// EST Plus 2 REA 최종보고서 §6-11, §6-12의 계산 경로.
const EstWorkflows = (() => {
  function escalation(bid, contract, current, quantity) {
    if (!bid || !current) return { rate: 0, difference: 0, price: contract, amount: Math.trunc(contract * quantity) };
    const rate = Math.trunc(((current - bid) / bid) * 10000) / 100;
    let difference = 0;
    if (bid >= contract && current >= bid) difference = Math.trunc(contract * rate / 100);
    else if (bid < contract && current >= contract) difference = Math.trunc(current - contract);
    const price = contract + difference;
    return { rate, difference, price, amount: Math.trunc(price * quantity) };
  }
  function excluded(planned, actual, progress) { return Math.max(planned, actual, progress); }
  function resources(data) {
    const sources = Object.fromEntries(data.sources.map(s => [s.id,s]));
    const units = Object.fromEntries(data.units.map(u => [u.id,u]));
    const quantities = Object.create(null), errors = [];
    function expand(unitId, multiplier, path) {
      const unit = Object.hasOwn(units, unitId) ? units[unitId] : null;
      if (!unit) return;
      if (path.includes(unitId)) { errors.push(`순환 참조: ${unit.name}`); return; }
      for (const line of unit.lines) {
        if (line.calcIndex === 2 || line.calcIndex === 3 || line.type === '비율') continue;
        const quantity = multiplier * line.quantity;
        if (line.type === '일위대가') expand(line.unitId,quantity,[...path,unitId]);
        else if (Object.hasOwn(sources,line.sourceId)) quantities[line.sourceId] = (quantities[line.sourceId] || 0) + quantity;
      }
    }
    for (const row of data.estimate) expand(row.unitId,row.quantity,[]);
    return { rows: Object.entries(quantities).map(([id,quantity]) => ({source:sources[id],quantity})), errors };
  }
  return { escalation, excluded, resources };
})();
if (typeof module !== 'undefined') module.exports = EstWorkflows;