/**
 * Tests for ShiftReportBuilder
 *
 * ShiftReportBuilder generates shift summary reports for thermal printers.
 * It shows opening/closing times, cash drawer balances, sales breakdown,
 * variance calculations, and optional signature lines.
 */

import { describe, it, expect, beforeEach, vi } from 'vitest';
import { ShiftReportBuilder, ShiftReportConfig } from '../ShiftReportBuilder';
import type { BusinessInfo, ShiftSummary } from '../../types';

// ESC/POS command constants for verification
const ESC = 0x1b;
const GS = 0x1d;
const LF = 0x0a;

/**
 * Helper to create a minimal business info object
 */
function createBusinessInfo(overrides: Partial<BusinessInfo> = {}): BusinessInfo {
  return {
    name: 'Test Business',
    address: '123 Main St',
    city: 'Testville',
    state: 'TS',
    zip: '12345',
    phone: '5551234567',
    ...overrides,
  };
}

/**
 * Helper to create a minimal shift summary object
 */
function createShiftSummary(overrides: Partial<ShiftSummary> = {}): ShiftSummary {
  return {
    id: 1,
    openedAt: '2024-12-26T09:00:00Z',
    closedAt: '2024-12-26T17:00:00Z',
    openedByName: 'Alice Smith',
    closedByName: 'Alice Smith',
    openingBalanceCents: 20000,
    expectedBalanceCents: 35000,
    actualBalanceCents: 35000,
    varianceCents: 0,
    cashSalesCents: 15000,
    cardSalesCents: 25000,
    giftCardSalesCents: 5000,
    totalSalesCents: 45000,
    transactionCount: 25,
    refundsCents: 0,
    ...overrides,
  };
}

/**
 * Helper to create shift report config
 */
function createConfig(overrides: Partial<ShiftReportConfig> = {}): ShiftReportConfig {
  return {
    includeSignatureLine: true,
    ...overrides,
  };
}

describe('ShiftReportBuilder', () => {
  let businessInfo: BusinessInfo;
  let shift: ShiftSummary;
  let config: ShiftReportConfig;

  beforeEach(() => {
    businessInfo = createBusinessInfo();
    shift = createShiftSummary();
    config = createConfig();
  });

  describe('constructor', () => {
    it('should create instance with default config', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift);
      expect(builder).toBeInstanceOf(ShiftReportBuilder);
    });

    it('should accept custom config', () => {
      const customConfig: ShiftReportConfig = {
        includeSignatureLine: false,
        managerName: 'Manager Bob',
        locationName: 'Downtown Store',
        printedByName: 'Alice',
      };
      const builder = new ShiftReportBuilder(businessInfo, shift, customConfig);
      expect(builder).toBeInstanceOf(ShiftReportBuilder);
    });

    it('should default includeSignatureLine to true', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, {});
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Signature:');
    });
  });

  describe('build()', () => {
    it('should return Uint8Array', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      expect(result).toBeInstanceOf(Uint8Array);
      expect(result.length).toBeGreaterThan(0);
    });

    it('should start with init command (ESC @)', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      expect(result[0]).toBe(ESC);
      expect(result[1]).toBe(0x40);
    });

    it('should end with partial cut command', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      // Partial cut is GS V 1
      const lastThreeBytes = Array.from(result.slice(-3));
      expect(lastThreeBytes).toContain(GS);
      expect(lastThreeBytes).toContain(0x56);
    });

    it('should contain line feeds', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const lfCount = Array.from(result).filter((b) => b === LF).length;
      expect(lfCount).toBeGreaterThan(10);
    });
  });

  describe('buildHeader()', () => {
    it('should include business name in uppercase', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain(businessInfo.name.toUpperCase());
    });

    it('should include location name when provided', () => {
      const configWithLocation = createConfig({
        locationName: 'Main Street Location',
      });
      const builder = new ShiftReportBuilder(businessInfo, shift, configWithLocation);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Main Street Location');
    });

    it('should skip location when not provided', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      // Should complete without error
      expect(result.length).toBeGreaterThan(0);
    });

