import * as fs from 'fs';
import * as path from 'path';
import { TypeParser, createTypeParser } from '../src/parsers/typeParser';
import { DependencyGraphBuilder, createDependencyGraphBuilder } from '../src/analyzers/dependencyGraph';
import { detectCircularDependencies } from '../src/analyzers/circularDetector';

describe('Integration Tests', () => {
  const fixturesDir = path.join(__dirname, 'fixtures');

  beforeAll(() => {
    if (!fs.existsSync(fixturesDir)) {
      fs.mkdirSync(fixturesDir, { recursive: true });
    }
  });

  describe('Real-world TypeScript parsing', () => {
    it('should parse complex interfaces with generics', () => {
      const source = `
        interface ApiResponse<T> {
          data: T;
          status: number;
          message: string;
          timestamp: Date;
        }

        interface User {
          id: number;
          name: string;
          email: string;
        }

        type UserApiResponse = ApiResponse<User>;
      `;

      const parser = createTypeParser();
      const result = parser.parse(source, 'test.ts');

      expect(result.types.length).toBeGreaterThanOrEqual(2);
    });

    it('should parse conditional types', () => {
      const source = `
        type IfEquals<X, Y, A, B> =
          (<T>() => T extends X ? 1 : 2) extends
          (<T>() => T extends Y ? 1 : 2) ? A : B;

        type DeepPartial<T> = {
          [P in keyof T]?: T[P] extends object ? DeepPartial<T[P]> : T[P];
        };
      `;

      const parser = createTypeParser();
      const result = parser.parse(source, 'test.ts');

      expect(result.types.length).toBe(2);
    });

    it('should parse mapped types', () => {
      const source = `
        type Readonly<T> = {
          readonly [P in keyof T]: T[P];
        };

        type Partial<T> = {
          [P in keyof T]?: T[P];
        };
      `;

      const parser = createTypeParser();
      const result = parser.parse(source, 'test.ts');

      expect(result.types.length).toBe(2);
    });

    it('should parse template literal types', () => {
      const source = `
        type EventName = \`on\${string}\`;
        type Color = 'red' | 'green' | 'blue';
      `;

      const parser = createTypeParser();
      const result = parser.parse(source, 'test.ts');

      expect(result.types.length).toBe(2);
    });
  });

  describe('Circular Dependency Detection Integration', () => {
    it('should detect circular dependencies in a chain', () => {
      const files = [
        {
          filePath: '/test/a.ts',
          types: [
            { name: 'A', filePath: '/test/a.ts', startLine: 1, endLine: 5, kind: 'interface' as const, dependencies: ['B'], rawNode: undefined }
          ],
          imports: [],
          errors: []
        },
        {
          filePath: '/test/b.ts',
          types: [
            { name: 'B', filePath: '/test/b.ts', startLine: 1, endLine: 5, kind: 'interface' as const, dependencies: ['C'], rawNode: undefined }
          ],
          imports: [],
          errors: []
        },
        {
          filePath: '/test/c.ts',
          types: [
            { name: 'C', filePath: '/test/c.ts', startLine: 1, endLine: 5, kind: 'interface' as const, dependencies: ['A'], rawNode: undefined }
          ],
          imports: [],
          errors: []
        }
      ];

      const builder = createDependencyGraphBuilder();
      const graph = builder.build(files, '/test');
      const cycles = detectCircularDependencies(graph);

      expect(cycles.length).toBeGreaterThan(0);
      expect(cycles[0].nodes).toContain('/test/a.ts#A');
      expect(cycles[0].nodes).toContain('/test/b.ts#B');
      expect(cycles[0].nodes).toContain('/test/c.ts#C');
    });

    it('should handle multiple independent circular dependencies', () => {
      const files = [
        {
          filePath: '/test/a.ts',
          types: [
            { name: 'A', filePath: '/test/a.ts', startLine: 1, endLine: 5, kind: 'interface' as const, dependencies: ['B'], rawNode: undefined }
          ],
          imports: [],
          errors: []
        },
        {
          filePath: '/test/b.ts',
          types: [
            { name: 'B', filePath: '/test/b.ts', startLine: 1, endLine: 5, kind: 'interface' as const, dependencies: ['A'], rawNode: undefined }
          ],
          imports: [],
          errors: []
        },
        {
          filePath: '/test/c.ts',
          types: [
            { name: 'C', filePath: '/test/c.ts', startLine: 1, endLine: 5, kind: 'interface' as const, dependencies: ['D'], rawNode: undefined }
          ],
          imports: [],
          errors: []
        },
        {
          filePath: '/test/d.ts',
          types: [
            { name: 'D', filePath: '/test/d.ts', startLine: 1, endLine: 5, kind: 'interface' as const, dependencies: ['C'], rawNode: undefined }
          ],
          imports: [],
          errors: []
        }
      ];

      const builder = createDependencyGraphBuilder();
      const graph = builder.build(files, '/test');
      const cycles = detectCircularDependencies(graph);

      expect(cycles.length).toBe(2);
    });
  });

  describe('Full Analysis Pipeline', () => {
    it('should parse and build graph for complex type hierarchy', () => {
      const source = `
        interface Animal {
          name: string;
        }

        interface Dog extends Animal {
          breed: string;
        }

        interface Cat extends Animal {
          color: string;
        }

        type Pet = Dog | Cat;
      `;

      const parser = createTypeParser();
      const parsedFiles = parser.parse(source, 'test.ts');

      const builder = createDependencyGraphBuilder();
      const graph = builder.build([parsedFiles], '/test');

      expect(graph.nodes.size).toBe(4);
      expect(graph.edges.length).toBeGreaterThanOrEqual(2);

      const dogNode = graph.nodes.get('test.ts#Dog');
      expect(dogNode).toBeDefined();

      const petNode = graph.nodes.get('test.ts#Pet');
      expect(petNode).toBeDefined();
    });
  });
});