/**
    * Copyright 2005-2016 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.rice.krad.uif.view;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.log4j.Logger;
  import org.kuali.rice.core.api.CoreApiServiceLocator;
  import org.kuali.rice.core.api.config.property.ConfigurationService;
  import org.kuali.rice.krad.datadictionary.parse.BeanTag;
  import org.kuali.rice.krad.datadictionary.parse.BeanTagAttribute;
  import org.kuali.rice.krad.datadictionary.parse.BeanTags;
  import org.kuali.rice.krad.datadictionary.uif.UifDictionaryBeanBase;
  import org.kuali.rice.krad.uif.UifConstants;
  import org.kuali.rice.krad.util.KRADConstants;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.Serializable;
  import java.net.URL;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Properties;
  
  /**
   * Holds a configuration of CSS and JS assets that provides the base for one or more views.
   *
   * <p>
   * The list of CSS and JS files that are sourced in for a view come from its theme, along with any
   * additional files configured for the specific view. Generally an application will have one theme for the
   * entire application.
   *
   * The theme has logic for 'dev' mode versus 'test/prod' mode. This is controlled through the
   * {@code rice.krad.dev.mode} configuration variable. In development mode it will source in all the CSS
   * and JS files individually (to allow for easier debugging). In non-development mode it will source in a
   * minified file. The path for the minified files can be specified by setting {@link #getMinCssFile()} and
   * {@link #getMinScriptFile()}. If not set, it will be formed by using the {@link #getName()},
   * {@link #getMinVersionSuffix()}, and min suffix (this is the file name generated by the theme builder). To
   * indicate the min file should not be sourced in regardless of the environment, set the property
   * {@link #isIncludeMinFiles()} to false
   *
   * The path to the minified file is determined by {@link #getDirectory()}. It this is not set, it is defaulted to
   * be '/themes' plus the name of the theme (eg '/themes/kboot')
   * </p>
   *
   * <p>
   * There are two ways the theme can be configured, manual or by convention. If you want to manually configured the
   * view theme, set {@link #isUsesThemeBuilder()} to false. For dev mode, you must then set the {@link
   * #getMinCssSourceFiles()} and {@link #getMinScriptSourceFiles()} lists to the theme files. For configuration
   * by convention, only the theme {@link #getName()} is required. The directory will be assumed to be '/themes/{name}'.
   * Furthermore the list of min CSS and JS files will be retrieved from the theme.properties file created by the
   * theme builder
   * </p>
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  @BeanTags({@BeanTag(name = "theme", parent = "Uif-ViewTheme"),
          @BeanTag(name = "kbootTheme", parent = "Uif-KbootTheme")})
  public class ViewTheme extends UifDictionaryBeanBase implements Serializable {
      private static final long serialVersionUID = 7063256242857896580L;
      private static final Logger LOG = Logger.getLogger(ViewTheme.class);
  
      private String name;
  
      private String directory;
      private String imageDirectory;
  
      private String minVersionSuffix;
      private boolean includeMinFiles;
      private String minCssFile;
      private String minScriptFile;
      private List<String> minCssSourceFiles;
      private List<String> minScriptSourceFiles;
  
      private List<String> cssFiles;
      private List<String> scriptFiles;
  
      private boolean usesThemeBuilder;
  
      public ViewTheme() {
          super();
  
          this.includeMinFiles = true;
          this.minCssSourceFiles = new ArrayList<String>();
          this.minScriptSourceFiles = new ArrayList<String>();
  
         this.cssFiles = new ArrayList<String>();
         this.scriptFiles = new ArrayList<String>();
 
         this.usesThemeBuilder = true;
     }
 
     /**
      * Invoked by View#performApplyModel method to setup defaults for the theme
      *
      * <p>
      * Checks whether we are in dev mode, if so it adds all the CSS and JS files as resources. If
      * {@link #isUsesThemeBuilder()} is true, retrieve the theme-derived.properties file in the theme
      * directory to get the listing of CSS and JS files for theme
      *
      * When not in dev mode, builds the min file name and path for CSS and JS, which is added to
      * the list that is sourced in
      * </p>
      */
     public void configureThemeDefaults() {
         // in development mode, use the min source files directly (for debugging)
         if (inDevMode()) {
             if (this.usesThemeBuilder) {
                 setMinFileLists();
             }
 
             this.cssFiles.addAll(0, this.minCssSourceFiles);
             this.scriptFiles.addAll(0, this.minScriptSourceFiles);
         }
         // when not in development mode and min files are to be sourced in, build the min file
         // names and push to top of css and script file lists
         else if (this.includeMinFiles) {
             if (StringUtils.isBlank(this.minVersionSuffix)) {
                 this.minVersionSuffix = getConfigurationService().getPropertyValueAsString(
                         KRADConstants.ConfigParameters.APPLICATION_VERSION);
             }
 
