import type { MothershipAddressCandidate } from "@/lib/frontend/types";

/** 从候选列表中按门牌号/城市/街道词打分，避免误选 Bridge 等歧义项 */
export function pickBestMothershipCandidate(
  candidates: MothershipAddressCandidate[],
  draft: { street: string; city: string; state: string },
): MothershipAddressCandidate | undefined {
  if (!candidates.length) {
    return undefined;
  }
  const streetNum = draft.street.match(/^\d+/)?.[0];
  const city = draft.city.trim().toLowerCase();
  const state = draft.state.trim().toLowerCase();
  const streetWords = draft.street
    .toLowerCase()
    .split(/\s+/)
    .filter((w) => w.length > 2 && !/^(st|street|ave|avenue|rd|road|blvd|dr|drive)$/i.test(w));

  let best = candidates[0]!;
  let bestScore = -1;
  for (const candidate of candidates) {
    const label = (
      candidate.display_label ||
      candidate.formatted_address ||
      ""
    ).toLowerCase();
    let score = 0;
    if (streetNum && label.includes(streetNum)) {
      score += 12;
    }
    if (city && label.includes(city)) {
      score += 6;
    }
    if (state && label.includes(state)) {
      score += 3;
    }
    for (const word of streetWords) {
      if (label.includes(word)) {
        score += 2;
      }
    }
    if (/\bbridge\b/.test(label) && !/\bbridge\b/i.test(draft.street)) {
      score -= 20;
    }
    if (score > bestScore) {
      bestScore = score;
      best = candidate;
    }
  }
  return best;
}