using System;
using System.Diagnostics;
using System.IO;

namespace SourceGit.Native {
    public static class OS {
        public interface IBackend {
            string FindGitInstallDir();
            string FindVSCode();

            void OpenTerminal(string workdir);
            void OpenInFileManager(string path, bool select);
            void OpenBrowser(string url);
            void OpenWithDefaultEditor(string file);
        }

        public static string GitInstallDir {
            get;
            set;
        }

        public static string GitExecutableFile {
            get => Path.Combine(GitInstallDir, "bin", OperatingSystem.IsWindows() ? "git.exe" : "git");
        }

        public static string VSCodeExecutableFile {
            get;
            set;
        }

        static OS() {
            if (OperatingSystem.IsMacOS()) {
                _backend = new MacOS();
                VSCodeExecutableFile = _backend.FindVSCode();
            } else if (OperatingSystem.IsWindows()) {
                _backend = new Windows();
                VSCodeExecutableFile = _backend.FindVSCode();
            } else {
                throw new Exception("Platform unsupported!!!");
            }
        }

        public static string FindGitInstallDir() {
            return _backend?.FindGitInstallDir();
        }

        public static void OpenInFileManager(string path, bool select = false) {
            _backend?.OpenInFileManager(path, select);
        }

        public static void OpenBrowser(string url) {
            _backend?.OpenBrowser(url);
        }

        public static void OpenTerminal(string workdir) {
            _backend?.OpenTerminal(workdir);
        }

        public static void OpenWithDefaultEditor(string file) {
            _backend?.OpenWithDefaultEditor(file);
        }

        public static void OpenInVSCode(string repo) {
            if (string.IsNullOrEmpty(VSCodeExecutableFile)) {
                App.RaiseException(repo, "Visual Studio Code can NOT be found in your system!!!");
                return;
            }

            Process.Start(new ProcessStartInfo() {
                WorkingDirectory = repo,
                FileName = VSCodeExecutableFile,
                Arguments = $"\"{repo}\"",
                UseShellExecute = false,
            });
        }

        private static IBackend _backend = null;
    }
}