switch printing to command pattern

server/src/db/repositories/base-repository.ts

@@ -1,4 +1,5 @@
 import { Knex } from 'knex';
+import logger from '../../logger';
 
 export abstract class BaseRepository<T extends { created_at?: Date; updated_at?: Date }> {
   protected tableName: string;
@@ -16,6 +17,7 @@ export abstract class BaseRepository<T extends { created_at?: Date; updated_at?:
 
   async findById(id: number): Promise<T | null> {
     const result = await this.db(this.tableName).where('id', id).first();
+    logger.info(`findById(${id}) for table ${this.tableName}:`, result);
     return result || null;
   }
 

server/src/db/repositories/step-repository.ts

@@ -1,6 +1,7 @@
 import { Knex } from 'knex';
 import { BaseRepository } from './base-repository';
 import { Step, Task } from '@shared/index';
+import logger from '../../logger';
 
 export class StepRepository extends BaseRepository<Step> {
   constructor(db: Knex) {
@@ -8,10 +9,18 @@ export class StepRepository extends BaseRepository<Step> {
   }
 
   async findByTaskId(taskId: number): Promise<Step[]> {
-    return await this.db(this.tableName)
+    const steps = await this.db(this.tableName)
       .where('task_id', taskId)
       .orderBy('order')
       .select('*');
+
+    logger.info(`Retrieved ${steps.length} steps for task ${taskId}`);
+    for (const step of steps) {
+      logger.info(`Step ${step.id}: name="${step.name}", instructions="${step.instructions}"`);
+      logger.info(`Full step data:`, JSON.stringify(step, null, 2));
+    }
+
+    return steps;
   }
 
   async incrementPrintCount(id: number): Promise<boolean> {

server/src/printer/__tests__/barcode-debug.test.ts

@@ -0,0 +1,98 @@
+import { CommandBuilder } from '../printer-commands';
+import { TestCommandExecutor } from '../command-executor';
+import { BARCODE_CONFIG } from '../printer-constants';
+
+describe('Barcode Debug', () => {
+  let commandExecutor: TestCommandExecutor;
+
+  beforeEach(() => {
+    commandExecutor = new TestCommandExecutor();
+  });
+
+  it('should test different barcode formats', async () => {
+    const testData = '123456789';
+
+    // Test basic barcode
+    const commands = [
+      CommandBuilder.text('Testing barcode:'),
+      CommandBuilder.barcode(testData),
+      CommandBuilder.newline(),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    console.log('Barcode test output:', output);
+    expect(output).toContain('[BARCODE: 123456789]');
+  });
+
+  it('should test task barcode', async () => {
+    const taskId = 123;
+
+    const commands = [
+      CommandBuilder.text('Testing task barcode:'),
+      CommandBuilder.taskBarcode(taskId),
+      CommandBuilder.newline(),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    console.log('Task barcode test output:', output);
+    expect(output).toContain('[BARCODE: 100000123]');
+  });
+
+  it('should test step barcode', async () => {
+    const stepId = 456;
+
+    const commands = [
+      CommandBuilder.text('Testing step barcode:'),
+      CommandBuilder.stepBarcode(stepId),
+      CommandBuilder.newline(),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    console.log('Step barcode test output:', output);
+    expect(output).toContain('[BARCODE: 200000456]');
+  });
+
+  it('should test barcode with alignment', async () => {
+    const testData = '987654321';
+
+    const commands = [
+      CommandBuilder.text('Testing barcode with alignment:'),
+      ...CommandBuilder.barcodeWithAlignment(testData),
+      CommandBuilder.newline(),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    console.log('Barcode with alignment test output:', output);
+    expect(output).toContain('[BARCODE: 987654321]');
+  });
+
+  it('should test task barcode with alignment', async () => {
+    const taskId = 789;
+
+    const commands = [
+      CommandBuilder.text('Testing task barcode with alignment:'),
+      ...CommandBuilder.taskBarcodeWithAlignment(taskId),
+      CommandBuilder.newline(),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    console.log('Task barcode with alignment test output:', output);
+    expect(output).toContain('[BARCODE: 100000789]');
+  });
+
+  it('should test barcode configuration', () => {
+    console.log('Barcode config:', BARCODE_CONFIG);
+    expect(BARCODE_CONFIG.TYPE).toBe('CODE39');
+    expect(BARCODE_CONFIG.ALTERNATIVE_TYPES).toContain('CODE128');
+  });
+});

server/src/printer/__tests__/barcode-utils.test.ts

@@ -0,0 +1,167 @@
+import { BarcodeUtils, BarcodeData } from '../barcode-utils';
+
+describe('BarcodeUtils', () => {
+  describe('parseBarcode', () => {
+    it('should parse valid task barcode', () => {
+      const result = BarcodeUtils.parseBarcode('100000123');
+      expect(result).toEqual({ type: 'TASK', id: 123 });
+    });
+
+    it('should parse valid step barcode', () => {
+      const result = BarcodeUtils.parseBarcode('200000456');
+      expect(result).toEqual({ type: 'STEP', id: 456 });
+    });
+
+    it('should parse barcode with non-numeric characters', () => {
+      const result = BarcodeUtils.parseBarcode('1ABC000123DEF');
+      expect(result).toEqual({ type: 'TASK', id: 123 });
+    });
+
+    it('should return null for invalid entity type', () => {
+      const result = BarcodeUtils.parseBarcode('300000123');
+      expect(result).toBeNull();
+    });
+
+    it('should return null for too short barcode', () => {
+      const result = BarcodeUtils.parseBarcode('1');
+      expect(result).toBeNull();
+    });
+
+    it('should return null for invalid ID', () => {
+      const result = BarcodeUtils.parseBarcode('100000000');
+      expect(result).toBeNull();
+    });
+
+    it('should return null for empty string', () => {
+      const result = BarcodeUtils.parseBarcode('');
+      expect(result).toBeNull();
+    });
+
+    it('should parse large IDs correctly', () => {
+      const result = BarcodeUtils.parseBarcode('199999999');
+      expect(result).toEqual({ type: 'TASK', id: 99999999 });
+    });
+  });
+
+  describe('generateTaskBarcode', () => {
+    it('should generate task barcode', () => {
+      const result = BarcodeUtils.generateTaskBarcode(123);
+      expect(result).toBe('100000123');
+    });
+
+    it('should generate task barcode with padding', () => {
+      const result = BarcodeUtils.generateTaskBarcode(1);
+      expect(result).toBe('100000001');
+    });
+  });
+
+  describe('generateStepBarcode', () => {
+    it('should generate step barcode', () => {
+      const result = BarcodeUtils.generateStepBarcode(456);
+      expect(result).toBe('200000456');
+    });
+
+    it('should generate step barcode with padding', () => {
+      const result = BarcodeUtils.generateStepBarcode(1);
+      expect(result).toBe('200000001');
+    });
+  });
+
+  describe('isValidBarcode', () => {
+    it('should return true for valid task barcode', () => {
+      const result = BarcodeUtils.isValidBarcode('100000123');
+      expect(result).toBe(true);
+    });
+
+    it('should return true for valid step barcode', () => {
+      const result = BarcodeUtils.isValidBarcode('200000456');
+      expect(result).toBe(true);
+    });
+
+    it('should return false for invalid barcode', () => {
+      const result = BarcodeUtils.isValidBarcode('300000123');
+      expect(result).toBe(false);
+    });
+  });
+
+  describe('getEntityType', () => {
+    it('should return TASK for task barcode', () => {
+      const result = BarcodeUtils.getEntityType('100000123');
+      expect(result).toBe('TASK');
+    });
+
+    it('should return STEP for step barcode', () => {
+      const result = BarcodeUtils.getEntityType('200000456');
+      expect(result).toBe('STEP');
+    });
+
+    it('should return null for invalid barcode', () => {
+      const result = BarcodeUtils.getEntityType('300000123');
+      expect(result).toBeNull();
+    });
+  });
+
+  describe('getEntityId', () => {
+    it('should return ID for task barcode', () => {
+      const result = BarcodeUtils.getEntityId('100000123');
+      expect(result).toBe(123);
+    });
+
+    it('should return ID for step barcode', () => {
+      const result = BarcodeUtils.getEntityId('200000456');
+      expect(result).toBe(456);
+    });
+
+    it('should return null for invalid barcode', () => {
+      const result = BarcodeUtils.getEntityId('300000123');
+      expect(result).toBeNull();
+    });
+  });
+
+  describe('getMaxId', () => {
+    it('should return maximum supported ID', () => {
+      const result = BarcodeUtils.getMaxId();
+      expect(result).toBe(99999999);
+    });
+  });
+
+  describe('isValidId', () => {
+    it('should return true for valid ID', () => {
+      const result = BarcodeUtils.isValidId(123);
+      expect(result).toBe(true);
+    });
+
+    it('should return false for zero ID', () => {
+      const result = BarcodeUtils.isValidId(0);
+      expect(result).toBe(false);
+    });
+
+    it('should return false for negative ID', () => {
+      const result = BarcodeUtils.isValidId(-1);
+      expect(result).toBe(false);
+    });
+
+    it('should return false for ID too large', () => {
+      const result = BarcodeUtils.isValidId(100000000);
+      expect(result).toBe(false);
+    });
+  });
+
+  describe('round-trip tests', () => {
+    it('should generate and parse task barcode correctly', () => {
+      const taskId = 789;
+      const generated = BarcodeUtils.generateTaskBarcode(taskId);
+      const parsed = BarcodeUtils.parseBarcode(generated);
+
+      expect(parsed).toEqual({ type: 'TASK', id: taskId });
+    });
+
+    it('should generate and parse step barcode correctly', () => {
+      const stepId = 101;
+      const generated = BarcodeUtils.generateStepBarcode(stepId);
+      const parsed = BarcodeUtils.parseBarcode(generated);
+
+      expect(parsed).toEqual({ type: 'STEP', id: stepId });
+    });
+  });
+});

