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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013-2016 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * 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:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
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 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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 */

package com.sun.enterprise.admin.servermgmt.domain;

import java.io.File;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import com.sun.enterprise.admin.servermgmt.DomainConfig;
import com.sun.enterprise.admin.servermgmt.DomainException;
import com.sun.enterprise.config.modularity.CustomizationTokensProviderFactory;
import com.sun.enterprise.config.modularity.customization.ConfigCustomizationToken;
import com.sun.enterprise.config.modularity.customization.CustomizationTokensProvider;
import com.sun.enterprise.config.modularity.customization.FileTypeDetails;
import com.sun.enterprise.config.modularity.customization.PortTypeDetails;
import com.sun.enterprise.universal.i18n.LocalStringsImpl;
import com.sun.enterprise.util.SystemPropertyConstants;
import com.sun.enterprise.util.net.NetUtils;

/**
 * Client class to retrieve customize tokens.
 */
public class CustomTokenClient {

    private static final LocalStringsImpl _strings = new LocalStringsImpl(DomainBuilder.class);
    /** Place holder for the PORT BASE value in domain.xml */
    public static final String PORTBASE_PLACE_HOLDER = "PORT_BASE";

    /** Place holder for the custom tokens in domain.xml */
    public static final String CUSTOM_TOKEN_PLACE_HOLDER = "TOKENS_HERE";
    public static final String DEFAULT_TOKEN_PLACE_HOLDER = "DEFAULT_TOKENS_HERE";

    private DomainConfig _domainConfig;

    public CustomTokenClient(DomainConfig domainConfig) {
        _domainConfig = domainConfig;
    }

    /**
     * Get's the substitutable custom tokens.
     *
     * @return {@link Map} of substitutable tokens, or empty Map
     *   if no custom token found.
     * @throws DomainException If error occurred in retrieving the
     *   custom tokens.
     */
    public Map getSubstitutableTokens() throws DomainException {
        CustomizationTokensProvider provider = CustomizationTokensProviderFactory.createCustomizationTokensProvider();
        Map generatedTokens = new HashMap();
        String lineSeparator = System.getProperty("line.separator");
        int noOfTokens = 0;
        try {
            List customTokens = provider.getPresentConfigCustomizationTokens();
            if (!customTokens.isEmpty()) {
                StringBuffer generatedSysTags = new StringBuffer();

                // Check presence of token place-holder
                Set usedPorts = new HashSet();
                Properties domainProps = _domainConfig.getDomainProperties();
                String portBase = (String)_domainConfig.get(DomainConfig.K_PORTBASE);

