using System;
using System.Drawing;
using System.Timers;
using System.Windows.Forms;

namespace App
{
	class MainWindow : Window
	{
		private readonly ClockLabel ClockLabel = new();

		private readonly Label ColorLabel = new();

		private readonly FlowLayoutPanel Panel= new();

		public MainWindow(Rectangle rect) : base(rect)
		{
			InitializeComponent();
		}

		private void InitializeComponent()
		{
			// ClockLabel
			ClockLabel.Font = new Font("Microsoft Sans Serif", 100F, FontStyle.Regular, GraphicsUnit.Pixel, ((byte)(0)));
			ClockLabel.Size = new Size(450, 120);
			ClockLabel.TextAlign = ContentAlignment.MiddleCenter;
			Panel.Controls.Add(ClockLabel);

			// ColorLabel
			ColorLabel.Size = new Size(ClockLabel.Size.Width, 50);
			ColorLabel.Font = new Font("Microsoft Sans Serif", 18F, FontStyle.Regular, GraphicsUnit.Pixel, ((byte)(0)));
			ColorLabel.TextAlign = ContentAlignment.MiddleCenter;
			Panel.Controls.Add(ColorLabel);


			// Panel
			Panel.FlowDirection = FlowDirection.TopDown;
			Panel.AutoSizeMode = AutoSizeMode.GrowAndShrink;
			Panel.AutoSize = true;
			Controls.Add(Panel);

			// Events
			BackColorChanged += MainWindow_BackColorChanged;
			SizeChanged += MainWindow_SizeChanged;

			// Trigger an size changed event.
			OnSizeChanged(new EventArgs());

		}

		private void MainWindow_SizeChanged(object? sender, EventArgs e)
		{
			// Center panel
			Panel.Left = (Bounds.Width - Panel.ClientRectangle.Width) / 2;
			Panel.Top = (Bounds.Height - Panel.ClientRectangle.Height) / 3;
		}

		private void MainWindow_BackColorChanged(object? sender, EventArgs e)
		{
			// Update Foreground color to contrast the background color.
			if (ColorUtil.GetLuminance(BackColor) < 0.5f) {
				ForeColor = Color.White;
			} else {
				ForeColor = Color.Black;
			}

			ColorLabel.Text = ColorUtil.ToHex(BackColor);
		}
	}
}