// Copyright © 2017-2026 QL-Win Contributors
//
// This file is part of QuickLook program.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using QuickLook.Common.NativeMethods;
using System;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Threading.Tasks;
using System.Windows;

namespace QuickLook.Common.Helpers;

public static class ProcessHelper
{
    private const int ErrorInsufficientBuffer = 0x7A;

    public static void PerformAggressiveGC()
    {
        // delay some time to make sure that all windows are closed
        Task.Delay(2000).ContinueWith(t => GC.Collect(GC.MaxGeneration));
    }

    public static bool IsRunningAsUWP()
    {
        if (Environment.OSVersion.Version < new Version(6, 2)) // Windows 8
            return false;

        try
        {
            uint len = 0;
            var r = Kernel32.GetCurrentPackageFullName(ref len, null);

            return r == ErrorInsufficientBuffer;
        }
        catch (EntryPointNotFoundException)
        {
            return false;
        }
    }

    public static bool IsOnWindows10S()
    {
        const uint PRODUCT_CLOUD = 0x000000B2; // Windows 10 S
        const uint PRODUCT_CLOUDN = 0x000000B3; // Windows 10 S N

        Kernel32.GetProductInfo(Environment.OSVersion.Version.Major,
            Environment.OSVersion.Version.Minor, 0, 0, out var osType);

        return osType == PRODUCT_CLOUD || osType == PRODUCT_CLOUDN;
    }

    public static bool IsShuttingDown()
    {
        var isShuttingDownProperty =
            typeof(Application).GetProperty("IsShuttingDown", BindingFlags.NonPublic | BindingFlags.Static);
        if (isShuttingDownProperty == null)
            throw new Exception("Unable to detect Application.IsShuttingDown.");
        return (bool)isShuttingDownProperty.GetValue(Application.Current);
    }

    public static void WriteLog(string msg)
    {
        Debug.WriteLine(msg);

        var logFilePath = Path.Combine(SettingHelper.LocalDataPath, @"QuickLook.Exception.log");

        using var writer = new StreamWriter(new FileStream(logFilePath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.Read));
        writer.BaseStream.Seek(0, SeekOrigin.End);

        writer.WriteLine($"========{DateTime.Now}========");
        writer.WriteLine(msg);
        writer.WriteLine();
    }
}