/** 企微结算账单正文：字段块 / markdown_v2 表格 + 字节上限（机器人约 4096 字节） */

export type WecomBankLike = {
  bankAccountName?: string | null;
  bankName?: string | null;
  bankBranch?: string | null;
  bankAccountNo?: string | null;
};

export function formatYuan(n: number): string {
  return `¥${Number(n).toFixed(2)}`;
}

export function formatPercent(rate: number): string {
  const p = Number(rate) * 100;
  if (!Number.isFinite(p)) return '—';
  const rounded = Math.round(p * 100) / 100;
  const text = Number.isInteger(rounded) ? String(rounded) : String(rounded);
  return `${text}%`;
}

export function formatPartnerDashLabel(
  company?: string | null,
  name?: string | null,
): string {
  const person = (name || '').trim() || '—';
  const org = (company || '').trim();
  return org ? `${org}-${person}` : person;
}

export function wecomBankParts(bank?: WecomBankLike | null): {
  payee: string;
  accountNo: string;
  bankBranch: string;
} {
  if (!bank) return { payee: '未登记', accountNo: '—', bankBranch: '—' };
  const payee = bank.bankAccountName?.trim() || '';
  const accountNo = bank.bankAccountNo?.trim() || '';
  const bankBranch = bank.bankName?.trim() || bank.bankBranch?.trim() || '';
  if (!payee && !accountNo) {
    return { payee: '未登记', accountNo: '—', bankBranch: bankBranch || '—' };
  }
  return {
    payee: payee || '—',
    accountNo: accountNo || '—',
    bankBranch: bankBranch || '—',
  };
}

export function formatWecomFieldBlock(rows: Array<[string, string]>): string {
  return rows.map(([k, v]) => `${k}：${v}`).join('\n');
}

function escapeWecomTableCell(v: string): string {
  const text = String(v ?? '')
    .replace(/\|/g, '｜')
    .replace(/\r?\n/g, ' ')
    .trim();
  return text || '—';
}

/** 企微 markdown_v2 键值表：表头为标题，下列为字段/值 */
export function formatWecomKvTable(header: string, rows: Array<[string, string]>): string {
  const lines = [`| ${escapeWecomTableCell(header)} | |`, '| :--- | ---: |'];
  for (const [k, v] of rows) {
    lines.push(`| ${escapeWecomTableCell(k)} | ${escapeWecomTableCell(v)} |`);
  }
  return lines.join('\n');
}

export function filterNonZeroWecomBills<T extends { amount: number }>(rows: T[]): T[] {
  return rows.filter((r) => Number(r.amount) > 0);
}

export function joinLimited(names: string[], unit: string, max = 8): string {
  const uniq = [...new Set(names.map((n) => n.trim()).filter(Boolean))];
  if (!uniq.length) return '—';
  if (uniq.length <= max) return uniq.join('、');
  return `${uniq.slice(0, max).join('、')} 等${uniq.length}${unit}`;
}

const BILL_DIGEST_MAX_BYTES = 3200;

export function capBillBlocks(blocks: string[]): string {
  if (!blocks.length) return '无';
  const out: string[] = [];
  let bytes = 0;
  let shown = 0;
  for (const block of blocks) {
    const extra = (shown ? 2 : 0) + Buffer.byteLength(block, 'utf8');
    if (shown > 0 && bytes + extra > BILL_DIGEST_MAX_BYTES) {
      out.push(`另有 ${blocks.length - shown} 笔未列出，请到 HQ 查看`);
      break;
    }
    out.push(block);
    bytes += extra;
    shown += 1;
  }
  return out.join('\n\n');
}

export function formatStoreBillWecomBlock(row: {
  cityName: string;
  storeName: string;
  partnerLabel: string;
  redeemCount: number;
  redeemAmount: number;
  settlementRate: number;
  amount: number;
  bank?: WecomBankLike | null;
}): string {
  const bank = wecomBankParts(row.bank);
  return formatWecomFieldBlock([
    ['城市', row.cityName || '—'],
    ['门店', row.storeName || '—'],
    ['合伙人', row.partnerLabel || '—'],
    ['核销笔数', String(row.redeemCount)],
    ['核销金额', formatYuan(row.redeemAmount)],
    ['结算比例', formatPercent(row.settlementRate)],
    ['账单', formatYuan(row.amount)],
    ['收款人', bank.payee],
    ['收款账户', bank.accountNo],
    ['收款开户行', bank.bankBranch],
  ]);
}

export function formatPartnerBillWecomBlock(row: {
  partnerLabel: string;
  period: string;
  orderCount?: number;
  orderAmount?: number;
  orderCommission: number;
  redeemCount?: number;
  redeemAmount?: number;
  redeemCommission: number;
  amount: number;
  bank?: WecomBankLike | null;
}): string {
  const bank = wecomBankParts(row.bank);
  return formatWecomKvTable(row.partnerLabel || '—', [
    ['账期', row.period || '—'],
    ['订单数量', String(row.orderCount ?? 0)],
    ['订单金额', formatYuan(row.orderAmount ?? 0)],
    ['订单佣金', formatYuan(row.orderCommission)],
    ['核销单数量', String(row.redeemCount ?? 0)],
    ['核销金额', formatYuan(row.redeemAmount ?? 0)],
    ['核销佣金', formatYuan(row.redeemCommission)],
    ['累计金额', formatYuan(row.amount)],
    ['收款人', bank.payee],
    ['收款银行账号', bank.accountNo],
    ['开户行', bank.bankBranch],
  ]);
}

export function formatLogisticsBillWecomBlock(row: {
  cityNames: string;
  partnerNames: string;
  providerName: string;
  settlementMethod: string;
  orderCount: number;
  bottleCount: number;
  amount: number;
  bank?: WecomBankLike | null;
}): string {
  const bank = wecomBankParts(row.bank);
  return formatWecomFieldBlock([
    ['城市', row.cityNames || '—'],
    ['合伙人', row.partnerNames || '—'],
    ['承运商', row.providerName || '—'],
    ['结算方式', row.settlementMethod || '—'],
    ['发货笔数', String(row.orderCount)],
    ['瓶数', String(row.bottleCount)],
    ['账单', formatYuan(row.amount)],
    ['收款人', bank.payee],
    ['收款账户', bank.accountNo],
    ['收款开户行', bank.bankBranch],
  ]);
}