server/src/printer/__tests__/command-system.test.ts

@@ -0,0 +1,133 @@
+import { CommandBuilder } from '../printer-commands';
+import { TestCommandExecutor } from '../command-executor';
+
+describe('Command System (Standalone)', () => {
+  let commandExecutor: TestCommandExecutor;
+
+  beforeEach(() => {
+    commandExecutor = new TestCommandExecutor();
+  });
+
+  it('should execute text commands', async () => {
+    const commands = [
+      CommandBuilder.text('Hello World'),
+      CommandBuilder.newline(),
+      CommandBuilder.text('Test'),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('Hello World');
+    expect(output).toContain('Test');
+  });
+
+  it('should execute header commands', async () => {
+    const commands = [
+      CommandBuilder.header('Test Header'),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('[ ] Test Header');
+  });
+
+  it('should execute banner commands', async () => {
+    const commands = [
+      CommandBuilder.banner('=', 10),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('==========');
+  });
+
+  it('should execute barcode commands', async () => {
+    const commands = [
+      CommandBuilder.barcode('123456'),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('[BARCODE: 123456]');
+  });
+
+  it('should execute section commands', async () => {
+    const commands = [
+      CommandBuilder.section('Test Section', 'Test Content', '-', true),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('[ ] Test Section');
+    expect(output).toContain('Test Content');
+  });
+
+  it('should execute step header commands', async () => {
+    const commands = [
+      CommandBuilder.stepHeader('Test Step', 1, 'Test Task', true),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('[ ] Step 1: Test Step');
+  });
+
+  it('should execute cut commands', async () => {
+    const commands = [
+      CommandBuilder.cut(true, 4),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('--- CUT ---');
+  });
+
+  it('should execute complex command sequences', async () => {
+    const commands = [
+      CommandBuilder.header('Complex Test'),
+      CommandBuilder.banner('=', 20),
+      CommandBuilder.text('Some content'),
+      CommandBuilder.newline(),
+      CommandBuilder.barcode('123'),
+      CommandBuilder.cut(),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('[ ] Complex Test');
+    expect(output).toContain('====================');
+    expect(output).toContain('Some content');
+    expect(output).toContain('[BARCODE: 123]');
+    expect(output).toContain('--- CUT ---');
+  });
+
+  it('should handle empty command arrays', async () => {
+    const commands: any[] = [];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toBe('\n');
+  });
+
+  it('should handle list commands', async () => {
+    const commands = [
+      CommandBuilder.list(['Item 1', 'Item 2', 'Item 3'], 1, '- '),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('- [ ] 1: Item 1');
+    expect(output).toContain('- [ ] 2: Item 2');
+    expect(output).toContain('- [ ] 3: Item 3');
+  });
+});

server/src/printer/__tests__/format-utils.test.ts

@@ -1,144 +1,51 @@
 import { formatUtils } from '../format-utils';
+import { Command } from '../printer-commands';
 
 describe('formatUtils', () => {
-  describe('createBanner', () => {
-    it('should create a banner with default length', () => {
-      const banner = formatUtils.createBanner('=');
-      expect(banner).toBe('='.repeat(40));
+  it('banner returns a BANNER command', () => {
+    expect(formatUtils.banner('=', 10)).toEqual([Command.BANNER, '=', 10]);
   });
 
-    it('should create a banner with custom length', () => {
-      const banner = formatUtils.createBanner('-', 32);
-      expect(banner).toBe('-'.repeat(32));
+  it('checkbox returns a CHECKBOX command', () => {
+    expect(formatUtils.checkbox('Test')).toEqual([Command.CHECKBOX, 'Test']);
   });
 
-    it('should handle empty character', () => {
-      const banner = formatUtils.createBanner('', 10);
-      expect(banner).toBe('');
+  it('list returns a LIST command', () => {
+    expect(formatUtils.list(['A', 'B'], 1, '- ')).toEqual([[Command.LIST, ['A', 'B'], 1, '- ']]);
   });
 
-    it('should handle zero length', () => {
-      const banner = formatUtils.createBanner('*', 0);
-      expect(banner).toBe('');
-    });
+  it('stepHeader returns a CHECKBOX command with formatted text', () => {
+    expect(formatUtils.stepHeader('StepName', 2, 'TaskName', true)).toEqual([Command.CHECKBOX, 'Step 2: StepName']);
+    expect(formatUtils.stepHeader('StepName', 2, 'TaskName', false)).toEqual([Command.CHECKBOX, 'Step 2 of TaskName: StepName']);
   });
 
-  describe('formatCheckbox', () => {
-    it('should format text with checkbox', () => {
-      const formatted = formatUtils.formatCheckbox('Test Item');
-      expect(formatted).toBe('[ ] Test Item');
-    });
-
-    it('should handle empty text', () => {
-      const formatted = formatUtils.formatCheckbox('');
-      expect(formatted).toBe('[ ] ');
-    });
-
-    it('should handle text with special characters', () => {
-      const formatted = formatUtils.formatCheckbox('Test: Item (123)');
-      expect(formatted).toBe('[ ] Test: Item (123)');
-    });
-  });
-
-  describe('formatList', () => {
-    it('should format list without numbering', () => {
-      const items = ['Item 1', 'Item 2', 'Item 3'];
-      const formatted = formatUtils.formatList(items);
-      expect(formatted).toEqual([
-        '[ ] Item 1',
-        '[ ] Item 2',
-        '[ ] Item 3'
+  it('section returns a list of commands', () => {
+    expect(formatUtils.section('Header', 'Content')).toEqual([
+      [Command.CHECKBOX, 'Header'],
+      [Command.BANNER, '='],
+      [Command.TEXT, 'Content'],
+    ]);
+    expect(formatUtils.section('Header', 'Content', '-', true)).toEqual([
+      [Command.CHECKBOX, 'Header'],
+      [Command.BANNER, '-'],
+      [Command.TEXT, 'Content'],
+      [Command.NEWLINE],
     ]);
   });
 
