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;
}