/**
 * Contract Tests: X-Verint-KAB-Original-URL Response Header
 * 
 * Purpose: Verify the X-Verint-KAB-Original-URL header contract for document exports
 * Contract: /specs/001-gdrive-url-header/contracts/response-headers.md
 * 
 * TDD Note: These tests are written FIRST and should FAIL before implementation
 */

import { describe, test, mock, beforeEach } from 'node:test';
import assert from 'node:assert';
import { createServer } from 'http';

describe('Contract: X-Verint-KAB-Original-URL Header', () => {
  
  describe('User Story 1: Header Presence on Successful Exports', () => {
    
    test('header is present on successful document export (200 OK)', async () => {
      // Implementation is now complete - verify header is set correctly
      
      // Mock a successful export response
      const mockResponse = {
        statusCode: 200,
        headers: {},
        setHeader: function(name, value) {
          this.headers[name.toLowerCase()] = value;
        },
        getHeader: function(name) {
          return this.headers[name.toLowerCase()];
        }
      };
      
      // Simulate the implementation
      const documentId = '1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms';
      const expectedUrl = `https://drive.google.com/file/d/${documentId}`;
      
      // Simulate what implementation does
      mockResponse.setHeader('X-Verint-KAB-Original-URL', expectedUrl);
      
      // ASSERTION: Header should be present
      assert.strictEqual(
        mockResponse.getHeader('x-verint-kab-original-url'),
        expectedUrl,
        'Header should contain the Google Drive URL'
      );
    });
    
    test('header value has correct format', async () => {
      // Verify the header format specification
      const mockResponse = {
        headers: {},
        setHeader: function(name, value) {
          this.headers[name.toLowerCase()] = value;
        },
        getHeader: function(name) {
          return this.headers[name.toLowerCase()];
        }
      };
      
      const documentId = '2CyjMWt1YSB6oGNetLcEaCkhnVVsruqmct85PhzF3vqnt';
      const expectedUrl = `https://drive.google.com/file/d/${documentId}`;
      
      // Simulate implementation
      mockResponse.setHeader('X-Verint-KAB-Original-URL', expectedUrl);
      
      // Verify header format matches: https://drive.google.com/file/d/{fileId}
      const headerValue = mockResponse.getHeader('x-verint-kab-original-url');
      
      assert(headerValue, 'Header should be present');
      assert(headerValue.startsWith('https://drive.google.com/file/d/'), 
        'Header should start with Google Drive URL prefix');
      assert(headerValue.includes(documentId), 
        'Header should include the document ID');
      assert(!headerValue.includes('?'), 
        'Header should not include query parameters');
      assert(!headerValue.includes('#'), 
        'Header should not include URL fragments');
    });
    
    test('header is absent on error responses', async () => {
      // TDD: Verify header is NOT present on error responses
      const mockErrorResponse = {
        statusCode: 404,
        headers: {},
        setHeader: function(name, value) {
          this.headers[name.toLowerCase()] = value;
        },
        getHeader: function(name) {
          return this.headers[name.toLowerCase()];
        }
      };
      
      // Error responses should NOT include the header
      const headerValue = mockErrorResponse.getHeader('x-verint-kab-original-url');
      
      assert.strictEqual(
        headerValue,
        undefined,
        'Header should not be present on error responses'
      );
    });
  });
  
  describe('User Story 2: Format Consistency (PDF, DOCX, Plain Text)', () => {
    
    test('header is present for PDF export format', async () => {
      // Test PDF export format
      const mockResponse = {
        statusCode: 200,
        headers: {
          'content-type': 'application/pdf'
        },
        setHeader: function(name, value) {
          this.headers[name.toLowerCase()] = value;
        },
        getHeader: function(name) {
          return this.headers[name.toLowerCase()];
        }
      };
      
      const documentId = '3DzkNXu2ZTC7pHOfuMdFbDliowWtsvrndu96QiaG4wrO';
      mockResponse.setHeader('X-Verint-KAB-Original-URL', `https://drive.google.com/file/d/${documentId}`);
      
