/*
 * Copyright (c) 2023 Proton AG
 *
 * This file is part of ProtonVPN.
 *
 * ProtonVPN 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.
 *
 * ProtonVPN 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 ProtonVPN.  If not, see <https://www.gnu.org/licenses/>.
 */

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Linq;
using ProtonVPN.Logging.Contracts;

namespace ProtonVPN.Common.Legacy.OS.Processes;

public class SystemProcesses : IOsProcesses
{
    private readonly ILogger _logger;

    public SystemProcesses(ILogger logger)
    {
        _logger = logger;
    }

    public IOsProcess Process(string filename, string arguments)
    {
        var process = CreateProcess(filename, arguments);
        return new SystemProcess(_logger, process);
    }

    public IOsProcess ElevatedProcess(string filename, string arguments)
    {
        var process = CreateElevatedProcess(filename, arguments);
        return new SystemProcess(_logger, process);
    }

    public IOsProcess CommandLineProcess(string arguments)
    {
        return new CmdOutputProcess(_logger, new Process
        {
            StartInfo = new ProcessStartInfo("cmd.exe", arguments).NoRedirectInfo()
        });
    }

    public IOsProcess ElevatedCommandLineProcess(string arguments)
    {
        return new CmdOutputProcess(_logger, new Process
        {
            StartInfo = new ProcessStartInfo("cmd.exe", arguments).ElevatedInfo()
        });
    }

    public IOsProcess[] ProcessesByName(string filename)
    {
        var name = GetProcessName(filename);
        return GetProcessesByName(name).Select(p => (IOsProcess)new SystemProcess(_logger, p)).ToArray();
    }

    public IOsProcess[] ProcessesByPath(string path)
    {
        var filename = Path.GetFileNameWithoutExtension(path) ?? string.Empty;
        var list = System.Diagnostics.Process.GetProcessesByName(filename);
        var result = new List<IOsProcess>();

        foreach (var p in list)
        {
            try
            {
                if (p.MainModule?.FileName == path)
                {
                    result.Add(new SystemProcess(_logger, p));
                }
                else
                {
                    p.Dispose();
                }
            }
            catch (Win32Exception)
            {
                p.Dispose();
            }
        }

        return result.ToArray();
    }

    public void Open(string filename)
    {
        try
        {
            System.Diagnostics.Process.Start(new ProcessStartInfo
            {
                FileName = filename,
                UseShellExecute = true
            });
        }
        catch (Win32Exception)
        {
        }
    }

    private Process CreateProcess(string filename, string arguments)
    {
        return new Process
        {
            StartInfo = new ProcessStartInfo(filename, arguments).StandardInfo(),
            EnableRaisingEvents = true
        };
    }

    private Process CreateElevatedProcess(string filename, string arguments)
    {
        return new Process
        {
            StartInfo =
            {
                FileName = filename,
                Arguments = arguments,
                CreateNoWindow = true,
                UseShellExecute = true,
                Verb = "runas",
                WorkingDirectory = Environment.CurrentDirectory
            },
            EnableRaisingEvents = true
        };
    }

    private Process[] GetProcessesByName(string name)
    {
        return System.Diagnostics.Process.GetProcessesByName(name);
    }

    private string GetProcessName(string filename)
    {
        return Path.GetFileNameWithoutExtension(filename);
    }
}