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

namespace PRS.Mobile
{
    public class DigitalFormDateEntry : MobileDateButton, IDigitalFormField<DFLayoutDateField, DFLayoutDateFieldProperties, DateTime>
    {
        private DFLayoutDateField _definition;
        public DFLayoutDateField Definition
        {
            get => _definition;
            set
            {
                _definition = value;
                Initialize(value ??  new DFLayoutDateField());
            } 
        }
        
        public DateTime Value
        {
            get => Date;
            set => Date = value;
        }

        public bool IsEmpty => Value.IsEmpty();
        
        public void Deserialize(string serialized)
        {
            if (DateTime.TryParseExact(serialized, "dd-MM-yyyy", CultureInfo.InvariantCulture, DateTimeStyles.None,
                    out DateTime d))
                Value = d;
        }

        public string Serialize() => 
            Value.ToString("dd-MM-yyyy");

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

        public event DigitalFormViewChangedHandler ValueChanged;

        public DigitalFormDateEntry()
        {
            HeightRequest = 40;
            Changed += (sender, args) =>
            {
                ValueChanged?.Invoke(this,new DigitalFormViewChangedArgs(Definition,Value));
            };
        }

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

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