/*
    * Copyright 2011 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 1.0 (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/ecl1.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.student.datadictionary.util;
  
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.LinkedHashMap;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.commons.io.FileUtils;
  import org.apache.commons.lang.exception.ExceptionUtils;
  import org.kuali.rice.krad.datadictionary.DataObjectEntry;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.context.support.ClassPathXmlApplicationContext;
  
  public class DictionaryTesterHelper {
  
  	private static final Logger log = LoggerFactory.getLogger(DictionaryTesterHelper.class);
  	
  	private String outputDir;
  	private Collection<String> inputFiles;
  	private List<String> supportFiles;
  	
  	private Map<String, List<String>>inputFileToBeanNameMap = new LinkedHashMap<String, List<String>>();
  
  	private Set<String> missingDictionaryFiles;
  
  	private Set<String> invalidDictionaryFiles;
  	
  	
  
  	public DictionaryTesterHelper(String outputDir, Collection<String> inputFiles,
  			List<String> supportFiles) {
  		this.outputDir = outputDir;
  		this.inputFiles = inputFiles;
  		this.supportFiles = supportFiles;
  	}
  
  	// public void loadApplicationContext() {
  	// System.out.println
  	// ("DictionaryTesterHelper: begin loading application context");
  	//
  	// ac = new PathValidatingClassPathXmlApplicationContext();
  	//
  	// for (String candidateConfigFile : this.configFiles) {
  	// ac.addContextFile(candidateConfigFile);
  	// }
  	//
  	// ac.buildApplicationContext();
  	// System.out.println
  	// ("DictionaryTesterHelper: end loading application context");
  	// }
  	//
  	// public Map<String, DataObjectEntry> getDataObjectEntryBeans () {
  	// return (Map<String, DataObjectEntry>)
  	// ac.getBeansOfType(DataObjectEntry.class);
  	// }
  
  	public void doTest(String projectVersion, String formattedDate) {
  
  		missingDictionaryFiles = new LinkedHashSet<String>();
  		
  		invalidDictionaryFiles = new LinkedHashSet<String>();
  		
  		for (String inputFile : inputFiles) {
  
  			List<String> contextFiles = new ArrayList<String>();
  
  			contextFiles.add(inputFile);
  			contextFiles.addAll(supportFiles);
  
  			ClassPathXmlApplicationContext ac;
  			try {
  				log.info("Starting on inputFile: " + inputFile);
  				
  				ac = new ClassPathXmlApplicationContext(
  						contextFiles.toArray(new String[0]));
  			} catch (Exception e) {
 				log.warn ("FAILED to valildate file: " + inputFile, e);
 				
 				Throwable cause = e.getCause();
 				if (cause != null && cause instanceof FileNotFoundException) {
 					missingDictionaryFiles.add(inputFile);
 				}
 				else {
 					// In this case we should create a place holder page 
 					writePlaceholderPage(inputFile, cause);
 					invalidDictionaryFiles.add(inputFile);
 				}
 				continue; // skip over this file.
 			}
 
 			ArrayList<String> associatedBeanNameList  = new ArrayList<String>();
 			
 			Map<String, DataObjectEntry> beansOfType = ac
 					.getBeansOfType(DataObjectEntry.class);
 
 			for (String beanId : beansOfType.keySet()) {
 				
 				try {
 				DataObjectEntry doe = beansOfType.get(beanId);
 				if ("org.kuali.rice.krad.bo.AttributeReferenceDummy".equals(doe
 						.getFullClassName())) {
 					continue;
 				}
 				
 				associatedBeanNameList.add(beanId);
 				
 				log.info("Processing data object entry: "
 						+ doe.getDataObjectClass().getName());
 				DictionaryValidator validator = new DictionaryValidator(doe,
 						new HashSet<DataObjectEntry>());
 				List<String> errors = validator.validate();
 				if (errors != null) {
 					if (!errors.isEmpty()) {
 						throw new IllegalArgumentException(
 								"Errors validating bean " + beanId + "\n"
 										+ this.formatAsString(errors));
 					}
 				}
 				String outputFileName = beanId + ".html";
 				String fullOutputFileName = this.outputDir + "/"
 						+ outputFileName;
 				DictionaryFormatter formatter = new DictionaryFormatter(doe,
 						beansOfType, beanId, fullOutputFileName);
 				
 					formatter.formatForHtml(projectVersion, formattedDate);
 					
 					
 				} catch (Exception e) {
 					
 					log.warn("FAILED to format dictionary page for: " + beanId, e);
 					invalidDictionaryFiles.add(inputFile);
 					continue;
 				}
 				
 			}
 			
 			if (associatedBeanNameList.size() > 0) {
 				inputFileToBeanNameMap.put(inputFile, associatedBeanNameList);
 			}
 			
 			log.info("Finished processing inputFile: " + inputFile);
 		}
 	}
 
 	/*
 	 * In some cases like where spring fails to parse the input file we will want to write a place holder with the cause.
 	 * 
 	 */
 	private void writePlaceholderPage(String inputFile, Throwable cause) {
 		
 		String[] parts = inputFile.split ("-");
 		
 		String beanId = parts[1];
 		
 			String outputFileName = beanId + ".html";
 			String fullOutputFileName = this.outputDir + "/"
 					+ outputFileName;
 		
 			try {
 				FileUtils.writeStringToFile(new File (fullOutputFileName), "<html><body><h1>Failed To Generate Page due to Error in Dictionary File: "+inputFile+"</h1>" +ExceptionUtils.getFullStackTrace(cause) + "</body></html>", false);
 			} catch (IOException e) {
 				log.warn("failed to write placeholder page: " + inputFile, e);
 		}
 	}
 
 	private String formatAsString(List<String> errors) {
 		int i = 0;
 		StringBuilder builder = new StringBuilder();
 		for (String error : errors) {
 			i++;
 			builder.append(i).append(". ").append(error).append("\n");
 		}
 		return builder.toString();
 	}
 
 	/**
 	 * @return the inputFileToBeanNameMap
 	 */
 	public Map<String, List<String>> getInputFileToBeanNameMap() {
 		return inputFileToBeanNameMap;
 	}
 
 	/**
 	 * @return the missingDictionaryFiles
 	 */
 	public Set<String> getMissingDictionaryFiles() {
 		return missingDictionaryFiles;
 	}
 
 	/**
 	 * @return the invalidDictionaryFiles
 	 */
 	public Set<String> getInvalidDictionaryFiles() {
 		return invalidDictionaryFiles;
 	}
 	
 	
 	
 }