(function installLTJTProductLookup(root, factory) {
  const api = factory();
  if (typeof module !== 'undefined' && module.exports) module.exports = api;
  if (root) root.LTJTProductLookup = api;
}(typeof self !== 'undefined' ? self : globalThis, () => {
  'use strict';

  function compactProductLookupText(value) {
    return String(value || '')
      .normalize('NFKC')
      .toLowerCase()
      .replace(/[^\p{L}\p{N}]+/gu, '');
  }

  function normalizeProductQueryText(value) {
    // ERP products commonly write duration as 8D7N while users may write
    // 8天7晚. Only convert duration suffixes after a number so a product name
    // containing an ordinary Chinese character such as “天” is not changed.
    return compactProductLookupText(value)
      .replace(/(\d+)天/gu, '$1d')
      .replace(/(\d+)(?:晚|夜)/gu, '$1n');
  }

  function normalizeProductDuration(value) {
    return normalizeProductQueryText(value);
  }

  function isOrderedSubsequence(query, value) {
    let cursor = 0;
    for (const character of query) {
      const next = value.indexOf(character, cursor);
      if (next < 0) return false;
      cursor = next + character.length;
    }
    return true;
  }

  function collapseWhitespace(value) {
    return String(value || '').replace(/\s+/g, ' ').trim();
  }

  function rawCellText(element) {
    return String(element?.innerText || element?.textContent || '').trim();
  }

  function productLabelFromRow(row) {
    return collapseWhitespace(rawCellText(row?.cells?.[1] || row));
  }

  function productNameAndDuration(label) {
    const normalizedLabel = collapseWhitespace(label);
    // The current ERP renders the product name and duration in the same
    // second cell, separated by whitespace (for example “江西老挝 10D9N”).
    // Restrict the suffix parser to duration-shaped text so names containing
    // dates or numbers such as “尊享老挝3.10” remain intact.
    const durationMatch = normalizedLabel.match(/(?:^|\s)(\d+(?:\.\d+)?\s*(?:D|天)\s*\d+(?:\.\d+)?\s*(?:N|晚|夜)?)(?:\s*)$/iu);
    if (!durationMatch) return { name: normalizedLabel, duration: '' };
    const name = normalizedLabel.slice(0, durationMatch.index).trim();
    return {
      name: name || normalizedLabel,
      duration: collapseWhitespace(durationMatch[1]).replace(/\s+/g, '')
    };
  }

  function productCandidateFromRow(row, input = null) {
    const label = productLabelFromRow(row);
    const parts = productNameAndDuration(label);
    return {
      input,
      row,
      text: collapseWhitespace(rawCellText(row)),
      label,
      name: parts.name,
      duration: parts.duration,
      cpid: String(input?.value || '').trim()
    };
  }

  function productQueryTokens(query) {
    const normalizedQuery = normalizeProductQueryText(query);
    const hanRuns = normalizedQuery.match(/\p{Script=Han}+/gu) || [];
    const nonHanTokens = normalizedQuery.match(/\d+[a-z]+|[a-z]+\d*|\d+/g) || [];
    const durationTokens = nonHanTokens.filter((token) => /\d+d|\d+n/i.test(token));
    const nameTokens = nonHanTokens.filter((token) => !durationTokens.includes(token));
    return { normalizedQuery, hanRuns, durationTokens, nameTokens };
  }

  function productQueryMatch(candidateOrLabel, query) {
    const candidate = typeof candidateOrLabel === 'string'
      ? { label: candidateOrLabel, name: candidateOrLabel, duration: '' }
      : (candidateOrLabel || {});
    const normalizedLabel = compactProductLookupText(candidate.label || candidate.name || '');
    const normalizedQuery = normalizeProductQueryText(query);
    if (!normalizedQuery) return { matched: true, rule: 'empty_keyword' };
    if (normalizedLabel.includes(normalizedQuery)) return { matched: true, rule: 'unique_contiguous' };

    const { hanRuns, durationTokens, nameTokens } = productQueryTokens(query);
    if (!hanRuns.length && !durationTokens.length && !nameTokens.length) {
      return { matched: false, rule: 'no_tokens' };
    }

    const normalizedName = compactProductLookupText(candidate.name || candidate.label || '');
    const normalizedDuration = normalizeProductDuration(candidate.duration || '');
    if (hanRuns.some((run) => !isOrderedSubsequence(run, normalizedName))) {
      return { matched: false, rule: 'name_ordered_tokens' };
    }
    if (durationTokens.some((token) => !normalizedDuration.includes(token) && !normalizedLabel.includes(token))) {
      return { matched: false, rule: 'duration_tokens' };
    }
    if (nameTokens.some((token) => !normalizedName.includes(token) && !normalizedLabel.includes(token))) {
      return { matched: false, rule: 'name_numeric_tokens' };
    }
    return {
      matched: true,
      rule: durationTokens.length ? 'unique_name_duration_tokens' : 'unique_ordered_tokens'
    };
  }

  function collectProductCandidates(scopeDocument) {
    return Array.from(scopeDocument?.querySelectorAll?.('input[name="cp_id"], input[name="cpid"]') || [])
      .map((input) => {
        const row = input.closest('tr') || input.parentElement?.parentElement || input.parentElement;
        return productCandidateFromRow(row, input);
      });
  }

  function matchProductCandidates(candidates, query, cpid = '') {
    const expectedCpid = String(cpid || '').trim();
    return (candidates || [])
      .filter((candidate) => !expectedCpid || String(candidate.cpid || '').trim() === expectedCpid)
      .map((candidate) => ({
        ...candidate,
        match: productQueryMatch(candidate, query)
      }))
      .filter((candidate) => candidate.match.matched);
  }

  return {
    compactProductLookupText,
    normalizeProductQueryText,
    normalizeProductDuration,
    isOrderedSubsequence,
    productLabelFromRow,
    productNameAndDuration,
    productCandidateFromRow,
    productQueryTokens,
    productQueryMatch,
    collectProductCandidates,
    matchProductCandidates
  };
}));