/**
 * Copyright (c) 2011, 2015 - Lunifera GmbH (Gross Enzersdorf, Austria), Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0 
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *         Florian Pirchner - Initial implementation
 */
package org.eclipse.osbp.runtime.web.vaadin.components.dialogs;

import org.eclipse.osbp.runtime.web.vaadin.common.resource.IResourceProvider;

import com.vaadin.server.Resource;
import com.vaadin.ui.AbstractComponentContainer;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.NativeButton;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.Window;
import com.vaadin.ui.Window.CloseEvent;

// TODO: Auto-generated Javadoc
/**
 * The Class AbstractDialog.
 */
public abstract class AbstractDialog {

	/** The config. */
	protected final DialogConfig config;
	
	/** The options. */
	protected final Option[] options;

	/** The window. */
	protected Window window;
	
	/** The main layout. */
	protected VerticalLayout mainLayout;
	
	/** The custom area. */
	protected AbstractComponentContainer customArea;
	
	/** The options area. */
	protected HorizontalLayout optionsArea;

	/**
	 * Create resource for the given iconPath.
	 *
	 * @param iconPath
	 *            the icon path
	 * @param resourceProvider
	 *            the resource provider
	 * @return the resource
	 */
	protected static Resource createResource(String iconPath,
			IResourceProvider resourceProvider) {
		if (resourceProvider == null) {
			return null;
		}
		return resourceProvider.getResource(iconPath);
	}

	/**
	 * Instantiates a new abstract dialog.
	 *
	 * @param config
	 *            the config
	 * @param options
	 *            the options
	 */
	protected AbstractDialog(DialogConfig config, Option... options) {
		this.config = config;
		this.options = options;
	}

	/**
	 * Open.
	 */
	@SuppressWarnings("serial")
	protected void open() {

		prepareLayout();

		configDialog();

		prepareOptions();

		window.addCloseListener(new Window.CloseListener() {
			@Override
			public void windowClose(CloseEvent e) {
				close();
			}
		});

		UI.getCurrent().addWindow(window);
	}

	/**
	 * Prepare the options.
	 */
	protected void prepareOptions() {
		if (options != null) {
			@SuppressWarnings("serial")
			Button.ClickListener listener = new Button.ClickListener() {
				@Override
				public void buttonClick(ClickEvent event) {
					Button button = event.getButton();
					execute((Option) button.getData());
				}
			};

			for (Option option : options) {
				NativeButton button = new NativeButton(option.getName());
				optionsArea.addComponent(button);
				button.setIcon(option.getIcon());
				button.setDescription(option.getDescription());
				button.setData(option);
				button.addClickListener(listener);
			}
		}
	}

	/**
	 * Config the dialog.
	 */
	protected void configDialog() {

		if (config != null) {
			window.setCaption(config.getDialogName());
			window.setDescription(config.getDescription());

			// use callback
			config.config(window);
		}

	}

	/**
	 * Prepare the main layout.
	 */
	protected abstract void prepareLayout();

	/**
	 * Close the window.
	 */
	protected void close() {
		if (window != null) {
			window.close();
			window = null;
		}
	}

	/**
	 * Execute the runnable.
	 *
	 * @param option
	 *            the option
	 */
	protected void execute(Option option) {
		if (option.canExecute()) {
			if (option.getRunnable() != null) {
				option.getRunnable().run();
			}
			close();
		}
	}

	/**
	 * Information how to config the dialog. Clients may override
	 * {@link #config(Window)} to get access about the window before opening. So
	 * clients may set size, position,...
	 */
	public static class DialogConfig {

		/** The dialog name. */
		private final String dialogName;
		
		/** The message. */
		private final String message;
		
		/** The description. */
		private final String description;
		
		/** The icon. */
		private final Resource icon;

		/**
		 * Instantiates a new dialog config.
		 *
		 * @param dialogName
		 *            the dialog name
		 * @param message
		 *            the message
		 * @param description
		 *            the description
		 * @param icon
		 *            the icon
		 */
		public DialogConfig(String dialogName, String message,
				String description, Resource icon) {
			super();
			this.dialogName = dialogName;
			this.message = message;
			this.description = description;
			this.icon = icon;
		}

		/**
		 * Clients may override to config the window before opening.
		 *
		 * @param window
		 *            the window
		 */
		public void config(Window window) {

		}

		/**
		 * Gets the dialog name.
		 *
		 * @return the dialogName
		 */
		protected String getDialogName() {
			return dialogName;
		}

		/**
		 * Gets the message.
		 *
		 * @return the message
		 */
		protected String getMessage() {
			return message;
		}

		/**
		 * Gets the description.
		 *
		 * @return the description
		 */
		protected String getDescription() {
			return description;
		}

		/**
		 * Gets the icon.
		 *
		 * @return the icon
		 */
		protected Resource getIcon() {
			return icon;
		}

	}

	/**
	 * Represents a single option.
	 */
	public static class Option {

		/** The name. */
		private String name;
		
		/** The description. */
		private String description;
		
		/** The icon. */
		private Resource icon;
		
		/** The runnable. */
		private Runnable runnable;

		/**
		 * Instantiates a new option.
		 *
		 * @param name
		 *            the name
		 * @param description
		 *            the description
		 * @param icon
		 *            the icon
		 * @param runnable
		 *            the runnable
		 */
		public Option(String name, String description, Resource icon,
				Runnable runnable) {
			super();
			this.name = name;
			this.description = description;
			this.icon = icon;
			this.runnable = runnable;
		}

		/**
		 * Gets the name.
		 *
		 * @return the name
		 */
		protected String getName() {
			return name;
		}

		/**
		 * Sets the name.
		 *
		 * @param name
		 *            the name to set
		 */
		protected void setName(String name) {
			this.name = name;
		}

		/**
		 * Gets the description.
		 *
		 * @return the description
		 */
		protected String getDescription() {
			return description;
		}

		/**
		 * Sets the description.
		 *
		 * @param description
		 *            the description to set
		 */
		protected void setDescription(String description) {
			this.description = description;
		}

		/**
		 * Gets the icon.
		 *
		 * @return the icon
		 */
		protected Resource getIcon() {
			return icon;
		}

		/**
		 * Sets the icon.
		 *
		 * @param icon
		 *            the icon to set
		 */
		protected void setIcon(Resource icon) {
			this.icon = icon;
		}

		/**
		 * Gets the runnable.
		 *
		 * @return the runnable
		 */
		protected Runnable getRunnable() {
			return runnable;
		}

		/**
		 * Sets the runnable.
		 *
		 * @param runnable
		 *            the runnable to set
		 */
		protected void setRunnable(Runnable runnable) {
			this.runnable = runnable;
		}

		/**
		 * Can execute.
		 *
		 * @return true, if successful
		 */
		public boolean canExecute() {
			return true;
		}

	}

}