/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.runtime.config.spring.parsers.specific;

import org.mule.runtime.config.spring.parsers.assembly.configuration.ValueMap;
import org.mule.runtime.core.routing.filters.RegExFilter;
import org.mule.runtime.core.util.StringUtils;

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;

public class RegExFilterDefinitionParser extends FilterDefinitionParser {

  public RegExFilterDefinitionParser() {
    super(RegExFilter.class);
    addMapping("flags", new FlagsMapping());
  }

  /**
   * Map a comma-separated string to an Integer object that can be used to set the flags on a {@link RegExFilter}.
   */
  public static class FlagsMapping implements ValueMap {

    private static final Map<String, Integer> FlagsMapping;

    static {
      FlagsMapping = new HashMap<String, Integer>();
      FlagsMapping.put("CANON_EQ", Integer.valueOf(Pattern.CANON_EQ));
      FlagsMapping.put("CASE_INSENSITIVE", Integer.valueOf(Pattern.CASE_INSENSITIVE));
      FlagsMapping.put("DOTALL", Integer.valueOf(Pattern.DOTALL));
      FlagsMapping.put("MULTILINE", Integer.valueOf(Pattern.MULTILINE));
      FlagsMapping.put("UNICODE_CASE", Integer.valueOf(Pattern.UNICODE_CASE));
    }

    public Object rewrite(String value) {
      int combinedFlags = 0;

      String[] flagStrings = StringUtils.split(value, ',');
      for (String flagString : flagStrings) {
        Integer flag = FlagsMapping.get(flagString);
        if (flag == null) {
          String message = String.format("Invalid flag '%1s'. Must be one of %2s", flagString, FlagsMapping.keySet().toString());
          throw new IllegalArgumentException(message);
        }

        combinedFlags = combinedFlags | flag.intValue();
      }

      return Integer.valueOf(combinedFlags);
    }
  }
}