-    it('should format list with numbering', () => {
-      const items = ['Item 1', 'Item 2', 'Item 3'];
-      const formatted = formatUtils.formatList(items, 1);
-      expect(formatted).toEqual([
-        '[ ] 1: Item 1',
-        '[ ] 2: Item 2',
-        '[ ] 3: Item 3'
+  it('getCheckboxText extracts text from a CHECKBOX command', () => {
+    expect(formatUtils.getCheckboxText([Command.CHECKBOX, 'Hello'])).toBe('Hello');
+    expect(formatUtils.getCheckboxText([Command.BANNER, '='])).toBe('');
+  });
+
+  it('taskHeader returns a CHECKBOX command for the task', () => {
+    expect(formatUtils.taskHeader('My Task')).toEqual([Command.CHECKBOX, 'Task: My Task']);
+  });
+
+  it('taskSection returns a list of commands for the task section', () => {
+    expect(formatUtils.taskSection('My Task')).toEqual([
+      [Command.CHECKBOX, 'Task: My Task'],
+      [Command.BANNER, '='],
     ]);
   });
-
-    it('should handle empty list', () => {
-      const formatted = formatUtils.formatList([]);
-      expect(formatted).toEqual([]);
-    });
-
-    it('should handle list with empty items', () => {
-      const items = ['', 'Item 2', ''];
-      const formatted = formatUtils.formatList(items);
-      expect(formatted).toEqual([
-        '[ ] ',
-        '[ ] Item 2',
-        '[ ] '
-      ]);
-    });
-  });
-
-  describe('formatSection', () => {
-    it('should format section with default banner', () => {
-      const section = formatUtils.formatSection('Header', 'Content');
-      expect(section).toEqual([
-        '[ ] Header',
-        '='.repeat(40),
-        'Content',
-      ]);
-    });
-
-    it('should format section with custom banner', () => {
-      const section = formatUtils.formatSection('Header', 'Content', '-');
-      expect(section).toEqual([
-        '[ ] Header',
-        '-'.repeat(40),
-        'Content',
-      ]);
-    });
-
-    it('should handle empty content', () => {
-      const section = formatUtils.formatSection('Header', '');
-      expect(section).toEqual([
-        '[ ] Header',
-        '='.repeat(40),
-        '',
-      ]);
-    });
-
-    it('should handle empty header', () => {
-      const section = formatUtils.formatSection('', 'Content');
-      expect(section).toEqual([
-        '[ ] ',
-        '='.repeat(40),
-        'Content',
-      ]);
-    });
-  });
-
-  describe('formatStepHeader', () => {
-    it('should format step header with just step name and number', () => {
-      const header = formatUtils.formatStepHeader('Test Step', 1);
-      expect(header).toBe('Step 1: Test Step');
-    });
-
-    it('should format step header with step number and task name in single step view', () => {
-      const header = formatUtils.formatStepHeader('Test Step', 1, 'Test Task');
-      expect(header).toBe('Step 1 of Test Task: Test Step');
-    });
-
-    it('should format step header with step number but no task name in task view', () => {
-      const header = formatUtils.formatStepHeader('Test Step', 1, 'Test Task', true);
-      expect(header).toBe('Step 1: Test Step');
-    });
-
-    it('should handle empty step name', () => {
-      const header = formatUtils.formatStepHeader('', 1);
-      expect(header).toBe('Step 1: ');
-    });
-
-    it('should handle zero step number', () => {
-      const header = formatUtils.formatStepHeader('Test Step', 0);
-      expect(header).toBe('Step 0: Test Step');
-    });
-  });
 });

server/src/printer/__tests__/printer.test.ts

@@ -3,6 +3,8 @@ import { TestPrinter } from '../index';
 import { Task, Step } from '@shared/index';
 import { InMemoryPrintHistoryRepository, InMemoryStepRepository } from '../../db/repositories/in-memory-repository';
 import { Knex } from 'knex';
+import { CommandBuilder } from '../printer-commands';
+import { TestCommandExecutor } from '../command-executor';
 
 describe('Printer', () => {
   let printHistoryRepo: InMemoryPrintHistoryRepository;
@@ -41,3 +43,112 @@ describe('Printer', () => {
     });
   });
 });
+
+describe('Command System', () => {
+  let commandExecutor: TestCommandExecutor;
+
+  beforeEach(() => {
+    commandExecutor = new TestCommandExecutor();
+  });
+
+  it('should execute text commands', async () => {
+    const commands = [
+      CommandBuilder.text('Hello World'),
+      CommandBuilder.newline(),
+      CommandBuilder.text('Test'),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('Hello World');
+    expect(output).toContain('Test');
+  });
+
+  it('should execute header commands', async () => {
+    const commands = [
+      CommandBuilder.header('Test Header'),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('[ ] Test Header');
+  });
+
+  it('should execute banner commands', async () => {
+    const commands = [
+      CommandBuilder.banner('=', 10),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('==========');
+  });
+
+  it('should execute barcode commands', async () => {
+    const commands = [
+      CommandBuilder.barcode('123456'),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('[BARCODE: 123456]');
+  });
+
+  it('should execute section commands', async () => {
+    const commands = [
+      CommandBuilder.section('Test Section', 'Test Content', '-', true),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('[ ] Test Section');
+    expect(output).toContain('Test Content');
+  });
+
+  it('should execute step header commands', async () => {
+    const commands = [
+      CommandBuilder.stepHeader('Test Step', 1, 'Test Task', true),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('[ ] Step 1: Test Step');
+  });
+
+  it('should execute cut commands', async () => {
+    const commands = [
+      CommandBuilder.cut(true, 4),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('--- CUT ---');
+  });
+
+  it('should execute complex command sequences', async () => {
+    const commands = [
+      CommandBuilder.header('Complex Test'),
+      CommandBuilder.banner('=', 20),
+      CommandBuilder.text('Some content'),
+      CommandBuilder.newline(),
+      CommandBuilder.barcode('123'),
+      CommandBuilder.cut(),
+    ];
+
+    await commandExecutor.executeCommands(commands);
+    const output = commandExecutor.getOutput();
+
+    expect(output).toContain('[ ] Complex Test');
+    expect(output).toContain('====================');
+    expect(output).toContain('Some content');
+    expect(output).toContain('[BARCODE: 123]');
+    expect(output).toContain('--- CUT ---');
+  });
+});

