using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Microsoft.Win32;

namespace ExeLauncher.GUI
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        private string _appName = "Run";

        public string ApplicationName
        {
            get => _appName;
            set
            {
                if (_appName != value)
                {
                    _appName = value;

                    NotifyPropertyChanged();
                }
            }
        }

        private string _applicationIconPath = "";

        public string ApplicationIconPath
        {
            get => _applicationIconPath;
            set
            {
                if (_applicationIconPath != value)
                {
                    _applicationIconPath = value;

                    NotifyPropertyChanged();
                }
            }
        }

        public ObservableCollection<ApplicationModel> Applications { get; set; }

        private readonly ExeGenerator _exeGenerator;

        public MainWindow()
        {
            _exeGenerator = new ExeGenerator();

            Applications = new ObservableCollection<ApplicationModel>()
            {
                new ApplicationModel()
            };

            InitializeComponent();
        }

        private void Button_Icon(object sender, RoutedEventArgs e)
        {
            ApplicationIconPath = Program.GetIcon();
        }

        private void Button_Add(object sender, RoutedEventArgs e)
        {
            Applications.Add(new ApplicationModel() { Number = Applications.Count + 1 });
        }

        private void Button_Remove(object sender, RoutedEventArgs e)
        {
            if (Applications.Count > 1)
            {
                Applications.RemoveAt(Applications.Count - 1);
            }
        }

        private void Button_Generate(object sender, RoutedEventArgs e)
        {
            if (!CheckApplications())
            {
                MessageBox.Show("Path and working directory cannot be empty!", "Invalid path or working directory", MessageBoxButton.OK, MessageBoxImage.Error);

                return;
            }

            Generate();
        }

        private void Generate()
        {
            var dialog = new SaveFileDialog()
            {
                AddExtension = true,
                DefaultExt = ".exe",
                FileName = $"{ApplicationName}.exe",
                Filter = "Executable|*.exe",
                OverwritePrompt = true
            };

            if (dialog.ShowDialog() == true)
            {
                var paths = string.Join("$", Applications.Select(app => app.Path));
                var arguments = string.Join("$", Applications.Select(app => app.Arguments));
                var workingDirectories = string.Join("$", Applications.Select(app => app.WorkingDirectory));

                var errors = _exeGenerator.CreateExecutable(dialog.FileName, paths, arguments, workingDirectories, ApplicationIconPath);

                if (errors != null)
                {
                    var message = GenerateErrorMessage(errors);

                    MessageBox.Show(message, "Compilation error", MessageBoxButton.OK, MessageBoxImage.Error);
                }
            }
        }

        private string GenerateErrorMessage(System.CodeDom.Compiler.CompilerErrorCollection errors)
        {
            var builder = new StringBuilder();

            builder.AppendLine("An error occured while compiling the executable: ");

            foreach (var compilerError in errors)
            {
                builder.AppendLine($"\t{compilerError}");
                builder.AppendLine();
            }

            return builder.ToString();
        }

        private bool CheckApplications()
        {
            foreach (var app in Applications)
            {
                if (string.IsNullOrWhiteSpace(app.Path) || string.IsNullOrWhiteSpace(app.WorkingDirectory))
                {
                    return false;
                }
            }

            return true;
        }
        private void NotifyPropertyChanged([CallerMemberName] string propertyName = "")
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}