/**
 * 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.ecview.services.vaadin.impl;

import java.util.HashSet;
import java.util.Set;
import java.util.Stack;

import org.eclipse.osbp.ecview.core.common.model.core.YLayout;
import org.eclipse.osbp.dsl.semantic.common.types.LDataType;
import org.osgi.framework.Bundle;
import org.osgi.framework.FrameworkUtil;

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

	/** The Constant NUMERICTYPES. */
	protected static final Set<String> NUMERICTYPES = new HashSet<String>();
	static {
		NUMERICTYPES.add(Byte.class.getName());
		NUMERICTYPES.add(Long.class.getName());
		NUMERICTYPES.add(Short.class.getName());
		NUMERICTYPES.add(Integer.class.getName());

		NUMERICTYPES.add("byte");
		NUMERICTYPES.add("long");
		NUMERICTYPES.add("short");
		NUMERICTYPES.add("int");
	}

	/** The Constant DECIMALTYPES. */
	protected static final Set<String> DECIMALTYPES = new HashSet<String>();
	static {
		DECIMALTYPES.add(Double.class.getName());
		DECIMALTYPES.add(Float.class.getName());

		NUMERICTYPES.add("double");
		NUMERICTYPES.add("float");
	}

	/** The contexts. */
	protected Stack<Context> contexts = new Stack<Context>();
	
	/** The model bundle. */
	protected Bundle modelBundle;

	/**
	 * Inits the.
	 *
	 * @param yLayout
	 *            the y layout
	 * @param clazz
	 *            the clazz
	 */
	public void init(YLayout yLayout, Class<?> clazz) {
		modelBundle = FrameworkUtil.getBundle(clazz);
		contexts.push(new Context(null, null, yLayout));
	}

	/**
	 * Returns the currently active layout.
	 *
	 * @return the layout
	 */
	public YLayout getLayout() {
		return contexts.peek().getLayout();
	}

	/**
	 * Returns the binding path under respect of nested attributes.
	 *
	 * @param attribute
	 *            the attribute
	 * @return the binding path
	 */
	public String getBindingPath(String attribute) {
		return contexts.peek().getBindingPathFor(attribute);
	}

	/**
	 * Checks if is string.
	 *
	 * @param object
	 *            the object
	 * @return true, if is string
	 */
	public static boolean isString(LDataType object) {
		String fqn = object.getJvmTypeReference().getQualifiedName();
		return "java.lang.String".equals(fqn);
	}

	/**
	 * Checks if is boolean.
	 *
	 * @param object
	 *            the object
	 * @return true, if is boolean
	 */
	public static boolean isBoolean(LDataType object) {
		String name = object.getJvmTypeReference().getQualifiedName();
		return "java.lang.Boolean".equals(name);
	}

	/**
	 * Checks if is numeric.
	 *
	 * @param object
	 *            the object
	 * @return true, if is numeric
	 */
	public static boolean isNumeric(LDataType object) {
		String name = object.getJvmTypeReference().getQualifiedName();
		return NUMERICTYPES.contains(name);
	}

	/**
	 * Checks if is decimal.
	 *
	 * @param object
	 *            the object
	 * @return true, if is decimal
	 */
	public static boolean isDecimal(LDataType object) {
		String name = object.getJvmTypeReference().getQualifiedName();
		return DECIMALTYPES.contains(name);
	}

	/**
	 * The Class Context.
	 */
	protected static class Context {
		
		/** The parent. */
		protected final Context parent;
		
		/** The binding attribute. */
		protected final String bindingAttribute;
		
		/** The layout. */
		protected final YLayout layout;

		/**
		 * Instantiates a new context.
		 *
		 * @param parent
		 *            the parent
		 * @param bindingAttribute
		 *            the binding attribute
		 * @param layout
		 *            the layout
		 */
		public Context(Context parent, String bindingAttribute, YLayout layout) {
			super();
			this.parent = parent;
			this.bindingAttribute = bindingAttribute;
			this.layout = layout;
		}

		/**
		 * Gets the layout.
		 *
		 * @return the parentLayout
		 */
		public YLayout getLayout() {
			if (layout != null) {
				return layout;
			}

			if (parent != null) {
				return parent.getLayout();
			}

			throw new IllegalStateException("No layout found");
		}

		/**
		 * Gets the binding path.
		 *
		 * @return the binding path
		 */
		public String getBindingPath() {
			String path = "";
			if (parent != null) {
				path = parent.getBindingPath();
			}

			if (bindingAttribute != null) {
				if (path != null && !path.equals("")) {
					if (!bindingAttribute.equals("")) {
						// attache the binding attribute separated by a "."
						path = path + "." + bindingAttribute;
					}
				} else {
					path = bindingAttribute;
				}
			}

			return path;
		}

		/**
		 * Gets the binding path for.
		 *
		 * @param attribute
		 *            the attribute
		 * @return the binding path for
		 */
		public String getBindingPathFor(String attribute) {
			String path = getBindingPath();
			if (path != null && !path.equals("")) {
				path = path + "." + attribute;
			} else {
				path = attribute;
			}
			return path;
		}

	}
}