server/src/printer/__tests__/step-data-debug.test.ts

@@ -0,0 +1,51 @@
+import { Step } from '@shared/index';
+
+describe('Step Data Debug', () => {
+  it('should test step data structure', () => {
+    // Test with sample step data that matches the database
+    const step: Step = {
+      id: 10,
+      name: 'Counter',
+      instructions: 'Was hit',
+      task_id: 20,
+      order: 1,
+      print_count: 9,
+      created_at: new Date('2025-06-15T01:55:41.121Z'),
+      updated_at: new Date('2025-06-15T01:55:41.121Z'),
+    };
+
+    console.log(`Step ${step.id}:`);
+    console.log(`  name: "${step.name}"`);
+    console.log(`  instructions: "${step.instructions}"`);
+    console.log(`  task_id: ${step.task_id}`);
+    console.log(`  order: ${step.order}`);
+    console.log(`  print_count: ${step.print_count}`);
+    console.log(`  created_at: ${step.created_at}`);
+    console.log(`  updated_at: ${step.updated_at}`);
+
+    expect(step.instructions).toBe('Was hit');
+    expect(typeof step.instructions).toBe('string');
+  });
+
+  it('should test step data with different instructions', () => {
+    const step: Step = {
+      id: 11,
+      name: 'Sink',
+      instructions: 'asdf',
+      task_id: 20,
+      order: 2,
+      print_count: 2,
+      created_at: new Date('2025-06-15T01:55:46.466Z'),
+      updated_at: new Date('2025-06-15T01:55:46.466Z'),
+    };
+
+    console.log(`Step ${step.id}:`);
+    console.log(`  name: "${step.name}"`);
+    console.log(`  instructions: "${step.instructions}"`);
+    console.log(`  task_id: ${step.task_id}`);
+    console.log(`  order: ${step.order}`);
+
+    expect(step.instructions).toBe('asdf');
+    expect(typeof step.instructions).toBe('string');
+  });
+});

server/src/printer/barcode-utils.ts

@@ -0,0 +1,106 @@
+export interface BarcodeData {
+  type: 'TASK' | 'STEP';
+  id: number;
+}
+
+export class BarcodeUtils {
+  // Entity type codes - using numeric prefixes
+  private static readonly TASK_PREFIX = 1;
+  private static readonly STEP_PREFIX = 2;
+
+  // Format: [entity_type][padding][id]
+  // Example: 100000123 for task 123, 200000456 for step 456
+  private static readonly ID_PADDING = 4; // 4 digits for ID
+
+  /**
+   * Parse barcode data to extract entity type and ID
+   * @param barcodeData The raw barcode data (e.g., "100000123" or "200000456")
+   * @returns Parsed barcode data with type and ID, or null if invalid
+   */
+  static parseBarcode(barcodeData: string): BarcodeData | null {
+    const numericData = barcodeData.replace(/\D/g, ''); // Remove non-digits
+
+    if (numericData.length < 2) {
+      return null;
+    }
+
+    const entityType = parseInt(numericData.charAt(0), 10);
+    const id = parseInt(numericData.substring(1), 10);
+
+    if (isNaN(id) || id <= 0) {
+      return null;
+    }
+
+    if (entityType === this.TASK_PREFIX) {
+      return { type: 'TASK', id };
+    } else if (entityType === this.STEP_PREFIX) {
+      return { type: 'STEP', id };
+    }
+
+    return null;
+  }
+
+  /**
+   * Generate barcode data for a task
+   * @param taskId The task ID
+   * @returns Formatted barcode data (numeric only)
+   */
+  static generateTaskBarcode(taskId: number): string {
+    return `${this.TASK_PREFIX}${taskId.toString().padStart(this.ID_PADDING, '0')}`;
+  }
+
+  /**
+   * Generate barcode data for a step
+   * @param stepId The step ID
+   * @returns Formatted barcode data (numeric only)
+   */
+  static generateStepBarcode(stepId: number): string {
+    return `${this.STEP_PREFIX}${stepId.toString().padStart(this.ID_PADDING, '0')}`;
+  }
+
+  /**
+   * Validate if a barcode data string is valid
+   * @param barcodeData The barcode data to validate
+   * @returns True if valid, false otherwise
+   */
+  static isValidBarcode(barcodeData: string): boolean {
+    return this.parseBarcode(barcodeData) !== null;
+  }
+
+  /**
+   * Get the entity type from barcode data
+   * @param barcodeData The barcode data
+   * @returns The entity type or null if invalid
+   */
+  static getEntityType(barcodeData: string): 'TASK' | 'STEP' | null {
+    const parsed = this.parseBarcode(barcodeData);
+    return parsed?.type || null;
+  }
+
+  /**
+   * Get the entity ID from barcode data
+   * @param barcodeData The barcode data
+   * @returns The entity ID or null if invalid
+   */
+  static getEntityId(barcodeData: string): number | null {
+    const parsed = this.parseBarcode(barcodeData);
+    return parsed?.id || null;
+  }
+
+  /**
+   * Get the maximum supported ID for the current format
+   * @returns Maximum ID value
+   */
+  static getMaxId(): number {
+    return Math.pow(10, this.ID_PADDING) - 1;
+  }
+
+  /**
+   * Check if an ID is within the supported range
+   * @param id The ID to check
+   * @returns True if valid, false otherwise
+   */
+  static isValidId(id: number): boolean {
+    return id > 0 && id <= this.getMaxId();
+  }
+}

