export interface ProductPricing {
  price: number;
  benefitAmount?: number | null;
}

export function calcBenefitAmount(product: ProductPricing): number {
  return product.benefitAmount ?? product.price;
}

export type ProductSaleUnit = 'BOTTLE' | 'BOX';

/** 销售数量 → 瓶当量 */
export function toBottleQuantity(quantity: number, bottlesPerUnit = 1): number {
  const qty = Math.floor(Number(quantity) || 0);
  const per = Math.floor(Number(bottlesPerUnit) || 0);
  if (qty <= 0 || per <= 0) return 0;
  return qty * per;
}

/**
 * 城市起购瓶数 → 最少销售单位数量（向上取整）
 * 例：同城 2 瓶、整箱 6 瓶/箱 → minSaleQty = 1
 */
export function toMinSaleQuantity(minBottleQty: number, bottlesPerUnit = 1): number {
  const minBottles = Math.floor(Number(minBottleQty) || 0);
  const per = Math.floor(Number(bottlesPerUnit) || 0);
  if (minBottles <= 0) return 1;
  if (per <= 0) return minBottles;
  return Math.max(1, Math.ceil(minBottles / per));
}

export function saleUnitLabel(saleUnit: ProductSaleUnit | string | null | undefined): string {
  return saleUnit === 'BOX' ? '箱' : '瓶';
}

export function validateMinPurchase(
  deliveryType: 'LOCAL' | 'CROSS_CITY' | 'ON_SITE_PICKUP',
  quantity: number,
  localMinQty: number,
  crossMinQty: number,
  options?: { bottlesPerUnit?: number; saleUnit?: ProductSaleUnit },
): { ok: boolean; message?: string } {
  const bottlesPerUnit = options?.bottlesPerUnit ?? 1;
  const saleUnit = options?.saleUnit ?? (bottlesPerUnit > 1 ? 'BOX' : 'BOTTLE');
  const bottleQty = toBottleQuantity(quantity, bottlesPerUnit);
  const unit = saleUnitLabel(saleUnit);

  if (deliveryType === 'ON_SITE_PICKUP') {
    const minBottles = localMinQty > 0 ? localMinQty : 2;
    if (bottleQty < minBottles) {
      const minSale = toMinSaleQuantity(minBottles, bottlesPerUnit);
      return { ok: false, message: `现场提货至少购买 ${minSale}${unit}` };
    }
    return { ok: true };
  }
  const minBottles = deliveryType === 'LOCAL' ? localMinQty : crossMinQty;
  if (bottleQty < minBottles) {
    const minSale = toMinSaleQuantity(minBottles, bottlesPerUnit);
    return {
      ok: false,
      message:
        deliveryType === 'LOCAL'
          ? `同城配送至少购买 ${minSale}${unit}`
          : `跨城配送至少购买 ${minSale}${unit}`,
    };
  }
  return { ok: true };
}

export const DEFAULT_STORE_SETTLEMENT_RATE = 0.6;

export function resolveSettlementRate(raw: unknown): number {
  const n = Number(raw);
  return Number.isFinite(n) && n > 0 ? n : DEFAULT_STORE_SETTLEMENT_RATE;
}

export function validateRedeemAmount(
  balance: number,
  amount: number,
  documentAmount?: number | null,
): { ok: boolean; message?: string } {
  if (!Number.isFinite(amount) || amount <= 0) {
    return { ok: false, message: '核销金额必须大于 0' };
  }
  if (!Number.isFinite(balance) || amount > balance) {
    return { ok: false, message: '核销金额不能超过可用余额' };
  }
  if (documentAmount != null && Number.isFinite(documentAmount) && amount > documentAmount) {
    return { ok: false, message: '核销金额不能超过该核销单可用金额' };
  }
  return { ok: true };
}

export interface BenefitCouponBalance {
  id: string;
  balance: number;
  createdAt: number;
}

