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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.tomcat.util.descriptor;

import java.net.URL;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import jakarta.servlet.ServletContext;

import org.apache.jasper.JasperLogger;

/**
 * Wrapper class around the Digester that hide Digester's initialization
 * details.
 */
public class DigesterFactory {


    private static final Class CLASS_SERVLET_CONTEXT;
    private static final Class CLASS_JSP_CONTEXT;

    static {
        CLASS_SERVLET_CONTEXT = ServletContext.class;
        Class jspContext = null;
        try {
            jspContext = Class.forName("jakarta.servlet.jsp.JspContext");
        } catch (ClassNotFoundException e) {
            // Ignore - JSP API is not present.
        }
        CLASS_JSP_CONTEXT = jspContext;
    }


    /**
     * Mapping of well-known public IDs used by the Servlet API to the matching
     * local resource.
     */
    public static final Map SERVLET_API_PUBLIC_IDS;

    /**
     * Mapping of well-known system IDs used by the Servlet API to the matching
     * local resource.
     */
    public static final Map SERVLET_API_SYSTEM_IDS;

    static {
        Map publicIds = new HashMap<>();
        Map systemIds = new HashMap<>();

        // W3C
        add(publicIds, XmlIdentifiers.XSD_10_PUBLIC, locationFor("XMLSchema.dtd"));
        add(publicIds, XmlIdentifiers.DATATYPES_PUBLIC, locationFor("datatypes.dtd"));
        add(systemIds, XmlIdentifiers.XML_2001_XSD, locationFor("xml.xsd"));

        // from J2EE 1.2
        add(publicIds, XmlIdentifiers.WEB_22_PUBLIC, locationFor("web-app_2_2.dtd"));
        add(publicIds, XmlIdentifiers.TLD_11_PUBLIC, locationFor("web-jsptaglibrary_1_1.dtd"));

        // from J2EE 1.3
        add(publicIds, XmlIdentifiers.WEB_23_PUBLIC, locationFor("web-app_2_3.dtd"));
        add(publicIds, XmlIdentifiers.TLD_12_PUBLIC, locationFor("web-jsptaglibrary_1_2.dtd"));

        // from J2EE 1.4
        add(systemIds, "http://www.ibm.com/webservices/xsd/j2ee_web_services_1_1.xsd",
                locationFor("j2ee_web_services_1_1.xsd"));
        add(systemIds, "http://www.ibm.com/webservices/xsd/j2ee_web_services_client_1_1.xsd",
                locationFor("j2ee_web_services_client_1_1.xsd"));
        add(systemIds, XmlIdentifiers.WEB_24_XSD, locationFor("web-app_2_4.xsd"));
        add(systemIds, XmlIdentifiers.TLD_20_XSD, locationFor("web-jsptaglibrary_2_0.xsd"));
        addSelf(systemIds, "j2ee_1_4.xsd");
        addSelf(systemIds, "jsp_2_0.xsd");

        // from JavaEE 5
        add(systemIds, XmlIdentifiers.WEB_25_XSD, locationFor("web-app_2_5.xsd"));
        add(systemIds, XmlIdentifiers.TLD_21_XSD, locationFor("web-jsptaglibrary_2_1.xsd"));
        addSelf(systemIds, "javaee_5.xsd");
        addSelf(systemIds, "jsp_2_1.xsd");
        addSelf(systemIds, "javaee_web_services_1_2.xsd");
        addSelf(systemIds, "javaee_web_services_client_1_2.xsd");

        // from JavaEE 6
        add(systemIds, XmlIdentifiers.WEB_30_XSD, locationFor("web-app_3_0.xsd"));
        add(systemIds, XmlIdentifiers.WEB_FRAGMENT_30_XSD, locationFor("web-fragment_3_0.xsd"));
        addSelf(systemIds, "web-common_3_0.xsd");
        addSelf(systemIds, "javaee_6.xsd");
        addSelf(systemIds, "jsp_2_2.xsd");
        addSelf(systemIds, "javaee_web_services_1_3.xsd");
        addSelf(systemIds, "javaee_web_services_client_1_3.xsd");

        // from JavaEE 7
        add(systemIds, XmlIdentifiers.WEB_31_XSD, locationFor("web-app_3_1.xsd"));
        add(systemIds, XmlIdentifiers.WEB_FRAGMENT_31_XSD, locationFor("web-fragment_3_1.xsd"));
        addSelf(systemIds, "web-common_3_1.xsd");
        addSelf(systemIds, "javaee_7.xsd");
        addSelf(systemIds, "jsp_2_3.xsd");
        addSelf(systemIds, "javaee_web_services_1_4.xsd");
        addSelf(systemIds, "javaee_web_services_client_1_4.xsd");

        SERVLET_API_PUBLIC_IDS = Collections.unmodifiableMap(publicIds);
        SERVLET_API_SYSTEM_IDS = Collections.unmodifiableMap(systemIds);
    }

    private static void addSelf(Map ids, String id) {
        String location = locationFor(id);
        if (location != null) {
            ids.put(id, location);
            ids.put(location, location);
        }
    }

    private static void add(Map ids, String id, String location) {
        if (location != null) {
            ids.put(id, location);
        }
    }

    private static String locationFor(String name) {
        URL location = CLASS_SERVLET_CONTEXT.getResource("resources/" + name);
        if (location == null && CLASS_JSP_CONTEXT != null) {
            location = CLASS_JSP_CONTEXT.getResource("resources/" + name);
        }
        if (location == null) {
            JasperLogger.ROOT_LOGGER.warnf("Missing schema %s", name);
            return null;
        }
        return location.toExternalForm();
    }



}