             String themeDirectory = getThemeDirectory();
             if (StringUtils.isBlank(this.minCssFile)) {
                 String minCssFileName = this.name
                         + "."
                         + this.minVersionSuffix
                         + UifConstants.FileExtensions.MIN
                         + UifConstants.FileExtensions.CSS;
 
                 this.minCssFile =
                         themeDirectory + "/" + UifConstants.DEFAULT_STYLESHEETS_DIRECTORY + "/" + minCssFileName;
             }
 
             if (StringUtils.isBlank(this.minScriptFile)) {
                 String minScriptFileName = this.name
                         + "."
                         + this.minVersionSuffix
                         + UifConstants.FileExtensions.MIN
                         + UifConstants.FileExtensions.JS;
 
                 this.minScriptFile =
                         themeDirectory + "/" + UifConstants.DEFAULT_SCRIPTS_DIRECTORY + "/" + minScriptFileName;
             }
 
             this.cssFiles.add(0, this.minCssFile);
             this.scriptFiles.add(0, this.minScriptFile);
         }
     }
 
     /**
      * Retrieves the directory associated with the theme
      *
      * <p>
      * If {@link #getDirectory()} is not configured, the theme directory is assumed to be located in the
      * 'themes' folder of the web root. The directory name is assumed to be the name of the theme
      * </p>
      *
      * @return String path to theme directory relative to the web root
      */
     public String getThemeDirectory() {
         String themeDirectory;
 
         if (StringUtils.isNotBlank(this.directory)) {
             if (this.directory.startsWith("/")) {
                 this.directory = this.directory.substring(1);
             }
 
             themeDirectory = this.directory;
         } else {
             themeDirectory = UifConstants.DEFAULT_THEMES_DIRECTORY.substring(1) + "/" + this.name;
         }
 
         return themeDirectory;
     }
 
     /**
      * Sets the {@link #getMinScriptSourceFiles()} and {@link #getMinCssSourceFiles()} lists from the
      * corresponding properties in the theme properties file.
      *
      * <p>In dev mode, any css files that were generate from Less files are replaced with an include for
      * the Less file. This is so the less files can be modified directly (without running the theme builder. For
      * more information see <a href="http://lesscss.org/#usage">Less Usage</a></p>
      */
     protected void setMinFileLists() {
         Properties themeProperties = null;
         try {
             themeProperties = getThemeProperties();
         } catch (IOException e) {
             throw new RuntimeException("Unable to retrieve theme properties for theme: " + this.name, e);
         }
 
         if (themeProperties == null) {
             LOG.warn("No theme properties file found for theme with name: " + this.name);
 
             return;
         }
 
         String[] cssFiles = getPropertyValue(themeProperties, UifConstants.THEME_CSS_FILES);
         String[] lessFiles = getPropertyValue(themeProperties, UifConstants.THEME_LESS_FILES);
 
         if (cssFiles != null) {
             for (String cssFile : cssFiles) {
                 String includeFile = replaceIncludeWithLessFile(cssFile, lessFiles);
                 this.minCssSourceFiles.add(includeFile);
             }
         }
 
         String[] jsFiles = getPropertyValue(themeProperties, UifConstants.THEME_JS_FILES);
 
         if (jsFiles != null) {
             for (String jsFile : jsFiles) {
                 this.minScriptSourceFiles.add(jsFile);
             }
         }
 
         String[] devJSFiles = getPropertyValue(themeProperties, UifConstants.THEME_DEV_JS_FILES);
 
         if (devJSFiles != null) {
             for (String jsFile : devJSFiles) {
                 this.minScriptSourceFiles.add(jsFile);
             }
         }
     }
 