    it('should include SHIFT REPORT title', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('SHIFT REPORT');
    });
  });

  describe('buildShiftTimes()', () => {
    it('should include shift ID', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Shift #:');
      expect(text).toContain('1');
    });

    it('should include opened time', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Opened:');
    });

    it('should include opened by name', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Opened By:');
      expect(text).toContain('Alice Smith');
    });

    it('should show Unknown when opened by is not provided', () => {
      const shiftNoOpener = createShiftSummary({ openedByName: '' });
      const builder = new ShiftReportBuilder(businessInfo, shiftNoOpener, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Opened By:');
      expect(text).toContain('Unknown');
    });

    it('should include closed time when shift is closed', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Closed:');
      expect(text).toContain('Closed By:');
    });

    it('should include duration for closed shifts', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Duration:');
      expect(text).toContain('8h'); // 9:00 to 17:00 = 8 hours
    });

    it('should show SHIFT STILL OPEN for open shifts', () => {
      const openShift = createShiftSummary({
        closedAt: null,
        closedByName: undefined,
        actualBalanceCents: null,
        varianceCents: null,
      });
      const builder = new ShiftReportBuilder(businessInfo, openShift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('*** SHIFT STILL OPEN ***');
    });

    it('should format time in business timezone when provided', () => {
      const shiftWithTz = createShiftSummary({
        business_timezone: 'America/New_York',
      });
      const builder = new ShiftReportBuilder(businessInfo, shiftWithTz, config);
      const result = builder.build();

      expect(result.length).toBeGreaterThan(0);
    });

    it('should show Unknown for closed by when not provided', () => {
      const shiftNoCloser = createShiftSummary({ closedByName: '' });
      const builder = new ShiftReportBuilder(businessInfo, shiftNoCloser, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Closed By:');
      expect(text).toContain('Unknown');
    });
  });

  describe('buildOpeningBalance()', () => {
    it('should include CASH DRAWER section header', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('CASH DRAWER');
    });

    it('should show opening balance', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Opening Balance:');
      expect(text).toContain('$200.00');
    });
  });

  describe('buildSalesBreakdown()', () => {
    it('should include SALES SUMMARY section header', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('SALES SUMMARY');
    });

    it('should show transaction count', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Transactions:');
      expect(text).toContain('25');
    });

    it('should show cash sales', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Cash Sales:');
      expect(text).toContain('$150.00');
    });

    it('should show card sales', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Card Sales:');
      expect(text).toContain('$250.00');
    });

    it('should show gift card sales', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Gift Card Sales:');
      expect(text).toContain('$50.00');
    });

    it('should show total sales', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Total Sales:');
      expect(text).toContain('$450.00');
    });

    it('should show refunds when present', () => {
      const shiftWithRefunds = createShiftSummary({
        refundsCents: 2500,
      });
      const builder = new ShiftReportBuilder(businessInfo, shiftWithRefunds, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Refunds:');
      expect(text).toContain('-$25.00');
    });

    it('should skip refunds when zero', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      // Refunds should not appear when zero
      const refundMatches = text.match(/Refunds:/g) || [];
      expect(refundMatches.length).toBe(0);
    });
  });

  describe('buildCashBalance()', () => {
    it('should include CASH BALANCE section header', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('CASH BALANCE');
    });

    it('should show opening balance in calculation', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      // Opening balance should appear in cash balance section
      const openingMatches = text.match(/Opening Balance:/g) || [];
      expect(openingMatches.length).toBeGreaterThanOrEqual(2); // Once in drawer, once in balance
    });

    it('should show cash sales in calculation', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('+ Cash Sales:');
    });

    it('should show expected balance', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Expected Balance:');
      expect(text).toContain('$350.00');
    });

    it('should show actual balance when shift is closed', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Actual Balance:');
    });

    it('should show (Not yet counted) when actual balance is null', () => {
      const openShift = createShiftSummary({
        closedAt: null,
        actualBalanceCents: null,
        varianceCents: null,
      });
      const builder = new ShiftReportBuilder(businessInfo, openShift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('(Not yet counted)');
    });

