/**
    * Copyright 2010-2013 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.common.util.project;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Properties;
  
  import org.apache.commons.io.Charsets;
  import org.apache.commons.lang3.StringUtils;
  import org.kuali.common.util.Assert;
  import org.kuali.common.util.PropertyUtils;
  import org.kuali.common.util.Str;
  import org.kuali.common.util.maven.MavenConstants;
  import org.kuali.common.util.property.Constants;
  import org.springframework.util.PropertyPlaceholderHelper;
  
  public class DefaultProjectService implements ProjectService {
  
  	private static final Map<String, Project> CACHE = new HashMap<String, Project>();
  	private static final PropertyPlaceholderHelper PPH = Constants.DEFAULT_PROPERTY_PLACEHOLDER_HELPER;
  	private static final String PROPERTIES_ENCODING_KEY = "project.properties.encoding";
  	private static final String PROPERTIES_ENCODING_DEFAULT = Charsets.UTF_8.toString();
  
  	@Override
  	public Project getProject(Properties properties) {
  		String groupId = properties.getProperty(MavenConstants.GROUP_ID_KEY);
  		String artifactId = properties.getProperty(MavenConstants.ARTIFACT_ID_KEY);
  		String version = properties.getProperty(MavenConstants.VERSION_KEY);
  		return new ImmutableProject(groupId, artifactId, version, properties);
  
  	}
  
  	@Override
  	public Project getProject(String projectId) {
  
  		Assert.hasText(projectId, "projectId is blank");
  
  		Project project = CACHE.get(projectId);
  		if (project == null) {
  			project = loadAndCache(projectId);
  		}
  		return project;
  	}
  
  	protected Project loadAndCache(String projectId) {
  
  		// Split the id into tokens
  		String[] tokens = StringUtils.split(projectId, ":");
  
  		// Project id's should always have exactly 2 tokens
  		Assert.isTrue(tokens.length == 2, "tokens.length != 2");
  
  		// 1st token is groupId, 2nd token is artifactId
  		String groupId = tokens[0];
  		String artifactId = tokens[1];
  
  		// Get the unique path to the project.properties file
  		String location = getPropertiesFileLocation(groupId, artifactId);
  
  		// If that location doesn't exist, we have issues
  		Assert.exists(location, "[" + location + "] does not exist");
  
  		// Load system/environment properties
  		Properties global = PropertyUtils.getGlobalProperties();
  
  		// Use UTF-8 to load project.properties, unless they've set the system property "project.properties.encoding"
  		String encoding = global.getProperty(PROPERTIES_ENCODING_KEY, PROPERTIES_ENCODING_DEFAULT);
  
  		// Load the properties from disk
  		Properties properties = PropertyUtils.load(location, encoding);
  
  		// Convert the properties into a project
  		Project project = getProject(properties);
  
  		// Store the project in our cache
  		CACHE.put(projectId, project);
  
  		// Return the project
  		return project;
  	}
  
  	protected String getPropertiesFileLocation(String groupId, String artifactId) {
  		Properties properties = new Properties();
  		properties.setProperty(Constants.GROUP_ID_BASE_PATH_KEY, Str.getPath(groupId));
  		properties.setProperty(Constants.ARTIFACT_ID_KEY, artifactId);
 		return PPH.replacePlaceholders(Constants.PROJECT_PROPERTIES_LOCATION, properties);
 	}
 
 }