/*
 * Copyright 2012 david gonzalez.
 *
 * Licensed 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 com.activecq.samples.servlets.impl;

import org.apache.felix.scr.annotations.Properties;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.sling.SlingServlet;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.servlets.OptingServlet;
import org.apache.sling.api.servlets.SlingSafeMethodsServlet;
import org.osgi.framework.Constants;

import javax.servlet.ServletException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * @author david
 */
@SlingServlet(
        label = "Samples - Sling Safe Methods Servlet",
        description = "Sample implementation of a Sling All Methods Servlet.",
        paths = {"/services/safe-sample"},
        methods = {"GET"}, // Ignored if paths is set - Defaults to GET if not specified
        resourceTypes = {}, // Ignored if paths is set
        selectors = {"print.a4", "print"}, // Ignored if paths is set
        extensions = {"html"} // Ignored if paths is set
)
@Properties({
        @Property(
                label = "Vendor",
                name = Constants.SERVICE_VENDOR,
                value = "ActiveCQ",
                propertyPrivate = true
        )
})
public class SampleSafeMethodsServlet extends SlingSafeMethodsServlet implements OptingServlet {

    /**
     * Add overrides for other SlingSafeMethodsServlet here (doGeneric, doHead, doOptions, doTrace) *
     */

    @Override
    protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {
        // Implement custom handling of GET requests
        boolean responseIsText = true;

        if (responseIsText) {
            // Write a standard text/html response
            response.setContentType("text/html;charset=UTF-8");
            response.setCharacterEncoding("UTF-8");
            response.getWriter().write("<html><body>Text to write to response</body></html>");
        } else {
            // Write some binary data to the response; Such as sending back an Image or PDF
            InputStream input = new InputStream() {
                @Override
                public int read() throws IOException {
                    return 0;
                }
            };

            response.setContentType(getServletContext().getMimeType(request.getPathInfo()));
            OutputStream output = response.getOutputStream();
            byte[] buffer = new byte[8192];

            for (int length = 0; (length = input.read(buffer)) > 0; ) {
                output.write(buffer, 0, length);
                output.flush();
            }
        }
    }

    /**
     * OptingServlet Acceptance Method *
     */

    @Override
    public boolean accepts(SlingHttpServletRequest request) {
        /*
         * Add logic which inspects the request which determines if this servlet
         * should handle the request. This will only be executed if the
         * Service Configuration's paths/resourcesTypes/selectors accept the request.
         */
        return true;
    }
}