import parseDigits from '../helpers/parseDigits.js';
import matchPhoneNumberStringAgainstPhoneNumber from './matchPhoneNumberStringAgainstPhoneNumber.js';
import Metadata from '../metadata.js';
import getCountryByCallingCode from '../helpers/getCountryByCallingCode.js';
import { chooseFormatForNumber } from '../format.js';
import { startsWith, endsWith } from './util.js';

/**
 * Leniency when finding potential phone numbers in text segments
 * The levels here are ordered in increasing strictness.
 */
export default {
  /**
   * Phone numbers accepted are "possible", but not necessarily "valid".
   */
  POSSIBLE(phoneNumber, {
    candidate,
    metadata
  }) {
    return true;
  },
  /**
   * Phone numbers accepted are "possible" and "valid".
   * Numbers written in national format must have their national-prefix
   * present if it is usually written for a number of this type.
   */
  VALID(phoneNumber, {
    candidate,
    defaultCountry,
    metadata
  }) {
    if (!phoneNumber.isValid() || !containsOnlyValidXChars(phoneNumber, candidate, metadata)) {
      return false;
    }

    // Skipped for simplicity.
    // return isNationalPrefixPresentIfRequired(phoneNumber, { defaultCountry, metadata })
    return true;
  },
  /**
   * Phone numbers accepted are "valid" and
   * are grouped in a possible way for this locale. For example, a US number written as
   * "65 02 53 00 00" and "650253 0000" are not accepted at this leniency level, whereas
   * "650 253 0000", "650 2530000" or "6502530000" are.
   * Numbers with more than one '/' symbol in the national significant number
   * are also dropped at this level.
   *
   * Warning: This level might result in lower coverage especially for regions outside of
   * country code "+1". If you are not sure about which level to use,
   * email the discussion group libphonenumber-discuss@googlegroups.com.
   */
  STRICT_GROUPING(phoneNumber, {
    candidate,
    defaultCountry,
    metadata,
    regExpCache
  }) {
    if (!phoneNumber.isValid() || !containsOnlyValidXChars(phoneNumber, candidate, metadata) || containsMoreThanOneSlashInNationalNumber(phoneNumber, candidate) || !isNationalPrefixPresentIfRequired(phoneNumber, {
      defaultCountry,
      metadata
    })) {
      return false;
    }
    return checkNumberGroupingIsValid(phoneNumber, candidate, metadata, allNumberGroupsRemainGrouped, regExpCache);
  },
  /**
   * Phone numbers accepted are "valid" and are grouped in the same way
   * that we would have formatted it, or as a single block.
   * For example, a US number written as "650 2530000" is not accepted
   * at this leniency level, whereas "650 253 0000" or "6502530000" are.
   * Numbers with more than one '/' symbol are also dropped at this level.
   *
   * Warning: This level might result in lower coverage especially for regions outside of
   * country code "+1". If you are not sure about which level to use, email the discussion group
   * libphonenumber-discuss@googlegroups.com.
   */
  EXACT_GROUPING(phoneNumber, {
    candidate,
    defaultCountry,
    metadata,
    regExpCache
  }) {
    if (!phoneNumber.isValid() || !containsOnlyValidXChars(phoneNumber, candidate, metadata) || containsMoreThanOneSlashInNationalNumber(phoneNumber, candidate) || !isNationalPrefixPresentIfRequired(phoneNumber, {
      defaultCountry,
      metadata
    })) {
      return false;
    }
    return checkNumberGroupingIsValid(phoneNumber, candidate, metadata, allNumberGroupsAreExactlyPresent, regExpCache);
  }
};
function containsOnlyValidXChars(phoneNumber, candidate, metadata) {
  // The characters 'x' and 'X' can be (1) a carrier code, in which case they always precede the
  // national significant number or (2) an extension sign, in which case they always precede the
  // extension number. We assume a carrier code is more than 1 digit, so the first case has to
  // have more than 1 consecutive 'x' or 'X', whereas the second case can only have exactly 1 'x'
  // or 'X'. We ignore the character if it appears as the last character of the string.
  for (let index = 0; index < candidate.length - 1; index++) {
    const charAtIndex = candidate.charAt(index);
    if (charAtIndex === 'x' || charAtIndex === 'X') {
      const charAtNextIndex = candidate.charAt(index + 1);
      if (charAtNextIndex === 'x' || charAtNextIndex === 'X') {
        // This is the carrier code case, in which the 'X's always precede the national
        // significant number.
        index++;
        if (matchPhoneNumberStringAgainstPhoneNumber(candidate.substring(index), phoneNumber, metadata) !== 'NSN_MATCH') {
          return false;
        }
        // This is the extension sign case, in which the 'x' or 'X' should always precede the
        // extension number.
      } else {
        const ext = parseDigits(candidate.substring(index));
        if (ext) {
          if (phoneNumber.ext !== ext) {
            return false;
          }
        } else {
          if (phoneNumber.ext) {
            return false;
          }
        }
      }
    }
  }
  return true;
}
function isNationalPrefixPresentIfRequired(phoneNumber, {
  defaultCountry,
  metadata: _metadata
}) {
  // First, check how we deduced the country code. If it was written in international format, then
  // the national prefix is not required.
  if (phoneNumber.__countryCallingCodeSource !== 'FROM_DEFAULT_COUNTRY') {
    return true;
  }
  const metadata = new Metadata(_metadata);
  metadata.selectNumberingPlan(phoneNumber.countryCallingCode);
  const phoneNumberRegion = phoneNumber.country || getCountryByCallingCode(phoneNumber.countryCallingCode, {
    nationalNumber: phoneNumber.nationalNumber,
    metadata
  });

