import { describe, it, expect } from 'vitest';
import { SupportedLanguages } from 'gitnexus-shared';
import {
  detectFrameworkFromPath,
  detectFrameworkFromAST,
} from '../../src/core/ingestion/framework-detection.js';
import { providers } from '../../src/core/ingestion/languages/index.js';

describe('detectFrameworkFromPath', () => {
  describe('Next.js', () => {
    it('detects Pages Router pages', () => {
      const result = detectFrameworkFromPath('pages/users.tsx');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('nextjs-pages');
      expect(result!.entryPointMultiplier).toBe(3.0);
    });

    it('ignores _app and _document pages', () => {
      expect(detectFrameworkFromPath('pages/_app.tsx')).toBeNull();
    });

    it('detects App Router page.tsx', () => {
      const result = detectFrameworkFromPath('app/dashboard/page.tsx');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('nextjs-app');
    });

    it('detects API routes in pages', () => {
      const result = detectFrameworkFromPath('pages/api/users.ts');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('nextjs-api');
    });

    it('detects App Router API route.ts', () => {
      const result = detectFrameworkFromPath('app/api/users/route.ts');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('nextjs-api');
    });

    it('detects layout files', () => {
      const result = detectFrameworkFromPath('app/layout.tsx');
      expect(result).not.toBeNull();
      expect(result!.entryPointMultiplier).toBe(2.0);
    });
  });

  describe('Expo Router', () => {
    it('detects _layout files', () => {
      const result = detectFrameworkFromPath('app/_layout.tsx');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('expo-router');
      expect(result!.reason).toBe('expo-layout');
    });
    it('detects +api routes', () => {
      const result = detectFrameworkFromPath('app/users+api.ts');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('expo-router');
      expect(result!.reason).toBe('expo-api-route');
    });
    it('detects screen files', () => {
      const result = detectFrameworkFromPath('app/(tabs)/settings.tsx');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('expo-router');
      expect(result!.reason).toBe('expo-screen');
      expect(result!.entryPointMultiplier).toBe(2.5);
    });
  });

  describe('Express / Node.js', () => {
    it('detects route files', () => {
      const result = detectFrameworkFromPath('routes/auth.ts');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('express');
      expect(result!.entryPointMultiplier).toBe(2.5);
    });
  });

  describe('MVC controllers', () => {
    it('detects controller folder', () => {
      const result = detectFrameworkFromPath('controllers/UserController.ts');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('mvc');
    });

    it('detects handlers folder', () => {
      const result = detectFrameworkFromPath('handlers/auth.ts');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('handlers');
    });
  });

  describe('React', () => {
    it('has React component detection rule for views/components folders', () => {
      const result = detectFrameworkFromPath('views/Button.tsx');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('react');
      expect(result!.entryPointMultiplier).toBe(1.5);
      expect(result!.reason).toBe('react-component');
    });
  });

  describe('Python frameworks', () => {
    it('detects Django views', () => {
      const result = detectFrameworkFromPath('myapp/views.py');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('django');
      expect(result!.entryPointMultiplier).toBe(3.0);
    });

    it('detects Django URLs', () => {
      const result = detectFrameworkFromPath('myapp/urls.py');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('django');
    });

    it('detects FastAPI routers', () => {
      const result = detectFrameworkFromPath('routers/users.py');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('fastapi');
    });
  });

  describe('Java frameworks', () => {
    it('detects Spring controllers folder', () => {
      const result = detectFrameworkFromPath('controller/UserController.java');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('spring');
    });

    it('detects Spring controller by filename', () => {
      const result = detectFrameworkFromPath('src/UserController.java');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('spring');
    });

    it('detects Java service layer', () => {
      const result = detectFrameworkFromPath('service/UserService.java');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('java-service');
    });
  });

  describe('C# / .NET', () => {
    it('detects ASP.NET controllers', () => {
      const result = detectFrameworkFromPath('controllers/UsersController.cs');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('aspnet');
    });

    it('detects Blazor pages', () => {
      const result = detectFrameworkFromPath('pages/Index.razor');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('blazor');
    });
  });

  describe('Go frameworks', () => {
    it('detects Go handlers', () => {
      const result = detectFrameworkFromPath('handlers/user.go');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('go-http');
    });

    it('detects Go main.go', () => {
      const result = detectFrameworkFromPath('cmd/server/main.go');
      expect(result).not.toBeNull();
      expect(result!.entryPointMultiplier).toBe(3.0);
    });

