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src/modules/quotations/service.ts

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+import type { Quotation, CreateQuotation, UpdateQuotation } from "./model";
+
+// Mock quotations data
+const mockQuotations: Quotation[] = [
+  {
+    id: "quot-001",
+    quotationNumber: "QT-2024-001",
+    branch: "branch-01",
+    customerId: "cust-001",
+    customerName: "สมชาย ใจดี",
+    date: "2024-01-20T00:00:00Z",
+    validUntil: "2024-02-20T00:00:00Z",
+    subtotal: 50000,
+    taxRate: 0.07,
+    taxAmount: 3500,
+    totalAmount: 53500,
+    status: "sent",
+    notes: "Quotation for office supplies",
+    createdAt: "2024-01-20T09:00:00Z",
+    updatedAt: "2024-01-20T09:00:00Z",
+  },
+  {
+    id: "quot-002",
+    quotationNumber: "QT-2024-002",
+    branch: "branch-01",
+    customerId: "cust-002",
+    customerName: "วิภา สุขสันต์",
+    date: "2024-02-25T00:00:00Z",
+    validUntil: "2024-03-25T00:00:00Z",
+    subtotal: 120000,
+    taxRate: 0.07,
+    taxAmount: 8400,
+    totalAmount: 128400,
+    status: "accepted",
+    notes: "Quotation for computer equipment",
+    createdAt: "2024-02-25T10:30:00Z",
+    updatedAt: "2024-02-28T14:20:00Z",
+  },
+  {
+    id: "quot-003",
+    quotationNumber: "QT-2024-003",
+    branch: "branch-02",
+    customerId: "cust-004",
+    customerName: "มานี มีสุข",
+    date: "2024-03-10T00:00:00Z",
+    validUntil: "2024-04-10T00:00:00Z",
+    subtotal: 75000,
+    taxRate: 0.07,
+    taxAmount: 5250,
+    totalAmount: 80250,
+    status: "draft",
+    notes: null,
+    createdAt: "2024-03-10T11:00:00Z",
+    updatedAt: "2024-03-10T11:00:00Z",
+  },
+  {
+    id: "quot-004",
+    quotationNumber: "QT-2024-004",
+    branch: "head-office",
+    customerId: "cust-007",
+    customerName: "ภูมิ รักษ์โลก",
+    date: "2024-04-01T00:00:00Z",
+    validUntil: "2024-05-01T00:00:00Z",
+    subtotal: 200000,
+    taxRate: 0.07,
+    taxAmount: 14000,
+    totalAmount: 214000,
+    status: "sent",
+    notes: "Quotation for laboratory equipment",
+    createdAt: "2024-04-01T09:30:00Z",
+    updatedAt: "2024-04-01T09:30:00Z",
+  },
+];
+
+/**
+ * Get all quotations for a specific branch
+ * @param branch - Branch identifier
+ * @param status - Optional status filter
+ * @returns Array of quotations
+ */
+export function getAllQuotations(
+  branch: string,
+  status?: "draft" | "sent" | "accepted" | "rejected" | "expired",
+): Quotation[] {
+  let quotations = mockQuotations.filter((q) => q.branch === branch);
+
+  if (status) {
+    quotations = quotations.filter((q) => q.status === status);
+  }
+
+  return quotations;
+}
+
+/**
+ * Get a single quotation by ID and branch
+ * @param branch - Branch identifier
+ * @param id - Quotation ID
+ * @returns Quotation or undefined if not found
+ */
+export function getQuotationByIdAndBranch(
+  branch: string,
+  id: string,
+): Quotation | undefined {
+  const quotation = mockQuotations.find((q) => q.id === id);
+
+  // Only return if quotation belongs to the specified branch
+  if (quotation && quotation.branch === branch) {
+    return quotation;
+  }
+
+  return undefined;
+}
+
+/**
+ * Calculate tax and total amounts
+ * @param subtotal - Subtotal amount
+ * @param taxRate - Tax rate (e.g., 0.07 for 7%)
+ * @returns Object with taxAmount and totalAmount
+ */
+function calculateTotals(subtotal: number, taxRate: number) {
+  const taxAmount = subtotal * taxRate;
+  const totalAmount = subtotal + taxAmount;
+  return { taxAmount, totalAmount };
+}
+
+/**
+ * Create a new quotation
+ * @param data - Quotation creation data
+ * @returns Newly created quotation
+ */
+export function createQuotation(data: CreateQuotation): Quotation {
+  const { taxAmount, totalAmount } = calculateTotals(
+    data.subtotal,
+    data.taxRate,
+  );
+
+  const newQuotation: Quotation = {
+    id: `quot-${Date.now()}`,
+    quotationNumber: `QT-${new Date().getFullYear()}-${String(mockQuotations.length + 1).padStart(3, "0")}`,
+    ...data,
+    taxAmount,
+    totalAmount,
+    status: data.status || "draft",
+    createdAt: new Date().toISOString(),
+    updatedAt: new Date().toISOString(),
+  };
+
+  // In a real app, this would save to database
+  mockQuotations.push(newQuotation);
+  return newQuotation;
+}
+
+/**
+ * Update an existing quotation
+ * @param branch - Branch identifier
+ * @param id - Quotation ID
+ * @param data - Quotation update data
+ * @returns Updated quotation or undefined if not found
+ */
+export function updateQuotation(
+  branch: string,
+  id: string,
+  data: UpdateQuotation,
+): Quotation | undefined {
+  const quotation = getQuotationByIdAndBranch(branch, id);
+
+  if (!quotation) {
+    return undefined;
+  }
+
+  // Recalculate totals if subtotal or taxRate changed
+  let { taxAmount, totalAmount } = quotation;
+  if (data.subtotal !== undefined || data.taxRate !== undefined) {
+    const newSubtotal = data.subtotal ?? quotation.subtotal;
+    const newTaxRate = data.taxRate ?? quotation.taxRate;
+    const calculated = calculateTotals(newSubtotal, newTaxRate);
+    taxAmount = calculated.taxAmount;
+    totalAmount = calculated.totalAmount;
+  }
+
+  // Merge update data
+  const updatedQuotation: Quotation = {
+    ...quotation,
+    ...data,
+    taxAmount,
+    totalAmount,
+    updatedAt: new Date().toISOString(),
+  };
+
+  // In a real app, this would update database
+  const index = mockQuotations.findIndex((q) => q.id === id);
+  if (index !== -1) {
+    mockQuotations[index] = updatedQuotation;
+  }
+
+  return updatedQuotation;
+}
+
+/**
+ * Delete a quotation
+ * @param branch - Branch identifier
+ * @param id - Quotation ID
+ * @returns Deleted quotation or undefined if not found
+ */
+export function deleteQuotation(
+  branch: string,
+  id: string,
+): Quotation | undefined {
+  const quotation = getQuotationByIdAndBranch(branch, id);
+
+  if (!quotation) {
+    return undefined;
+  }
+
+  // In a real app, this would delete from database
+  const index = mockQuotations.findIndex((q) => q.id === id);
+  if (index !== -1) {
+    mockQuotations.splice(index, 1);
+  }
+
+  return quotation;
+}