server/src/printer/command-executor.ts

@@ -0,0 +1,266 @@
+import { Printer as EscposPrinter } from '@node-escpos/core';
+import { formatUtils } from './format-utils';
+import { Command, CommandTuple, CommandArray } from './printer-commands';
+import { FONT_SIZES, ALIGNMENT, FONT, STYLE, BARCODE_CONFIG } from './printer-constants';
+import logger from '../logger';
+
+export interface CommandExecutor {
+  executeCommands(commands: CommandArray): Promise<void>;
+}
+
+export class SerialCommandExecutor implements CommandExecutor {
+  constructor(private printer: EscposPrinter<[]>) {}
+
+  async executeCommands(commands: CommandArray): Promise<void> {
+    for (const command of commands) {
+      await this.executeCommand(command);
+    }
+  }
+
+  private async executeCommand(commandTuple: CommandTuple): Promise<void> {
+    const [command, ...params] = commandTuple;
+
+    switch (command) {
+      case Command.TEXT:
+        await this.printer.text(params[0] as string);
+        break;
+
+      case Command.HEADER:
+        await this.printer
+          .font(FONT.DEFAULT)
+          .align(ALIGNMENT.CENTER)
+          .style(STYLE.BOLD)
+          .size(FONT_SIZES.LARGE.width, FONT_SIZES.LARGE.height)
+          .text(formatUtils.getCheckboxText(formatUtils.checkbox(params[0] as string)));
+        break;
+
+      case Command.BANNER:
+        const char = params[0] as string;
+        const length = params[1] as number;
+        await this.printer.text(formatUtils.bannerString(char, length));
+        break;
+
+      case Command.NEWLINE:
+        await this.printer.text('');
+        break;
+
+      case Command.BARCODE:
+        const barcodeData = params[0] as string;
+        logger.info(`Printing barcode: ${barcodeData} with type: ${BARCODE_CONFIG.TYPE}`);
+
+        // Try multiple barcode formats until one works
+        const barcodeTypes = [BARCODE_CONFIG.TYPE, ...BARCODE_CONFIG.ALTERNATIVE_TYPES];
+        let barcodePrinted = false;
+
+        for (const barcodeType of barcodeTypes) {
+          try {
+            logger.info(`Trying barcode type: ${barcodeType}`);
+            await this.printer.barcode(
+              barcodeData,
+              barcodeType,
+              BARCODE_CONFIG.DIMENSIONS
+            );
+            logger.info(`Successfully printed barcode with type: ${barcodeType}`);
+            barcodePrinted = true;
+            break;
+          } catch (error) {
+            logger.warn(`Barcode type ${barcodeType} failed: ${error}`);
+            continue;
+          }
+        }
+
+        if (!barcodePrinted) {
+          logger.error(`All barcode types failed for data: ${barcodeData}`);
+          // As a last resort, just print the data as text
+          await this.printer.text(`[BARCODE: ${barcodeData}]`);
+        }
+        break;
+
+      case Command.FONT_SIZE:
+        const size = params[0] as typeof FONT_SIZES[keyof typeof FONT_SIZES];
+        await this.printer.size(size.width, size.height);
+        break;
+
+      case Command.ALIGN:
+        await this.printer.align(params[0] as any);
+        break;
+
+      case Command.FONT_FAMILY:
+        await this.printer.font(params[0] as any);
+        break;
+
+      case Command.STYLE:
+        await this.printer.style(params[0] as any);
+        break;
+
+      case Command.CUT:
+        const partial = params[0] as boolean;
+        const lines = params[1] as number;
+        await this.printer.cut(partial, lines);
+        break;
+
+      case Command.SECTION:
+        const header = params[0] as string;
+        const content = params[1] as string;
+        const bannerChar = params[2] as string;
+        const trailingNewline = params[3] as boolean;
+        const section = formatUtils.section(header, content, bannerChar, trailingNewline);
+        for (const cmd of section) {
+          if (cmd[0] === Command.CHECKBOX || cmd[0] === Command.TEXT) {
+            await this.printer.text(cmd[1] as string);
+          } else if (cmd[0] === Command.BANNER) {
+            await this.printer.text(formatUtils.bannerString(cmd[1] as string, cmd[2] as number));
+          } else if (cmd[0] === Command.NEWLINE) {
+            await this.printer.text('');
+          }
+        }
+        break;
+
+      case Command.STEP_HEADER:
+        const stepName = params[0] as string;
+        const stepNumber = params[1] as number;
+        const taskName = params[2] as string;
+        const isTaskView = params[3] as boolean;
+        const stepHeader = formatUtils.stepHeader(stepName, stepNumber, taskName, isTaskView);
+        await this.printer.text(formatUtils.getCheckboxText(stepHeader));
+        break;
+
+      case Command.CHECKBOX:
+        await this.printer.text(formatUtils.getCheckboxText(formatUtils.checkbox(params[0] as string)));
+        break;
+
+      case Command.LIST:
+        const items = params[0] as string[];
+        const startIndex = params[1] as number;
+        const prefix = params[2] as string;
+        const listCmds = formatUtils.list(items, startIndex, prefix);
+        for (const cmd of listCmds) {
+          if (cmd[0] === Command.LIST) {
+            // Render as text for test printer, or as needed for real printer
+            for (let i = 0; i < items.length; i++) {
+              const num = startIndex > 0 ? `${i + startIndex}: ` : '';
+              const body = formatUtils.getCheckboxText(formatUtils.checkbox(`${num}${items[i]}`));
+              await this.printer.text(`${prefix}${body}`);
+            }
+          }
+        }
+        break;
+
+      default:
+        throw new Error(`Unknown command: ${command}`);
+    }
+  }
+}
+
+export class TestCommandExecutor implements CommandExecutor {
+  private output: string[] = [];
+
+  async executeCommands(commands: CommandArray): Promise<void> {
+    this.output = [];
+
+    for (const command of commands) {
+      await this.executeCommand(command);
+    }
+  }
+
+  private async executeCommand(commandTuple: CommandTuple): Promise<void> {
+    const [command, ...params] = commandTuple;
+
+    switch (command) {
+      case Command.TEXT:
+        this.output.push(params[0] as string);
+        break;
+
+      case Command.HEADER:
+        this.output.push(formatUtils.getCheckboxText(formatUtils.checkbox(params[0] as string)));
+        break;
+
+      case Command.BANNER:
+        const char = params[0] as string;
+        const length = params[1] as number;
+        this.output.push(formatUtils.banner(char, length)[1] as string);
+        break;
+
+      case Command.NEWLINE:
+        this.output.push('');
+        break;
+
+      case Command.BARCODE:
+        this.output.push(`[BARCODE: ${params[0] as string}]`);
+        break;
+
+      case Command.FONT_SIZE:
+        // Test printer ignores font size changes
+        break;
+
+      case Command.ALIGN:
+        // Test printer ignores alignment changes
+        break;
+
+      case Command.FONT_FAMILY:
+        // Test printer ignores font changes
+        break;
+
+      case Command.STYLE:
+        // Test printer ignores style changes
+        break;
+
+      case Command.CUT:
+        this.output.push('--- CUT ---');
+        break;
+
+      case Command.SECTION:
+        const header = params[0] as string;
+        const content = params[1] as string;
+        const bannerChar = params[2] as string;
+        const trailingNewline = params[3] as boolean;
+        const section = formatUtils.section(header, content, bannerChar, trailingNewline);
+        for (const cmd of section) {
+          if (cmd[0] === Command.CHECKBOX || cmd[0] === Command.TEXT) {
+            this.output.push(cmd[1] as string);
+          } else if (cmd[0] === Command.BANNER) {
+            this.output.push(formatUtils.bannerString(cmd[1] as string, cmd[2] as number));
+          } else if (cmd[0] === Command.NEWLINE) {
+            this.output.push('');
+          }
+        }
+        break;
+
+      case Command.STEP_HEADER:
+        const stepName = params[0] as string;
+        const stepNumber = params[1] as number;
+        const taskName = params[2] as string;
+        const isTaskView = params[3] as boolean;
+        const stepHeader = formatUtils.stepHeader(stepName, stepNumber, taskName, isTaskView);
+        this.output.push(formatUtils.getCheckboxText(stepHeader));
+        break;
+
+      case Command.CHECKBOX:
+        this.output.push(formatUtils.getCheckboxText(formatUtils.checkbox(params[0] as string)));
+        break;
+
+      case Command.LIST:
+        const items = params[0] as string[];
+        const startIndex = params[1] as number;
+        const prefix = params[2] as string;
+        const listCmds = formatUtils.list(items, startIndex, prefix);
+        for (const cmd of listCmds) {
+          if (cmd[0] === Command.LIST) {
+            for (let i = 0; i < items.length; i++) {
+              const num = startIndex > 0 ? `${i + startIndex}: ` : '';
+              const body = formatUtils.getCheckboxText(formatUtils.checkbox(`${num}${items[i]}`));
+              this.output.push(`${prefix}${body}`);
+            }
+          }
+        }
+        break;
+
+      default:
+        throw new Error(`Unknown command: ${command}`);
+    }
+  }
+
+  getOutput(): string {
+    return this.output.join('\n') + '\n';
+  }
+}

server/src/printer/format-utils.ts

@@ -1,48 +1,39 @@
 import { PAPER_CONFIG } from "./printer-constants";
+import { Command, CommandTuple } from './printer-commands';
 
 export const formatUtils = {
   /**
-   * Creates a banner line with the specified character
-   * @param char Character to repeat
-   * @param length Length of the banner
-   * @returns Formatted banner string
+   * Creates a banner command
    */
-  createBanner(char: string, length: number = PAPER_CONFIG.BANNER_LENGTH): string {
+  banner(char: string, length: number = PAPER_CONFIG.BANNER_LENGTH): CommandTuple {
+    return [Command.BANNER, char, length];
+  },
+
+  /**
+   * Creates a banner string (repeated character)
+   */
+  bannerString(char: string, length: number = PAPER_CONFIG.BANNER_LENGTH): string {
     return char.repeat(length);
   },
 
   /**
-   * Formats a checkbox item with the given text
-   * @param text Text to display after the checkbox
-   * @returns Formatted checkbox string
+   * Checkbox command
    */
-  formatCheckbox(text: string): string {
-    return `[ ] ${text}`;
+  checkbox(text: string): CommandTuple {
+    return [Command.CHECKBOX, text];
   },
 