    it('does NOT treat Go helper files under cmd/ as entry points', () => {
      expect(detectFrameworkFromPath('cmd/server/internal/util.go')).toBeNull();
      expect(detectFrameworkFromPath('cmd/foo/config/setup.go')).toBeNull();
    });
  });

  describe('Rust frameworks', () => {
    it('detects Rust handlers', () => {
      const result = detectFrameworkFromPath('handlers/auth.rs');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('rust-web');
    });

    it('detects main.rs', () => {
      const result = detectFrameworkFromPath('src/main.rs');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('rust');
      expect(result!.entryPointMultiplier).toBe(3.0);
    });

    it('detects bin folder', () => {
      const result = detectFrameworkFromPath('src/bin/cli.rs');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('rust');
    });
  });

  describe('C / C++', () => {
    it('detects main.c', () => {
      const result = detectFrameworkFromPath('src/main.c');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('c-cpp');
    });

    it('detects main.cpp', () => {
      const result = detectFrameworkFromPath('src/main.cpp');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('c-cpp');
    });
  });

  describe('PHP / Laravel', () => {
    it('detects Laravel routes', () => {
      const result = detectFrameworkFromPath('routes/web.php');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('laravel');
      expect(result!.entryPointMultiplier).toBe(3.0);
    });

    it('detects Laravel controllers', () => {
      const result = detectFrameworkFromPath('http/controllers/UserController.php');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('laravel');
    });

    it('detects Laravel jobs', () => {
      const result = detectFrameworkFromPath('jobs/SendEmail.php');
      expect(result).not.toBeNull();
      expect(result!.reason).toBe('laravel-job');
    });

    it('detects Laravel middleware', () => {
      const result = detectFrameworkFromPath('http/middleware/Auth.php');
      expect(result).not.toBeNull();
      expect(result!.reason).toBe('laravel-middleware');
    });

    it('detects Laravel models', () => {
      const result = detectFrameworkFromPath('models/User.php');
      expect(result).not.toBeNull();
      expect(result!.entryPointMultiplier).toBe(1.5);
    });
  });

  describe('Swift / iOS', () => {
    it('detects AppDelegate', () => {
      const result = detectFrameworkFromPath('Sources/AppDelegate.swift');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('ios');
    });

    it('detects ViewControllers folder', () => {
      const result = detectFrameworkFromPath('ViewControllers/LoginVC.swift');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('uikit');
    });

    it('detects Coordinator pattern', () => {
      const result = detectFrameworkFromPath('Coordinators/AppCoordinator.swift');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('ios-coordinator');
    });

    it('detects SwiftUI views folder', () => {
      const result = detectFrameworkFromPath('views/ContentView.swift');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('swiftui');
    });
  });

  describe('generic patterns', () => {
    it('returns null for unknown paths', () => {
      expect(detectFrameworkFromPath('src/internal/crypto.ts')).toBeNull();
    });

    it('normalizes Windows backslashes', () => {
      const result = detectFrameworkFromPath('routes\\auth.ts');
      expect(result).not.toBeNull();
      expect(result!.framework).toBe('express');
    });
  });
});

describe('detectFrameworkFromAST', () => {
  it('returns null for empty inputs', () => {
    expect(detectFrameworkFromAST('', '')).toBeNull();
    expect(detectFrameworkFromAST('typescript', '')).toBeNull();
    expect(detectFrameworkFromAST('', 'some code')).toBeNull();
  });

  it('detects NestJS decorators in TypeScript', () => {
    const result = detectFrameworkFromAST('typescript', '@Controller("/users")');
    expect(result).not.toBeNull();
    expect(result!.framework).toBe('nestjs');
    expect(result!.entryPointMultiplier).toBe(3.2);
  });

  it('detects NestJS decorators in JavaScript', () => {
    const result = detectFrameworkFromAST('javascript', '@Get("/")');
    expect(result).not.toBeNull();
    expect(result!.framework).toBe('nestjs');
  });

  it('detects FastAPI decorators in Python', () => {
    const result = detectFrameworkFromAST('python', '@app.get("/users")');
    expect(result).not.toBeNull();
    expect(result!.framework).toBe('fastapi');
  });

  it('detects Flask decorators in Python', () => {
    const result = detectFrameworkFromAST('python', '@app.route("/users")');
    expect(result).not.toBeNull();
    expect(result!.framework).toBe('flask');
  });