  // Check if a national prefix should be present when formatting this number.
  const nationalNumber = phoneNumber.nationalNumber;
  const format = chooseFormatForNumber(metadata.numberingPlan.formats(), nationalNumber);

  // To do this, we check that a national prefix formatting rule was present
  // and that it wasn't just the first-group symbol ($1) with punctuation.
  if (format.nationalPrefixFormattingRule()) {
    if (metadata.numberingPlan.nationalPrefixIsOptionalWhenFormattingInNationalFormat()) {
      // The national-prefix is optional in these cases, so we don't need to check if it was present.
      return true;
    }
    if (!format.usesNationalPrefix()) {
      // National Prefix not needed for this number.
      return true;
    }
    return Boolean(phoneNumber.nationalPrefix);
  }
  return true;
}
export function containsMoreThanOneSlashInNationalNumber(phoneNumber, candidate) {
  const firstSlashInBodyIndex = candidate.indexOf('/');
  if (firstSlashInBodyIndex < 0) {
    // No slashes, this is okay.
    return false;
  }

  // Now look for a second one.
  const secondSlashInBodyIndex = candidate.indexOf('/', firstSlashInBodyIndex + 1);
  if (secondSlashInBodyIndex < 0) {
    // Only one slash, this is okay.
    return false;
  }

  // If the first slash is after the country calling code, this is permitted.
  const candidateHasCountryCode = phoneNumber.__countryCallingCodeSource === 'FROM_NUMBER_WITH_PLUS_SIGN' || phoneNumber.__countryCallingCodeSource === 'FROM_NUMBER_WITHOUT_PLUS_SIGN';
  if (candidateHasCountryCode && parseDigits(candidate.substring(0, firstSlashInBodyIndex)) === phoneNumber.countryCallingCode) {
    // Any more slashes and this is illegal.
    return candidate.slice(secondSlashInBodyIndex + 1).indexOf('/') >= 0;
  }
  return true;
}
function checkNumberGroupingIsValid(number, candidate, metadata, checkGroups, regExpCache) {
  throw new Error('This part of code hasn\'t been ported');
  const normalizedCandidate = normalizeDigits(candidate, true /* keep non-digits */);
  let formattedNumberGroups = getNationalNumberGroups(metadata, number, null);
  if (checkGroups(metadata, number, normalizedCandidate, formattedNumberGroups)) {
    return true;
  }

  // If this didn't pass, see if there are any alternate formats that match, and try them instead.
  const alternateFormats = MetadataManager.getAlternateFormatsForCountry(number.getCountryCode());
  const nationalSignificantNumber = util.getNationalSignificantNumber(number);
  if (alternateFormats) {
    for (const alternateFormat of alternateFormats.numberFormats()) {
      if (alternateFormat.leadingDigitsPatterns().length > 0) {
        // There is only one leading digits pattern for alternate formats.
        const leadingDigitsRegExp = regExpCache.getPatternForRegExp('^' + alternateFormat.leadingDigitsPatterns()[0]);
        if (!leadingDigitsRegExp.test(nationalSignificantNumber)) {
          // Leading digits don't match; try another one.
          continue;
        }
      }
      formattedNumberGroups = getNationalNumberGroups(metadata, number, alternateFormat);
      if (checkGroups(metadata, number, normalizedCandidate, formattedNumberGroups)) {
        return true;
      }
    }
  }
  return false;
}

/**
 * Helper method to get the national-number part of a number, formatted without any national
 * prefix, and return it as a set of digit blocks that would be formatted together following
 * standard formatting rules.
 */
function getNationalNumberGroups(metadata, number, formattingPattern) {
  throw new Error('This part of code hasn\'t been ported');
  if (formattingPattern) {
    // We format the NSN only, and split that according to the separator.
    const nationalSignificantNumber = util.getNationalSignificantNumber(number);
    return util.formatNsnUsingPattern(nationalSignificantNumber, formattingPattern, 'RFC3966', metadata).split('-');
  }

