/*
    * Licensed to the Apache Software Foundation (ASF) under one   *
    * or more contributor license agreements.  See the NOTICE file *
    * distributed with this work for additional information        *
    * regarding copyright ownership.  The ASF licenses this file   *
    * to you under the Apache 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.apache.org/licenses/LICENSE-2.0                 *
   *                                                              *
   * 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.apache.rat;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.FilenameFilter;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.io.OutputStreamWriter;
  import java.io.PrintWriter;
  import java.net.MalformedURLException;
  import java.net.URI;
  import java.net.URL;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.Files;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Objects;
  import java.util.SortedSet;
  import java.util.TreeSet;
  import java.util.function.Consumer;
  
  import org.apache.commons.io.filefilter.FalseFileFilter;
  import org.apache.commons.io.filefilter.IOFileFilter;
  import org.apache.commons.io.function.IOSupplier;
  import org.apache.rat.config.AddLicenseHeaders;
  import org.apache.rat.license.ILicense;
  import org.apache.rat.license.ILicenseFamily;
  import org.apache.rat.license.LicenseFamilySetFactory;
  import org.apache.rat.license.LicenseSetFactory;
  import org.apache.rat.license.LicenseSetFactory.LicenseFilter;
  import org.apache.rat.report.IReportable;
  import org.apache.rat.utils.Log;
  import org.apache.rat.utils.ReportingSet;
  import org.apache.rat.walker.NameBasedHiddenFileFilter;
  
  /**
   * A configuration object is used by the front end to invoke the
   * {@link Reporter}. The sole purpose of the front ends is to create the
   * configuration and invoke the {@link Reporter}.
   */
  public class ReportConfiguration {
      private final ReportingSet<ILicenseFamily> families;
      private final ReportingSet<ILicense> licenses;
      private final SortedSet<String> approvedLicenseCategories;
      private final SortedSet<String> removedLicenseCategories;
      private boolean addingLicenses;
      private boolean addingLicensesForced;
      private String copyrightMessage;
      private IOSupplier<OutputStream> out;
      private boolean styleReport;
      private IOSupplier<InputStream> styleSheet;
      private IReportable reportable;
      private FilenameFilter inputFileFilter;
      private IOFileFilter directoryFilter;
      private Log log;
  
     
      /**
       * Constructor
       * @param log The Log implementation that messages will be written to.
       */
      public ReportConfiguration(Log log) {
          this.log = log;
          families = new ReportingSet<>(LicenseFamilySetFactory.emptyLicenseFamilySet()).setLog(log)
                  .setMsgFormat( s -> String.format("Duplicate LicenseFamily category: %s",  s.getFamilyCategory()));
          licenses = new ReportingSet<>(LicenseSetFactory.emptyLicenseSet()).setLog(log)
                  .setMsgFormat( s -> String.format( "Duplicate License %s (%s) of type %s", s.getName(), s.getId(), s.getLicenseFamily().getFamilyCategory()));
          approvedLicenseCategories = new TreeSet<>();
          removedLicenseCategories = new TreeSet<>();
          directoryFilter = NameBasedHiddenFileFilter.HIDDEN;
          styleReport = true;
      }
      
      /**
       * Retrieves the Log that was provided in the constructor.
       * @return the Log for the system.
       */
      public Log getLog() {
          return log;
      }
     /**
      * Set the log level for reporting collisions in the set of license families.
      * <p>NOTE: should be set before licenses or license families are added.</p>
      * @param level The log level to use.
      */
     public void logFamilyCollisions(Log.Level level) {
         families.setLogLevel(level);
     }
     
     /**
      * Sets the reporting option for duplicate license families.
      * @param state The ReportingSet.Option to use for reporting.
      */
     public void familyDuplicateOption(ReportingSet.Options state) {
         families.setDuplicateOption(state);
     }
 
     /**
      * Sets the log level for reporting license collisions.
      * @param level The log level.
      */
     public void logLicenseCollisions(Log.Level level) {
         licenses.setLogLevel(level);
     }
     
     /**
      * Sets the reporting option for duplicate licenses.
      * @param state the ReportingSt.Option to use for reporting.
      */
     public void licenseDuplicateOption(ReportingSet.Options state) {
         licenses.setDuplicateOption(state);
     }
     
     /**
      * @return The filename filter for the potential input files.
      */
     public FilenameFilter getInputFileFilter() {
         return inputFileFilter;
     }
 
     /**
      * @param inputFileFilter the filename filter to filter the input files.
      */
     public void setInputFileFilter(FilenameFilter inputFileFilter) {
         this.inputFileFilter = inputFileFilter;
     }
 
     public IOFileFilter getDirectoryFilter() {
         return directoryFilter;
     }
 
     public void setDirectoryFilter(IOFileFilter directoryFilter) {
         if (directoryFilter == null) {
             this.directoryFilter = FalseFileFilter.FALSE;
         } else {
             this.directoryFilter = directoryFilter;
         }
     }
 
     public void addDirectoryFilter(IOFileFilter directoryFilter) {
         this.directoryFilter = this.directoryFilter.and(directoryFilter);
     }
 