/** FIFO 跨多张权益券分配核销金额（购酒按单发券，展示为总余额） */
export function allocateBenefitCoupons(
  coupons: BenefitCouponBalance[],
  amount: number,
  documentAmount?: number | null,
): { ok: true; allocations: Array<{ couponId: string; amount: number }> } | { ok: false; message: string } {
  const active = coupons
    .filter((c) => c.balance > 0)
    .sort((a, b) => a.createdAt - b.createdAt);
  const totalBalance = active.reduce((sum, c) => sum + c.balance, 0);
  const check = validateRedeemAmount(totalBalance, amount, documentAmount);
  if (!check.ok) return { ok: false, message: check.message! };

  let remaining = amount;
  const allocations: Array<{ couponId: string; amount: number }> = [];
  for (const coupon of active) {
    if (remaining <= 0) break;
    const take = Math.min(coupon.balance, remaining);
    allocations.push({ couponId: coupon.id, amount: take });
    remaining = Math.round((remaining - take) * 100) / 100;
  }

  if (remaining > 0) {
    return { ok: false, message: '权益余额不足' };
  }

  return { ok: true, allocations };
}

export function calcBenefitSummary(
  balances: number[],
): { totalBalance: number; maxRedeemAmount: number; activeCouponCount: number } {
  const totalBalance = Math.round(balances.reduce((sum, b) => sum + b, 0) * 100) / 100;
  return {
    totalBalance,
    maxRedeemAmount: totalBalance,
    activeCouponCount: balances.length,
  };
}

export function calcRedeemSettleAmount(amount: number, settlementRate: number): number {
  return Math.round(amount * settlementRate * 100) / 100;
}

export function sumUnbilledPayoutAmount(payouts: Array<{ payoutAmount: number }>): number {
  return Math.round(payouts.reduce((sum, p) => sum + Number(p.payoutAmount || 0), 0) * 100) / 100;
}

export type ValidateStoreWithdrawInput = {
  availableAmount: number;
  requestAmount: number;
  todayApplied: number;
  dailyLimit: number;
  hasBankAccount: boolean;
};

/** 门店未出账提现护栏（FIN-002 单日上限 + 账户） */
export function validateStoreWithdraw(
  input: ValidateStoreWithdrawInput,
): { ok: boolean; message?: string } {
  if (!input.hasBankAccount) {
    return { ok: false, message: '请先完善入驻收款账户后再提现' };
  }
  if (!(input.requestAmount > 0)) {
    return { ok: false, message: '提现金额必须大于 0' };
  }
  if (input.requestAmount > input.availableAmount + 1e-9) {
    return { ok: false, message: '提现金额不能超过可提未出账余额' };
  }
  const remaining = Math.round((input.dailyLimit - input.todayApplied) * 100) / 100;
  if (remaining <= 0) {
    return { ok: false, message: `已达单店单日提现上限 ¥${input.dailyLimit.toFixed(2)}` };
  }
  if (input.requestAmount > remaining + 1e-9) {
    return {
      ok: false,
      message: `超过单日剩余额度 ¥${remaining.toFixed(2)}（上限 ¥${input.dailyLimit.toFixed(2)}）`,
    };
  }
  return { ok: true };
}

/**
 * 按 FIFO 选取未出账 payout，使合计尽量等于 targetAmount（不超过目标）。
 * 若无法精确凑齐，返回合计 ≤ target 的最长前缀子集。
 */
export function pickPayoutsForWithdrawAmount<T extends { payoutAmount: number }>(
  payoutsAsc: T[],
  targetAmount: number,
): { ok: true; selected: T[]; amount: number } | { ok: false; message: string } {
  if (!(targetAmount > 0)) return { ok: false, message: '提现金额必须大于 0' };
  const selected: T[] = [];
  let sum = 0;
  for (const p of payoutsAsc) {
    const next = Math.round((sum + Number(p.payoutAmount)) * 100) / 100;
    if (next <= targetAmount + 1e-9) {
      selected.push(p);
      sum = next;
      if (Math.abs(sum - targetAmount) < 1e-9) break;
    } else {
      break;
    }
  }
  if (!selected.length) {
    return { ok: false, message: '无可匹配的未出账结算明细，请调整提现金额' };
  }
  if (Math.abs(sum - targetAmount) > 1e-9) {
    return {
      ok: false,
      message: `无法按 ¥${targetAmount.toFixed(2)} 精确匹配明细，请按可提总额全额提现或调整金额`,
    };
  }
  return { ok: true, selected, amount: sum };
}

