/*
 *  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.causeway.viewer.wicket.ui.pages.accmngt;

import java.util.UUID;

import javax.inject.Inject;

import org.apache.wicket.Application;
import org.apache.wicket.Page;
import org.apache.wicket.request.Url;
import org.apache.wicket.request.UrlRenderer;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.request.mapper.parameter.PageParameters;

import org.apache.causeway.viewer.wicket.model.models.PageType;
import org.apache.causeway.viewer.wicket.ui.pages.EmailVerificationUrlService;
import org.apache.causeway.viewer.wicket.ui.pages.PageClassRegistry;

/**
 * An implementation of {@link org.apache.causeway.viewer.wicket.ui.pages.EmailVerificationUrlService}
 * that uses Wicket's the current {@link org.apache.wicket.request.cycle.RequestCycle} to create the link and
 * the special {@link org.apache.causeway.viewer.wicket.ui.pages.accmngt.AccountConfirmationMap}
 * stored in the {@link org.apache.wicket.Application application} as a temporary storage of
 * the non-encrypted data.
 */
public class EmailVerificationUrlServiceDefault implements EmailVerificationUrlService {

    private static final long serialVersionUID = 1L;
    private final PageClassRegistry pageClassRegistry;

    @Inject // strangely, this isn't a @com.google.inject.Inject
    public EmailVerificationUrlServiceDefault(PageClassRegistry pageClassRegistry) {
        this.pageClassRegistry = pageClassRegistry;
    }

    /**
     * Creates a url to the configured page for the given <em>pageType</em> by encrypting the given
     * <em>datum</em> as a first indexed parameter
     *
     * @param pageType The type of the page to link to
     * @param datum The data to encrypt in the url
     * @return The full url to the page with the encrypted data
     */
    @Override
    public String createVerificationUrl(final PageType pageType, final String datum) {
        final Class<? extends Page> pageClass = pageClassRegistry.getPageClass(pageType);
        return createVerificationUrl(pageClass, datum);
    }

    /**
     * Creates a url to the passed <em>pageClass</em> by encrypting the given
     * <em>datum</em> as a first indexed parameter
     *
     * @param pageClass The class of the page to link to
     * @param datum The data to encrypt in the url
     * @return The full url to the page with the encrypted data
     */
    @Override
    public String createVerificationUrl(final Class<? extends Page> pageClass, final String datum) {
        String uuid = UUID.randomUUID().toString();
        uuid = uuid.replace("-", "");

        final AccountConfirmationMap accountConfirmationMap = getAccountConfirmationMap();
        accountConfirmationMap.put(uuid, datum);

        final PageParameters parameters = new PageParameters();
        parameters.set(0, uuid);

        final String fullUrl = fullUrlFor(pageClass, parameters);
        return fullUrl;
    }

    protected String fullUrlFor(final Class<? extends Page> pageClass, final PageParameters parameters) {
        final RequestCycle requestCycle = RequestCycle.get();
        final CharSequence relativeUrl = requestCycle.urlFor(pageClass, parameters);
        final UrlRenderer urlRenderer = requestCycle.getUrlRenderer();
        final String fullUrl = urlRenderer.renderFullUrl(Url.parse(relativeUrl));
        return fullUrl;
    }

    protected AccountConfirmationMap getAccountConfirmationMap() {
        return Application.get().getMetaData(AccountConfirmationMap.KEY);
    }

}