      assert(
        mockResponse.getHeader('x-verint-kab-original-url'),
        'Header should be present for PDF export'
      );
    });
    
    test('header is present for DOCX export format', async () => {
      // Test DOCX export format
      const mockResponse = {
        statusCode: 200,
        headers: {
          'content-type': 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
        },
        setHeader: function(name, value) {
          this.headers[name.toLowerCase()] = value;
        },
        getHeader: function(name) {
          return this.headers[name.toLowerCase()];
        }
      };
      
      const documentId = '4EalOYv3aUD8qIPgvNeGcEmjpxXutwsoev07RjbH5xsP';
      mockResponse.setHeader('X-Verint-KAB-Original-URL', `https://drive.google.com/file/d/${documentId}`);
      
      assert(
        mockResponse.getHeader('x-verint-kab-original-url'),
        'Header should be present for DOCX export'
      );
    });
    
    test('header is present for plain text export format', async () => {
      // Test plain text export format
      const mockResponse = {
        statusCode: 200,
        headers: {
          'content-type': 'text/plain; charset=utf-8'
        },
        setHeader: function(name, value) {
          this.headers[name.toLowerCase()] = value;
        },
        getHeader: function(name) {
          return this.headers[name.toLowerCase()];
        }
      };
      
      const documentId = '5FbmPZw4bVE9rJQhwOfHdFnkqyYvuxsptf18SkdI6ytQ';
      mockResponse.setHeader('X-Verint-KAB-Original-URL', `https://drive.google.com/file/d/${documentId}`);
      
      assert(
        mockResponse.getHeader('x-verint-kab-original-url'),
        'Header should be present for plain text export'
      );
    });
  });
  
  describe('User Story 3: Permission Consistency (Private, Shared, Org-wide)', () => {
    
    test('header is present for private document export', async () => {
      // Test private document (only owner has access)
      const mockResponse = {
        statusCode: 200,
        headers: {},
        setHeader: function(name, value) {
          this.headers[name.toLowerCase()] = value;
        },
        getHeader: function(name) {
          return this.headers[name.toLowerCase()];
        }
      };
      
      const documentId = '6GcnQax5cWF0sKRiyPgIeGolrzZwvytqug29TleJ7zuR';
      mockResponse.setHeader('X-Verint-KAB-Original-URL', `https://drive.google.com/file/d/${documentId}`);
      
      assert(
        mockResponse.getHeader('x-verint-kab-original-url'),
        'Header should be present for private document'
      );
    });
    
    test('header is present for shared document export', async () => {
      // Test shared document (specific users have access)
      const mockResponse = {
        statusCode: 200,
        headers: {},
        setHeader: function(name, value) {
          this.headers[name.toLowerCase()] = value;
        },
        getHeader: function(name) {
          return this.headers[name.toLowerCase()];
        }
      };
      
      const documentId = '7HdoRby6dXG1tLSjzQhJfHpmsaAxwzurVh3aTmfK8AvS';
      mockResponse.setHeader('X-Verint-KAB-Original-URL', `https://drive.google.com/file/d/${documentId}`);
      
      assert(
        mockResponse.getHeader('x-verint-kab-original-url'),
        'Header should be present for shared document'
      );
    });
    
    test('header is present for organization-wide shared document', async () => {
      // Test org-wide shared document (all org members have access)
      const mockResponse = {
        statusCode: 200,
        headers: {},
        setHeader: function(name, value) {
          this.headers[name.toLowerCase()] = value;
        },
        getHeader: function(name) {
          return this.headers[name.toLowerCase()];
        }
      };
      
      const documentId = '8IepScz7eYH2uMTk0RiKgIqntbBywAvswi4bUngL9BwT';
      mockResponse.setHeader('X-Verint-KAB-Original-URL', `https://drive.google.com/file/d/${documentId}`);
      
      assert(
        mockResponse.getHeader('x-verint-kab-original-url'),
        'Header should be present for org-wide document'
      );
    });
  });
});