/*******************************************************************************
 * Copyright (c) 2016, 2017 IBM Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * 	Contributors:
 * 	    IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.jsdt.js.node.internal.propertytesters;

import org.eclipse.core.expressions.PropertyTester;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.wst.jsdt.chromium.debug.core.ChromiumDebugPlugin;
import org.eclipse.wst.jsdt.js.node.internal.NodeConstants;

/**
 * Property tester for Node Launch Shortcut
 *
 * @author "Adalberto Lopez Venegas (adalbert)"
 * @author "Ilya Buziuk (ibuziuk)"
 */
public class NodePropertyTester extends PropertyTester {
	// Properties
	private static final String IS_NODE_INIT = "isNodeInit"; //$NON-NLS-1$

	// File extensions
	private static final String JS_EXT = "js"; //$NON-NLS-1$

	// Invalid parent folder for running Node.js apps
	private static final String BOWER_COMPONENTS_FOLDER = "bower_components"; //$NON-NLS-1$

	@Override
	public boolean test(Object receiver, String property, Object[] args, Object expectedValue) {
		if (IS_NODE_INIT.equals(property) && receiver instanceof IResource) {
			IResource resource = (IResource) receiver;
			if (resource instanceof IProject) {
				return hasPackageJson((IProject) receiver);
			} else if (resource instanceof IFile) {
				return isValidFile((IFile) receiver);
			}
		}
		return false;
	}

	private boolean hasPackageJson(IProject project) {
		IFile packageJsonFile = project.getFile(NodeConstants.PACKAGE_JSON);
		if (packageJsonFile != null && packageJsonFile.isAccessible()) {
			return true;
		}
		return false;
	}

	private boolean isValidFile(IFile file) {
		// File must be a js file
		String fileExtension = file.getFileExtension();
		if (fileExtension == null || !(fileExtension.equals(JS_EXT)
				|| ChromiumDebugPlugin.getSourceMapManager().canSupportSourceMap(fileExtension))) {
			return false;
		}

		// File must exists and be accessible
		if (file.exists() && file.isAccessible()) {
			String filePath = file.getFullPath().toOSString();

			// Js file cannot be inside bower_components
			if (filePath != null && !filePath.contains(BOWER_COMPONENTS_FOLDER)) {
				return true;
			}
		}
		return false;
	}
}