    describe('variance display', () => {
      it('should show zero variance correctly', () => {
        const builder = new ShiftReportBuilder(businessInfo, shift, config);
        const result = builder.build();

        const text = new TextDecoder().decode(result);
        expect(text).toContain('Variance:');
        expect(text).toContain('$0.00');
      });

      it('should show Over for positive variance', () => {
        const shiftOver = createShiftSummary({
          actualBalanceCents: 36000,
          varianceCents: 1000,
        });
        const builder = new ShiftReportBuilder(businessInfo, shiftOver, config);
        const result = builder.build();

        const text = new TextDecoder().decode(result);
        expect(text).toContain('Over:');
        expect(text).toContain('+$10.00');
      });

      it('should show Short for negative variance', () => {
        const shiftShort = createShiftSummary({
          actualBalanceCents: 33000,
          varianceCents: -2000,
        });
        const builder = new ShiftReportBuilder(businessInfo, shiftShort, config);
        const result = builder.build();

        const text = new TextDecoder().decode(result);
        expect(text).toContain('Short:');
        expect(text).toContain('-$20.00');
      });

      it('should skip variance when null', () => {
        const openShift = createShiftSummary({
          closedAt: null,
          actualBalanceCents: null,
          varianceCents: null,
        });
        const builder = new ShiftReportBuilder(businessInfo, openShift, config);
        const result = builder.build();

        const text = new TextDecoder().decode(result);
        expect(text).not.toContain('Variance:');
        expect(text).not.toContain('Over:');
        expect(text).not.toContain('Short:');
      });
    });
  });

  describe('buildSignatureLine()', () => {
    it('should include signature line when enabled', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Signature:');
      expect(text).toContain('_____'); // Underline
    });

    it('should skip signature line when disabled', () => {
      const noSigConfig = createConfig({ includeSignatureLine: false });
      const builder = new ShiftReportBuilder(businessInfo, shift, noSigConfig);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).not.toContain('Signature:');
    });

    it('should include manager name when provided', () => {
      const configWithManager = createConfig({
        managerName: 'Manager Carol',
      });
      const builder = new ShiftReportBuilder(
        businessInfo,
        shift,
        configWithManager
      );
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Manager: Manager Carol');
    });

    it('should skip manager name when not provided', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).not.toContain('Manager:');
    });

    it('should include date line', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Date:');
    });
  });

  describe('buildFooter()', () => {
    it('should include printed timestamp', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Printed:');
    });

    it('should include printed by name when provided', () => {
      const configWithPrinter = createConfig({
        printedByName: 'Alice',
      });
      const builder = new ShiftReportBuilder(
        businessInfo,
        shift,
        configWithPrinter
      );
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('By: Alice');
    });

    it('should skip printed by when not provided', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      // "By: " as a standalone line (for printed by) should not appear
      // Note: "Opened By:" and "Closed By:" will still be present
      const lines = text.split('\n');
      const printedByLine = lines.find(line => line.startsWith('By:'));
      expect(printedByLine).toBeUndefined();
    });

    it('should include confidentiality notice', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('CONFIDENTIAL - FOR INTERNAL USE ONLY');
    });
  });

  describe('duration calculation', () => {
    it('should show hours only when no minutes', () => {
      const exactHours = createShiftSummary({
        openedAt: '2024-12-26T09:00:00Z',
        closedAt: '2024-12-26T12:00:00Z',
      });
      const builder = new ShiftReportBuilder(businessInfo, exactHours, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Duration:');
      expect(text).toContain('3h');
    });

    it('should show minutes only when less than 1 hour', () => {
      const shortShift = createShiftSummary({
        openedAt: '2024-12-26T09:00:00Z',
        closedAt: '2024-12-26T09:45:00Z',
      });
      const builder = new ShiftReportBuilder(businessInfo, shortShift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Duration:');
      expect(text).toContain('45m');
    });

    it('should show hours and minutes', () => {
      const mixedShift = createShiftSummary({
        openedAt: '2024-12-26T09:00:00Z',
        closedAt: '2024-12-26T14:30:00Z',
      });
      const builder = new ShiftReportBuilder(businessInfo, mixedShift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Duration:');
      expect(text).toContain('5h 30m');
    });

    it('should handle invalid dates gracefully', () => {
      const badDates = createShiftSummary({
        openedAt: 'invalid',
        closedAt: 'also-invalid',
      });
      const builder = new ShiftReportBuilder(businessInfo, badDates, config);
      const result = builder.build();

