.Humanize()}\nAPI: {elapsed.ToTimeSpan().Humanize()}",
            inline: true);
        embed.AddField("Memory usage", memoryUsage.Bytes().Humanize(), inline: true);

        var messagesReceived = metrics.Snapshot.GetForContext("Bot").Meters
            .FirstOrDefault(m => m.MultidimensionalName == CataloggerMetrics.MessagesReceived.Name)?.Value;
        if (messagesReceived != null)
            embed.AddField("Messages received", $"{messagesReceived.OneMinuteRate * 60:F1}/m", true);

        var messageCount = metrics.Snapshot.GetForContext("Bot").Gauges
            .FirstOrDefault(m => m.MultidimensionalName == CataloggerMetrics.MessagesStored.Name)?.Value ?? 0;

        embed.AddField("Numbers",
            $"{messageCount:N0} messages from {guildCache.Size:N0} servers\nCached {channelCache.Size:N0} channels",
            inline: false);

        IEmbed[] embeds = [embed.Build().GetOrThrow()];

        return (Result)await channelApi.EditMessageAsync(msg.ChannelID, msg.ID, content: "", embeds: embeds);
    }
}