     /**
      * Retrieves the theme properties associated with the theme
      *
      * <p>
      * The theme builder creates a file named {@link org.kuali.rice.krad.uif.UifConstants#THEME_DERIVED_PROPERTY_FILE}
      * located in the theme directory. Here the path is formed and loaded into a properties object
      * </p>
      *
      * @return Properties object containing theme properties, or null if the properties file was not found
      * @throws IOException
      */
     protected Properties getThemeProperties() throws IOException {
         Properties themeProperties = null;
 
         String appUrl = getConfigurationService().getPropertyValueAsString(
                 KRADConstants.ConfigParameters.APPLICATION_URL);
         String propertiesUrlPath = appUrl + "/" + getThemeDirectory() + "/" + UifConstants.THEME_DERIVED_PROPERTY_FILE;
 
         InputStream inputStream = null;
         try {
             URL propertiesUrl = new URL(propertiesUrlPath);
             inputStream = propertiesUrl.openStream();
 
             themeProperties = new Properties();
             themeProperties.load(inputStream);
         } finally {
             if (inputStream != null) {
                 inputStream.close();
             }
         }
 
         return themeProperties;
     }
 
     /**
      * Helper method to retrieve the value of a property from the given Properties object as a
      * string array (string is parsed using comma delimiter)
      *
      * @param properties properties object to pull property value from
      * @param key key for the property to retrieve
      * @return string array parsed from the property value, or null if property was not found or empty
      */
     protected String[] getPropertyValue(Properties properties, String key) {
         String[] propertyValueArray = null;
 
         if (properties.containsKey(key)) {
             String propertyValueString = properties.getProperty(key);
 
             if (propertyValueString != null) {
                 propertyValueArray = propertyValueString.split(",");
             }
         }
 
         return propertyValueArray;
     }
 
     /**
      * Attempts to find a Less file match for the given css file, and if found returns the corresponding Less
      * file path, otherwise the css path is returned unmodified.
      *
      * @param cssFilePath path to css file to find Less files for
      * @param lessFileNames array of less files names that are available for the theme
      * @return String path to less file include, or original css file include
      */
     protected String replaceIncludeWithLessFile(String cssFilePath, String[] lessFileNames) {
         if (lessFileNames == null || !includeLess()) {
             return cssFilePath;
         }
 
         for (String lessFileName : lessFileNames) {
             String lessFileMatch = StringUtils.replace(lessFileName, UifConstants.FileExtensions.LESS,
                     UifConstants.FileExtensions.CSS);
 
             if (StringUtils.substringAfterLast(cssFilePath, "/").equals(lessFileMatch)) {
                 return StringUtils.replace(cssFilePath, UifConstants.FileExtensions.CSS,
                         UifConstants.FileExtensions.LESS);
             }
         }
 
         return cssFilePath;
     }
 
     /**
      * Indicates whether operation is in development mode by checking the KRAD configuration parameter
      *
      * @return true if in dev mode, false if not
      */
     protected boolean inDevMode() {
         return getConfigurationService().getPropertyValueAsBoolean(KRADConstants.ConfigParameters.KRAD_DEV_MODE);
     }
 
     /**
      * Indicates whether Less files should be included instead of Css files when running in dev mode.
      *
      * @return true if less files should be subsituted, false if not
      */
     protected boolean includeLess() {
         return getConfigurationService().getPropertyValueAsBoolean(KRADConstants.ConfigParameters.KRAD_INCLUDE_LESS);
     }
 
     /**
      * A name that identifies the view theme, when using the theme builder this should be the same as
      * the directory (for example, if directory is '/themes/kboot', the theme name will be 'kboot')
      *
      * <p>
      * <b>When using the theme builder (config by convention), the name is required configuration</b>
      * </p>
      *
      * @return name for the theme
      */
     @BeanTagAttribute
     public String getName() {
         return name;
     }
 
     /**
      * Setter for the theme name
      *
      * @param name
      */
     public void setName(String name) {
         this.name = name;
     }
 
     /**
      * Path to the directory (relative to the web root) that holds the assets for the theme
      *
      * <p>
      * When using the theme builder the directory is not required and will default to '/themes/{name}'
      * </p>
      *
      * @return path to theme directory
      */
     @BeanTagAttribute
     public String getDirectory() {
         return directory;
     }
 