      // Should not throw
      expect(result.length).toBeGreaterThan(0);
    });

    it('should show Invalid for negative duration', () => {
      const backwards = createShiftSummary({
        openedAt: '2024-12-26T17:00:00Z',
        closedAt: '2024-12-26T09:00:00Z',
      });
      const builder = new ShiftReportBuilder(businessInfo, backwards, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('Invalid');
    });
  });

  describe('currency formatting', () => {
    it('should format zero correctly', () => {
      const zeroShift = createShiftSummary({
        cashSalesCents: 0,
        cardSalesCents: 0,
        giftCardSalesCents: 0,
        totalSalesCents: 0,
        transactionCount: 0,
      });
      const builder = new ShiftReportBuilder(businessInfo, zeroShift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('$0.00');
    });

    it('should format large amounts correctly', () => {
      const bigShift = createShiftSummary({
        totalSalesCents: 1000000,
        cashSalesCents: 500000,
      });
      const builder = new ShiftReportBuilder(businessInfo, bigShift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('$10,000.00');
      expect(text).toContain('$5,000.00');
    });
  });

  describe('chaining', () => {
    it('should support method chaining for all section builders', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);

      // Each method should return `this`
      const result = builder
        .buildHeader()
        .buildShiftTimes()
        .buildOpeningBalance()
        .buildSalesBreakdown()
        .buildCashBalance()
        .buildSignatureLine()
        .buildFooter();

      expect(result).toBe(builder);
    });
  });

  describe('custom width', () => {
    it('should respect custom width from config', () => {
      const configWithWidth = createConfig({ width: 32 });
      const builder = new ShiftReportBuilder(businessInfo, shift, configWithWidth);
      const result = builder.build();

      expect(result.length).toBeGreaterThan(0);
    });
  });

  describe('complete report generation', () => {
    it('should generate a complete closed shift report', () => {
      const fullShift = createShiftSummary({
        id: 42,
        openedAt: '2024-12-26T08:30:00Z',
        closedAt: '2024-12-26T17:45:00Z',
        openedByName: 'Bob Johnson',
        closedByName: 'Carol Williams',
        openingBalanceCents: 15000,
        expectedBalanceCents: 48750,
        actualBalanceCents: 49000,
        varianceCents: 250,
        cashSalesCents: 33750,
        cardSalesCents: 45000,
        giftCardSalesCents: 12500,
        totalSalesCents: 91250,
        transactionCount: 47,
        refundsCents: 1500,
        business_timezone: 'America/Chicago',
      });

      const fullConfig: ShiftReportConfig = {
        includeSignatureLine: true,
        managerName: 'David Manager',
        locationName: 'Downtown Store',
        printedByName: 'Carol Williams',
      };

      const builder = new ShiftReportBuilder(businessInfo, fullShift, fullConfig);
      const result = builder.build();

      const text = new TextDecoder().decode(result);

