using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using JD.Collections.Extensions;
using JD.Timeline.Model.Clips;
using JetBrains.Annotations;
using TeaBox;
using JD.Serialization;
using ComboBox = System.Windows.Controls.ComboBox;
using PropertyChangedEventArgs = System.ComponentModel.PropertyChangedEventArgs;
using TextBox = System.Windows.Controls.TextBox;

namespace JD.Timeline.View.Helpers
{
    /// <summary>
    /// Interaction logic for PictogramClipEditionHelper.xaml
    /// </summary>
    public partial class PictogramClipEditionHelper : INotifyPropertyChanged
    {
        #region Variables

        private PictogramModel _currentModel;
        private PictogramClip _clip;
        private Tape _tape;
        private bool _showWatermarkText;
        private bool _isCurrentNameValid;
        private ObservableCollection<object> _modelList = new ObservableCollection<object>();
        private bool _showNameWarning;

        #endregion

        #region Constructor
        public PictogramClipEditionHelper()
        {
            Owner = System.Windows.Application.Current.MainWindow;
        }

        public PictogramClipEditionHelper(Tape tape, bool isModal = true)
        :
        this()
        {
            IsModal = isModal;
            Tape = tape;
            CurrentModel = null;
            Initialize();
        }

        public PictogramClipEditionHelper(PictogramClip clip, bool isModal = false)
        :
        this()
        {
            IsModal = isModal;
            Tape = clip.Tape;
            Clip = clip;
            CurrentModel = clip.Model;
            Initialize();
        }

        #endregion

        #region Properties

        public bool IsModal { get; set; }

        public Tape Tape
        {
            get { return _tape; }
            set
            {
                if (_tape != value)
                {
                    _tape = value;
                    OnPropertyChanged("Tape");
                }
            }
        }

        public new PictogramClip Clip
        {
            get { return _clip; }
            set
            {
                if (_clip != value)
                {
                    _clip = value;
                    OnPropertyChanged("Clip");
                }
            }
        }

        public PictogramModel CurrentModel
        {
            get { return _currentModel; }
            set
            {
                if (_currentModel != value)
                {
                    if (_currentModel != null)
                    {
                        _currentModel.PropertyChanged -= ModelOnPropertyChanged;
                    }
                    _currentModel = value;
                    if (_currentModel != null)
                    {
                        _currentModel.PropertyChanged += ModelOnPropertyChanged;
                    }
                    OnPropertyChanged("CurrentModel");
                }
            }
        }

        public ObservableCollection<object> ModelList
        {
            get { return _modelList; }
            set { _modelList = value; }
        }

        public List<PictogramFlagViewModel> PictoInformations { get; set; }

        public bool ShowWatermarkText
        {
            get { return _showWatermarkText; }
            set
            {
                if (value != _showWatermarkText)
                {
                    _showWatermarkText = value;
                    OnPropertyChanged("ShowWatermarkText");
                }
            }
        }

        public bool IsCurrentNameValid
        {
            get { return _isCurrentNameValid; }
            set
            {
                if (value != _isCurrentNameValid)
                {
                    _isCurrentNameValid = value;
                    OnPropertyChanged("IsCurrentNameValid");
                }
            }
        }

        public bool ShowNameWarning
        {
            get { return _showNameWarning; }
            set
            {
                if (value != _showNameWarning)
                {
                    _showNameWarning = value;
                    OnPropertyChanged("ShowNameWarning");
                }
            }
        }

        #endregion

        #region Methods

        private void Initialize()
        {
            DataContext = this;
            InitializeComponent();
            RefreshModelList();
        }

        public void RefreshModelList()
        {
            _modelList.Clear();
            _modelList.Add(new AddNewPictogramModelAction());
            _modelList.AddRange(Tape.PictogramModels().AsSorted((x, y) => String.Compare(x.Name, y.Name, StringComparison.OrdinalIgnoreCase)));
            _modelComboBox.SelectedItem = CurrentModel ?? _modelComboBox.Items[0];
        }

        private void Window_Deactivated(object sender, EventArgs e)
        {
            if (!IsModal)
            {
                Close();
            }
        }

        private void Window_Activated(object sender, EventArgs e)
        {
            SetCaretAtEndOfTextBox();
        }

        private void OkClick(object sender, RoutedEventArgs e)
        {
            if (IsCurrentNameValid)
            {
                DialogResult = true;
            }
        }

        private void CancelClick(object sender, RoutedEventArgs e)
        {
            DialogResult = false;
        }

        private void Models_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (_modelComboBox.SelectedItem is PictogramModel)
            {
                if (Clip != null)
                {
                    Clip.Model = (PictogramModel)_modelComboBox.SelectedItem;
                }
                CurrentModel = _modelComboBox.SelectedItem as PictogramModel;
                ShowWatermarkText = CurrentModel != null && String.IsNullOrEmpty(CurrentModel.Name);
                _modelComboBox.Text = CurrentModel.Name;
            }
            else if (_modelComboBox.SelectedItem is AddNewPictogramModelAction)
            {
                CurrentModel = null;
                ShowWatermarkText = true;
                IsCurrentNameValid = false;
                _modelComboBox.Text = "";
            }
            SetCaretAtEndOfTextBox();
            RefreshPictoInformations();
        }

        private void ModelOnPropertyChanged(object sender, PropertyChangedEventArgs propertyChangedEventArgs)
        {
            _modelComboBox.Text = CurrentModel.Name;
        }

        private void Models_TextChanged(object sender, TextChangedEventArgs e)
        {
            var comboBox = sender as ComboBox;
            if (comboBox == null)
                return;

