package cse1030;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

/**
 * A controller for the image viewer application.
 * 
 * @author CSE1030Z
 *
 */
public class ViewerController implements ActionListener {
  
  /**
   * String for the action command for opening files.
   */
  public static final String OPEN = "OPEN";
  
  /**
   * String for the action command for clearing all of the images.
   */
  public static final String CLEAR = "CLEAR";
  
  /**
   * String for the action command for showing the previous image.
   */
  public static final String PREVIOUS = "PREVIOUS";
  
  /**
   * String for the action command for showing the next image.
   */
  public static final String NEXT = "NEXT";

  private ViewerModel model;
  private ViewerView view;
  
  /**
   * Creates a controller with the given model and view.
   * 
   * @param model a ViewerModel
   * @param view a ViewerView
   */
  public ViewerController(ViewerModel model, ViewerView view) {
    this.model = model;
    this.view = view;
  }

  /**
   * Method that responds to action events emitted from the view controls.
   * 
   * @param event an event to respond to
   * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
   */
  @Override
  public void actionPerformed(ActionEvent event) {
    String action = event.getActionCommand();
    if (action.equals(OPEN)) {
      File[] files = this.view.getFilesToOpen();
      this.model.openImages(files);
      this.view.setImage(this.model.getCurrentImage());
    }
    else if (action.equals(CLEAR)) {
      this.model.clearImages();
      this.view.setImage(this.model.getCurrentImage());
    }
    else if (action.equals(PREVIOUS)) {
      this.view.setImage(this.model.getPreviousImage());
    }
    else if (action.equals(NEXT)) {
      this.view.setImage(this.model.getNextImage());
    }
  }
  
  
}