using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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 UAF.Application;
using System.Globalization;
using System.Reflection;
using UAF.WPF.Themes;

namespace DataFileAnalyzer 
{
    /// <summary>
    /// File library status to color
    /// </summary>
    public class StatusToColorConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (!(value is FileUpdaterStatus))
                return ThemeManager.GetGlobalThemeResource<Brush>("WhiteBrush");
            FileUpdaterStatus strValue = (FileUpdaterStatus)value;
            if (strValue == FileUpdaterStatus.STARTING)
                return ThemeManager.GetGlobalThemeResource<Brush>("OrangeBrush");
            if (strValue == FileUpdaterStatus.INITIALIZING)
                return ThemeManager.GetGlobalThemeResource<Brush>("OrangeBrush");
            if (strValue == FileUpdaterStatus.RUNNING)
                return ThemeManager.GetGlobalThemeResource<Brush>("YellowBrush");
            if (strValue == FileUpdaterStatus.READY)
                return ThemeManager.GetGlobalThemeResource<Brush>("GreenBrush");
            if (strValue == FileUpdaterStatus.PAUSED)
                return ThemeManager.GetGlobalThemeResource<Brush>("RedBrush");
            if (strValue == FileUpdaterStatus.STOPPED)
                return ThemeManager.GetGlobalThemeResource<Brush>("RedBrush");
            return ThemeManager.GetGlobalThemeResource<Brush>("WhiteBrush");
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotSupportedException();
        }
    }

    /// <summary>
    /// List of DataFileError to string
    /// </summary>
    public class DataFileErrorListToStringConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            List<DataFileError> errorList = value as List<DataFileError>;
            string result = "";
            foreach (DataFileError error in errorList)
            {
                result += ((result.Length != 0) ? ", " : "") + error;
            }
            return result;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotSupportedException();
        }
    }

    /// <summary>
    /// DataFile to a string containing the errors and warnings of this file
    /// </summary>
    public class DataFileToErrorListConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            DataFile dataFile = value as DataFile;
            string result = null;
            if (dataFile != null && (dataFile.Warnings.Count != 0 || dataFile.Errors.Count != 0))
            {
                if (dataFile.Errors.Count != 0)
                {
                    result = "";
                    bool needComa = false;
                    foreach (DataFileError error in dataFile.Errors)
                    {
                        result += (needComa ? ", " : "") + error;
                        needComa = true;
                    }
                }
                
                else if (dataFile.Warnings.Count != 0)
                {
                    result = "";
                    bool needComa = false;
                    foreach (DataFileError error in dataFile.Warnings)
                    {
                        result += (needComa ? ", " : "") + error;
                        needComa = true;
                    }
                }

            }

            return result;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotSupportedException();
        }
    }

    /// <summary>
    /// Get the pause button state depending on the status
    /// </summary>
    public class StatusToPauseButtonTextConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            string strValue = value as string;
            return (strValue == "PAUSED") ? "Resume" : "Pause";
        }
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotSupportedException();
        }
    }

    /// <summary>
    /// The main view of the DataFileAnalyzer
    /// </summary>
    public partial class DataFileAnalyzerView : UserControl
    {
        public DataFileAnalyzerModel Model { get { return DataContext as DataFileAnalyzerModel; } }

        /// <summary>
        /// Constructor
        /// </summary>
        public DataFileAnalyzerView()
        {
            InitializeComponent();
        }

        /// <summary>
        /// Save file library state
        /// </summary>
        private void SaveFileListClick(object sender, RoutedEventArgs e)
        {
            Model.Library.Save();
        }

        /// <summary>
        /// Pause the file library update
        /// </summary>
        private void PauseUpdateClick(object sender, RoutedEventArgs e)
        {
            if (Model.Library.Paused)
            {
                Model.Library.Resume();
            }
            else
            {
                Model.Library.Pause();
                Model.RefreshFileList();
            }
        }

        /// <summary>
        /// Double click on a referenced file: select this file in the file list
        /// </summary>
        private void OnReferencedFileDoubleClick(object sender, MouseButtonEventArgs e)
        {
            DataFileDependency dependency = ((ListViewItem)sender).Content as DataFileDependency;
            DataFile parentFile = Model.Library.GetFile(dependency.Key);
            if (parentFile != null)
            {
                Model.FilterString = parentFile.NormalizedPath;

                ScrollToFile(parentFile);
                uiFileList.SelectedItem = parentFile;
                uiFileList.Focus();
            }
        }

        /// <summary>
        /// Double click on a referencing file: select this file in the file list
        /// </summary>
        private void OnReferencingFileDoubleClick(object sender, MouseButtonEventArgs e)
        {
            DataFileDependency dependency = ((ListViewItem)sender).Content as DataFileDependency;
            DataFile childFile = Model.Library.GetFile(dependency.Key);
            if (childFile != null)
            {
                Model.FilterString = childFile.NormalizedPath;

                ScrollToFile(childFile);
                uiFileList.SelectedItem = childFile;
                uiFileList.Focus();
            }
        }

        /// <summary>
        /// Scroll to a file in the file list
        /// </summary>
        private void ScrollToFile(DataFile _file)
        {
            // This doesn't work well when virtualization is activated
            //uiFileList.ScrollIntoView(_file);

            VirtualizingStackPanel vsp =
              (VirtualizingStackPanel)typeof(ItemsControl).InvokeMember("_itemsHost",
               BindingFlags.Instance | BindingFlags.GetField | BindingFlags.NonPublic, null,
               uiFileList, null);

            int index = Model.CurrentDataFiles.IndexOf(_file);
            double scrollHeight = vsp.ScrollOwner.ScrollableHeight;
            double offset = index * scrollHeight / uiFileList.Items.Count;

            vsp.SetVerticalOffset(offset);
        }

        private void FileList_GotFocus(object sender, RoutedEventArgs e)
        {
            if (Model != null)
                Model.ActiveView = DataFileAnalyzerModel.FocusedView.FileView;
        }

        private void FileList_LostFocus(object sender, RoutedEventArgs e)
        {
            if (Model != null)
                Model.ActiveView = DataFileAnalyzerModel.FocusedView.Other;
        }

        private void FileList_PreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            uiFileList.Focus();
        }

        private void ReferencedFileList_GotFocus(object sender, RoutedEventArgs e)
        {
            if (Model != null)
                Model.ActiveView = DataFileAnalyzerModel.FocusedView.ReferencedByMeView;
        }

        private void ReferencedFileList_LostFocus(object sender, RoutedEventArgs e)
        {
            if (Model != null)
                Model.ActiveView = DataFileAnalyzerModel.FocusedView.Other;
        }

        private void ReferencedFileList_PreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            uiReferencedFileList.Focus();
        }

        private void ReferencingFileList_GotFocus(object sender, RoutedEventArgs e)
        {
            if (Model != null) 
                Model.ActiveView = DataFileAnalyzerModel.FocusedView.ReferencingMeView;
        }

        private void ReferencingFileList_LostFocus(object sender, RoutedEventArgs e)
        {
            if (Model != null)
                Model.ActiveView = DataFileAnalyzerModel.FocusedView.Other;
        }

        private void ReferencingFileList_PreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            uiReferencingFileList.Focus();
        }
    }
}