using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace UnwindSoftwareLtd.WPF.StandardControls
{
    public class TextBoxWaterMark : TextBox
    {
        private string waterMarkText = "Please enter username";

        /// <summary>
        /// Text to be displayed as a water mark. (Default is Please enter username)
        /// </summary>
        public string WaterMarkText
        {
            get { return waterMarkText; }
            set { waterMarkText = value; }
        }

        private Brush waterMarkBackground = new SolidColorBrush(Colors.Beige);

        /// <summary>
        /// Water Mark background color (Default is Brushes.Beige)
        /// </summary>
        public Brush WaterMarkBackground
        {
            get { return waterMarkBackground; }
            set { waterMarkBackground = value; }
        }

        private Brush waterMarkForeground = new SolidColorBrush(Colors.Gray);

        /// <summary>
        /// Water Mark text Foreground (Default is Brushes.Gray)
        /// </summary>
        public Brush WaterMarkForeground
        {
            get { return waterMarkForeground; }
            set { waterMarkForeground = value; }
        }


        private Brush standardInputBackground = Brushes.White;

        /// <summary>
        /// Standard input background (Default is Brushes.White)
        /// </summary>
        public Brush StandardInputBackground
        {
            get { return standardInputBackground; }
            set { standardInputBackground = value; }
        }

        private Brush standardInputForeground = Brushes.Black;

        /// <summary>
        /// Standard Input Foreground (Default is Brushes.Black)
        /// </summary>
        public Brush StandardInputForeground
        {
            get { return standardInputForeground; }
            set { standardInputForeground = value; }
        } 


        /// <summary>
        /// Textbox with a watermark background.
        /// </summary>
        public TextBoxWaterMark()
        {
            WaterMark();
        }

        /// <summary>
        /// Check if watermark is displayed and swap over to standard background. 
        /// </summary>
        /// <param name="e"></param>
        protected override void OnGotFocus(RoutedEventArgs e)
        {

            if (this.Text == waterMarkText)
            {
                this.Text = "";
                StandardBackground();
            }
            
            
            base.OnGotFocus(e);
        }

        /// <summary>
        /// Check if watermark should be displayed if so setup. 
        /// </summary>
        /// <param name="e"></param>
        protected override void OnLostFocus(RoutedEventArgs e)
        {
            this.Text = this.Text.Trim(); 
            if (this.Text.Length == 0)
            {
                WaterMark();
            }
            
            base.OnLostFocus(e);
        }
        
        /// <summary>
        /// Sets standard background on the control. 
        /// </summary>
        private void StandardBackground()
        {
            this.Background = standardInputBackground;
            this.Foreground = standardInputForeground; 
        }

        /// <summary>
        /// Sets up a watermark on the textbox. 
        /// </summary>
        private void WaterMark()
        {
            this.Background = waterMarkBackground;
            this.Foreground = waterMarkForeground;
            this.Text = waterMarkText;
        }
    }
}