using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using System;
using System.Collections.Generic;
using Tutorial012.Controls;

namespace Tutorial012
{
  /// <summary>
  /// This is the main type for your game.
  /// </summary>
  public class Game1 : Game
  {
    GraphicsDeviceManager graphics;
    SpriteBatch spriteBatch;

    private Color _backgroundColour = Color.CornflowerBlue;

    private List<Component> _gameComponents;

    public Game1()
    {
      graphics = new GraphicsDeviceManager(this);
      Content.RootDirectory = "Content";
    }

    /// <summary>
    /// Allows the game to perform any initialization it needs to before starting to run.
    /// This is where it can query for any required services and load any non-graphic
    /// related content.  Calling base.Initialize will enumerate through any components
    /// and initialize them as well.
    /// </summary>
    protected override void Initialize()
    {
      IsMouseVisible = true;

      base.Initialize();
    }

    /// <summary>
    /// LoadContent will be called once per game and is the place to load
    /// all of your content.
    /// </summary>
    protected override void LoadContent()
    {
      // Create a new SpriteBatch, which can be used to draw textures.
      spriteBatch = new SpriteBatch(GraphicsDevice);

      var randomButton = new Button(Content.Load<Texture2D>("Controls/Button"), Content.Load<SpriteFont>("Fonts/Font"))
      {
        Position = new Vector2(350, 200),
        Text = "Random",
      };

      randomButton.Click += RandomButton_Click;

      var quitButton = new Button(Content.Load<Texture2D>("Controls/Button"), Content.Load<SpriteFont>("Fonts/Font"))
      {
        Position = new Vector2(350, 250),
        Text = "Quit",
      };

      quitButton.Click += QuitButton_Click;

      _gameComponents = new List<Component>()
      {
        randomButton,
        quitButton,
      };
    }

    private void QuitButton_Click(object sender, System.EventArgs e)
    {
      Exit();
    }

    private void RandomButton_Click(object sender, System.EventArgs e)
    {
      var random = new Random();

      _backgroundColour = new Color(random.Next(0, 255), random.Next(0, 255), random.Next(0, 255));
    }

    /// <summary>
    /// UnloadContent will be called once per game and is the place to unload
    /// game-specific content.
    /// </summary>
    protected override void UnloadContent()
    {
      // TODO: Unload any non ContentManager content here
    }

    /// <summary>
    /// Allows the game to run logic such as updating the world,
    /// checking for collisions, gathering input, and playing audio.
    /// </summary>
    /// <param name="gameTime">Provides a snapshot of timing values.</param>
    protected override void Update(GameTime gameTime)
    {
      foreach (var component in _gameComponents)
        component.Update(gameTime);

      base.Update(gameTime);
    }

    /// <summary>
    /// This is called when the game should draw itself.
    /// </summary>
    /// <param name="gameTime">Provides a snapshot of timing values.</param>
    protected override void Draw(GameTime gameTime)
    {
      GraphicsDevice.Clear(_backgroundColour);

      spriteBatch.Begin();

      foreach (var component in _gameComponents)
        component.Draw(gameTime, spriteBatch);

      spriteBatch.End();

      base.Draw(gameTime);
    }
  }
}