using bsmd.database;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media.Imaging;

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);

            MenuItem invalidItem = new MenuItem
            {
                Header = "Set as invalid key",
                Icon = new Image { Source = new BitmapImage(new Uri("pack://application:,,,/Resources/sign_warning_radiation.png")) }
            };
            invalidItem.Click += InvalidItem_Click;
            this.dataGridValueMappings.ContextMenu.Items.Add(invalidItem);

        }

        #region context menu event handler

        private void InvalidItem_Click(object sender, RoutedEventArgs e)
        {
            if (this.dataGridValueMappings.SelectedItem is ValueMapping vm)
            {
                vm.Value = "*";
            }
        }

        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.MappingType? mappingType = (ValueMapping.MappingType?) this.comboBoxType.SelectedItem;
            if (mappingType == null) return;
            ValueMapping vm = ValueMapping.Create(mappingType.Value);
            _mappings.Add(vm);
        }

        #endregion

        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
            string newValue = ((TextBox)e.EditingElement).Text;
            if (newValue == null) return;

            if (e.Column == columnKey)
            {
                ValueMapping editedMapping = e.Row.Item as ValueMapping;
                foreach(ValueMapping vm in _mappings)
                {
                    if (vm == editedMapping) continue; // dont compare with myself                    
                    if (vm.Key == newValue)
                    {
                        ((TextBox)e.EditingElement).Text = editedMapping.Key;
                        e.Cancel = true; // hopefully this avoids writing back to the model
                    }
                }
            }
            if(e.Column == columnValue)
            {
                ValueMapping editedMapping = e.Row.Item as ValueMapping;                

                ValueMapping.MappingType? mappingType = (ValueMapping.MappingType)this.comboBoxType.SelectedItem;
                if ((mappingType != null) && (newValue != null))
                {
                    switch (mappingType)
                    {
                        case ValueMapping.MappingType.GENDER:
                            if (Util.GlobalStructures.GenderDict.ContainsKey(newValue))
                                editedMapping.ValueText = Util.GlobalStructures.GenderDict[newValue];
                            else
                                editedMapping.ValueText = "";
                            break;
                        case ValueMapping.MappingType.DOCUMENT_TYPE:
                            if (Util.GlobalStructures.IDDocTypeDict.ContainsKey(newValue))
                                editedMapping.ValueText = Util.GlobalStructures.IDDocTypeDict[newValue];
                            else
                                editedMapping.ValueText = "";
                            break;
                        default:
                            editedMapping.ValueText = newValue;
                            break;
                    }
                }
            }
        }

        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)
                {
                    // add "Klartext"
                    switch(mappingType)
                    {
                        case ValueMapping.MappingType.GENDER:
                            if (Util.GlobalStructures.GenderDict.ContainsKey(vm.Value))
                                vm.ValueText = Util.GlobalStructures.GenderDict[vm.Value];
                            break;
                        case ValueMapping.MappingType.DOCUMENT_TYPE:
                            if (Util.GlobalStructures.IDDocTypeDict.ContainsKey(vm.Value))
                                vm.ValueText = Util.GlobalStructures.IDDocTypeDict[vm.Value];
                            break;
                        default:
                            vm.ValueText = vm.Value;
                            break;
                    }

                    _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)
        {
            int totalSaves = 0;
            foreach(ValueMapping vm in _mappings)
            {
                if (vm.Key.IsNullOrEmpty()) continue;
                if (vm.IsNew || vm.IsDirty)
                {
                    totalSaves += await DBManagerAsync.SaveAsync(vm);
                }
            }
            if(totalSaves > 0)
            {
                MessageBox.Show($"{totalSaves} value mappings saved", "Success", MessageBoxButton.OK, MessageBoxImage.Information);
            }
        }
    }
}