     /**
      * @return the thing being reported on.
      */
     public IReportable getReportable() {
         return reportable;
     }
 
     /**
      * @param reportable the thing being reported on.
      */
     public void setReportable(IReportable reportable) {
         this.reportable = reportable;
     }
 
     /**
      * @return the Supplier of the InputStream that is the XSLT style sheet to style
      * the report with.
      */
     public IOSupplier<InputStream> getStyleSheet() {
         return styleSheet;
     }
 
     /**
      * Sets the style sheet for custom processing. The IOSupplier may be called
      * multiple times, so the input stream must be able to be opened and closed
      * multiple times.
      * 
      * @param styleSheet the XSLT style sheet to style the report with.
      */
     public void setStyleSheet(IOSupplier<InputStream> styleSheet) {
         this.styleSheet = styleSheet;
     }
 
     /**
      * Adds the licenses and approved licenses from the defaults object to the
      * configuration. <em>Side effect: </em> if the report should be styled and no
      * style sheet has been set the plain stylesheet from the defaults will be used.
      * 
      * @param defaults The defaults to set.
      */
     public void setFrom(Defaults defaults) {
         addLicensesIfNotPresent(defaults.getLicenses(LicenseFilter.all));
         addApprovedLicenseCategories(defaults.getLicenseIds(LicenseFilter.approved));
         if (isStyleReport() && getStyleSheet() == null) {
             setStyleSheet(Defaults.getPlainStyleSheet());
         }
     }
 
     /**
      * 
      * @param styleSheet the XSLT style sheet to style the report with.
      */
     public void setStyleSheet(File styleSheet) {
         Objects.requireNonNull(styleSheet, "styleSheet file should not be null");
         setStyleSheet(styleSheet.toURI());
     }
 
     /**
      * Sets the style sheet for custom processing. The stylesheet may be opened
      * multiple times so the URI must be capable of being opened multiple times.
      * 
      * @param styleSheet the URI of the XSLT style sheet to style the report with.
      */
     public void setStyleSheet(URI styleSheet) {
         Objects.requireNonNull(styleSheet, "styleSheet file should not be null");
         try {
             setStyleSheet(styleSheet.toURL());
         } catch (MalformedURLException e) {
             throw new ConfigurationException("Unable to process stylesheet", e);
         }
     }
 
     /**
      * Sets the style sheet for custom processing. The stylesheet may be opened
      * multiple times so the URL must be capable of being opened multiple times.
      * 
      * @param styleSheet the URL of the XSLT style sheet to style the report with.
      */
     public void setStyleSheet(URL styleSheet) {
         Objects.requireNonNull(styleSheet, "styleSheet file should not be null");
         setStyleSheet(styleSheet::openStream);
     }
 
     /**
      * @return {@code true} if the XML report should be styled.
      */
     public boolean isStyleReport() {
         return styleReport;
     }
 
     /**
      * @param styleReport specifies whether the XML report should be styled.
      */
     public void setStyleReport(boolean styleReport) {
         this.styleReport = styleReport;
     }
 
     /**
      * Sets the supplier for the output stream. The supplier may be called multiple
      * times to provide the stream. Suppliers should prepare streams that are
      * appended to and that can be closed. If an {@code OutputStream} should not be
      * closed consider wrapping it in a {@code NoCloseOutputStream}
      * 
      * @param out The OutputStream supplier that provides the output stream to write
      * the report to. A null value will use System.out.
      * @see NoCloseOutputStream
      */
     public void setOut(IOSupplier<OutputStream> out) {
         this.out = out;
     }
 
     /**
      * Sets the OutputStream supplier to use the specified file. The file may be
      * opened and closed several times. File is deleted first and then may be
      * repeatedly opened in append mode.
      * 
      * @see #setOut(IOSupplier)
      * @param file The file to create the supplier with.
      */
     public void setOut(File file) {
         Objects.requireNonNull(file, "output file should not be null");
         if (file.exists()) {
             try {
                 Files.delete(file.toPath());
             } catch (IOException e) {
                 log.warn("Unable to delete file:"+file);
             }
         }
         setOut(() -> new FileOutputStream(file, true));
     }
 
     /**
      * Returns the output stream supplier. If no stream has been set returns a
      * supplier for System.out.
      * 
      * @return The supplier of the output stream to write the report to.
      */
     public IOSupplier<OutputStream> getOutput() {
         return out == null ? () -> new NoCloseOutputStream(System.out) : out;
     }
 
