#region License Information (GPL v3)

/*
    ShareX - A program that allows you to take screenshots and share any file type
    Copyright (c) 2007-2024 ShareX Team

    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 2
    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, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

    Optionally you can also view the license at <http://www.gnu.org/licenses/>.
*/

#endregion License Information (GPL v3)

using System;
using System.Diagnostics;
using System.IO;
using System.Threading.Tasks;

namespace ShareX.HelpersLib
{
    public class ExternalProgram
    {
        public bool IsActive { get; set; }
        public string Name { get; set; }
        public string Path { get; set; }
        public string Args { get; set; }
        public string OutputExtension { get; set; }
        public string Extensions { get; set; }
        public bool HiddenWindow { get; set; }
        public bool DeleteInputFile { get; set; }

        private string pendingInputFilePath;

        public ExternalProgram()
        {
            Args = '"' + CodeMenuEntryActions.input.ToPrefixString() + '"';
        }

        public ExternalProgram(string name, string path) : this()
        {
            Name = name;
            Path = path;
        }

        public string GetFullPath()
        {
            return FileHelpers.ExpandFolderVariables(Path);
        }

        public string Run(string inputPath)
        {
            pendingInputFilePath = null;
            string path = GetFullPath();

            if (!string.IsNullOrEmpty(path) && File.Exists(path) && !string.IsNullOrWhiteSpace(inputPath))
            {
                inputPath = inputPath.Trim('"');

                if (CheckExtension(inputPath))
                {
                    try
                    {
                        string outputPath = inputPath;

                        string arguments;

                        if (string.IsNullOrEmpty(Args))
                        {
                            arguments = '"' + inputPath + '"';
                        }
                        else
                        {
                            if (!string.IsNullOrWhiteSpace(OutputExtension))
                            {
                                outputPath = System.IO.Path.Combine(System.IO.Path.GetDirectoryName(inputPath), System.IO.Path.GetFileNameWithoutExtension(inputPath));

                                if (!OutputExtension.StartsWith("."))
                                {
                                    outputPath += ".";
                                }

                                outputPath += OutputExtension;
                            }

                            arguments = CodeMenuEntryActions.Parse(Args, inputPath, outputPath);
                        }

                        using (Process process = new Process())
                        {
                            ProcessStartInfo psi = new ProcessStartInfo()
                            {
                                FileName = path,
                                Arguments = arguments,
                                UseShellExecute = false,
                                CreateNoWindow = HiddenWindow
                            };

                            DebugHelper.WriteLine($"Action input: \"{inputPath}\" [{FileHelpers.GetFileSizeReadable(inputPath)}]");
                            DebugHelper.WriteLine($"Action run: \"{psi.FileName}\" {psi.Arguments}");

                            process.StartInfo = psi;
                            process.Start();
                            process.WaitForExit();
                        }

                        if (!string.IsNullOrEmpty(outputPath) && File.Exists(outputPath))
                        {
                            DebugHelper.WriteLine($"Action output: \"{outputPath}\" [{FileHelpers.GetFileSizeReadable(outputPath)}]");

                            if (DeleteInputFile && !inputPath.Equals(outputPath, StringComparison.OrdinalIgnoreCase))
                            {
                                pendingInputFilePath = inputPath;
                            }

                            return outputPath;
                        }

                        return inputPath;
                    }
                    catch (Exception e)
                    {
                        DebugHelper.WriteException(e);
                    }
                }
            }

            return null;
        }

        public Task<string> RunAsync(string inputPath)
        {
            return Task.Run(() => Run(inputPath));
        }

        public bool CheckExtension(string path)
        {
            return CheckExtension(path, Extensions);
        }

        public bool CheckExtension(string path, string extensions)
        {
            if (!string.IsNullOrWhiteSpace(path))
            {
                if (string.IsNullOrWhiteSpace(extensions))
                {
                    return true;
                }

                int index = 0;

                for (int i = 0; i <= extensions.Length; ++i)
                {
                    if (i == extensions.Length || !char.IsLetterOrDigit(extensions[i]))
                    {
                        if (i > index)
                        {
                            string extension = "." + extensions.Substring(index, i - index);

                            if (path.EndsWith(extension, StringComparison.OrdinalIgnoreCase))
                            {
                                return true;
                            }
                        }

                        index = i + 1;
                    }
                }
            }

            return false;
        }

        public void DeletePendingInputFile()
        {
            string inputPath = pendingInputFilePath;

            if (!string.IsNullOrEmpty(inputPath) && File.Exists(inputPath))
            {
                DebugHelper.WriteLine($"Deleting input file: \"{inputPath}\"");

                try
                {
                    File.Delete(inputPath);
                    pendingInputFilePath = null;
                }
                catch (Exception e)
                {
                    DebugHelper.WriteException(e);
                }
            }
        }
    }
}