     /**
      * Setter for the theme directory path
      *
      * @param directory
      */
     public void setDirectory(String directory) {
         this.directory = directory;
     }
 
     /**
      * Path to the directory (relative to the web root) that contains images for the theme
      *
      * <p>
      * Configured directory will populate the {@link org.kuali.rice.krad.uif.UifConstants.ContextVariableNames#THEME_IMAGES}
      * context variable which can be referenced with an expression for an image source
      * </p>
      *
      * <p>
      * When using the theme builder the image directory is not required and will default to a sub directory of the
      * theme directory with name 'images'
      * </p>
      *
      * @return theme image directory
      */
     @BeanTagAttribute
     public String getImageDirectory() {
         if (StringUtils.isBlank(this.imageDirectory)) {
             String appUrl = getConfigurationService().getPropertyValueAsString(
                     KRADConstants.ConfigParameters.APPLICATION_URL);
 
             this.imageDirectory =
                     appUrl + "/" + getThemeDirectory() + "/" + UifConstants.DEFAULT_IMAGES_DIRECTORY + "/";
         }
 
         return imageDirectory;
     }
 
     /**
      * Setter for the directory that contains images for the theme
      *
      * @param imageDirectory
      */
     public void setImageDirectory(String imageDirectory) {
         this.imageDirectory = imageDirectory;
     }
 
     /**
      * When the min file paths are not set, the min file names will be generated using the theme
      * name, version, and the min suffix. This property is set to indicate the version number to use
      *
      * <p>
      * For application themes this can be set to the config parameter ${app.version}
      * </p>
      *
      * @return version string for the min file name
      */
     @BeanTagAttribute
     public String getMinVersionSuffix() {
         return minVersionSuffix;
     }
 
     /**
      * Setter for the min file version string
      *
      * @param minVersionSuffix
      */
     public void setMinVersionSuffix(String minVersionSuffix) {
         this.minVersionSuffix = minVersionSuffix;
     }
 
     /**
      * Indicates the min files should be sourced into the CSS and JS lists when not in development mode (this
      * is regardless of whether theme builder is being used or not)
      *
      * <p>
      * Default is true for including min files
      * </p>
      *
      * @return true if min files should be sourced in, false if not
      */
     @BeanTagAttribute
     public boolean isIncludeMinFiles() {
         return includeMinFiles;
     }
 
     /**
      * Setter for including min files in the CSS and JS lists
      *
      * @param includeMinFiles
      */
     public void setIncludeMinFiles(boolean includeMinFiles) {
         this.includeMinFiles = includeMinFiles;
     }
 
     /**
      * File path for the minified CSS file
      *
      * <p>
      * When min file is not set it will be generated by using the theme directory, name, version, and min prefix.
      * This corresponds to the min file names generated by the theme builder
      *
      * For example, with name 'kboot' and version '2.3.0' the min file name will be
      * '/themes/kboot/stylesheets/kboot.2.3.0.min.css'
      * </p>
      *
      * @return path of min css file
      */
     @BeanTagAttribute
     public String getMinCssFile() {
         return minCssFile;
     }
 
     /**
      * Setter for the min CSS file path
      *
      * @param minCssFile
      */
     public void setMinCssFile(String minCssFile) {
         this.minCssFile = minCssFile;
     }
 
     /**
      * File path for the minified JS file
      *
      * <p>
      * When min file is not set it will be generated by using the theme directory, name, version, and min prefix.
      * This corresponds to the min file names generated by the theme builder
      *
      * For example, with name 'kboot' and version '2.3.0' the min file name will be
      * '/themes/kboot/scripts/kboot.2.3.0.min.js'
      * </p>
      *
      * @return path of min css file
      */
     @BeanTagAttribute
     public String getMinScriptFile() {
         return minScriptFile;
     }
 
     /**
      * Setter for the min JS file path
      *
      * @param minScriptFile
      */
     public void setMinScriptFile(String minScriptFile) {
         this.minScriptFile = minScriptFile;
     }
 