  // This will be in the format +CC-DG1-DG2-DGX;ext=EXT where DG1..DGX represents groups of digits.
  const rfc3966Format = formatNumber(number, 'RFC3966', metadata);

  // We remove the extension part from the formatted string before splitting it into different
  // groups.
  let endIndex = rfc3966Format.indexOf(';');
  if (endIndex < 0) {
    endIndex = rfc3966Format.length;
  }

  // The country-code will have a '-' following it.
  const startIndex = rfc3966Format.indexOf('-') + 1;
  return rfc3966Format.slice(startIndex, endIndex).split('-');
}
function allNumberGroupsAreExactlyPresent(metadata, number, normalizedCandidate, formattedNumberGroups) {
  throw new Error('This part of code hasn\'t been ported');
  const candidateGroups = normalizedCandidate.split(NON_DIGITS_PATTERN);

  // Set this to the last group, skipping it if the number has an extension.
  let candidateNumberGroupIndex = number.hasExtension() ? candidateGroups.length - 2 : candidateGroups.length - 1;

  // First we check if the national significant number is formatted as a block.
  // We use contains and not equals, since the national significant number may be present with
  // a prefix such as a national number prefix, or the country code itself.
  if (candidateGroups.length == 1 || candidateGroups[candidateNumberGroupIndex].contains(util.getNationalSignificantNumber(number))) {
    return true;
  }

  // Starting from the end, go through in reverse, excluding the first group, and check the
  // candidate and number groups are the same.
  let formattedNumberGroupIndex = formattedNumberGroups.length - 1;
  while (formattedNumberGroupIndex > 0 && candidateNumberGroupIndex >= 0) {
    if (candidateGroups[candidateNumberGroupIndex] !== formattedNumberGroups[formattedNumberGroupIndex]) {
      return false;
    }
    formattedNumberGroupIndex--;
    candidateNumberGroupIndex--;
  }

  // Now check the first group. There may be a national prefix at the start, so we only check
  // that the candidate group ends with the formatted number group.
  return candidateNumberGroupIndex >= 0 && endsWith(candidateGroups[candidateNumberGroupIndex], formattedNumberGroups[0]);
}
function allNumberGroupsRemainGrouped(metadata, number, normalizedCandidate, formattedNumberGroups) {
  throw new Error('This part of code hasn\'t been ported');
  let fromIndex = 0;
  if (number.getCountryCodeSource() !== CountryCodeSource.FROM_DEFAULT_COUNTRY) {
    // First skip the country code if the normalized candidate contained it.
    const countryCode = String(number.getCountryCode());
    fromIndex = normalizedCandidate.indexOf(countryCode) + countryCode.length();
  }

  // Check each group of consecutive digits are not broken into separate groupings in the
  // {@code normalizedCandidate} string.
  for (let i = 0; i < formattedNumberGroups.length; i++) {
    // Fails if the substring of {@code normalizedCandidate} starting from {@code fromIndex}
    // doesn't contain the consecutive digits in formattedNumberGroups[i].
    fromIndex = normalizedCandidate.indexOf(formattedNumberGroups[i], fromIndex);
    if (fromIndex < 0) {
      return false;
    }
    // Moves {@code fromIndex} forward.
    fromIndex += formattedNumberGroups[i].length();
    if (i == 0 && fromIndex < normalizedCandidate.length()) {
      // We are at the position right after the NDC. We get the region used for formatting
      // information based on the country code in the phone number, rather than the number itself,
      // as we do not need to distinguish between different countries with the same country
      // calling code and this is faster.
      const region = util.getRegionCodeForCountryCode(number.getCountryCode());
      if (util.getNddPrefixForRegion(region, true) != null && Character.isDigit(normalizedCandidate.charAt(fromIndex))) {
        // This means there is no formatting symbol after the NDC. In this case, we only
        // accept the number if there is no formatting symbol at all in the number, except
        // for extensions. This is only important for countries with national prefixes.
        const nationalSignificantNumber = util.getNationalSignificantNumber(number);
        return startsWith(normalizedCandidate.slice(fromIndex - formattedNumberGroups[i].length), nationalSignificantNumber);
      }
    }
  }

  // The check here makes sure that we haven't mistakenly already used the extension to
  // match the last group of the subscriber number. Note the extension cannot have
  // formatting in-between digits.
  return normalizedCandidate.slice(fromIndex).contains(number.getExtension());
}
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