   /**
-   * Formats a list of items into lines with optional numbering
-   * @param items List of items to format
-   * @param startIndex Starting index for numbering (0 for no numbers)
-   * @returns Array of formatted lines
+   * List of items as commands
    */
-  formatList(items: string[], startIndex: number = 0, prefix: string = ''): string[] {
-    return items.map((item, index) => {
-      const num = startIndex > 0 ? `${index + startIndex}: ` : '';
-      const body = this.formatCheckbox(`${num}${item}`);
-      return `${prefix}${body}`;
-    });
+  list(items: string[], startIndex: number = 0, prefix: string = ''): CommandTuple[] {
+    return [[Command.LIST, items, startIndex, prefix]];
   },
 
   /**
-   * Formats a step header with task context
-   * @param stepName Name of the step
-   * @param stepNumber Step number (1-based)
-   * @param taskName Name of the parent task (only used in single step view)
-   * @param isTaskView Whether this is being used in a task view
-   * @returns Formatted step header
+   * Step header as a command
    */
-  formatStepHeader(stepName: string, stepNumber: number, taskName?: string, isTaskView: boolean = false): string {
+  stepHeader(stepName: string, stepNumber: number, taskName?: string, isTaskView: boolean = false): CommandTuple {
     const parts = ['Step'];
     if (stepNumber !== undefined) {
       parts.push(' ');
@@ -53,25 +44,48 @@ export const formatUtils = {
     }
     parts.push(': ');
     parts.push(stepName);
-    return parts.join('');
+    return [Command.CHECKBOX, parts.join('')];
   },
 
   /**
-   * Formats a section with a header and content
-   * @param header Section header
-   * @param content Section content
-   * @param bannerChar Character to use for the banner
-   * @returns Array of formatted lines
+   * Section as a list of commands
    */
-  formatSection(header: string, content: string, bannerChar: string = '=', trailingNewline: boolean = false): string[] {
-    const parts = [
-      this.formatCheckbox(header),
-      this.createBanner(bannerChar),
-      content,
+  section(header: string, content: string, bannerChar: string = '=', trailingNewline: boolean = false): CommandTuple[] {
+    const commands: CommandTuple[] = [
+      [Command.CHECKBOX, header],
+      [Command.BANNER, bannerChar],
+      [Command.TEXT, content],
     ];
     if (trailingNewline) {
-      parts.push('');
+      commands.push([Command.NEWLINE]);
     }
-    return parts;
+    return commands;
+  },
+
+  /**
+   * Extracts the text from a CHECKBOX CommandTuple
+   */
+  getCheckboxText(cmd: CommandTuple): string {
+    if (cmd[0] === Command.CHECKBOX && typeof cmd[1] === 'string') {
+      return cmd[1];
     }
+    return '';
+  },
+
+  /**
+   * Task header as a command
+   */
+  taskHeader(taskName: string): CommandTuple {
+    return [Command.CHECKBOX, `Task: ${taskName}`];
+  },
+
+  /**
+   * Task section as a list of commands
+   */
+  taskSection(taskName: string): CommandTuple[] {
+    return [
+      [Command.CHECKBOX, `Task: ${taskName}`],
+      [Command.BANNER, '='],
+    ];
+  },
 };

server/src/printer/index.ts

@@ -16,3 +16,6 @@ export function createPrinter(printHistoryRepo: PrintHistoryRepository, stepRepo
 
 export { SerialPrinter } from './serial-printer';
 export { TestPrinter } from './test-printer';
+export { CommandBuilder, Command, type CommandArray, type CommandTuple } from './printer-commands';
+export { SerialCommandExecutor, TestCommandExecutor, type CommandExecutor } from './command-executor';
+export { BarcodeUtils, type BarcodeData } from './barcode-utils';

server/src/printer/printer-commands.ts

@@ -0,0 +1,148 @@
+import { FONT_SIZES, ALIGNMENT, FONT, STYLE, BARCODE_CONFIG, PAPER_CONFIG } from './printer-constants';
+import { BarcodeUtils } from './barcode-utils';
+
+// Command types for printer operations
+export enum Command {
+  // Text commands
+  TEXT = 'TEXT',
+  HEADER = 'HEADER',
+  BANNER = 'BANNER',
+  NEWLINE = 'NEWLINE',
+
+  // Barcode commands
+  BARCODE = 'BARCODE',
+
+  // Formatting commands
+  FONT_SIZE = 'FONT_SIZE',
+  ALIGN = 'ALIGN',
+  FONT_FAMILY = 'FONT_FAMILY',
+  STYLE = 'STYLE',
+
+  // Paper commands
+  CUT = 'CUT',
+
+  // Section formatting
+  SECTION = 'SECTION',
+  STEP_HEADER = 'STEP_HEADER',
+  CHECKBOX = 'CHECKBOX',
+
+  // List formatting
+  LIST = 'LIST',
+}
+
+// Command parameter types
+export type FontSize = typeof FONT_SIZES[keyof typeof FONT_SIZES];
+export type Alignment = typeof ALIGNMENT[keyof typeof ALIGNMENT];
+export type FontFamily = typeof FONT[keyof typeof FONT];
+export type TextStyle = typeof STYLE[keyof typeof STYLE];
+
+// Command tuple type - [Command, ...parameters]
+export type CommandTuple =
+  | [Command.TEXT, string]
+  | [Command.HEADER, string]
+  | [Command.BANNER, string, number?]
+  | [Command.NEWLINE]
+  | [Command.BARCODE, string]
+  | [Command.FONT_SIZE, FontSize]
+  | [Command.ALIGN, Alignment]
+  | [Command.FONT_FAMILY, FontFamily]
+  | [Command.STYLE, TextStyle]
+  | [Command.CUT, boolean, number?]
+  | [Command.SECTION, string, string, string?, boolean?]
+  | [Command.STEP_HEADER, string, number, string?, boolean?]
+  | [Command.CHECKBOX, string]
+  | [Command.LIST, string[], number?, string?];
+
+// Command array type
+export type CommandArray = CommandTuple[];
+
+// Command builder utility
+export class CommandBuilder {
+  static text(text: string): CommandTuple {
+    return [Command.TEXT, text];
+  }
+
+  static header(text: string): CommandTuple {
+    return [Command.HEADER, text];
+  }
+
+  static banner(char: string = '=', length?: number): CommandTuple {
+    return [Command.BANNER, char, length];
+  }
+
+  static newline(): CommandTuple {
+    return [Command.NEWLINE];
+  }
+
+  static barcode(data: string): CommandTuple {
+    return [Command.BARCODE, data];
+  }
+
+  static taskBarcode(taskId: number): CommandTuple {
+    return [Command.BARCODE, BarcodeUtils.generateTaskBarcode(taskId)];
+  }
+
+  static stepBarcode(stepId: number): CommandTuple {
+    return [Command.BARCODE, BarcodeUtils.generateStepBarcode(stepId)];
+  }
+
+  static barcodeWithAlignment(data: string, alignment: Alignment = ALIGNMENT.CENTER): CommandTuple[] {
+    return [
+      [Command.ALIGN, alignment],
+      [Command.BARCODE, data],
+      [Command.ALIGN, ALIGNMENT.LEFT], // Reset to left alignment
+    ];
+  }
+
+  static taskBarcodeWithAlignment(taskId: number, alignment: Alignment = ALIGNMENT.CENTER): CommandTuple[] {
+    return [
+      [Command.ALIGN, alignment],
+      [Command.BARCODE, BarcodeUtils.generateTaskBarcode(taskId)],
+      [Command.ALIGN, ALIGNMENT.LEFT], // Reset to left alignment
+    ];
+  }
+
+  static stepBarcodeWithAlignment(stepId: number, alignment: Alignment = ALIGNMENT.CENTER): CommandTuple[] {
+    return [
+      [Command.ALIGN, alignment],
+      [Command.BARCODE, BarcodeUtils.generateStepBarcode(stepId)],
+      [Command.ALIGN, ALIGNMENT.LEFT], // Reset to left alignment
+    ];
+  }
+
+  static fontSize(size: FontSize): CommandTuple {
+    return [Command.FONT_SIZE, size];
+  }
+
+  static align(alignment: Alignment): CommandTuple {
+    return [Command.ALIGN, alignment];
+  }
+
+  static font(font: FontFamily): CommandTuple {
+    return [Command.FONT_FAMILY, font];
+  }
+
+  static style(style: TextStyle): CommandTuple {
+    return [Command.STYLE, style];
+  }
+
+  static cut(partial: boolean = true, lines: number = PAPER_CONFIG.CUT_LINES): CommandTuple {
+    return [Command.CUT, partial, lines];
+  }
+
+  static section(header: string, content: string, bannerChar: string = '=', trailingNewline: boolean = false): CommandTuple {
+    return [Command.SECTION, header, content, bannerChar, trailingNewline];
+  }
+
+  static stepHeader(stepName: string, stepNumber: number, taskName?: string, isTaskView: boolean = false): CommandTuple {
+    return [Command.STEP_HEADER, stepName, stepNumber, taskName, isTaskView];
+  }
+
+  static checkbox(text: string): CommandTuple {
+    return [Command.CHECKBOX, text];
+  }
+
+  static list(items: string[], startIndex: number = 0, prefix: string = ''): CommandTuple {
+    return [Command.LIST, items, startIndex, prefix];
+  }
+}

