/*
 * Copyright (C) 2011 ZXing authors
 *
 * 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.google.zxing.client.android.encode;

import java.util.List;
import java.util.regex.Pattern;

/**
 * Encodes contact information according to the MECARD format.
 *
 * @author Sean Owen
 */
final class MECARDContactEncoder extends ContactEncoder {

  private static final char TERMINATOR = ';';

  @Override
  public String[] encode(List<String> names,
                         String organization,
                         List<String> addresses,
                         List<String> phones,
                         List<String> phoneTypes,
                         List<String> emails,
                         List<String> urls,
                         String note) {
    StringBuilder newContents = new StringBuilder(100);
    newContents.append("MECARD:");

    StringBuilder newDisplayContents = new StringBuilder(100);

    Formatter fieldFormatter = new MECARDFieldFormatter();

    appendUpToUnique(newContents, newDisplayContents, "N", names, 1, new
                     MECARDNameDisplayFormatter(), fieldFormatter, TERMINATOR);

    append(newContents, newDisplayContents, "ORG", organization, fieldFormatter, TERMINATOR);

    appendUpToUnique(newContents, newDisplayContents, "ADR", addresses, 1, null, fieldFormatter, TERMINATOR);

    appendUpToUnique(newContents, newDisplayContents, "TEL", phones, Integer.MAX_VALUE,
                     new MECARDTelDisplayFormatter(), fieldFormatter, TERMINATOR);

    appendUpToUnique(newContents, newDisplayContents, "EMAIL", emails, Integer.MAX_VALUE, null,
                     fieldFormatter, TERMINATOR);

    appendUpToUnique(newContents, newDisplayContents, "URL", urls, Integer.MAX_VALUE, null,
                     fieldFormatter, TERMINATOR);

    append(newContents, newDisplayContents, "NOTE", note, fieldFormatter, TERMINATOR);

    newContents.append(';');

    return new String[] { newContents.toString(), newDisplayContents.toString() };
  }

  private static final class MECARDFieldFormatter implements Formatter {
    private static final Pattern RESERVED_MECARD_CHARS = Pattern.compile("([\\\\:;])");
    private static final Pattern NEWLINE = Pattern.compile("\\n");
    @Override
    public CharSequence format(CharSequence value, int index) {
      return ':' + NEWLINE.matcher(RESERVED_MECARD_CHARS.matcher(value).replaceAll("\\\\$1")).replaceAll("");
    }
  }

  private static final class MECARDTelDisplayFormatter implements Formatter {
    private static final Pattern NOT_DIGITS_OR_PLUS = Pattern.compile("[^0-9+]+");
    @Override
    public CharSequence format(CharSequence value, int index) {
      return NOT_DIGITS_OR_PLUS.matcher(ContactEncoder.formatPhone(value.toString())).replaceAll("");
    }
  }

  private static final class MECARDNameDisplayFormatter implements Formatter {
    private static final Pattern COMMA = Pattern.compile(",");
    @Override
    public CharSequence format(CharSequence value, int index) {
      return COMMA.matcher(value).replaceAll("");
    }
  }

}
