/**
 * 识图传方报价：请求侧增量组装
 * 首次全量 drugs；同味数下只传 quote_token + drugs_patch
 */

export type QuoteDrugRow = {
  drug_id: number;
  name?: string;
  number?: number;
  price?: number;
  way_id?: number;
  [key: string]: unknown;
};

/** 比较两味报价药品是否等价（用于算 patch） */
export function isSameQuoteDrug(
  a?: QuoteDrugRow | null,
  b?: QuoteDrugRow | null,
): boolean {
  if (!a || !b) return false;
  return (
    Number(a.drug_id || 0) === Number(b.drug_id || 0) &&
    Number(a.number || 0) === Number(b.number || 0) &&
    Number(a.price || 0) === Number(b.price || 0) &&
    String(a.name || '') === String(b.name || '') &&
    Number(a.way_id || 0) === Number(b.way_id || 0)
  );
}

/**
 * 组装增量报价入参
 * 为什么：点选改一味时不必每次 POST 整方 drugs，服务端用 token 缓存整方再 merge patch
 */
export function buildIncrementalQuotePayload(opts: {
  scalars: Record<string, any>;
  drugs: QuoteDrugRow[];
  quoteToken?: string;
  lastQuoteDrugs?: QuoteDrugRow[] | null;
}): { payload: Record<string, any>; nextLastDrugs: QuoteDrugRow[] } {
  const scalars = opts.scalars || {};
  const drugs = Array.isArray(opts.drugs) ? opts.drugs : [];
  const quoteToken = String(opts.quoteToken || '').trim();
  const prev = Array.isArray(opts.lastQuoteDrugs) ? opts.lastQuoteDrugs : null;
  const payload: Record<string, any> = { ...scalars };
  if (quoteToken) {
    payload.quote_token = quoteToken;
  }
  if (!quoteToken || !prev || prev.length !== drugs.length) {
    payload.drugs = drugs;
    return { payload, nextLastDrugs: drugs };
  }
  const patches: Array<{ index: number; drug: QuoteDrugRow }> = [];
  for (let i = 0; i < drugs.length; i++) {
    if (!isSameQuoteDrug(prev[i], drugs[i])) {
      patches.push({ index: i, drug: drugs[i] });
    }
  }
  if (patches.length === 0) {
    return { payload, nextLastDrugs: prev };
  }
  if (patches.length >= drugs.length) {
    payload.drugs = drugs;
  } else {
    payload.drugs_patch = patches;
  }
  return { payload, nextLastDrugs: drugs };
}