      // Verify key sections
      expect(text).toContain('TEST BUSINESS');
      expect(text).toContain('Downtown Store');
      expect(text).toContain('SHIFT REPORT');
      expect(text).toContain('Shift #:');
      expect(text).toContain('42');
      expect(text).toContain('Bob Johnson');
      expect(text).toContain('Carol Williams');
      expect(text).toContain('Duration:');
      expect(text).toContain('CASH DRAWER');
      expect(text).toContain('$150.00'); // Opening balance
      expect(text).toContain('SALES SUMMARY');
      expect(text).toContain('47'); // Transaction count
      expect(text).toContain('$337.50'); // Cash sales
      expect(text).toContain('$450.00'); // Card sales
      expect(text).toContain('$125.00'); // Gift card sales
      expect(text).toContain('$912.50'); // Total sales
      expect(text).toContain('Refunds:');
      expect(text).toContain('-$15.00');
      expect(text).toContain('CASH BALANCE');
      expect(text).toContain('Expected Balance:');
      expect(text).toContain('Actual Balance:');
      expect(text).toContain('Over:');
      expect(text).toContain('+$2.50');
      expect(text).toContain('Manager: David Manager');
      expect(text).toContain('Signature:');
      expect(text).toContain('By: Carol Williams');
      expect(text).toContain('CONFIDENTIAL - FOR INTERNAL USE ONLY');
    });

    it('should generate a complete open shift report', () => {
      const openShift = createShiftSummary({
        id: 43,
        openedAt: '2024-12-26T08:00:00Z',
        closedAt: null,
        openedByName: 'Eve Adams',
        closedByName: undefined,
        openingBalanceCents: 20000,
        expectedBalanceCents: 27500,
        actualBalanceCents: null,
        varianceCents: null,
        cashSalesCents: 7500,
        cardSalesCents: 15000,
        giftCardSalesCents: 2500,
        totalSalesCents: 25000,
        transactionCount: 12,
        refundsCents: 0,
      });

      const openConfig: ShiftReportConfig = {
        includeSignatureLine: false,
        locationName: 'Mall Kiosk',
      };

      const builder = new ShiftReportBuilder(businessInfo, openShift, openConfig);
      const result = builder.build();

      const text = new TextDecoder().decode(result);

      // Verify open shift specifics
      expect(text).toContain('*** SHIFT STILL OPEN ***');
      expect(text).toContain('(Not yet counted)');
      expect(text).not.toContain('Variance:');
      expect(text).not.toContain('Over:');
      expect(text).not.toContain('Short:');
      expect(text).not.toContain('Signature:');
    });

    it('should generate report with short variance', () => {
      const shortShift = createShiftSummary({
        actualBalanceCents: 30000,
        expectedBalanceCents: 35000,
        varianceCents: -5000,
      });

      const builder = new ShiftReportBuilder(businessInfo, shortShift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);

      expect(text).toContain('Short:');
      expect(text).toContain('-$50.00');
    });

    it('should handle minimal shift data', () => {
      const minimalShift: ShiftSummary = {
        id: 1,
        openedAt: '2024-12-26T09:00:00Z',
        closedAt: null,
        openedByName: '',
        openingBalanceCents: 0,
        expectedBalanceCents: 0,
        actualBalanceCents: null,
        varianceCents: null,
        cashSalesCents: 0,
        cardSalesCents: 0,
        giftCardSalesCents: 0,
        totalSalesCents: 0,
        transactionCount: 0,
        refundsCents: 0,
      };

      const builder = new ShiftReportBuilder(businessInfo, minimalShift, {});
      const result = builder.build();

      expect(result.length).toBeGreaterThan(0);
    });
  });

  describe('variance formatting', () => {
    it('should format positive variance with plus sign', () => {
      const overShift = createShiftSummary({
        varianceCents: 100,
        actualBalanceCents: 35100,
      });
      const builder = new ShiftReportBuilder(businessInfo, overShift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('+$1.00');
    });

    it('should format negative variance with minus sign', () => {
      const shortShift = createShiftSummary({
        varianceCents: -100,
        actualBalanceCents: 34900,
      });
      const builder = new ShiftReportBuilder(businessInfo, shortShift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      expect(text).toContain('-$1.00');
    });

    it('should format exactly zero variance without sign', () => {
      const builder = new ShiftReportBuilder(businessInfo, shift, config);
      const result = builder.build();

      const text = new TextDecoder().decode(result);
      // Zero variance should be displayed as simple $0.00
      expect(text).toContain('$0.00');
    });
  });
});