using System;
using InABox.Core;
using InABox.Mobile;


namespace PRS.Mobile
{
    class DigitalFormBoolean : MobileTabStrip, IDigitalFormField<DFLayoutBooleanField, DFLayoutBooleanFieldProperties, bool>
    {
        private DFLayoutBooleanField _definition;
        

        public DFLayoutBooleanField Definition
        {
            get => _definition;
            set
            {
                _definition = value;
                Initialize(value ?? new DFLayoutBooleanField());
            }
        }
        
        public bool Value
        {
            get => SelectedItem?.Index == 0;
            set => SelectedItem = (value ? Items[0] : Items[1]); 
        }

        public bool IsEmpty => false;
        
        public void Deserialize(string serialized) => Value = 
            String.Equals(serialized,Definition.Properties.TrueValue);
        

        public string Serialize() => Value 
            ? Definition.Properties.TrueValue 
            : Definition.Properties.FalseValue;

        private bool _readOnly;
        public bool ReadOnly
        {
            get => _readOnly;
            set
            {
                _readOnly = value;
                UpdateStatus();
            }
        }

        public event DigitalFormViewChangedHandler ValueChanged;
        
        public DigitalFormBoolean()
        {
            HeightRequest = 35;
            Items.Add(new MobileTabStripItem() { Text = "Yes"});
            Items.Add(new MobileTabStripItem() { Text = "No"});
            
            
            SelectionChanged += (sender, args) =>
            {
                Value = SelectedItem.Index == 0;
                ValueChanged?.Invoke(this,new DigitalFormViewChangedArgs(Definition,Value));
            };
        }

        private void Initialize(DFLayoutBooleanField value)
        {
            Items[0].Text = value.Properties.TrueValue;
            Items[1].Text = value.Properties.FalseValue;
            UpdateStatus();
        }

        private void UpdateStatus()
        {
            IsEnabled = !_readOnly || Definition.Properties.Secure;
            
            var unselected = DigitalFormUtils.GetColors(!IsEnabled, Definition.Properties.Required, true);
            BorderColor = unselected.Border;
            UnselectedBackground = unselected.Background;
            UnselectedForeground = unselected.Foreground;
            
            var selected = DigitalFormUtils.GetColors(!IsEnabled, Definition.Properties.Required, false);
            SelectedBackground = selected.Background;
            SelectedForeground = selected.Foreground;
        }
        
        
    }
}