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

namespace PRS.Mobile
{
    public class DigitalFormDoubleEntry : MobileCard, IDigitalFormField<DFLayoutDoubleField, DFLayoutDoubleFieldProperties, double, double?>
    {

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

        private void UpdateUI()
        {
            _entry.Text = Definition?.Properties.FormatValue(_value);
        }

        public bool IsEmpty => Math.Abs(Value).Equals(0F);
        
        public void Deserialize(DFLoadStorageEntry entry) 
            => Value = Definition?.Properties.DeserializeValue(entry) ?? 0.0;
        
        public void Serialize(DFSaveStorageEntry entry) 
            => entry.SetValue(Value);
        
        private bool _readOnly;
        public bool ReadOnly
        {
            get => _readOnly;
            set
            {
                _readOnly = value;
                UpdateStatus();
            }
        }

        public event DigitalFormViewChangedHandler? ValueChanged;

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

            };
            Content = _entry;
        }

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

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