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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.
 *
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 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 *
 * Modifications:
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package org.glassfish.grizzly.samples.spdy;

import java.io.File;
import java.io.Writer;
import org.glassfish.grizzly.http.server.HttpHandler;
import org.glassfish.grizzly.http.server.Request;
import org.glassfish.grizzly.http.server.Response;
import org.glassfish.grizzly.http.util.HttpStatus;
import org.glassfish.grizzly.spdy.PushResource;
import org.glassfish.grizzly.spdy.Source;
import org.glassfish.grizzly.spdy.SpdyStream;

/**
 * The {@link HttpHandler} to serve HTML page referencing 48 smiley images.
 * When requesting this page user may specify the smiley image size: 16 and 64;
 * and specify if SPDY Server-Push has to be used to send smiley images before
 * the client explicitly request them.
 * 
 * In order to specify the image size the "size" parameter has to be used
 * (supported values are 16 and 64).
 * In order to enable/disable SPDY Server-Push the "push" parameter has to be
 * used (supported values are true, false).
 * 
 * For example to request smileys with size 64x64 using SPDY Server-Push mode, the
 * request should look like: https://localhost:8080/getsmileys?size=64&push=true
 * 
 * @author Alexey Stashok
 */
public class SmileysHandler extends HttpHandler {
    private final String smileysContextPath;
    private final File smileysRoot;

    /**
     * Construct SmileysHandler
     * 
     * @param smileysContextPath the context-path for the smiley image requests.
     * @param smileysRoot the root folder where the smiley images are located.
     */
    public SmileysHandler(String smileysContextPath, File smileysRoot) {
        this.smileysContextPath = smileysContextPath;
        this.smileysRoot = smileysRoot;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void service(Request request, Response response) throws Exception {
        
        // check the image size parameter
        final String sizeParamValue = request.getParameter("size");
        if (sizeParamValue == null) {
            response.sendError(400, "The size parameter is not specified");
            return;
        }
        
        // parse the image size
        final int iconSize;
        try {
            iconSize = Integer.parseInt(sizeParamValue);
        } catch (NumberFormatException e) {
            response.sendError(400, "The size parameter must be an integer value");
            return;
        }
        
        // find the smileys folder with the given size
        final String folderName = iconSize + "x" + iconSize;
        final File smileysFolder = new File(smileysRoot, folderName);
        if (!smileysFolder.exists() || !smileysFolder.isDirectory()) {
            response.sendError(404,
                    "The smileys folder " + folderName + " is not found!");
            return;
        }
        
        final boolean isPush = Boolean.valueOf(request.getParameter("push"));
        
        final int smileysPerRow = 4;
        final int totalSmileys = 48;

        // check if SPDY Server-Push mode is on
        if (isPush) {
            // If SPDY Server-Push mode is on - push smileys images
            final SpdyStream spdyStream = (SpdyStream) request.getAttribute(
                    SpdyStream.SPDY_STREAM_ATTRIBUTE);
            
            // if spdyStream == null - it's not SPDY request
            if (spdyStream != null) {
                // Compose the root URL for smileys to be pushed
                final String smileyRootUrl =
                        new StringBuilder(request.getScheme())
                        .append("://").append(request.getServerName())
                        .append(':').append(request.getServerPort())
                        .append(smileysContextPath).toString();
                
                for (int i = 0; i < totalSmileys; i++) {
                    final String url = smileyRootUrl + folderName + "/" + (i + 1) + ".png";
                    spdyStream.addPushResource(url,
                            PushResource.builder()
                            .contentType("image/png")
                            .statusCode(HttpStatus.OK_200)
                            .source(
                                Source.factory(spdyStream)
                                .createFileSource(new File(smileysFolder,
                                                        (i + 1) + ".png")))
                            .build());
                }
            }
        }
        
        // Compose the main HTML page
        response.setContentType("text/html");
        final Writer writer = response.getWriter();
        writer.write("Grizzly SPDY sample");
        writer.write("");
        writer.write("");
        
        int n = 1;
        for (int i = 0; i < totalSmileys / smileysPerRow; i++) {
            writer.write("");
            for (int j = 0; j < smileysPerRow; j++) {
                writer.write("");
            }
            
            writer.write("");
        }
        
        writer.write("");
                writer.write("");
                writer.write("");
        writer.write("");
    }
}