const TIME_HM_RE = /^([01]\d|2[0-3]):([0-5]\d)$/;

export type BusinessHoursSegment = { open: string; close: string };

export function timeToMinutes(hhmm: string): number {
  const [h, m] = hhmm.split(':').map(Number);
  return h * 60 + m;
}

/** 校验 1～2 段营业时间，例如 09:00-22:00 或 09:00-14:00 + 17:00-21:00 */
export function validateBusinessHours(
  segments: BusinessHoursSegment[],
): { ok: boolean; message?: string } {
  const cleaned = segments
    .map((s) => ({ open: String(s.open || '').trim(), close: String(s.close || '').trim() }))
    .filter((s) => s.open || s.close);
  if (cleaned.length < 1) return { ok: false, message: '请设置营业时间' };
  if (cleaned.length > 2) return { ok: false, message: '营业时间最多支持 2 段' };
  for (let i = 0; i < cleaned.length; i++) {
    const s = cleaned[i];
    if (!TIME_HM_RE.test(s.open) || !TIME_HM_RE.test(s.close)) {
      return { ok: false, message: `第 ${i + 1} 段时间格式须为 HH:MM` };
    }
    if (timeToMinutes(s.open) >= timeToMinutes(s.close)) {
      return { ok: false, message: `第 ${i + 1} 段结束时间须晚于开始时间` };
    }
  }
  if (cleaned.length === 2 && timeToMinutes(cleaned[0].close) >= timeToMinutes(cleaned[1].open)) {
    return { ok: false, message: '第二段开始时间须晚于第一段结束时间' };
  }
  return { ok: true };
}

export function formatBusinessHours(store: {
  openTime?: string | null;
  closeTime?: string | null;
  openTime2?: string | null;
  closeTime2?: string | null;
}): string {
  const parts: string[] = [];
  if (store.openTime && store.closeTime) {
    parts.push(`${store.openTime}-${store.closeTime}`);
  }
  if (store.openTime2 && store.closeTime2) {
    parts.push(`${store.openTime2}-${store.closeTime2}`);
  }
  return parts.length ? parts.join('，') : '10:00-22:00';
}

/** 物流（快递）按瓶计价规则，如小飞侠：2瓶6元、加一瓶+2元、6瓶一箱14元 */
export const BOTTLES_PER_BOX = 6;

/** 小飞侠自动推单上限箱数：达到该箱数起拦截，需总部确认后推单或自配送 */
export const XFX_AUTO_DISPATCH_MAX_BOXES = 10;

/** 按箱规向上取整得到箱数 */
export function calcOrderBoxCount(quantity: number, bottlesPerBox = BOTTLES_PER_BOX): number {
  const qty = Math.floor(Number(quantity) || 0);
  if (qty <= 0 || !(bottlesPerBox > 0)) return 0;
  return Math.ceil(qty / bottlesPerBox);
}

/** 是否因大单拦截自动推承运商（默认 ≥10 箱 = 60 瓶） */
export function shouldHoldAutoCourierDispatch(
  quantity: number,
  options?: { bottlesPerBox?: number; maxBoxes?: number },
): boolean {
  const bottlesPerBox = options?.bottlesPerBox ?? BOTTLES_PER_BOX;
  const maxBoxes = options?.maxBoxes ?? XFX_AUTO_DISPATCH_MAX_BOXES;
  const qty = Math.floor(Number(quantity) || 0);
  return qty >= bottlesPerBox * maxBoxes;
}

