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

namespace PRS.Mobile
{
    public class DigitalFormIntegerEntry : MobileCard, IDigitalFormField<DFLayoutIntegerField, DFLayoutIntegerFieldProperties, int>
    {

        private readonly MobileEntry _entry;
        
        private DFLayoutIntegerField _definition;
        public DFLayoutIntegerField Definition
        {
            get => _definition;
            set
            {
                _definition = value;
                Initialize(value ??  new DFLayoutIntegerField());
            } 
        }
        
        private int _value;
        public int Value
        {
            get => _value;
            set
            {
                _value = value;
                UpdateUI();
            }
        }

        private void UpdateUI()
        {
            _entry.Text = _value.ToString();
        }

        public bool IsEmpty => Value.Equals(0);

        private bool _readOnly;
        public bool ReadOnly
        {
            get => _readOnly;
            set
            {
                _readOnly = value;
                UpdateStatus();
            }
        }
        
        public void Deserialize(string serialized)
        {
            
            if (int.TryParse(serialized, out int d))
                Value = d;
        }

        public string Serialize() 
            => Value.ToString(CultureInfo.InvariantCulture);

        public event DigitalFormViewChangedHandler ValueChanged;

        public DigitalFormIntegerEntry()
        {
            MinimumHeightRequest = 45;
            Padding = 5;
            
            _entry = new MobileEntry()
            {
                Placeholder = "Enter value",
                BackgroundColor = Color.Transparent,
                Keyboard = Keyboard.Numeric
            };
            _entry.TextChanged += (o,e) =>
            {
                if (!string.IsNullOrWhiteSpace(e.NewTextValue))
                {
                    if (int.TryParse(e.NewTextValue, out int i))
                    {
                        _value = i;
                        ValueChanged?.Invoke(this, new DigitalFormViewChangedArgs(Definition,Value));
                    }
                    else
                        _entry.Text = e.OldTextValue;
                }

            };
            Content = _entry;
        }

        private void Initialize(DFLayoutIntegerField definition)
        {
            UpdateStatus();
        }

        private void UpdateStatus()
        {
            IsEnabled = !_readOnly || Definition.Properties.Secure;
            var colors = DigitalFormUtils.GetColors(!IsEnabled, Definition.Properties.Required, false);
            BackgroundColor = colors.Background;
            BorderColor = colors.Border;
            _entry.TextColor = colors.Foreground;
        }
    
    }
}