using System;
using System.Drawing;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;

namespace DTPicker
{
    /// Why I made this fork =>
    /// 1. I wanted to create a simple control with no external dependencies (which means not using WPFToolkit)
    /// 2. I wanted to add time selection controls instead of using the adorners
    /// 3. The textbox also allowed users to type whatever they wanted and then there were checks put in place
    /// to track and correct them or to ask users to make corrections. Too complex in my view for a simple task
    ///
    /// Changes Made =>
    /// 1. Uses the WPF calendar control instead of the WPFToolkit calendar
    /// 2. Uses dropdowns for selecting time and has a save button to update the textbox
    ///
    /// Things that will be needed for this control to work properly (and look good :) ) =>
    /// 1. A bitmap image 32x32 added as an embedded resource
    ///
    /// Licensing =>
    /// The Code Project Open License (CPOL)
    /// http://www.codeproject.com/info/cpol10.aspx
	
    public partial class DateTimePicker : UserControl
    {

        public DateTimePicker()
        {
            InitializeComponent();
            CalDisplay.SelectedDatesChanged += CalDisplay_SelectedDatesChanged;

            BitmapSource ConvertGDI_To_WPF(Bitmap bm)
            {
                BitmapSource bms = null;
                IntPtr h_bm = IntPtr.Zero;
                h_bm = bm.GetHbitmap();
                bms = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(h_bm, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
                bms.Freeze();
                h_bm = IntPtr.Zero;
                return bms;
            }
            Bitmap bitmap1 = Properties.Resources.datetime;
            bitmap1.MakeTransparent(Color.Black);
            CalIco.Source = ConvertGDI_To_WPF(bitmap1);
        }

		#region "EventHandlers"

		private void CalDisplay_SelectedDatesChanged(object sender, EventArgs e)
		{
			PopUpCalendarButton.IsChecked = true;
            if (Hours.SelectedIndex == -1 || Min.SelectedIndex == -1 || AMPM.SelectedIndex == -1)
            {
                var date = CalDisplay.SelectedDate.Value.Date + DateTime.Now.TimeOfDay;
                DateDisplay.Text = date.ToString("dd-MM-yyyy hh:mm tt");
                return;
            }
            if (AMPM.Text == "PM")
            {
                int hours = Convert.ToInt32(Hours.Text)+12;
                TimeSpan timeSpan = TimeSpan.Parse(hours.ToString() + ":" + Min.Text);
                if (CalDisplay.SelectedDate.Value.Date == DateTime.Today.Date && timeSpan.CompareTo(DateTime.Now.TimeOfDay)<0)
                {
                    var date = CalDisplay.SelectedDate.Value.Date + DateTime.Now.TimeOfDay;
                    DateDisplay.Text = date.ToString("dd-MM-yyyy hh:mm tt");
                }
                else
                {
                    var date = CalDisplay.SelectedDate.Value.Date + timeSpan;
                    DateDisplay.Text = date.ToString("dd-MM-yyyy hh:mm tt");
                }
            }
            else
            {
                TimeSpan timeSpan = TimeSpan.Parse(Hours.Text + ":" + Min.Text);
                if (CalDisplay.SelectedDate.Value.Date == DateTime.Today.Date && timeSpan.CompareTo(DateTime.Now.TimeOfDay) < 0)
                {
                    var date = CalDisplay.SelectedDate.Value.Date + DateTime.Now.TimeOfDay;
                    DateDisplay.Text = date.ToString("dd-MM-yyyy hh:mm tt");
                }
                else
                {
                    var date = CalDisplay.SelectedDate.Value.Date + timeSpan;
                    DateDisplay.Text = date.ToString("dd-MM-yyyy hh:mm tt");
                }
            }
        }

        private void SaveTime_Click(object sender, RoutedEventArgs e)
        {
            if (CalDisplay.SelectedDate.Value.Date == null)
            {
                CalDisplay.SelectedDate = DateTime.Today.Date;
                CalDisplay.DisplayDate = DateTime.Today.Date;
            }
            if (Hours.SelectedIndex == -1 || Min.SelectedIndex == -1 || AMPM.SelectedIndex == -1) {}
            else
            {
                CalDisplay_SelectedDatesChanged(SaveTime, EventArgs.Empty);
            }
            PopUpCalendarButton.IsChecked = false;
        }

        #endregion

    }

}