            // Checking forbidden chars
            if(!string.IsNullOrEmpty(comboBox.Text))
                foreach (char key in System.IO.Path.GetInvalidFileNameChars())
                    if (comboBox.Text.Contains(key))
                        comboBox.Text = comboBox.Text.Replace(key.ToString(), "");

            IsCurrentNameValid = Tape.PictogramModels()
                                .Where(x => x != CurrentModel)
                                .All(x => x.Name != comboBox.Text)
                                && !String.IsNullOrEmpty(comboBox.Text)
                                && PictogramModel.IsNameValid(comboBox.Text);

            if (IsCurrentNameValid && CurrentModel == null)
            {
                CurrentModel = Tape.GetOrCreatePictogramModel(comboBox.Text);
                RefreshModelList();
            }
            else if (IsCurrentNameValid && CurrentModel != null)
            {
                CurrentModel.Name = comboBox.Text;
            }

            ShowWatermarkText = String.IsNullOrEmpty(comboBox.Text);
            ShowNameWarning = (CurrentModel != null && !IsCurrentNameValid) || (CurrentModel == null && !String.IsNullOrEmpty(comboBox.Text) && !IsCurrentNameValid);
            RefreshPictoInformations();
        }

        private void RefreshPictoInformations()
        {
            _pictoFlags.Items.Clear();
            if (CurrentModel != null)
            {
                foreach (var info in Enum.GetValues(typeof(PictogramFlag)).Cast<PictogramFlag>().Where(x => x != PictogramFlag.None))
                {
                    _pictoFlags.Items.Add(
                        new PictogramFlagViewModel
                        {
                            Model = CurrentModel,
                            Flag = info,
                            IconUri = new Uri($"pack://application:,,,/JD.Timeline;component/Resources/Icon_64x64_picto_{info.ToString()}.png")
                        }
                    );
                }
            }
        }

        private void SetCaretAtEndOfTextBox()
        {
            var textBox = (_modelComboBox.Template.FindName("PART_EditableTextBox", _modelComboBox) as TextBox);
            if (textBox != null)
            {
                textBox.Focus();
                textBox.Select(textBox.Text.Length, 0);
            }
        }

        public bool ShowSnapshotButton
        {
            get { return !IsModal; }
        }
        
        public bool ShowEditButton
        {
            get { return !IsModal && CurrentModel != null; }
        }

        #endregion
        
        #region Events

        public event PropertyChangedEventHandler PropertyChanged;

        [NotifyPropertyChangedInvocator]
        protected virtual void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
        }

        private void SnapshotButton_Click(object sender, RoutedEventArgs e)
        {
            if (CurrentModel != null)
            {
                CurrentModel.BitmapHandler().TakeSnapshotFromVideo();
            }
        }

        private void EditButton_Click(object sender, RoutedEventArgs e)
        {
            if (CurrentModel != null)
            {
                CurrentModel.BitmapHandler().EditPictogram();
            }
        }

        #endregion
    }

    #region WPF classes

    /// <summary>
    /// Represents a pictogram information item
    /// </summary>
    public class PictogramFlagViewModel
    {
        public PictogramFlag Flag { get; set; }
        public Uri IconUri { get; set; }
        public PictogramModel Model { get; set; }

        public bool IsChecked
        {
            get
            {
                return Model != null && (Model.Flags & Flag) == Flag;
            }
            set
            {
                if (Model != null)
                {
                    if (value)
                    {
                        Model.Flags |= Flag;
                    }
                    else
                    {
                        Model.Flags &= ~Flag;
                    }
                }
            }
        }
    }

    /// <summary>
    /// Represents the entry in combobox to add a new model
    /// </summary>
    public class AddNewPictogramModelAction
    {
        public override string ToString()
        {
            return "";
        }
    }

    /// <summary>
    /// Used to select the correct DataTemplate regarding the type of entry in combobox 
    /// </summary>
    public class PictogramModelHelperTemplateSelector : DataTemplateSelector
    {
        public DataTemplate PictogramModelDataTemplate { get; set; }
        public DataTemplate CreatePictogramModelDataTemplate { get; set; }

        public override DataTemplate SelectTemplate(object item, DependencyObject container)
        {
            if (item is AddNewPictogramModelAction)
                return CreatePictogramModelDataTemplate;
            return PictogramModelDataTemplate;
        }

    }

    #endregion
}