/*
    * Cloudformation Plugin for SonarQube
    * Copyright (C) 2019 James Pether Sörling
    * james@hack23.com
    *
    * This program 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 3 of the License, or (at your option) any later version.
   *
   * This program 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 program; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
   */
  package com.hack23.sonar.cloudformation;
  
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.nio.charset.StandardCharsets;
  import java.util.Set;
  
  import org.apache.commons.lang3.reflect.FieldUtils;
  import org.sonar.api.server.rule.RulesDefinition;
  import org.sonar.api.server.rule.RulesDefinitionXmlLoader;
  import org.sonar.api.utils.log.Logger;
  import org.sonar.api.utils.log.Loggers;
  
  /**
   * The Class CloudformationRulesDefinition.
   */
  public final class CloudformationRulesDefinition implements RulesDefinition {
  
  	/** The Constant LOGGER. */
  	private static final Logger LOGGER = Loggers.get(CloudformationRulesDefinition.class);
  
  	/** The Constant PATH_TO_RULES_XML. */
  	private static final String PATH_TO_RULES_XML = "/cloudformation-rules.xml";
  
  	/** The Constant PATH_TO_CHECKOV_CLOUDFORMATION_RULES_XML. */
  	private static final String PATH_TO_CHECKOV_CLOUDFORMATION_RULES_XML = "/cloudformation-checkov-cloudformation-rules.xml";
  
  	/** The Constant PATH_TO_CHECKOV_TERRAFOM_RULES_XML. */
  	private static final String PATH_TO_CHECKOV_TERRAFOM_RULES_XML = "/cloudformation-checkov-terraform-rules.xml";
  
  
  	/** The Constant KEY. */
  	public static final String KEY = "repo";
  
  	/** The Constant NAME. */
  	public static final String NAME = "repository";
  
  	/** The context. */
  	private Context context;
  
  	/** The xml loader. */
  	private final RulesDefinitionXmlLoader xmlLoader;
  
  	/**
  	 * Instantiates a new cloudformation rules definition.
  	 *
  	 * @param xmlLoader the xml loader
  	 */
  	public CloudformationRulesDefinition(final RulesDefinitionXmlLoader xmlLoader) {
  		super();
  		this.xmlLoader = xmlLoader;
  	}
  
  	/**
  	 * Gets the context.
  	 *
  	 * @return the context
  	 */
  	public Context getContext() {
  		return context;
  	}
  
  	/**
  	 * Define rules for cloudformation.
  	 *
  	 * @param context the context
  	 * @param repositoryKey the repository key
  	 * @param repositoryName the repository name
  	 * @param languageKey the language key
  	 */
  	private void defineRulesForCloudformation(final Context context, final String repositoryKey, final String repositoryName,
  			final String languageKey) {
  		final NewRepository repository = context.createRepository(repositoryKey, languageKey).setName(repositoryName);
  
  		addRules(repository, this.getClass().getResourceAsStream(PATH_TO_RULES_XML));
  		addRules(repository, this.getClass().getResourceAsStream(PATH_TO_CHECKOV_CLOUDFORMATION_RULES_XML));
  		repository.done();
  	}
  
  
 	/**
 	 * Define rules for terraform.
 	 *
 	 * @param context the context
 	 * @param repositoryKey the repository key
 	 * @param repositoryName the repository name
 	 * @param languageKey the language key
 	 */
 	private void defineRulesForTerraform(final Context context, final String repositoryKey, final String repositoryName,
 			final String languageKey) {
 		final NewRepository repository = context.createRepository(repositoryKey, languageKey).setName(repositoryName);
 		addRules(repository, this.getClass().getResourceAsStream(PATH_TO_CHECKOV_TERRAFOM_RULES_XML));
 		repository.done();
 	}
 
 
 	/**
 	 * Adds the rules.
 	 *
 	 * @param repository the repository
 	 * @param rulesXml the rules xml
 	 */
 	private void addRules(final NewRepository repository, final InputStream rulesXml) {
 		if (rulesXml != null) {
 			xmlLoader.load(repository, new InputStreamReader(rulesXml,StandardCharsets.UTF_8));
 			for (final NewRule newRule : repository.rules()) {
 				addNewRule(newRule);
 			}
 		}
 	}
 
 	/**
 	 * Adds the new rule.
 	 *
 	 * @param newRule the new rule
 	 */
 	private static void addNewRule(final NewRule newRule) {
 		try {
 			final Set<String> tags = (Set<String>) FieldUtils.readField(newRule, "tags", true);
 			for (final String tag : tags) {
 
 				if (tag.contains("cweid-")) {
 					newRule.addCwe(Integer.parseInt(tag.replace("cweid-", "")));
 				}
 
 				if (tag.contains("owasp-")) {
 					newRule.addOwaspTop10(OwaspTop10.valueOf(tag.replace("owasp-", "").toUpperCase()));
 				}
 			}
 		} catch (final IllegalAccessException e) {
 			LOGGER.warn("Problem parsing security tags", e);
 		}
 	}
 
 	/**
 	 * Define.
 	 *
 	 * @param context the context
 	 */
 	@Override
 	public void define(final Context context) {
 		this.context = context;
 		defineRulesForCloudformation(context, "cloudformation-plugin-cfn" ,"Cloudformation plugin(cfn) rules", "cloudformation");
 		defineRulesForTerraform(context, "cloudformation-plugin-terraform" ,"Cloudformation plugin(terrraform) Rules", "terraform");
 	}
 
 }