using System.ComponentModel;
using System.Diagnostics;
using Catalogger.Backend.Cache;
using Catalogger.Backend.Database;
using Catalogger.Backend.Extensions;
using Humanizer;
using Microsoft.EntityFrameworkCore;
using NodaTime;
using Remora.Commands.Attributes;
using Remora.Commands.Groups;
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 IResult = Remora.Results.IResult;

namespace Catalogger.Backend.Bot.Commands;

[Group("catalogger")]
public class MetaCommands(
    IClock clock,
    DatabaseContext db,
    DiscordGatewayClient client,
    GuildCacheService guildCache,
    ChannelCacheService channelCache,
    IFeedbackService feedbackService,
    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 messageCount = await db.Messages.CountAsync();
        var process = Process.GetCurrentProcess();
        var memoryUsage = process.WorkingSet64;
        var virtualMemory = process.VirtualMemorySize64;

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

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

        return (Result)await channelApi.EditMessageAsync(msg.ChannelID, msg.ID,
            content: $"Pong! API: {elapsed.TotalMilliseconds:N0}ms | Gateway: {client.Latency.TotalMilliseconds:N0}ms");
    }
}