/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
    *
    * This program and the accompanying materials are dual-licensed under
    * either the terms of the Eclipse Public License v1.0 as published by
    * the Eclipse Foundation
    *
    *   or (per the licensee's choosing)
   *
   * under the terms of the GNU Lesser General Public License version 2.1
   * as published by the Free Software Foundation.
   */
  package ch.qos.logback.core.rolling.helper;
  
  import java.time.Instant;
  import java.util.Date;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.function.Supplier;
  
  import ch.qos.logback.core.Context;
  import ch.qos.logback.core.pattern.Converter;
  import ch.qos.logback.core.pattern.ConverterUtil;
  import ch.qos.logback.core.pattern.DynamicConverter;
  import ch.qos.logback.core.pattern.LiteralConverter;
  import ch.qos.logback.core.pattern.parser.Node;
  import ch.qos.logback.core.pattern.parser.Parser;
  import ch.qos.logback.core.spi.ScanException;
  import ch.qos.logback.core.pattern.util.AlmostAsIsEscapeUtil;
  import ch.qos.logback.core.spi.ContextAwareBase;
  
  /**
   * After parsing file name patterns, given a number or a date, instances of this
   * class can be used to compute a file name according to the file name pattern
   * and the current date or integer.
   * 
   * @author Ceki Gülcü
   * 
   */
  public class FileNamePattern extends ContextAwareBase {
  
      static final Map<String, Supplier<DynamicConverter>> CONVERTER_MAP = new HashMap<>();
      static {
          CONVERTER_MAP.put(IntegerTokenConverter.CONVERTER_KEY, IntegerTokenConverter::new);
          CONVERTER_MAP.put(DateTokenConverter.CONVERTER_KEY, DateTokenConverter::new);
      }
  
      String pattern;
      Converter<Object> headTokenConverter;
  
      public FileNamePattern(String patternArg, Context contextArg) {
          // the pattern is slashified
          setPattern(FileFilterUtil.slashify(patternArg));
          setContext(contextArg);
          parse();
          ConverterUtil.startConverters(this.headTokenConverter);
      }
  
      void parse() {
          try {
              // http://jira.qos.ch/browse/LOGBACK-197
              // we escape ')' for parsing purposes. Note that the original pattern is
              // preserved
              // because it is shown to the user in status messages. We don't want the escaped
              // version
              // to leak out.
              String patternForParsing = escapeRightParantesis(pattern);
              Parser<Object> p = new Parser<Object>(patternForParsing, new AlmostAsIsEscapeUtil());
              p.setContext(context);
              Node t = p.parse();
              this.headTokenConverter = p.compile(t, CONVERTER_MAP);
  
          } catch (ScanException sce) {
              addError("Failed to parse pattern \"" + pattern + "\".", sce);
          }
      }
  
      String escapeRightParantesis(String in) {
          return pattern.replace(")", "\\)");
      }
  
      public String toString() {
          return pattern;
      }
  
      @Override
      public int hashCode() {
          final int prime = 31;
          int result = 1;
          result = prime * result + ((pattern == null) ? 0 : pattern.hashCode());
          return result;
      }
  
      @Override
      public boolean equals(Object obj) {
          if (this == obj)
              return true;
          if (obj == null)
             return false;
         if (getClass() != obj.getClass())
             return false;
         FileNamePattern other = (FileNamePattern) obj;
         if (pattern == null) {
             if (other.pattern != null)
                 return false;
         } else if (!pattern.equals(other.pattern))
             return false;
         return true;
     }
 
     public DateTokenConverter<Object> getPrimaryDateTokenConverter() {
         Converter<Object> p = headTokenConverter;
 
         while (p != null) {
             if (p instanceof DateTokenConverter) {
                 DateTokenConverter<Object> dtc = (DateTokenConverter<Object>) p;
                 // only primary converters should be returned as
                 if (dtc.isPrimary())
                     return dtc;
             }
 
             p = p.getNext();
         }
 
         return null;
     }
 
     public IntegerTokenConverter getIntegerTokenConverter() {
         Converter<Object> p = headTokenConverter;
 
         while (p != null) {
             if (p instanceof IntegerTokenConverter) {
                 return (IntegerTokenConverter) p;
             }
 
             p = p.getNext();
         }
         return null;
     }
 
     public boolean hasIntegerTokenCOnverter() {
         IntegerTokenConverter itc = getIntegerTokenConverter();
         return itc != null;
     }
 
     public String convertMultipleArguments(Object... objectList) {
         StringBuilder buf = new StringBuilder();
         Converter<Object> c = headTokenConverter;
         while (c != null) {
             if (c instanceof MonoTypedConverter) {
                 MonoTypedConverter monoTyped = (MonoTypedConverter) c;
                 for (Object o : objectList) {
                     if (monoTyped.isApplicable(o)) {
                         buf.append(c.convert(o));
                     }
                 }
             } else {
                 buf.append(c.convert(objectList));
             }
             c = c.getNext();
         }
         return buf.toString();
     }
 
     public String convert(Object o) {
         StringBuilder buf = new StringBuilder();
         Converter<Object> p = headTokenConverter;
         while (p != null) {
             buf.append(p.convert(o));
             p = p.getNext();
         }
         return buf.toString();
     }
 
     public String convertInt(int i) {
         return convert(i);
     }
 
     public void setPattern(String pattern) {
         if (pattern != null) {
             // Trailing spaces in the pattern are assumed to be undesired.
             this.pattern = pattern.trim();
         }
     }
 
     public String getPattern() {
         return pattern;
     }
 
     /**
      * Given date, convert this instance to a regular expression.
      *
      * Used to compute sub-regex when the pattern has both %d and %i, and the date
      * is known.
      * 
      * @param date - known date
      */
     public String toRegexForFixedDate(Date date) {
         StringBuilder buf = new StringBuilder();
         Converter<Object> p = headTokenConverter;
         while (p != null) {
             if (p instanceof LiteralConverter) {
                 buf.append(p.convert(null));
             } else if (p instanceof IntegerTokenConverter) {
                 buf.append("(\\d+)");
             } else if (p instanceof DateTokenConverter) {
                 buf.append(p.convert(date));
             }
             p = p.getNext();
         }
         return buf.toString();
     }
 
 
     /**
      * Given date, convert this instance to a regular expression.
      *
      * Used to compute sub-regex when the pattern has both %d and %i, and the date
      * is known.
      *
      * @param instant - known instant
      */
     public String toRegexForFixedDate(Instant instant) {
         StringBuilder buf = new StringBuilder();
         Converter<Object> p = headTokenConverter;
         while (p != null) {
             if (p instanceof LiteralConverter) {
                 buf.append(p.convert(null));
             } else if (p instanceof IntegerTokenConverter) {
                 buf.append("(\\d+)");
             } else if (p instanceof DateTokenConverter) {
                 buf.append(p.convert(instant));
             }
             p = p.getNext();
         }
         return buf.toString();
     }
 
 
     /**
      * Given date, convert this instance to a regular expression
      */
     public String toRegex() {
         StringBuilder buf = new StringBuilder();
         Converter<Object> p = headTokenConverter;
         while (p != null) {
             if (p instanceof LiteralConverter) {
                 buf.append(p.convert(null));
             } else if (p instanceof IntegerTokenConverter) {
                 buf.append("\\d+");
             } else if (p instanceof DateTokenConverter) {
                 DateTokenConverter<Object> dtc = (DateTokenConverter<Object>) p;
                 buf.append(dtc.toRegex());
             }
             p = p.getNext();
         }
         return buf.toString();
     }
 }