/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2012, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.picketlink.http.internal;

import org.picketlink.Identity;
import org.picketlink.common.properties.Property;
import org.picketlink.common.properties.query.AnnotatedPropertyCriteria;
import org.picketlink.common.properties.query.PropertyQueries;
import org.picketlink.credential.DefaultLoginCredentials;
import org.picketlink.idm.PartitionManager;
import org.picketlink.idm.model.annotation.StereotypeProperty;
import org.picketlink.internal.el.ELProcessor;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.security.Principal;
import java.util.List;

import static org.picketlink.authorization.util.AuthorizationUtil.hasRole;

/**
 * <p>PicketLink wrapper to {@link javax.servlet.http.HttpServletRequest} instances.</p>
 *
 * <p>This class provides a better integration with Servlet API.</p>
 *
 * @author Pedro Igor
 */
public class PicketLinkHttpServletRequest extends HttpServletRequestWrapper {

    private final Identity identity;
    private final ELProcessor elProcessor;
    private final DefaultLoginCredentials credentials;
    private final PartitionManager partitionManager;
    private final String requestedUri;

    PicketLinkHttpServletRequest(HttpServletRequest request, Identity identity, DefaultLoginCredentials credentials, PartitionManager partitionManager, ELProcessor elProcessor) {
        super(request);
        this.identity = identity;
        this.credentials = credentials;
        this.partitionManager = partitionManager;
        this.elProcessor = elProcessor;
        this.requestedUri = rewriteUri(request);
    }

    @Override
    public void login(String username, String password) throws ServletException {
        this.credentials.setUserId(username);
        this.credentials.setPassword(password);
        this.identity.login();
    }

    @Override
    public void logout() throws ServletException {
        if (isLoggedIn()) {
            this.identity.logout();
        }
        super.logout();
    }

    @Override
    public Principal getUserPrincipal() {
        if (!isLoggedIn()) {
            return null;
        }

        return new Principal() {
            @Override
            public String getName() {
                List<Property<Object>> result = PropertyQueries.createQuery(identity.getAccount().getClass())
                    .addCriteria(new AnnotatedPropertyCriteria(StereotypeProperty.class))
                    .getResultList();

                for (Property stereotypeProperty : result) {
                    StereotypeProperty stereotypePropertyAnnotation = stereotypeProperty.getAnnotatedElement()
                        .getAnnotation(StereotypeProperty.class);

                    if (StereotypeProperty.Property.IDENTITY_USER_NAME.equals(stereotypePropertyAnnotation.value())) {
                        Object userName = stereotypeProperty.getValue(identity.getAccount());

                        if (userName != null) {
                            return userName.toString();
                        }
                    }
                }

                return null;
            }
        };
    }

    @Override
    public String getRequestURI() {
        return this.requestedUri;
    }

    @Override
    public boolean isUserInRole(String roleName) {
        if (isLoggedIn()) {
            return hasRole(this.identity, this.partitionManager, roleName);
        }

        return super.isUserInRole(roleName);
    }

    private boolean isLoggedIn() {
        return this.identity.isLoggedIn();
    }

    private String rewriteUri(HttpServletRequest request) {
        String requestedUri = request.getRequestURI();
        String rewrittenUri = requestedUri;

        if (requestedUri.indexOf('{') != -1) {
            StringBuilder template = null;

            for (int i = 0; i < requestedUri.length(); i++) {
                char charAt = requestedUri.charAt(i);

                if (charAt == '{') {
                    template = new StringBuilder();

                    template.append(charAt);

                    continue;
                }

                if (template != null) {
                    template.append(charAt);

                    if (charAt == '}') {
                        Object eval = this.elProcessor.eval("#" + template.toString());

                        if (eval == null) {
                            break;
                        }

                        String templateString = template.toString().replace("{", "\\{").replace("}", "\\}");
                        rewrittenUri = rewrittenUri.replaceFirst(templateString, eval.toString());
                        template = null;
                    }
                }
            }
        }

        return rewrittenUri;
    }
}