server/src/printer/printer-constants.ts

@@ -5,13 +5,14 @@ export const PRINTER_CONFIG = {
 
 export const FONT_SIZES = {
   NORMAL: { width: 1, height: 1 },  // 0.08 x 2.13 mm
-  SMALL: { width: 1, height: 1 },   // Same as normal for now, but can be adjusted if needed
+  SMALL: { width: 0.5, height: 0.5 }, // Half size
   LARGE: { width: 2, height: 2 },   // Double size
 } as const;
 
 export const BARCODE_CONFIG = {
-  TYPE: 'CODE128',
+  TYPE: 'CODE39',
   DIMENSIONS: { width: 2, height: 50 },
+  ALTERNATIVE_TYPES: ['CODE128', 'EAN13', 'UPC_A'] as const,
 } as const;
 
 export const PAPER_CONFIG = {

server/src/printer/serial-printer.ts

@@ -5,6 +5,8 @@ import { StepRepository, PrintHistoryRepository } from '../db/repositories';
 import { Knex } from 'knex';
 import logger from '../logger';
 import { formatUtils } from './format-utils';
+import { CommandBuilder } from './printer-commands';
+import { SerialCommandExecutor } from './command-executor';
 import {
   PRINTER_CONFIG,
   FONT_SIZES,
@@ -20,6 +22,7 @@ export class SerialPrinter implements PrinterInterface {
   private printer: Printer<[]> | null = null;
   private printHistoryRepo: PrintHistoryRepository;
   private stepRepository: StepRepository;
+  private commandExecutor: SerialCommandExecutor | null = null;
 
   constructor(printHistoryRepo: PrintHistoryRepository, stepRepo: StepRepository) {
     this.printHistoryRepo = printHistoryRepo;
@@ -32,6 +35,7 @@ export class SerialPrinter implements PrinterInterface {
       this.device = new USB();
       const options = { encoding: PRINTER_CONFIG.ENCODING };
       this.printer = new Printer(this.device, options);
+      this.commandExecutor = new SerialCommandExecutor(this.printer);
       logger.info('Printer device initialized successfully');
     } catch (error) {
       logger.error('Failed to initialize printer device:', error);
@@ -80,58 +84,51 @@ export class SerialPrinter implements PrinterInterface {
   }
 
   async printTask(task: Task, db: Knex): Promise<void> {
-    if (!this.printer || !this.device) {
+    if (!this.commandExecutor) {
       throw new Error('Printer not initialized');
     }
 
     const taskSteps = await this.getTaskSteps(db, task);
+    logger.info(`Printing task ${task.id} with ${taskSteps.length} steps`);
 
     try {
       await this.openPrinter();
 
-      // Print header with task ID as barcode
-      await this.printer
-        .font(FONT.DEFAULT)
-        .align(ALIGNMENT.CENTER)
-        .style(STYLE.BOLD)
-        .size(FONT_SIZES.LARGE.width, FONT_SIZES.LARGE.height)
-        .text(formatUtils.formatCheckbox(`Task: ${task.name}`))
-        .text(formatUtils.createBanner('=', PAPER_CONFIG.BANNER_LENGTH))
-        // .text('')
-        .align(ALIGNMENT.LEFT);
+      const commands = [
+        // Header with task name
+        CommandBuilder.header(`Task: ${task.name}`),
+        CommandBuilder.banner('=', PAPER_CONFIG.BANNER_LENGTH),
+        CommandBuilder.align(ALIGNMENT.LEFT),
 
-      // Print task ID as barcode
-      await this.printer
-        .barcode(task.id.toString(), BARCODE_CONFIG.TYPE, BARCODE_CONFIG.DIMENSIONS);
-        // .text('')
-        // .text('');
+        // Task ID as barcode
+        ...CommandBuilder.taskBarcodeWithAlignment(task.id),
+        CommandBuilder.newline(),
+        CommandBuilder.newline(),
+      ];
 
-      // Print steps
+      // Add steps
       for (let i = 0; i < taskSteps.length; i++) {
         const step = taskSteps[i];
-        const stepSection = formatUtils.formatSection(
-          formatUtils.formatStepHeader(step.name, i + 1, task.name, true),
+        logger.info(`Printing step ${step.id}: name="${step.name}", instructions="${step.instructions}"`);
+
+        const headerText = formatUtils.getCheckboxText(formatUtils.stepHeader(step.name, i + 1, task.name, true));
+        commands.push(
+          CommandBuilder.fontSize(FONT_SIZES.NORMAL),
+          CommandBuilder.text(headerText),
+          ...formatUtils.section(
+            '',
             step.instructions || 'No instructions provided',
             '-'
+          ),
+          CommandBuilder.newline(),
+          ...CommandBuilder.stepBarcodeWithAlignment(step.id),
+          CommandBuilder.newline()
         );
-
-        await this.printer
-          .size(FONT_SIZES.NORMAL.width, FONT_SIZES.NORMAL.height)
-          .text(stepSection[0])
-          .text(stepSection[1])
-          .size(FONT_SIZES.SMALL.width, FONT_SIZES.SMALL.height)
-          .text(stepSection[3]);
-          // .text('');
-
-        // Print step ID as barcode
-        await this.printer
-          .barcode(step.id.toString(), BARCODE_CONFIG.TYPE, BARCODE_CONFIG.DIMENSIONS);
-        // .text('');
       }
 
-      await this.printer
-        .cut(true, PAPER_CONFIG.CUT_LINES);
+      commands.push(CommandBuilder.cut(true, PAPER_CONFIG.CUT_LINES));
 
