using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
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 bsmd.database;

namespace ENI2.Controls
{
    /// <summary>
    /// Interaction logic for ValueMappingsControl.xaml
    /// </summary>
    public partial class ValueMappingsControl : UserControl
    {
        private readonly ObservableCollection<ValueMapping> _mappings = new ObservableCollection<ValueMapping>();
        private DataGridCellInfo activeCellAtEdit;

        public ValueMappingsControl()
        {
            InitializeComponent();
        }

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            this.comboBoxType.ItemsSource = Enum.GetValues(typeof(ValueMapping.MappingType)).Cast<ValueMapping.MappingType>();
            this.dataGridValueMappings.ItemsSource = _mappings;

            this.dataGridValueMappings.ContextMenu = new ContextMenu();
            MenuItem addItem = new MenuItem
            {
                Header = Properties.Resources.textAdd,
                Icon = new Image { Source = new BitmapImage(new Uri("pack://application:,,,/Resources/add.png")) }
            };
            
            addItem.Click += AddItem_Click;
            this.dataGridValueMappings.ContextMenu.Items.Add(addItem);

            MenuItem delItem = new MenuItem
            {
                Header = Properties.Resources.textDelete,
                Icon = new Image { Source = new BitmapImage(new Uri("pack://application:,,,/Resources/delete.png")) }
            };
            
            delItem.Click += DelItem_Click;
            this.dataGridValueMappings.ContextMenu.Items.Add(delItem);
        }

        private async void DelItem_Click(object sender, RoutedEventArgs e)
        {
            if (this.dataGridValueMappings.SelectedItem is ValueMapping vm)
            {
                if (MessageBox.Show($"Are you sure to delete {vm.Key} -> {vm.Value}?", Properties.Resources.textConfirmation, MessageBoxButton.YesNo, MessageBoxImage.Question, MessageBoxResult.No) ==
                    MessageBoxResult.Yes)
                {
                    int result = await DBManagerAsync.DeleteAsync(vm);
                    if (result == 1)
                    {
                        _mappings.Remove(vm);
                    }
                }
            }
        }

        private void AddItem_Click(object sender, RoutedEventArgs e)
        {
            ValueMapping vm = new ValueMapping();
            _mappings.Add(vm);
        }

        private void dataGridValueMappings_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
        {
            // we need to check that there are no keys entered twice or changed into something that is already here
            if(e.Column == columnKey)
            {
                TextBox t = e.EditingElement as TextBox;
                string editedCellValue = t.Text;
                ValueMapping editedMapping = e.Row.Item as ValueMapping;
                editedMapping.IsDirty = true;
                foreach(ValueMapping vm in _mappings)
                {
                    if (vm.Key == editedCellValue)
                        e.Cancel = true; // hopefully this avoids writing back to the model
                }
            }
        }

        private void dataGridValueMappings_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {

        }

        private void buttonImport_Click(object sender, RoutedEventArgs e)
        {

        }

        private void buttonExport_Click(object sender, RoutedEventArgs e)
        {

        }

        private async void comboBoxType_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            this._mappings.Clear();

            if(this.comboBoxType.SelectedItem != null)
            {
                ValueMapping.MappingType mappingType = (ValueMapping.MappingType)this.comboBoxType.SelectedItem;
                List<ValueMapping> mappings = await DBManagerAsync.LoadValuesForType(mappingType);
                foreach (ValueMapping vm in mappings)
                    _mappings.Add(vm);
            }
            
        }

        private void dataGridValueMappings_BeginningEdit(object sender, DataGridBeginningEditEventArgs e)
        {
            this.activeCellAtEdit = this.dataGridValueMappings.CurrentCell;
        }

        private async void buttonSave_Click(object sender, RoutedEventArgs e)
        {
            foreach(ValueMapping vm in _mappings)
            {
                if (vm.Key.IsNullOrEmpty()) continue;
                if (vm.IsNew || vm.IsDirty)
                    await DBManagerAsync.SaveAsync(vm);
            }
        }
    }
}