feat: add fee workspace and polish AI presentation

modules/billing/types.ts

@@ -0,0 +1,169 @@
+export const BILLING_STATUS_VALUES = ["paid", "partial", "pending", "overdue"] as const;
+export type BillingStatus = (typeof BILLING_STATUS_VALUES)[number];
+
+export const BILLING_STATUS_LABELS: Record<BillingStatus, string> = {
+  paid: "已结清",
+  partial: "部分收款",
+  pending: "待收款",
+  overdue: "已逾期",
+};
+
+export const PAYMENT_METHOD_VALUES = ["wechat", "alipay", "bank_transfer", "card", "cash"] as const;
+export type PaymentMethod = (typeof PAYMENT_METHOD_VALUES)[number];
+
+export const PAYMENT_METHOD_LABELS: Record<PaymentMethod, string> = {
+  wechat: "微信支付",
+  alipay: "支付宝",
+  bank_transfer: "银行转账",
+  card: "银行卡",
+  cash: "现金",
+};
+
+export const INVOICE_STATUS_VALUES = ["not_requested", "pending", "issued"] as const;
+export type InvoiceStatus = (typeof INVOICE_STATUS_VALUES)[number];
+
+export const INVOICE_STATUS_LABELS: Record<InvoiceStatus, string> = {
+  not_requested: "未开票",
+  pending: "待开票",
+  issued: "已开票",
+};
+
+export type BillingCharge = {
+  id: string;
+  category: string;
+  description: string;
+  quantity: number;
+  serviceDate: string;
+  unitPriceCents: number;
+};
+
+export type BillingPayment = {
+  id: string;
+  amountCents: number;
+  method: PaymentMethod;
+  paidAt: string;
+  reference: string;
+  operator: string;
+  note: string;
+};
+
+export type BillingStatement = {
+  id: string;
+  elderId: string;
+  elderName: string;
+  roomLabel: string;
+  contactName: string;
+  contactPhone: string;
+  period: string;
+  dueAt: string;
+  charges: BillingCharge[];
+  payments: BillingPayment[];
+  invoiceStatus: InvoiceStatus;
+  invoiceNumber?: string;
+  receiptCount: number;
+};
+
+export type BillingStatementView = BillingStatement & {
+  totalCents: number;
+  paidCents: number;
+  outstandingCents: number;
+  status: BillingStatus;
+};
+
+export type BillingSummary = {
+  receivableCents: number;
+  collectedCents: number;
+  outstandingCents: number;
+  overdueCount: number;
+};
+
+export function getChargeAmountCents(charge: BillingCharge): number {
+  return Math.round(charge.quantity * charge.unitPriceCents);
+}
+
+export function getStatementTotalCents(statement: BillingStatement): number {
+  return statement.charges.reduce((total, charge) => total + getChargeAmountCents(charge), 0);
+}
+
+export function getStatementPaidCents(statement: BillingStatement): number {
+  return statement.payments.reduce((total, payment) => total + payment.amountCents, 0);
+}
+
+export function getStatementOutstandingCents(statement: BillingStatement): number {
+  return Math.max(0, getStatementTotalCents(statement) - getStatementPaidCents(statement));
+}
+
+export function getBillingStatus(statement: BillingStatement, referenceDate = new Date()): BillingStatus {
+  const outstandingCents = getStatementOutstandingCents(statement);
+  if (outstandingCents === 0) {
+    return "paid";
+  }
+
+  if (new Date(statement.dueAt).getTime() < referenceDate.getTime()) {
+    return "overdue";
+  }
+
+  return statement.payments.length > 0 ? "partial" : "pending";
+}
+
+export function toBillingStatementView(
+  statement: BillingStatement,
+  referenceDate = new Date(),
+): BillingStatementView {
+  const totalCents = getStatementTotalCents(statement);
+  const paidCents = getStatementPaidCents(statement);
+  return {
+    ...statement,
+    totalCents,
+    paidCents,
+    outstandingCents: Math.max(0, totalCents - paidCents),
+    status: getBillingStatus(statement, referenceDate),
+  };
+}
+
+export function calculateBillingSummary(
+  statements: readonly BillingStatement[],
+  referenceDate = new Date(),
+): BillingSummary {
+  return statements.reduce<BillingSummary>(
+    (summary, statement) => {
+      const view = toBillingStatementView(statement, referenceDate);
+      return {
+        receivableCents: summary.receivableCents + view.totalCents,
+        collectedCents: summary.collectedCents + view.paidCents,
+        outstandingCents: summary.outstandingCents + view.outstandingCents,
+        overdueCount: summary.overdueCount + (view.status === "overdue" ? 1 : 0),
+      };
+    },
+    { receivableCents: 0, collectedCents: 0, outstandingCents: 0, overdueCount: 0 },
+  );
+}
+
+export function addBillingPayment(statement: BillingStatement, payment: BillingPayment): BillingStatement {
+  return {
+    ...statement,
+    payments: [payment, ...statement.payments],
+  };
+}
+
+export function addBillingCharge(statement: BillingStatement, charge: BillingCharge): BillingStatement {
+  return {
+    ...statement,
+    charges: [...statement.charges, charge],
+    invoiceStatus: "not_requested",
+    invoiceNumber: undefined,
+  };
+}
+
+export function formatCny(cents: number): string {
+  return new Intl.NumberFormat("zh-CN", {
+    style: "currency",
+    currency: "CNY",
+    minimumFractionDigits: 2,
+  }).format(cents / 100);
+}
+
+export function formatBillingPeriod(period: string): string {
+  const [year, month] = period.split("-");
+  return year && month ? `${year}年${month}月` : period;
+}