+      await this.commandExecutor.executeCommands(commands);
       await this.closePrinter();
 
       logger.info(`Printed task ${task.id}`);
@@ -148,10 +145,12 @@ export class SerialPrinter implements PrinterInterface {
   }
 
   async printStep(step: Step, db: Knex): Promise<void> {
-    if (!this.printer || !this.device) {
+    if (!this.commandExecutor) {
       throw new Error('Printer not initialized');
     }
 
+    logger.info(`Printing step ${step.id}: name="${step.name}", instructions="${step.instructions}"`);
+
     try {
       await this.openPrinter();
 
@@ -159,30 +158,30 @@ export class SerialPrinter implements PrinterInterface {
       const task = await this.stepRepository.findTaskById(step.id);
       const stepNumber = await this.stepRepository.findStepNumber(step.id);
 
-      const stepSection = formatUtils.formatSection(
-        formatUtils.formatStepHeader(step.name, stepNumber, task?.name),
-        step.instructions || 'No instructions provided'
+      const headerText = formatUtils.getCheckboxText(formatUtils.stepHeader(step.name, stepNumber, task?.name));
+      const stepSection = formatUtils.section(
+        headerText,
+        step.instructions || 'No instructions provided',
+        '-'
       );
 
-      await this.printer
-        .font(FONT.DEFAULT)
-        .align(ALIGNMENT.CENTER)
-        .style(STYLE.BOLD)
-        .size(FONT_SIZES.LARGE.width, FONT_SIZES.LARGE.height)
-        .text(stepSection[0])
-        .text(stepSection[1])
-        .text('')
-        .align(ALIGNMENT.LEFT)
-        .size(FONT_SIZES.NORMAL.width, FONT_SIZES.NORMAL.height)
-        .text(stepSection[3])
-        .text('')
-        .text('');
-
-      // Print step ID as barcode
-      await this.printer
-        .barcode(step.id.toString(), BARCODE_CONFIG.TYPE, BARCODE_CONFIG.DIMENSIONS)
-        .cut(true, PAPER_CONFIG.CUT_LINES);
+      const commands = [
+        CommandBuilder.font(FONT.DEFAULT),
+        CommandBuilder.align(ALIGNMENT.CENTER),
+        CommandBuilder.style(STYLE.BOLD),
+        CommandBuilder.fontSize(FONT_SIZES.NORMAL),
+        CommandBuilder.text(headerText),
+        CommandBuilder.newline(),
+        CommandBuilder.align(ALIGNMENT.LEFT),
+        CommandBuilder.fontSize(FONT_SIZES.NORMAL),
+        CommandBuilder.text(step.instructions || 'No instructions provided'),
+        CommandBuilder.newline(),
+        CommandBuilder.newline(),
+        ...CommandBuilder.stepBarcodeWithAlignment(step.id),
+        CommandBuilder.cut(true, PAPER_CONFIG.CUT_LINES),
+      ];
 
+      await this.commandExecutor.executeCommands(commands);
       await this.closePrinter();
 
       logger.info(`Printed step ${step.id}`);

server/src/printer/test-printer.ts

@@ -5,16 +5,27 @@ import { StepRepository, PrintHistoryRepository } from '../db/repositories';
 import { Knex } from 'knex';
 import logger from '../logger';
 import { formatUtils } from './format-utils';
+import { CommandBuilder } from './printer-commands';
+import { TestCommandExecutor } from './command-executor';
+import {
+  PAPER_CONFIG,
+  FONT_SIZES,
+  ALIGNMENT,
+  FONT,
+  STYLE,
+} from './printer-constants';
 
 export class TestPrinter implements Printer {
   private readonly outputDir: string;
   private printHistoryRepo: PrintHistoryRepository;
   private stepRepository: StepRepository;
+  private commandExecutor: TestCommandExecutor;
 
   constructor(printHistoryRepo: PrintHistoryRepository, stepRepo: StepRepository) {
     this.outputDir = path.join(process.cwd(), 'test-output');
     this.printHistoryRepo = printHistoryRepo;
     this.stepRepository = stepRepo;
+    this.commandExecutor = new TestCommandExecutor();
     this.ensureOutputDir();
   }
 
@@ -35,12 +46,41 @@ export class TestPrinter implements Printer {
     const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
     const filename = path.join(this.outputDir, `task-${task.id}-${timestamp}.txt`);
 
-    const content = [
-      ...formatUtils.formatSection(`Task: ${task.name}`, ''),
-      ...formatUtils.formatList(taskSteps.map((step, index) =>
-        formatUtils.formatStepHeader(step.name, index + 1, task.name, true)
-      ), 0, '- '),
-    ].join('\n') + '\n';
+    const commands = [
+      // Header with task name
+      CommandBuilder.header(`Task: ${task.name}`),
+      CommandBuilder.banner('=', PAPER_CONFIG.BANNER_LENGTH),
+      CommandBuilder.align(ALIGNMENT.LEFT),
+
+      // Task ID as barcode
+      ...CommandBuilder.taskBarcodeWithAlignment(task.id),
+      CommandBuilder.newline(),
+    ];
+
+    // Add steps
+    for (let i = 0; i < taskSteps.length; i++) {
+      const step = taskSteps[i];
+      logger.info(`Printing step ${step.id}: name="${step.name}", instructions="${step.instructions}"`);
+
+      const headerText = formatUtils.getCheckboxText(formatUtils.stepHeader(step.name, i + 1, task.name, true));
+      commands.push(
+        CommandBuilder.fontSize(FONT_SIZES.NORMAL),
+        CommandBuilder.text(headerText),
+        CommandBuilder.newline(),
+        ...formatUtils.section(
+          '',
+          step.instructions || 'No instructions provided',
+          '-'
+        ),
+        ...CommandBuilder.stepBarcodeWithAlignment(step.id),
+        CommandBuilder.newline()
+      );
+    }
+
+    commands.push(CommandBuilder.cut(true, PAPER_CONFIG.CUT_LINES));
+
+    await this.commandExecutor.executeCommands(commands);
+    const content = this.commandExecutor.getOutput();
 
     await fs.writeFile(filename, content);
     logger.info(`Printed task ${task.id} to ${filename}`);
@@ -61,10 +101,26 @@ export class TestPrinter implements Printer {
     const task = await this.stepRepository.findTaskById(step.id);
     const stepNumber = await this.stepRepository.findStepNumber(step.id);
 
-    const content = formatUtils.formatSection(
-      formatUtils.formatStepHeader(step.name, stepNumber, task?.name),
-      step.instructions
-    ).join('\n') + '\n';
+    const headerText = formatUtils.getCheckboxText(formatUtils.stepHeader(step.name, stepNumber, task?.name));
+
+    const commands = [
+      CommandBuilder.font(FONT.DEFAULT),
+      CommandBuilder.align(ALIGNMENT.CENTER),
+      CommandBuilder.style(STYLE.BOLD),
+      CommandBuilder.fontSize(FONT_SIZES.NORMAL),
+      CommandBuilder.text(headerText),
+      CommandBuilder.newline(),
+      CommandBuilder.align(ALIGNMENT.LEFT),
+      CommandBuilder.fontSize(FONT_SIZES.NORMAL),
+      CommandBuilder.text(step.instructions || 'No instructions provided'),
+      CommandBuilder.newline(),
+      CommandBuilder.newline(),
+      ...CommandBuilder.stepBarcodeWithAlignment(step.id),
+      CommandBuilder.cut(true, PAPER_CONFIG.CUT_LINES),
+    ];
+
+    await this.commandExecutor.executeCommands(commands);
+    const content = this.commandExecutor.getOutput();
 
     await fs.writeFile(filename, content);
     logger.info(`Printed step ${step.id} to ${filename}`);