  it('detects Spring annotations in Java', () => {
    const result = detectFrameworkFromAST('java', '@RestController');
    expect(result).not.toBeNull();
    expect(result!.framework).toBe('spring');
  });

  it('detects ASP.NET attributes in C#', () => {
    const result = detectFrameworkFromAST('csharp', '[ApiController]');
    expect(result).not.toBeNull();
    expect(result!.framework).toBe('aspnet');
  });

  it('detects Laravel route definitions in PHP', () => {
    const result = detectFrameworkFromAST(
      'php',
      "Route::get('/users', [UserController::class, 'index'])",
    );
    expect(result).not.toBeNull();
    expect(result!.framework).toBe('laravel');
  });

  it('detects Actix-web route attributes in Rust', () => {
    const result = detectFrameworkFromAST('rust', '#[get("/")]');
    expect(result).not.toBeNull();
    expect(result!.framework).toBe('actix-web');
  });

  it('returns null for language with no matching pattern', () => {
    expect(detectFrameworkFromAST('c', 'int main() { return 0; }')).toBeNull();
  });

  it('is case-insensitive', () => {
    const result = detectFrameworkFromAST('TypeScript', '@controller("/")');
    expect(result).not.toBeNull();
  });

  it('detects Expo Router useRouter hook', () => {
    const result = detectFrameworkFromAST('typescript', 'const router = useRouter()');
    expect(result).not.toBeNull();
    expect(result!.framework).toBe('expo-router');
  });
  it('detects Expo Router router.push', () => {
    const result = detectFrameworkFromAST('javascript', "router.push('/settings')");
    expect(result).not.toBeNull();
    expect(result!.framework).toBe('expo-router');
  });
});

describe('provider registry exhaustiveness', () => {
  // Compile-time exhaustiveness is enforced by `satisfies Record<SupportedLanguages, ...>`
  // in languages/index.ts. This runtime guard catches drift if the enum and the
  // providers map ever diverge at runtime (e.g. via build-artifact mismatch),
  // since both shared lookup maps are built from `Object.entries(providers)`.
  it('has one provider per SupportedLanguages enum member', () => {
    expect(Object.keys(providers).sort()).toEqual(Object.values(SupportedLanguages).sort());
  });
});

describe('provider astFrameworkPatterns', () => {
  it('preserves multiplier and reason for high-priority frameworks', () => {
    // Pin the exact multiplier and reason strings to catch silent drift
    // during the per-language pattern relocation. These three frameworks
    // are the most-used decorator-driven entry-point boosters.
    const expectedConfigs: Record<string, { multiplier: number; reason: string }> = {
      nestjs: { multiplier: 3.2, reason: 'nestjs-decorator' },
      spring: { multiplier: 3.2, reason: 'spring-annotation' },
      fastapi: { multiplier: 3.0, reason: 'fastapi-decorator' },
    };
    const seen = new Set<string>();
    for (const provider of Object.values(providers)) {
      for (const cfg of provider.astFrameworkPatterns ?? []) {
        const expected = expectedConfigs[cfg.framework];
        if (!expected) continue;
        expect(cfg.entryPointMultiplier).toBe(expected.multiplier);
        expect(cfg.reason).toBe(expected.reason);
        seen.add(cfg.framework);
      }
    }
    for (const fw of Object.keys(expectedConfigs)) {
      expect(seen.has(fw), `missing framework config: ${fw}`).toBe(true);
    }
  });

  it('covers all expected frameworks across providers', () => {
    const expectedFrameworks = new Set([
      'nestjs',
      'expo-router',
      'fastapi',
      'flask',
      'spring',
      'jaxrs',
      'aspnet',
      'signalr',
      'blazor',
      'efcore',
      'go-http',
      'gin',
      'echo',
      'fiber',
      'go-grpc',
      'laravel',
      'actix-web',
      'axum',
      'rocket',
      'tokio',
      'qt',
      'uikit',
      'swiftui',
      'vapor',
      'rails',
      'sinatra',
      'spring-kotlin',
      'ktor',
      'android-kotlin',
      'flutter',
      'riverpod',
    ]);
    const foundFrameworks = new Set<string>();
    for (const provider of Object.values(providers)) {
      for (const cfg of provider.astFrameworkPatterns ?? []) {
        foundFrameworks.add(cfg.framework);
        expect(cfg.patterns.length).toBeGreaterThan(0);
      }
    }
    for (const fw of expectedFrameworks) {
      expect(foundFrameworks.has(fw), `missing framework: ${fw}`).toBe(true);
    }
  });
});
