using System;
using InABox.Core;
using InABox.Mobile;
using Xamarin.Forms;

namespace PRS.Mobile
{
    
    public class DigitalFormHeader : MobileCard, IDigitalFormControl<DFLayoutHeader>
    {
        private readonly Image _image;
        private readonly Label _label;
        
        private DFLayoutHeader _definition;
        public DFLayoutHeader Definition
        {
            get => _definition;
            set
            {
                _definition = value;
                Initialize(value ?? new DFLayoutHeader());
            }
        }

        private bool _collapsed;
        public bool Collapsed
        {
            get => _collapsed;
            set
            {
                _collapsed = value;
                _image.Source = value
                    ? ImageSource.FromFile("arrow_white_up")
                    : ImageSource.FromFile("arrow_white_down");
            }
        }

        public event EventHandler CollapsedChanged;
        
        public DigitalFormHeader()
        {
            HeightRequest = 40;
            Padding = 5;
            BorderColor = Color.Gray;
            BackgroundColor = Color.Silver;

            Grid grid = new Grid()
            {
                ColumnSpacing = 0,
                RowSpacing = 0
            };
            grid.ColumnDefinitions.Add(new ColumnDefinition() { Width = GridLength.Auto});
            grid.ColumnDefinitions.Add(new ColumnDefinition() { Width = GridLength.Star});
            grid.ColumnDefinitions.Add(new ColumnDefinition() { Width = GridLength.Auto});
            grid.RowDefinitions.Add(new RowDefinition() { Height = GridLength.Star });

            _image = new Image()
            {
                HeightRequest = 20,
                WidthRequest = 20,
                VerticalOptions = LayoutOptions.Center,
                HorizontalOptions = LayoutOptions.Center
            };
            _image.GestureRecognizers.Add(new TapGestureRecognizer() { Command = new Command(OnTap)});
            grid.Children.Add(_image);

            _label = new Label()
            {
                Margin = new Thickness(5,0,5,0),
                VerticalOptions = LayoutOptions.Fill,
                VerticalTextAlignment = TextAlignment.Center,
                HorizontalOptions = LayoutOptions.Fill,
            };
            _label.GestureRecognizers.Add(new TapGestureRecognizer() { Command = new Command(OnTap)});
            _label.SetValue(Grid.ColumnProperty,1);
            grid.Children.Add(_label);

            Content = grid;
        }

        private void OnTap()
        {
            Collapsed = !Collapsed;
            CollapsedChanged?.Invoke(this, EventArgs.Empty);
        }
        
        private void Initialize(DFLayoutHeader definition)
        {
            Collapsed = definition.Collapsed;
            
            _image.SetValue(Grid.ColumnProperty, definition.Alignment == DFLayoutHeaderAlignment.Left ? 0 : 2);
            
            _image.Source = definition.Collapsed
                ? ImageSource.FromFile("arrow_white_up")
                : ImageSource.FromFile("arrow_white_down");

            _label.Text = definition.Header?.Trim();
            
            _label.LineBreakMode = definition.Style.TextWrapping ? LineBreakMode.WordWrap : LineBreakMode.NoWrap;
            
            _label.BackgroundColor = definition.Style.BackgroundColour.IsEmpty ? Color.Transparent : definition.Style.BackgroundColour;
            
            _label.FontAttributes = definition.Style.IsBold ? FontAttributes.Bold
                : definition.Style.IsItalic ? FontAttributes.Italic
                : FontAttributes.None;
            
            _label.TextDecorations = definition.Style.Underline == UnderlineType.Single || definition.Style.Underline == UnderlineType.Double ?
                TextDecorations.Underline : TextDecorations.None;
            
            _label.FontSize = definition.Style.FontSize > 5 && definition.Style.FontSize < 37 ? definition.Style.FontSize
                : Device.GetNamedSize(NamedSize.Small, _label);
            
            _label.TextColor = definition.Style.ForegroundColour.IsEmpty ? Color.Black : definition.Style.ForegroundColour;

            _label.HorizontalTextAlignment = definition.Style.HorizontalTextAlignment == DFLayoutAlignment.Start
                ? TextAlignment.Start
                : definition.Style.HorizontalTextAlignment == DFLayoutAlignment.Middle
                    ? TextAlignment.Center
                    : TextAlignment.End;
            
            _label.VerticalTextAlignment = definition.Style.VerticalTextAlignment == DFLayoutAlignment.Start 
                ? TextAlignment.Start
                : definition.Style.HorizontalTextAlignment == DFLayoutAlignment.Middle 
                    ? TextAlignment.Center
                    : TextAlignment.End;
        }
        

    }
}