using System.Collections.Generic;
using System.Linq;
using InABox.Core;
using InABox.Mobile;
using Xamarin.Forms;

namespace PRS.Mobile
{
    public class DigitalFormMultiSignature : Grid, IDigitalFormField<DFLayoutMultiSignaturePad, DFLayoutMultiSignaturePadProperties, Dictionary<string, byte[]>, Dictionary<string, byte[]>?> 
    {
        private readonly CollectionView _images;
        private readonly MobileCard _frame;
        private readonly MobileButton _add;
        private readonly MobileButton _select;
        private readonly MobileButton _clear;
        
        private DFLayoutMultiSignaturePad? _definition;
        public DFLayoutMultiSignaturePad? Definition
        {
            get => _definition;
            set
            {
                _definition = value;
                Initialize(value ?? new DFLayoutMultiSignaturePad());
            }
        }
        
        private Dictionary<string, byte[]> _value = new Dictionary<string, byte[]>();
        public Dictionary<string, byte[]> Value
        {
            get => _value;
            set
            {
                _value = value;
                DoUpdateUI();
            }
        }
        
        public bool IsEmpty => Value.Any() != true;

        private void DoUpdateUI()
        {
            _images.ItemsSource = null;
            _images.ItemsSource = _value.ToArray();
        }

        private bool _readOnly;
        public bool ReadOnly
        {
            get => _readOnly;
            set
            {
                _readOnly = value;
                UpdateStatus();
            }
        }
        
        public void Deserialize(DFLoadStorageEntry entry)
        {
            _value = Definition?.Properties.DeserializeValue(entry) ?? new Dictionary<string, byte[]>();
            DoUpdateUI();
        }

        public void Serialize(DFSaveStorageEntry entry)
        {
            Definition?.Properties.SerializeValue(entry,_value);
        }
        
        public event DigitalFormViewChangedHandler? ValueChanged;

        public DigitalFormMultiSignature()
        {
            
            HeightRequest = 200;
            
            ColumnDefinitions.Add(new ColumnDefinition() { Width = GridLength.Star });
            ColumnDefinitions.Add(new ColumnDefinition() { Width = GridLength.Auto });
            
            RowDefinitions.Add(new RowDefinition() { Height = GridLength.Auto });
            RowDefinitions.Add(new RowDefinition() { Height = GridLength.Auto });
            RowDefinitions.Add(new RowDefinition() { Height = GridLength.Star });
            RowDefinitions.Add(new RowDefinition() { Height = GridLength.Auto });

            _images = new CollectionView()
            {
                ItemsLayout = new LinearItemsLayout(ItemsLayoutOrientation.Horizontal) { ItemSpacing = 10 },
                ItemSizingStrategy = ItemSizingStrategy.MeasureAllItems,
                ItemTemplate = new DataTemplate(() =>
                {
                    var image = new Image()
                    {
                        Aspect = Aspect.AspectFit, 
                        VerticalOptions = LayoutOptions.Fill,
                        HorizontalOptions = LayoutOptions.FillAndExpand,
                        WidthRequest = 200,
                        Margin = new Thickness(10),
                    };
                    image.SetBinding(Image.SourceProperty, new Binding("Value",BindingMode.Default,new ByteArrayToImageSourceConverter()));
                    image.SetValue(Grid.RowProperty,0);
                    image.SetValue(Grid.ColumnProperty,0);
                    image.SetValue(Grid.ColumnSpanProperty,2);
                    
                    var label = new Label()
                    {
                        HorizontalOptions = LayoutOptions.Fill,
                        HorizontalTextAlignment = TextAlignment.Center
                    };
                    label.SetBinding(Image.SourceProperty, new Binding("Key"));
                    label.SetValue(Grid.RowProperty,1);
                    label.SetValue(Grid.ColumnProperty,0);
                    
                    var button = new MobileMenuButton()
                    {
                        Image = ImageSource.FromFile("cross")
                    };
                    button.Clicked += (sender, args) =>
                    {
                        /* DoDelete functionality here*/
                    };
                    button.SetValue(Grid.RowProperty,1);
                    button.SetValue(Grid.ColumnProperty,1);

                    var grid = new Grid();
                    grid.RowDefinitions.Add(new RowDefinition() { Height = GridLength.Star });
                    grid.RowDefinitions.Add(new RowDefinition() { Height = GridLength.Auto });
                    grid.ColumnDefinitions.Add(new ColumnDefinition() { Width = GridLength.Star });
                    grid.ColumnDefinitions.Add(new ColumnDefinition() { Width = GridLength.Auto });
                    grid.Children.Add(image);
                    grid.Children.Add(label);
                    grid.Children.Add(button);
                    
                    var frame = new MobileCard()
                    {
                        BorderColor = Color.White,
                        BackgroundColor = Color.White,
                        CornerRadius = 5,
                        Content = grid
                    };
                    
                    return frame;
                }),
            };
            _frame = new MobileCard()
            {
                Content = _images, 
                Padding = 10
            };
            _frame.SetValue(Grid.RowProperty,0);
            _frame.SetValue(Grid.ColumnProperty,0);
            _frame.SetValue(Grid.RowSpanProperty,4);
            Children.Add(_frame);
            
            _add = new MobileButton()
            {
                Image = ImageSource.FromFile("plus"),
                Orientation = StackOrientation.Horizontal,
                WidthRequest = 40,
                HeightRequest = 40,
                CornerRadius = 5
            };
            _add.Clicked += (sender, args) =>
            {
                
            };
            _add.SetValue(Grid.RowProperty,0);
            _add.SetValue(Grid.ColumnProperty,1);
            Children.Add(_add);
            
            _select = new MobileButton()
            {
                Image = ImageSource.FromFile("photolibrary"),
                Orientation = StackOrientation.Horizontal,
                WidthRequest = 40,
                HeightRequest = 40,
                CornerRadius = 5
            };
            _select.Clicked += (sender, args) =>
            {
                
            };
            _select.SetValue(Grid.RowProperty,1);
            _select.SetValue(Grid.ColumnProperty,1);
            Children.Add(_select);
            
            _clear = new MobileButton()
            {
                Image = ImageSource.FromFile("cross"),
                Orientation = StackOrientation.Horizontal,
                WidthRequest = 40,
                HeightRequest = 40,
                CornerRadius = 5
          
            };
            _clear.Clicked +=  (sender, args) =>
            {
                
            };
            _clear.SetValue(Grid.RowProperty,3);
            _clear.SetValue(Grid.ColumnProperty,1);
            Children.Add(_clear);
        }
        
        private void Initialize(DFLayoutMultiSignaturePad value)
        {
            UpdateStatus();
        }
        
        protected bool Secure => Definition?.Properties.Secure ?? false;
        protected bool Required => Definition?.Properties.Required ?? false;
        
        private void UpdateStatus()
        {
            bool enabled = !_readOnly && !Secure;
            _add.IsEnabled = enabled;
            _clear.IsEnabled = enabled;
            
            var colors = DigitalFormUtils.GetColors(!enabled, Required, false);
            _frame.BackgroundColor = colors.Background;
            _frame.BorderColor = colors.Border;
            
            colors = DigitalFormUtils.GetColors(!enabled, Required, true);
            _add.BackgroundColor = colors.Background;
            _add.BorderColor = colors.Border;
            
            _clear.BackgroundColor = colors.Background;
            _clear.BorderColor = colors.Border;
        }
    }
}