/*******************************************************************************
 * Copyright (c) 2003, 2018 IBM Corporation and others.
 * 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:
 *     IBM Corporation - Initial API and implementation
 *******************************************************************************/
package org.eclipse.jst.server.tomcat.core.internal;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.jdt.core.IClasspathAttribute;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jst.server.core.RuntimeClasspathProviderDelegate;
import org.eclipse.wst.common.project.facet.core.IFacetedProject;
import org.eclipse.wst.common.project.facet.core.IProjectFacet;
import org.eclipse.wst.common.project.facet.core.ProjectFacetsManager;
import org.eclipse.wst.server.core.IRuntime;
/**
 * Classpath provider for the Tomcat runtime.
 */
public class TomcatRuntimeClasspathProvider extends RuntimeClasspathProviderDelegate {
	private static final String JST_WEB_FACET_ID = "jst.web";

	private final String getEEJavadocLocation(IProject project) {
		int eeVersion = 8;
		try {
			IFacetedProject faceted = ProjectFacetsManager.create(project);
			if (faceted != null && ProjectFacetsManager.isProjectFacetDefined(JST_WEB_FACET_ID)) {
				IProjectFacet webModuleFacet = ProjectFacetsManager.getProjectFacet(JST_WEB_FACET_ID);
				if (faceted.hasProjectFacet(webModuleFacet)) {
					String servletVersionStr = faceted.getInstalledVersion(webModuleFacet).getVersionString();
					if (servletVersionStr.equals("4.0")) {
						eeVersion = 8;
					} else if (servletVersionStr.equals("3.1")) {
						eeVersion = 7;
					} else if (servletVersionStr.equals("3.0")) {
						eeVersion = 6;
					} else if (servletVersionStr.equals("2.5")) {
						eeVersion = 5;
					} else if (servletVersionStr.equals("2.4")) {
						eeVersion = 4;
					} else if (servletVersionStr.equals("2.3")) {
						eeVersion = 3;
					}
				}
			}
		}
		catch (NumberFormatException e) {
			// default to the latest
		}
		catch (CoreException e) {
			// default to the latest
		}

		String url = "https://javaee.github.io/javaee-spec/javadocs/";
		switch (eeVersion) {
		case 3:
			url = "https://docs.oracle.com/javaee/3/api/";
			break;
		case 4:
			url = "https://docs.oracle.com/javaee/4/api/";
			break;
		case 5:
			url = "https://docs.oracle.com/javaee/5/api/";
			break;
		case 6:
			url = "https://docs.oracle.com/javaee/6/api/";
			break;
		case 7:
			url = "https://docs.oracle.com/javaee/7/api/";
			break;
		case 8:
			url = "https://javaee.github.io/javaee-spec/javadocs/";
			break;
		default:
			url = "https://javaee.github.io/javaee-spec/javadocs/";
			break;
		}

		return url;
	}

	private String getTomcatJavadocLocation(IRuntime runtime) {
		/* Default to v9.0 doc. v7.0 is currently the oldest advertised version on the front page */
		String tomcatDocURL = "https://tomcat.apache.org/tomcat-9.0-doc/api/";
		String runtimeTypeId = runtime.getRuntimeType().getId();
		if (runtimeTypeId.indexOf("85") > 0) {
			tomcatDocURL = "https://tomcat.apache.org/tomcat-8.5-doc/api/";
		}
		else if (runtimeTypeId.indexOf("80") > 0) {
			tomcatDocURL = "https://tomcat.apache.org/tomcat-8.0-doc/api/";
		}
		else if (runtimeTypeId.indexOf("70") > 0) {
			tomcatDocURL = "https://tomcat.apache.org/tomcat-7.0-doc/api/";
		}
		return tomcatDocURL;
	}

	/**
	 * @see RuntimeClasspathProviderDelegate#resolveClasspathContainer(IProject, IRuntime)
	 */
	public IClasspathEntry[] resolveClasspathContainer(IProject project, IRuntime runtime) {
		IPath installPath = runtime.getLocation();
		if (installPath == null)
			return new IClasspathEntry[0];
		
		List<IClasspathEntry> list = new ArrayList<IClasspathEntry>();
		String runtimeId = runtime.getRuntimeType().getId();
		if (runtimeId.indexOf("32") > 0) {
			IPath path = installPath.append("lib");
			addLibraryEntries(list, path.toFile(), true);
		} else if (runtimeId.indexOf("60") > 0 || runtimeId.indexOf("70") > 0 || runtimeId.indexOf("80") > 0 || runtimeId.indexOf("85") > 0 || runtimeId.indexOf("90") > 0) {
			// TODO May need some flexibility in case the installation has been configured differently
			// This lib "simplification" may cause issues for some.
			// Not known yet whether packaged Linux installs will go along.
			IPath path = installPath.append("lib");
			addLibraryEntries(list, path.toFile(), true);
		} else {
			IPath path = installPath.append("common");
			addLibraryEntries(list, path.append("lib").toFile(), true);
			addLibraryEntries(list, path.append("endorsed").toFile(), true);
		}

		IClasspathEntry[] entries = list.toArray(new IClasspathEntry[list.size()]);
		String apiJavadocLocation = getEEJavadocLocation(project);
		String tomcatDocLocation = getTomcatJavadocLocation(runtime);
		for (int i = 0; i < entries.length; i++) {
			IClasspathEntry entry = entries[i];
			String jarName = entry.getPath().lastSegment();
			if (jarName.endsWith("-api.jar") && !jarName.startsWith("tomcat")) {
				// these are assumed to be the API jars for the runtime standards
				IClasspathEntry apiLibraryEntry = JavaCore.newLibraryEntry(entry.getPath(), entry.getSourceAttachmentPath(), entry.getSourceAttachmentRootPath(), entry.getAccessRules(), new IClasspathAttribute[]{JavaCore.newClasspathAttribute(IClasspathAttribute.JAVADOC_LOCATION_ATTRIBUTE_NAME, apiJavadocLocation)}, entry.isExported());
				entries[i] = apiLibraryEntry;
			}
			else {
				IClasspathEntry tomcatLibraryEntry = JavaCore.newLibraryEntry(entry.getPath(), entry.getSourceAttachmentPath(), entry.getSourceAttachmentRootPath(), entry.getAccessRules(), new IClasspathAttribute[]{JavaCore.newClasspathAttribute(IClasspathAttribute.JAVADOC_LOCATION_ATTRIBUTE_NAME, tomcatDocLocation)}, entry.isExported());
				entries[i] = tomcatLibraryEntry;
			}
		}
		return entries;
	}
}