/*
    * 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.logging.log4j.core.impl;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Scanner;
  
  import org.apache.logging.log4j.core.helpers.Constants;
  
  /**
   * Contains options which control how a {@link Throwable} pattern is formatted.
   */
  public final class ThrowableFormatOptions {
  
      private static final int DEFAULT_LINES = Integer.MAX_VALUE;
  
      /**
       * Default instance of {@code ThrowableFormatOptions}.
       */
      protected static final ThrowableFormatOptions DEFAULT = new ThrowableFormatOptions();
  
      /**
       * Format the whole stack trace.
       */
      private static final String FULL = "full";
  
      /**
       * Do not format the exception.
       */
      private static final String NONE = "none";
  
      /**
       * Format only the first line of the throwable.
       */
      private static final String SHORT = "short";
  
      /**
       * The number of lines to write.
       */
      private final int lines;
  
      /**
       * The stack trace separator.
       */
      private final String separator;
  
      /**
       * The list of packages to filter.
       */
      private final List<String> packages;
  
      public static final String CLASS_NAME = "short.className";
      public static final String METHOD_NAME = "short.methodName";
      public static final String LINE_NUMBER = "short.lineNumber";
      public static final String FILE_NAME = "short.fileName";
      public static final String MESSAGE = "short.message";
      public static final String LOCALIZED_MESSAGE = "short.localizedMessage";
  
      /**
       * Construct the options for printing stack trace.
       * @param lines The number of lines.
       * @param separator The stack trace separator.
       * @param packages The packages to filter.
       */
      protected ThrowableFormatOptions(final int lines, final String separator, final List<String> packages) {
          this.lines = lines;
          this.separator = separator == null ? Constants.LINE_SEP : separator;
          this.packages = packages;
      }
  
      /**
       * Construct the options for printing stack trace.
       * @param packages The packages to filter.
       */
      protected ThrowableFormatOptions(final List<String> packages) {
          this(DEFAULT_LINES, null, packages);
      }
  
      /**
       * Construct the options for printing stack trace.
       */
      protected ThrowableFormatOptions() {
          this(DEFAULT_LINES, null, null);
      }
 
     /**
      * Returns the number of lines to write.
      * @return The number of lines to write.
      */
     public int getLines() {
         return this.lines;
     }
 
     /**
      * Returns the stack trace separator.
      * @return The stack trace separator.
      */
     public String getSeparator() {
         return this.separator;
     }
 
     /**
      * Returns the list of packages to filter.
      * @return The list of packages to filter.
      */
     public List<String> getPackages() {
         return this.packages;
     }
 
     /**
      * Determines if all lines should be printed.
      * @return true for all lines, false otherwise.
      */
     public boolean allLines() {
         return this.lines == DEFAULT_LINES;
     }
 
     /**
      * Determines if any lines should be printed.
      * @return true for any lines, false otherwise.
      */
     public boolean anyLines() {
         return this.lines > 0;
     }
 
     /**
      * Returns the minimum between the lines and the max lines.
      * @param maxLines The maximum number of lines.
      * @return The number of lines to print.
      */
     public int minLines(final int maxLines) {
         return this.lines > maxLines ? maxLines : this.lines;
     }
 
     /**
      * Determines if there are any packages to filter.
      * @return true if there are packages, false otherwise.
      */
     public boolean hasPackages() {
         return this.packages != null && !this.packages.isEmpty();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String toString() {
         final StringBuilder s = new StringBuilder();
         s.append("{").append(allLines() ? FULL : this.lines == 2 ? SHORT : anyLines() ? String.valueOf(this.lines) : NONE).append("}");
         s.append("{separator(").append(this.separator).append(")}");
         if (hasPackages()) {
             s.append("{filters(");
             for (final String p : this.packages) {
                 s.append(p).append(",");
             }
             s.deleteCharAt(s.length() - 1);
             s.append(")}");
         }
         return s.toString();
     }
 
     /**
      * Create a new instance based on the array of options.
      * @param options The array of options.
      */
     public static ThrowableFormatOptions newInstance(String[] options) {
         if (options == null || options.length == 0) {
             return DEFAULT;
         }
         // NOTE: The following code is present for backward compatibility
         // and was copied from Extended/RootThrowablePatternConverter.
         // This supports a single option with the format:
         //     %xEx{["none"|"short"|"full"|depth],[filters(packages)}
         // However, the convention for multiple options should be:
         //     %xEx{["none"|"short"|"full"|depth]}[{filters(packages)}]
         if (options.length == 1 && options[0] != null && options[0].length() > 0) {
             final String[] opts = options[0].split(",", 2);
             final String first = opts[0].trim();
             final Scanner scanner = new Scanner(first);
             if (opts.length > 1 && (first.equalsIgnoreCase(FULL) || first.equalsIgnoreCase(SHORT) || first.equalsIgnoreCase(NONE) || scanner.hasNextInt())) {
                 options = new String[]{first, opts[1].trim()};
             }
             scanner.close();
         }
 
         int lines = DEFAULT.lines;
         String separator = DEFAULT.separator;
         List<String> packages = DEFAULT.packages;
         for (String rawOption : options) {
             if (rawOption != null) {
                 final String option = rawOption.trim();
                 if (option.isEmpty()) {
                     // continue;
                 } else if (option.startsWith("separator(") && option.endsWith(")")) {
                     separator = option.substring("separator(".length(), option.length() - 1);
                 } else if (option.startsWith("filters(") && option.endsWith(")")) {
                     final String filterStr = option.substring("filters(".length(), option.length() - 1);
                     if (filterStr.length() > 0) {
                         final String[] array = filterStr.split(",");
                         if (array.length > 0) {
                             packages = new ArrayList<String>(array.length);
                             for (String token : array) {
                                 token = token.trim();
                                 if (token.length() > 0) {
                                     packages.add(token);
                                 }
                             }
                         }
                     }
                 } else if (option.equalsIgnoreCase(NONE)) {
                     lines = 0;
                 } else if (option.equalsIgnoreCase(SHORT) || option.equalsIgnoreCase(CLASS_NAME) ||
                         option.equalsIgnoreCase(METHOD_NAME) || option.equalsIgnoreCase(LINE_NUMBER) ||
                         option.equalsIgnoreCase(FILE_NAME) || option.equalsIgnoreCase(MESSAGE) || 
                         option.equalsIgnoreCase(LOCALIZED_MESSAGE)) {
                     lines = 2;
                 } else if (!option.equalsIgnoreCase(FULL)) {
                     lines = Integer.parseInt(option);
                 }
             }
         }
         return new ThrowableFormatOptions(lines, separator, packages);
     }
 }