     /**
      * @return A supplier for a PrintWriter that wraps the output stream.
      * @see #getOutput()
      */
     public IOSupplier<PrintWriter> getWriter() {
         return () -> new PrintWriter(new OutputStreamWriter(getOutput().get(), StandardCharsets.UTF_8));
     }
 
     /**
      * Adds a license to the list of licenses. Does not add the license to the list
      * of approved licenses.
      * 
      * @param license The license to add to the list of licenses.
      */
     public void addLicense(ILicense license) {
         if (license != null) {
             this.licenses.add(license);
             this.families.addIfNotPresent(license.getLicenseFamily());
         }
     }
 
     /**
      * Adds a license to the list of licenses. Does not add the license to the list
      * of approved licenses.
      * 
      * @param builder The license builder to build and add to the list of licenses.
      */
     public ILicense addLicense(ILicense.Builder builder) {
         if (builder != null) {
             ILicense license = builder.build(families);
             this.licenses.add(license);
             return license;
         }
         return null;
     }
 
     /**
      * Adds multiple licenses to the list of licenses. Does not add the licenses to
      * the list of approved licenses.
      *
      * @param licenses The licenses to add.
      */
     public void addLicenses(Collection<ILicense> licenses) {
         this.licenses.addAll(licenses);
         licenses.stream().map(ILicense::getLicenseFamily).forEach(families::add);
     }
 
     /**
      * Adds multiple licenses to the list of licenses. Does not add the licenses to
      * the list of approved licenses.
      *
      * @param licenses The licenses to add.
      */
     public void addLicensesIfNotPresent(Collection<ILicense> licenses) {
         this.licenses.addAllIfNotPresent(licenses);
         licenses.stream().map(ILicense::getLicenseFamily).forEach(families::addIfNotPresent);
     }
     
     /**
      * Adds a license family to the list of families. Does not add the family to the
      * list of approved licenses.
      * 
      * @param family The license family to add to the list of license families.
      */
     public void addFamily(ILicenseFamily family) {
         if (family != null) {
             this.families.add(family);
         }
     }
 
     /**
      * Adds a license family to the list of families. Does not add the family to the
      * list of approved licenses.
      * 
      * @param builder The licenseFamily.Builder to build and add to the list of
      * licenses.
      */
     public void addFamily(ILicenseFamily.Builder builder) {
         if (builder != null) {
             this.families.add(builder.build());
         }
     }
 
     /**
      * Adds multiple families to the list of license families. Does not add the
      * licenses to the list of approved licenses.
      *
      * @param families The license families to add.
      */
     public void addFamilies(Collection<ILicenseFamily> families) {
         this.families.addAll(families);
     }
 
     /**
      * Adds an ILicenseFamily to the list of approved licenses.
      *
      * @param approvedILicenseFamily the LicenseFamily to add.
      */
     public void addApprovedLicenseCategory(ILicenseFamily approvedILicenseFamily) {
         approvedLicenseCategories.add(approvedILicenseFamily.getFamilyCategory());
     }
 
     /**
      * Adds a license family category (id) to the list of approved licenses
      * 
      * @param familyCategory the category to add.
      */
     public void addApprovedLicenseCategory(String familyCategory) {
         approvedLicenseCategories.add(ILicenseFamily.makeCategory(familyCategory));
     }
 
     /**
      * Adds a collection of license family categories to the set of approved license
      * names.
      *
      * @param approvedLicenseCategories set of approved license categories.
      */
     public void addApprovedLicenseCategories(Collection<String> approvedLicenseCategories) {
         approvedLicenseCategories.forEach(this::addApprovedLicenseCategory);
     }
 
     /**
      * Adds a license family category to the list of approved licenses. <em>Once a
      * license has been removed from the approved list it cannot be re-added</em>
      * 
      * @param familyCategory the category to add.
      */
     public void removeApprovedLicenseCategory(String familyCategory) {
         removedLicenseCategories.add(ILicenseFamily.makeCategory(familyCategory));
     }
 
     /**
      * Removes a license family category from the list of approved licenses.
      * <em>Once a license has been removed from the approved list it cannot be
      * re-added</em>
      * 
      * @param familyCategory the family category to remove.
      */
     public void removeApprovedLicenseCategories(Collection<String> familyCategory) {
         familyCategory.forEach(this::removeApprovedLicenseCategory);
     }
 
     /**
      * Gets the SortedSet of approved license categories. <em>Once a license has
      * been removed from the approved list it cannot be re-added</em>
      * 
      * @return the Sorted set of approved license categories.
      */
     public SortedSet<String> getApprovedLicenseCategories() {
         SortedSet<String> result = new TreeSet<>(approvedLicenseCategories);
         result.removeAll(removedLicenseCategories);
         return result;
     }
 