/** 物流（快递）按瓶计价规则，如小飞侠：2瓶6元、加一瓶+2元、6瓶一箱14元 */
export type LogisticsPricingRule = {
  baseBottles: number;
  baseFee: number;
  extraBottleFee: number;
  boxBottles?: number;
  boxFee?: number;
};

function roundMoney(n: number): number {
  return Math.round(n * 100) / 100;
}

function calcLogisticsBottleLadder(quantity: number, rule: LogisticsPricingRule): number {
  const qty = Math.floor(quantity);
  if (qty <= 0) return 0;
  if (qty <= rule.baseBottles) return rule.baseFee;
  return rule.baseFee + (qty - rule.baseBottles) * rule.extraBottleFee;
}

/**
 * 按承运商计价标准计算单票物流费。
 * 配置了箱规时：整箱按 boxFee，余瓶按「起送瓶数/加瓶」阶梯。
 */
export function calcLogisticsFeeByBottles(quantity: number, rule: LogisticsPricingRule): number {
  const qty = Math.floor(Number(quantity) || 0);
  if (qty <= 0) return 0;
  if (!(rule.baseBottles > 0) || !(rule.baseFee >= 0) || !(rule.extraBottleFee >= 0)) {
    throw new Error('计价标准不完整');
  }

  const boxBottles = rule.boxBottles && rule.boxBottles > 0 ? rule.boxBottles : 0;
  const boxFee = rule.boxFee != null && rule.boxFee >= 0 ? rule.boxFee : null;
  if (boxBottles > 0 && boxFee != null) {
    const boxes = Math.floor(qty / boxBottles);
    const rem = qty % boxBottles;
    return roundMoney(boxes * boxFee + calcLogisticsBottleLadder(rem, rule));
  }
  return roundMoney(calcLogisticsBottleLadder(qty, rule));
}

export function generateUserNo(): string {
  const suffix = Math.floor(10000000 + Math.random() * 90000000);
  return `DK${suffix}`;
}

export function generateOrderNo(): string {
  const now = new Date();
  const y = now.getFullYear();
  const m = String(now.getMonth() + 1).padStart(2, '0');
  const d = String(now.getDate()).padStart(2, '0');
  const rand = String(Math.floor(Math.random() * 100000)).padStart(5, '0');
  return `DK${y}${m}${d}${rand}`;
}

export function generateCouponNo(): string {
  return `BC${Date.now()}${Math.floor(Math.random() * 1000)}`;
}

export function generateRedeemNo(): string {
  return `RD${Date.now()}${Math.floor(Math.random() * 1000)}`;
}

export function generateRedeemPendingNo(): string {
  return `RP${Date.now()}${Math.floor(Math.random() * 1000)}`;
}

/** 弱网核销：网络类失败达到该次数后触发兜底 */
export const REDEEM_WEAKNET_FAIL_THRESHOLD = 5;

export type RedeemErrorClass = 'NETWORK' | 'BUSINESS';

/** 门店端/服务端共用：区分网络类与业务类核销错误（仅 NETWORK 计入 5 次） */
export function classifyRedeemClientError(input: {
  status?: number | null;
  message?: string | null;
}): RedeemErrorClass {
  const status = input.status;
  const message = (input.message ?? '').toLowerCase();
  if (status != null && status >= 500) return 'NETWORK';
  if (status === 0 || status === 408 || status === 429 || status === 502 || status === 503 || status === 504) {
    return 'NETWORK';
  }
  if (
    /failed to fetch|network|timeout|timed out|econnreset|econnrefused|etimedout|abort|offline|连接|网络|超时/.test(
      message,
    )
  ) {
    return 'NETWORK';
  }
  return 'BUSINESS';
}

export function orderTabToStatuses(tab: string): string[] | undefined {
  switch (tab) {
    case 'pending_pay':
      return ['PENDING_PAY'];
    case 'paid':
    case 'pending_ship':
    case 'pending_receive':
      return ['PENDING_SHIP', 'OUT_WAREHOUSE', 'SHIPPING', 'PENDING_RECEIVE'];
    case 'completed':
      return ['COMPLETED'];
    default:
      return undefined;
  }
}

export * from './city-partner';
export * from './dev-plan';
export * from './support-ticket';
export * from './phone';