//     _                _      _  ____   _                           _____
//    / \    _ __  ___ | |__  (_)/ ___| | |_  ___   __ _  _ __ ___  |  ___|__ _  _ __  _ __ ___
//   / _ \  | '__|/ __|| '_ \ | |\___ \ | __|/ _ \ / _` || '_ ` _ \ | |_  / _` || '__|| '_ ` _ \
//  / ___ \ | |  | (__ | | | || | ___) || |_|  __/| (_| || | | | | ||  _|| (_| || |   | | | | | |
// /_/   \_\|_|   \___||_| |_||_||____/  \__|\___| \__,_||_| |_| |_||_|   \__,_||_|   |_| |_| |_|
// |
// Copyright 2015-2021 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.Composition;
using System.Diagnostics.CodeAnalysis;
using System.Runtime;
using System.Threading;
using ArchiSteamFarm.Core;
using ArchiSteamFarm.Plugins.Interfaces;

namespace ArchiSteamFarm.CustomPlugins.PeriodicGC {
	[Export(typeof(IPlugin))]
	[SuppressMessage("ReSharper", "UnusedType.Global")]
	internal sealed class PeriodicGCPlugin : IPlugin {
		private const byte GCPeriod = 60; // In seconds

		private static readonly object LockObject = new();
		private static readonly Timer PeriodicGCTimer = new(PerformGC);

		public string Name => nameof(PeriodicGCPlugin);

		public Version Version => typeof(PeriodicGCPlugin).Assembly.GetName().Version ?? throw new InvalidOperationException(nameof(Version));

		public void OnLoaded() {
			TimeSpan timeSpan = TimeSpan.FromSeconds(GCPeriod);

			ASF.ArchiLogger.LogGenericWarning("Periodic GC will occur every " + timeSpan.ToHumanReadable() + ". Please keep in mind that this plugin should be used for debugging tests only.");

			lock (LockObject) {
				PeriodicGCTimer.Change(timeSpan, timeSpan);
			}
		}

		private static void PerformGC(object? state) {
			ASF.ArchiLogger.LogGenericWarning("Performing GC, current memory: " + (GC.GetTotalMemory(false) / 1024) + " KB.");

			lock (LockObject) {
				GCSettings.LargeObjectHeapCompactionMode = GCLargeObjectHeapCompactionMode.CompactOnce;
				GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced, true, true);
			}

			ASF.ArchiLogger.LogGenericWarning("GC finished, current memory: " + (GC.GetTotalMemory(false) / 1024) + " KB.");
		}
	}
}