/**
 * OpenAPI 3.1 Support Tests
 *
 * Tests for OpenAPI 3.1 specific features:
 * - Type as array: type: ['string', 'null']
 * - Const keyword: const: "value"
 * - Webhook metadata extraction
 * - Backward compatibility with OpenAPI 3.0 nullable
 */

import { parseSpec } from '../../src/lib/parser.js';
import { generateToolHandler } from '../../src/tools/generate.js';
import * as path from 'path';
import { fileURLToPath } from 'url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

interface TestResult {
  name: string;
  passed: boolean;
  error?: string;
}

const results: TestResult[] = [];

function test(name: string, fn: () => Promise<void> | void): void {
  const wrapped = async () => {
    try {
      await fn();
      results.push({ name, passed: true });
      console.log(`  ✓ ${name}`);
    } catch (err) {
      results.push({ name, passed: false, error: (err as Error).message });
      console.log(`  ✗ ${name}`);
      console.log(`    Error: ${(err as Error).message}`);
    }
  };
  wrapped();
}

function assertEqual<T>(actual: T, expected: T, message?: string): void {
  if (actual !== expected) {
    throw new Error(message || `Expected ${expected}, got ${actual}`);
  }
}

function assertContains(str: string, substring: string, message?: string): void {
  if (!str.includes(substring)) {
    throw new Error(message || `Expected string to contain "${substring}"\nActual: ${str}`);
  }
}

function assertNotContains(str: string, substring: string, message?: string): void {
  if (str.includes(substring)) {
    throw new Error(message || `Expected string NOT to contain "${substring}"\nActual: ${str}`);
  }
}

async function runTests() {
  console.log('\n=== OpenAPI 3.1 Support Tests ===\n');

  const fixturePath = path.join(__dirname, '../../test/fixtures/openapi-31.yaml');

  // ==========================================
  // Parsing and Metadata Tests
  // ==========================================
  console.log('Parsing and Metadata:');

  test('Parse OpenAPI 3.1 spec successfully', async () => {
    const result = await parseSpec(fixturePath, { noCache: true });
    assertEqual(result.metadata.version, 'OpenAPI 3.1.0');
    assertEqual(result.metadata.title, 'OpenAPI 3.1 Test Spec');
  });

  test('Extract webhook count from 3.1 spec', async () => {
    const result = await parseSpec(fixturePath, { noCache: true });
    assertEqual(result.metadata.webhookCount, 2, 'Should have 2 webhooks');
  });

  test('3.0 spec has undefined webhookCount', async () => {
    // Use petstore as a 3.0 spec (or any 3.0/2.0 spec)
    const result = await parseSpec('https://petstore.swagger.io/v2/swagger.json', { noCache: true });
    assertEqual(result.metadata.webhookCount, undefined, 'Swagger 2.0 should have undefined webhookCount');
  });

  // ==========================================
  // Type Generation Tests - Array Types
  // ==========================================
  console.log('\nType Generation - Array Types:');

  test('Generate type for type: [string, null]', async () => {
    const result = await generateToolHandler({
      path: fixturePath,
      schemas: ['NullableString'],
      noCache: true,
    });
    const content = result.content[0];
    if (content.type !== 'text') throw new Error('Expected text content');
    assertContains(content.text, 'string | null', 'Should generate string | null');
  });

  test('Generate type for type: [string, number]', async () => {
    const result = await generateToolHandler({
      path: fixturePath,
      schemas: ['StringOrNumber'],
      noCache: true,
    });
    const content = result.content[0];
    if (content.type !== 'text') throw new Error('Expected text content');
    assertContains(content.text, 'string | number', 'Should generate string | number');
  });

  test('Generate type for type: [integer, null]', async () => {
    const result = await generateToolHandler({
      path: fixturePath,
      schemas: ['NullableInteger'],
      noCache: true,
    });
    const content = result.content[0];
    if (content.type !== 'text') throw new Error('Expected text content');
    assertContains(content.text, 'number | null', 'Should generate number | null');
  });

  // ==========================================
  // Type Generation Tests - Const Keyword
  // ==========================================
  console.log('\nType Generation - Const Keyword:');

  test('Generate literal type for const: "active"', async () => {
    const result = await generateToolHandler({
      path: fixturePath,
      schemas: ['StatusActive'],
      noCache: true,
    });
    const content = result.content[0];
    if (content.type !== 'text') throw new Error('Expected text content');
    assertContains(content.text, "'active'", 'Should generate literal type');
  });

  test('Generate literal type for const: 200', async () => {
    const result = await generateToolHandler({
      path: fixturePath,
      schemas: ['StatusCode'],
      noCache: true,
    });
    const content = result.content[0];
    if (content.type !== 'text') throw new Error('Expected text content');
    assertContains(content.text, '200', 'Should generate number literal');
  });

  // ==========================================
  // Type Generation Tests - Object with 3.1 Features
  // ==========================================
  console.log('\nType Generation - Objects with 3.1 Features:');

  test('Generate User interface with nullable properties', async () => {
    const result = await generateToolHandler({
      path: fixturePath,
      schemas: ['User'],
      noCache: true,
    });
    const content = result.content[0];
    if (content.type !== 'text') throw new Error('Expected text content');
    // Check that name can be string | null
    assertContains(content.text, 'name?:', 'Should have name property');
    // Check const status property
    assertContains(content.text, 'status:', 'Should have status property');
  });

  // ==========================================
  // Backward Compatibility Tests
  // ==========================================
  console.log('\nBackward Compatibility:');

  test('Generate type with OpenAPI 3.0 nullable: true', async () => {
    const result = await generateToolHandler({
      path: fixturePath,
      schemas: ['LegacyUser'],
      noCache: true,
    });
    const content = result.content[0];
    if (content.type !== 'text') throw new Error('Expected text content');
    assertContains(content.text, 'string | null', 'Should handle 3.0 nullable');
  });

  test('Parse Swagger 2.0 spec (petstore) still works', async () => {
    const result = await parseSpec('https://petstore.swagger.io/v2/swagger.json', { noCache: true });
    assertEqual(result.metadata.version.includes('Swagger'), true, 'Should parse as Swagger');
    assertEqual(result.metadata.pathCount > 0, true, 'Should have paths');
  });

  // ==========================================
  // Full Generation Test
  // ==========================================
  console.log('\nFull Generation:');

  test('Generate all schemas from 3.1 spec', async () => {
    const result = await generateToolHandler({
      path: fixturePath,
      noCache: true,
    });
    const content = result.content[0];
    if (content.type !== 'text') throw new Error('Expected text content');
    // Verify multiple schemas generated
    assertContains(content.text, 'NullableString', 'Should have NullableString');
    assertContains(content.text, 'User', 'Should have User');
    assertContains(content.text, 'StatusActive', 'Should have StatusActive');
    assertContains(content.text, 'LegacyUser', 'Should have LegacyUser');
  });

  // Wait for all async tests to complete
  await new Promise(resolve => setTimeout(resolve, 3000));

  // Print summary
  console.log('\n=== Test Summary ===');
  const passed = results.filter(r => r.passed).length;
  const failed = results.filter(r => !r.passed).length;
  console.log(`Passed: ${passed}`);
  console.log(`Failed: ${failed}`);
  console.log(`Total: ${results.length}`);

  if (failed > 0) {
    console.log('\nFailed tests:');
    results.filter(r => !r.passed).forEach(r => {
      console.log(`  - ${r.name}: ${r.error}`);
    });
    process.exit(1);
  }

  console.log('\n✓ All tests passed!\n');
}

runTests().catch(err => {
  console.error('Test suite failed:', err);
  process.exit(1);
});