// ----------------------------------------------------------------------------------------------
//     _                _      _  ____   _                           _____
//    / \    _ __  ___ | |__  (_)/ ___| | |_  ___   __ _  _ __ ___  |  ___|__ _  _ __  _ __ ___
//   / _ \  | '__|/ __|| '_ \ | |\___ \ | __|/ _ \ / _` || '_ ` _ \ | |_  / _` || '__|| '_ ` _ \
//  / ___ \ | |  | (__ | | | || | ___) || |_|  __/| (_| || | | | | ||  _|| (_| || |   | | | | | |
// /_/   \_\|_|   \___||_| |_||_||____/  \__|\___| \__,_||_| |_| |_||_|   \__,_||_|   |_| |_| |_|
// ----------------------------------------------------------------------------------------------
// |
// Copyright 2015-2024 Łukasz "JustArchi" Domeradzki
// Contact: JustArchi@JustArchi.net
// |
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// |
// http://www.apache.org/licenses/LICENSE-2.0
// |
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

using System;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using ArchiSteamFarm.Localization;
using ArchiSteamFarm.Steam;
using JetBrains.Annotations;
using NLog;
using NLog.Config;
using NLog.Layouts;
using NLog.Targets;

namespace ArchiSteamFarm.NLog.Targets;

[SuppressMessage("ReSharper", "ClassNeverInstantiated.Global")]
[Target(TargetName)]
internal sealed class SteamTarget : AsyncTaskTarget {
	internal const string TargetName = "Steam";

	// This is NLog config property, it must have public get() and set() capabilities
	[UsedImplicitly]
	public Layout? BotName { get; set; }

	// This is NLog config property, it must have public get() and set() capabilities
	[UsedImplicitly]
	public ulong ChatGroupID { get; set; }

	// This is NLog config property, it must have public get() and set() capabilities
	[RequiredParameter]
	[UsedImplicitly]
	public ulong SteamID { get; set; }

	// This parameter-less constructor is intentionally public, as NLog uses it for creating targets
	// It must stay like this as we want to have our targets defined in our NLog.config
	// Keeping date in default layout also doesn't make much sense (Steam offers that), so we remove it by default
	public SteamTarget() => Layout = "${level:uppercase=true}|${logger}|${message}";

	protected override async Task WriteAsyncTask(LogEventInfo logEvent, CancellationToken cancellationToken) {
		ArgumentNullException.ThrowIfNull(logEvent);

		Write(logEvent);

		if ((SteamID == 0) || (Bot.Bots == null) || Bot.Bots.IsEmpty) {
			return;
		}

		string message = Layout.Render(logEvent);

		if (string.IsNullOrEmpty(message)) {
			return;
		}

		Bot? bot = null;

		string? botName = BotName?.Render(logEvent);

		if (!string.IsNullOrEmpty(botName)) {
			bot = Bot.GetBot(botName);

			if (bot?.IsConnectedAndLoggedOn != true) {
				return;
			}
		}

		Task task;

		if (ChatGroupID != 0) {
			task = SendGroupMessage(message, bot);
		} else if (bot?.SteamID != SteamID) {
			task = SendPrivateMessage(message, bot);
		} else {
			return;
		}

		await task.ConfigureAwait(false);
	}

	private async Task SendGroupMessage(string message, Bot? bot = null) {
		ArgumentException.ThrowIfNullOrEmpty(message);

		if (bot == null) {
			bot = Bot.Bots?.Values.FirstOrDefault(static targetBot => targetBot.IsConnectedAndLoggedOn);

			if (bot == null) {
				return;
			}
		}

		if (!await bot.SendMessage(ChatGroupID, SteamID, message).ConfigureAwait(false)) {
			bot.ArchiLogger.LogGenericTrace(Strings.FormatWarningFailedWithError(nameof(Bot.SendMessage)));
		}
	}

	private async Task SendPrivateMessage(string message, Bot? bot = null) {
		ArgumentException.ThrowIfNullOrEmpty(message);

		if (bot == null) {
			bot = Bot.Bots?.Values.FirstOrDefault(targetBot => targetBot.IsConnectedAndLoggedOn && (targetBot.SteamID != SteamID));

			if (bot == null) {
				return;
			}
		}

		if (!await bot.SendMessage(SteamID, message).ConfigureAwait(false)) {
			bot.ArchiLogger.LogGenericTrace(Strings.FormatWarningFailedWithError(nameof(Bot.SendMessage)));
		}
	}
}