     /**
      * List of file paths (relative to web root) or URLs that make up the minified CSS file
      *
      * <p>
      * In development mode, instead of sourcing in the min CSS file, the list of files specified here will
      * be included. This is to facilitate easier debugging. When using the theme builder this list is automatically
      * retrieved and populated from the theme properties
      * </p>
      *
      * @return list of min CSS file paths or URLs
      */
     @BeanTagAttribute
     public List<String> getMinCssSourceFiles() {
         return minCssSourceFiles;
     }
 
     /**
      * Setter for the min file CSS list
      *
      * @param minCssSourceFiles
      */
     public void setMinCssSourceFiles(List<String> minCssSourceFiles) {
         this.minCssSourceFiles = minCssSourceFiles;
     }
 
     /**
      * List of file paths (relative to web root) or URLs that make up the minified JS file
      *
      * <p>
      * In development mode, instead of sourcing in the min JS file, the list of files specified here will
      * be included. This is to facilitate easier debugging. When using the theme builder this list is automatically
      * retrieved and populated from the theme properties
      * </p>
      *
      * @return list of min JS file paths or URLs
      */
     @BeanTagAttribute
     public List<String> getMinScriptSourceFiles() {
         return minScriptSourceFiles;
     }
 
     /**
      * Setter for the min file JS list
      *
      * @param minScriptSourceFiles
      */
     public void setMinScriptSourceFiles(List<String> minScriptSourceFiles) {
         this.minScriptSourceFiles = minScriptSourceFiles;
     }
 
     /**
      * List of file paths (relative to the web root) or URLs that will be sourced into the view
      * as CSS files
      *
      * <p>
      * Generally this list should be left empty, and the min file lists configured instead (or none with
      * theme builder). However if there are resources that are not part of the minified CSS file that should
      * be included with the theme they can be added here
      *
      * The minified file path (or list of individual files that make up the minification) will be added
      * to the beginning of this list. Therefore any entries explicitly added through configuration will be
      * sourced in last
      * </p>
      *
      * @return list of file paths or URLs for CSS
      */
     @BeanTagAttribute
     public List<String> getCssFiles() {
         return cssFiles;
     }
 
     /**
      * Setter for the list of CSS files that should be sourced in along with the minified files
      *
      * @param cssFiles
      */
     public void setCssFiles(List<String> cssFiles) {
         this.cssFiles = cssFiles;
     }
 
     /**
      * List of file paths (relative to the web root) or URLs that will be sourced into the view
      * as JS files
      *
      * <p>
      * Generally this list should be left empty, and the min file lists configured instead (or none with
      * theme builder). However if there are resources that are not part of the minified JS file that should
      * be included with the theme they can be added here
      *
      * The minified file path (or list of individual files that make up the minification) will be added
      * to the beginning of this list. Therefore any entries explicitly added through configuration will be
      * sourced in last
      * </p>
      *
      * @return list of file paths or URLs for JS
      */
     @BeanTagAttribute
     public List<String> getScriptFiles() {
         return scriptFiles;
     }
 
     /**
      * Setter for the list of JS files that should be sourced in along with the minified files
      *
      * @param scriptFiles
      */
     public void setScriptFiles(List<String> scriptFiles) {
         this.scriptFiles = scriptFiles;
     }
 
     /**
      * Indicates whether the theme has been built (or will be built) using the theme builder and therefore
      * the theme configuration can be defaulted according to the conventions used by the builder
      *
      * <p>
      * When set to true, only the {@link #getName()} property is required to be configured for the theme. All
      * other configuration will be determined based on convention. When manually configuring the theme, this flag
      * should be turned off (by default this flag is on)
      * </p>
      *
      * @return true if the theme uses the theme builder, false if not
      */
     @BeanTagAttribute
     public boolean isUsesThemeBuilder() {
         return usesThemeBuilder;
     }
 
     /**
      * Setter the indicates whether the theme uses the theme builder
      *
      * @param usesThemeBuilder
      */
     public void setUsesThemeBuilder(boolean usesThemeBuilder) {
         this.usesThemeBuilder = usesThemeBuilder;
     }
 
     /**
      * Helper method to retrieve an instance of {@link org.kuali.rice.core.api.config.property.ConfigurationService}
      *
      * @return instance of ConfigurationService
      */
     public ConfigurationService getConfigurationService() {
         return CoreApiServiceLocator.getKualiConfigurationService();
     }
 
 }