/*
 * Copyright 2011,2012 Metamarkets Group Inc.
 *
 * Licensed 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 com.metamx.common.parsers;

import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Sets;
import com.metamx.common.exception.FormattedException;
import com.metamx.common.exception.SubErrorHolder;
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.DateTimeFormatterBuilder;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ParserUtils
{
  public static final Function<String, String> nullEmptyStringFunction = new Function<String, String>()
  {
    @Override
    public String apply(String input)
    {
      if (input == null || input.isEmpty()) {
        return null;
      }
      return input;
    }
  };

  public static ArrayList<String> generateFieldNames(int length)
  {
    ArrayList<String> names = new ArrayList<String>(length);
    for (int i = 0; i < length; ++i) {
      names.add("column_" + (i + 1));
    }
    return names;
  }

  /**
   * Factored timestamp parsing into its own Parser class, but leaving this here
   * for compatibility
   * @param format
   * @return
   */
  public static Function<String, DateTime> createTimestampParser(final String format) {
    return TimestampParser.createTimestampParser(format);
  }

  private static Set<String> findDuplicates(Iterable<String> fieldNames)
  {
    Set<String> duplicates = Sets.newHashSet();
    Set<String> uniqueNames = Sets.newHashSet();
    Iterator<String> iter = fieldNames.iterator();

    while (iter.hasNext()) {
      String next = iter.next().toLowerCase();
      if (uniqueNames.contains(next)) {
        duplicates.add(next);
      }
      uniqueNames.add(next);
    }

    return duplicates;
  }

  public static char getMalformedChar(String str)
  {
    for (int i = 0; i < str.length(); i++) {
      char c = str.charAt(i);
      if (c == 47 || c < 32 || c > 126) {
        return c;
      }
    }
    return 0;
  }

  public static void validateFields(Iterable<String> fieldNames) throws FormattedException
  {
    Set<String> duplicates = findDuplicates(fieldNames);
    if (!duplicates.isEmpty()) {
      throw new FormattedException.Builder()
          .withErrorCode(FormattedException.ErrorCode.UNPARSABLE_HEADER)
          .withDetails(
              new SubErrorHolder(
                  FormattedException.SubErrorCode.DUPLICATE_KEY,
                  fieldNames,
                  duplicates
              ).get()
          )
          .withMessage(String.format("Duplicate entries founds: %s", duplicates.toString()))
          .build();
    }


    Iterator<String> iter = fieldNames.iterator();
    while (iter.hasNext()) {
      String next = iter.next().toLowerCase();
      char malformed = getMalformedChar(next);
      if(malformed != 0) {
        throw new FormattedException.Builder()
            .withErrorCode(FormattedException.ErrorCode.UNPARSABLE_HEADER)
            .withDetails(
                new SubErrorHolder(
                    FormattedException.SubErrorCode.INVALID_CHARACTER,
                    next,
                    malformed
                ).get()
            )
            .withMessage(String.format("Header columns contains invalid char[%c]", malformed))
            .build();
      }
    }
  }



}

@@ -2798,230 +2798,8 @@
  %7D%0A%0A
-  public static char getMalformedChar(String str)%0A  %7B%0A    for (int i = 0; i %3C str.length(); i++) %7B%0A      char c = str.charAt(i);%0A      if (c == 47 %7C%7C c %3C 32 %7C%7C c %3E 126) %7B%0A        return c;%0A      %7D%0A    %7D%0A    return 0;%0A  %7D%0A%0A
   pu
@@ -2885,16 +2885,16 @@
 ception%0A
+
   %7B%0A    
@@ -3436,696 +3436,10 @@
   %7D%0A
-%0A%0A    Iterator%3CString%3E iter = fieldNames.iterator();%0A    while (iter.hasNext()) %7B%0A      String next = iter.next().toLowerCase();%0A      char malformed = getMalformedChar(next);%0A      if(malformed != 0) %7B%0A        throw new FormattedException.Builder()%0A            .withErrorCode(FormattedException.ErrorCode.UNPARSABLE_HEADER)%0A            .withDetails(%0A                new SubErrorHolder(%0A                    FormattedException.SubErrorCode.INVALID_CHARACTER,%0A                    next,%0A                    malformed%0A                ).get()%0A            )%0A            .withMessage(String.format(%22Header columns contains invalid char%5B%25c%5D%22, malformed))%0A            .build();%0A      %7D%0A    %7D%0A  %7D%0A%0A%0A
+  %7D
 %0A%7D%0A

move malformed character check back into byob since java util is a public repo