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

namespace PRS.Mobile
{
    public class DigitalFormOptionComboBox : Grid, IDigitalFormField<DFLayoutOptionField, DFLayoutOptionFieldProperties, string>
    {

        private readonly MobileCard _labelframe;
        private readonly Label _label;
        private readonly MobileCard _menuframe;
        private readonly MobileMenuButton _menu;
        
        private DFLayoutOptionField _definition;
        public DFLayoutOptionField Definition
        {
            get => _definition;
            set
            {
                _definition = value;
                Initialize(value ??  new DFLayoutOptionField());
            } 
        }

        private String _value;
        public String Value
        {
            get => _value;
            set
            {
                _value = value;
                _label.Text = String.IsNullOrWhiteSpace(value) ? "Select Value" : value;
            }
        }

        public bool IsEmpty => String.IsNullOrWhiteSpace(Value);

        private bool _readOnly;
        public bool ReadOnly
        {
            get => _readOnly;
            set
            {
                _readOnly = value;
                UpdateStatus();
            }
        }
        
        public void Deserialize(string serialized)
        {
            Value = serialized;
        }

        public string Serialize() => Value;

        public event DigitalFormViewChangedHandler ValueChanged;

        public DigitalFormOptionComboBox()
        {
            HeightRequest = 40;
            
            ColumnDefinitions.Add(new ColumnDefinition() { Width = GridLength.Star });
            ColumnDefinitions.Add(new ColumnDefinition() { Width = GridLength.Auto });
            
            RowDefinitions.Add(new RowDefinition() { Height = GridLength.Star });

            _labelframe = new MobileCard()
            {
                Padding = 5
            };
            Children.Add(_labelframe);
            
            _label = new Label
            {
                Text = "Select Value",
                VerticalTextAlignment = TextAlignment.Center,
                FontSize = Device.GetNamedSize(NamedSize.Small,new Label()),
                Margin = 5
            };
            _labelframe.Content = _label;

            _menuframe = new MobileCard() { Padding = 0 };
            _menuframe.SetValue(Grid.ColumnProperty,1);
            Children.Add(_menuframe);

            _menu = new MobileMenuButton
            {
                WidthRequest = 35,
                Image = ImageSource.FromFile("lines")
            };
            _menuframe.Content = _menu;
        }

        private void Initialize(DFLayoutOptionField definition)
        {
            _menu.Items.Clear();
            foreach (var option in definition.Properties.Options.Replace(",","\n").Split('\n'))
            {
                var item = new  MobileMenuItem() { Text = option.Trim() };
                item.Clicked += (sender, args) =>
                {
                    Value = item.Text;
                    ValueChanged?.Invoke(this, new DigitalFormViewChangedArgs(Definition,Value));
                };
                _menu.Items.Add(item);
            }
            
            if (_menu.Items.Any())
                _menu.Items.Add(new MobileMenuSeparator());
                
            var clear = new  MobileMenuItem() { Text = "Clear Value" };
            clear.Clicked += (sender, args) =>
            {
                Value = "";
                ValueChanged?.Invoke(this, new DigitalFormViewChangedArgs(Definition,Value));
            };
            _menu.Items.Add(clear);

            UpdateStatus();
        }

        private void UpdateStatus()
        {
            IsEnabled = !_readOnly || Definition.Properties.Secure;
            
            var labelcolors = DigitalFormUtils.GetColors(!IsEnabled, Definition.Properties.Required, false);
            _labelframe.BackgroundColor = labelcolors.Background;
            _labelframe.BorderColor = labelcolors.Border;
            _label.TextColor = labelcolors.Foreground;
            
            var menucolors = DigitalFormUtils.GetColors(!IsEnabled, Definition.Properties.Required, true);
            _menuframe.BackgroundColor = menucolors.Background;
            _menuframe.BorderColor = menucolors.Border;
            
        }
    
    }
}