                Map filePaths = new HashMap(3, 1);
                filePaths.put(SystemPropertyConstants.INSTALL_ROOT_PROPERTY, System.getProperty(SystemPropertyConstants.INSTALL_ROOT_PROPERTY));
                filePaths.put(SystemPropertyConstants.INSTANCE_ROOT_PROPERTY, System.getProperty(SystemPropertyConstants.INSTANCE_ROOT_PROPERTY));
                filePaths.put(SystemPropertyConstants.JAVA_ROOT_PROPERTY, System.getProperty(SystemPropertyConstants.JAVA_ROOT_PROPERTY));
                noOfTokens = customTokens.size();
                for (ConfigCustomizationToken token : customTokens) {
                    String name = token.getName();
                    // Check for valid custom token parameters.
                    if (isNullOrEmpty(name) || isNullOrEmpty(token.getValue()) || isNullOrEmpty(token.getDescription())) {
                        throw new IllegalArgumentException(_strings.get("invalidTokenParameters", name, token.getValue(), token.getDescription()));
                    }
                    switch (token.getCustomizationType()) {
                        case PORT :
                            Integer port = null;
                            if (domainProps.containsKey(name)) {
                                port = Integer.valueOf(domainProps.getProperty(token.getName()));
                                if (!NetUtils.isPortFree(port)) {
                                    throw new DomainException(_strings.get("unavailablePort", port));
                                }
                            } else {
                                if (portBase != null && token.getTokenTypeDetails() instanceof PortTypeDetails) {
                                    PortTypeDetails portTypeDetails = (PortTypeDetails)token.getTokenTypeDetails();
                                    port = Integer.parseInt(portBase) + Integer.parseInt(portTypeDetails.getBaseOffset());
                                    if (!generatedTokens.containsKey(PORTBASE_PLACE_HOLDER)) {
                                        // Adding a token to persist port base value as a system tag
                                        generatedTokens.put(PORTBASE_PLACE_HOLDER, SystemPropertyTagBuilder.buildSystemTag(
                                                PORTBASE_PLACE_HOLDER, portBase));
                                    }
                                } else {
                                    port = Integer.valueOf(token.getValue());
                                }
                                // Find next available unused port by incrementing the port value by 1
                                while (!NetUtils.isPortFree(port) && !usedPorts.contains(port++));
                            }
                            usedPorts.add(port);
                            generatedSysTags.append(SystemPropertyTagBuilder.buildSystemTag(token, port.toString()));
                            break;
                        case FILE:
                            String path = token.getValue();
                            for (Map.Entry entry : filePaths.entrySet()) {
                                if (path.contains(entry.getKey())) {
                                    path = path.replace(entry.getKey(), entry.getValue());
                                    break;
                                }
                            }
                            if (token.getTokenTypeDetails() instanceof FileTypeDetails) {
                                FileTypeDetails details = (FileTypeDetails) token.getTokenTypeDetails();
                                File file = new File(path);
                                switch (details.getExistCondition()) {
                                    case MUST_EXIST:
                                        if (!file.exists()) {
                                            throw new DomainException(_strings.get("missingFile", file.getAbsolutePath()));
                                        }
                                        break;
                                    case MUST_NOT_EXIST:
                                        if (file.exists()) {
                                            throw new DomainException(_strings.get("filePresenceNotDesired", file.getAbsolutePath()));
                                        }
                                        break;
                                    case NO_OP:
                                        break;
                                }
                            }
                            generatedSysTags.append(SystemPropertyTagBuilder.buildSystemTag(token, path));
                            break;
                        case STRING:
                            generatedSysTags.append(SystemPropertyTagBuilder.buildSystemTag(token));
                            break;
                    }
                    if (--noOfTokens > 0) {
                        generatedSysTags.append(lineSeparator);
                    }
                }
                String tags = generatedSysTags.toString();
                if (!isNullOrEmpty(tags)) {
                    generatedTokens.put(CUSTOM_TOKEN_PLACE_HOLDER, tags);
                }
            }
            List defaultTokens = provider.getPresentDefaultConfigCustomizationTokens();
            if (!defaultTokens.isEmpty()) {
                StringBuffer defaultSysTags = new StringBuffer();
                noOfTokens = defaultTokens.size();
                for (ConfigCustomizationToken token : defaultTokens) {
                    defaultSysTags.append(SystemPropertyTagBuilder.buildSystemTag(token));
                    if (--noOfTokens > 0) {
                        defaultSysTags.append(lineSeparator);
                    }
                }
                generatedTokens.put(DEFAULT_TOKEN_PLACE_HOLDER, defaultSysTags.toString());
            }
        } catch (DomainException de) {
            throw de;
        } catch (Exception ex) {
            throw new DomainException(ex);
        }
        return generatedTokens;
    }

    /**
     * Check for empty or null input string.
     * @return true Only if given string string is null or empty.
     */
    private boolean isNullOrEmpty(String input) {
        return input == null || input.isEmpty();
    }

    /**
     * A builder class to build the custom tag.
     */
    private static class SystemPropertyTagBuilder {

        private static final String placeHolderTagWithDesc = "";
        private static final String placeHolderTagWithoutDesc = "";
        private static final String namePlaceHolder = "%%%NAME%%%";
        private static final String valuePlaceHolder = "%%%VALUE%%%";
        private static final String descriptionPlaceHolder = "%%%DESCRIPTION%%%";

        /**
         * Build the System tag for the given token & value.
         */
        private static String buildSystemTag(ConfigCustomizationToken token, String value) {
            String builtTag = placeHolderTagWithDesc.replace(valuePlaceHolder, value);
            builtTag = builtTag.replace(descriptionPlaceHolder, token.getDescription());
            builtTag = builtTag.replace(namePlaceHolder, token.getName());
            return builtTag;
        }

        private static String buildSystemTag(ConfigCustomizationToken token) {
            return buildSystemTag(token, token.getValue());
        }

        /**
         * Build the System tag for the given name & value.
         */
        private static String buildSystemTag(String name, String value) {
            String builtTag = placeHolderTagWithoutDesc.replace(valuePlaceHolder, value);
            builtTag = builtTag.replace(namePlaceHolder, name);
            return builtTag;
        }
    } 
}