     /**
      * Returns the optional license copyright being added if RAT is adding headers.
      * This value is ignored, if no license headers are added.
      * 
      * @return the optional copyright message.
      * @see #isAddingLicenses()
      */
     public String getCopyrightMessage() {
         return copyrightMessage;
     }
 
     /**
      * Sets the optional copyright message used if RAT is adding license headers.
      * This value is ignored, if no license headers are added.
      *
      * @param copyrightMessage message to set.
      * @see #isAddingLicenses()
      */
     public void setCopyrightMessage(String copyrightMessage) {
         this.copyrightMessage = copyrightMessage;
     }
 
     /**
      * This value is ignored if RAT is not adding licenses.
      * 
      * @return {@code true} if RAT is forcing the adding license headers.
      * @see #isAddingLicenses()
      */
     public boolean isAddingLicensesForced() {
         return addingLicensesForced;
     }
 
     /**
      * @return whether RAT should add missing license headers.
      * @see #isAddingLicensesForced()
      * @see #getCopyrightMessage()
      */
     public boolean isAddingLicenses() {
         return addingLicenses;
     }
 
     /**
      * Sets whether RAT should enable, disable, or force the adding of license
      * headers.
      * 
      * @param addLicenseHeaders enables/disables or forces adding of licenses
      * headers.
      * @see #isAddingLicenses()
      * @see #setCopyrightMessage(String)
      */
     public void setAddLicenseHeaders(AddLicenseHeaders addLicenseHeaders) {
         addingLicenses = false;
         addingLicensesForced = false;
         switch (addLicenseHeaders) {
         case FALSE:
             // do nothing
             break;
         case FORCED:
             addingLicensesForced = true;
             // fall through
         case TRUE:
             addingLicenses = true;
             break;
         }
     }
 
     /**
      * Gets a set Licenses of depending on the {@code filter} if filter is set:
      * <ul>
      * <li>{@code all} - All licenses will be returned.</li>
      * <li>{@code approved} - Only approved licenses will be returned</li>
      * <li>{@code none} - No licenses will be returned</li>
      * </ul>
      * 
      * @param filter The license filter.
      * @return The set of defined licenses.
      */
     public SortedSet<ILicense> getLicenses(LicenseFilter filter) {
         switch (filter) {
         case all:
             return Collections.unmodifiableSortedSet(licenses);
         case approved:
             return new LicenseSetFactory(licenses, getApprovedLicenseCategories()).getLicenses(filter);
         case none:
         default:
             return LicenseSetFactory.emptyLicenseSet();
         }
     }
 
     /**
      * Gets a sorted set of ILicenseFamily objects based on {@code filter}. if
      * filter is set:
      * <ul>
      * <li>{@code all} - All licenses families will be returned.</li>
      * <li>{@code approved} - Only approved license families will be returned</li>
      * <li>{@code none} - No license families will be returned</li>
      * </ul>
      * 
      * @param filter The license filter.
      * @return The set of defined licenses.
      */
     public SortedSet<ILicenseFamily> getLicenseFamilies(LicenseFilter filter) {
         return new LicenseFamilySetFactory(families, getApprovedLicenseCategories()).getFamilies(filter);
     }
 
     /**
      * Validates that the configuration is valid.
      * 
      * @param logger String consumer to log warning messages to.
      */
     public void validate(Consumer<String> logger) {
         if (reportable == null) {
             throw new ConfigurationException("Reportable may not be null");
         }
         if (licenses.isEmpty()) {
             throw new ConfigurationException("You must specify at least one license");
         }
         if (styleSheet != null && !isStyleReport()) {
             logger.accept("Ignoring stylesheet because styling is not selected");
         }
         if (styleSheet == null && isStyleReport()) {
             throw new ConfigurationException("Stylesheet must be specified if report styling is selected");
         }
     }
 
     /**
      * A wrapper around an output stream that does not close the output stream.
      */
     public static class NoCloseOutputStream extends OutputStream {
         private final OutputStream delegate;
 
         public NoCloseOutputStream(OutputStream delegate) {
             this.delegate = delegate;
         }
 
         @Override
         public void write(int arg0) throws IOException {
             delegate.write(arg0);
         }
 
         @Override
         public void close() throws IOException {
             this.delegate.flush();
         }
 
         @Override
         public boolean equals(Object obj) {
             return delegate.equals(obj);
         }
 
         @Override
         public void flush() throws IOException {
             delegate.flush();
         }
 
         @Override
         public int hashCode() {
             return delegate.hashCode();
         }
 
         @Override
         public String toString() {
             return delegate.toString();
         }
 
         @Override
         public void write(byte[] arg0, int arg1, int arg2) throws IOException {
             delegate.write(arg0, arg1, arg2);
         }
 
         @Override
         public void write(byte[] b) throws IOException {
             delegate.write(b);
         }
     }
 }