// Copyright (C) 2021-present sam (starshines.gay)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

using Catalogger.Backend.Cache.InMemoryCache;
using Catalogger.Backend.Database;
using Catalogger.Backend.Database.Queries;
using Catalogger.Backend.Extensions;
using Catalogger.Backend.Services;
using Remora.Discord.API.Abstractions.Gateway.Events;
using Remora.Discord.Extensions.Embeds;
using Remora.Discord.Gateway.Responders;
using Remora.Results;

namespace Catalogger.Backend.Bot.Responders.Guilds;

public class GuildBanAddResponder(
    ILogger logger,
    DatabaseContext db,
    WebhookExecutorService webhookExecutor,
    UserCache userCache,
    AuditLogCache auditLogCache,
    PluralkitApiService pluralkitApi
) : IResponder<IGuildBanAdd>
{
    private readonly ILogger _logger = logger.ForContext<GuildBanAddResponder>();

    public async Task<Result> RespondAsync(IGuildBanAdd evt, CancellationToken ct = default)
    {
        var guildConfig = await db.GetGuildAsync(evt.GuildID, ct);

        // Delay 2 seconds for the audit log
        await Task.Delay(2000, ct);

        var embed = new EmbedBuilder()
            .WithTitle("User banned")
            .WithAuthor(evt.User.Tag(), null, evt.User.AvatarUrl())
            .WithDescription($"<@{evt.User.ID}>")
            .WithColour(DiscordUtils.Red)
            .WithFooter($"User ID: {evt.User.ID}")
            .WithCurrentTimestamp();

        if (auditLogCache.TryGetBan(evt.GuildID, evt.User.ID, out var actionData))
        {
            embed.AddField(
                "Responsible moderator",
                await userCache.TryFormatUserAsync(actionData.ModeratorId)
            );
            embed.AddField("Reason", actionData.Reason ?? "No reason given");
        }
        else
        {
            embed.AddField("Responsible moderator", "*(unknown)*");
            embed.AddField("Reason", "*(unknown)*");
        }

        // Get PluralKit system, if any, and add it to the guild's banned systems list
        var pkSystem = await pluralkitApi.GetPluralKitSystemAsync(evt.User.ID.Value, ct);
        if (pkSystem != null)
        {
            if (!guildConfig.IsSystemBanned(pkSystem))
            {
                _logger.Information(
                    "PluralKit system {SystemHid} will be banned from guild {GuildId}",
                    pkSystem.Id,
                    evt.GuildID
                );
                guildConfig.BannedSystems.Add(pkSystem.Id);
                guildConfig.BannedSystems.Add(pkSystem.Uuid.ToString());
                db.Update(guildConfig);
                await db.SaveChangesAsync(ct);
            }

            embed.AddField(
                "PluralKit system",
                $"""
                **ID:** {pkSystem.Id}
                **UUID:** `{pkSystem.Uuid}`
                **Name:** {pkSystem.Name ?? "*(none)*"}
                **Tag:** {pkSystem.Tag ?? "*(none)*"}

                This system has been marked as banned. You will be warned if another account linked to this system joins.
                """
            );
        }

        webhookExecutor.QueueLog(
            guildConfig,
            LogChannelType.GuildBanAdd,
            embed.Build().GetOrThrow()
        );
        return Result.Success;
    }
}