codegraph/__tests__/frameworks-integration.test.ts

import { describe, it, expect, beforeAll, afterEach } from 'vitest';
import * as fs from 'fs';
import * as path from 'path';
import * as os from 'os';
import { CodeGraph } from '../src';
import { initGrammars, loadAllGrammars } from '../src/extraction/grammars';

beforeAll(async () => {
  await initGrammars();
  await loadAllGrammars();
});

describe('Django end-to-end framework extraction', () => {
  let tmpDir: string | undefined;
  afterEach(() => {
    if (tmpDir) fs.rmSync(tmpDir, { recursive: true, force: true });
    tmpDir = undefined;
  });

  it('creates a route->view edge from urls.py to view class', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-django-'));
    fs.writeFileSync(path.join(tmpDir, 'manage.py'), '# marker\n');
    fs.writeFileSync(path.join(tmpDir, 'requirements.txt'), 'django==4.2\n');
    fs.mkdirSync(path.join(tmpDir, 'users'));
    fs.writeFileSync(path.join(tmpDir, 'users/__init__.py'), '');
    fs.writeFileSync(
      path.join(tmpDir, 'users/views.py'),
      'class UserListView:\n    def get(self, request): pass\n'
    );
    fs.writeFileSync(
      path.join(tmpDir, 'users/urls.py'),
      'from django.urls import path\n' +
        'from users.views import UserListView\n' +
        'urlpatterns = [path("users/", UserListView.as_view(), name="user-list")]\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();

    // Route node exists
    const routes = cg.getNodesByKind('route');
    expect(routes.length).toBeGreaterThan(0);
    const route = routes.find((n) => n.name === 'users/');
    expect(route).toBeDefined();

    // View class exists
    const classNodes = cg.getNodesByKind('class');
    const view = classNodes.find((n) => n.name === 'UserListView');
    expect(view).toBeDefined();

    // Edge route -> view exists
    const edges = cg.getOutgoingEdges(route!.id);
    const toView = edges.find((e) => e.target === view!.id);
    expect(toView).toBeDefined();
    expect(toView!.kind).toBe('references');

    cg.close();
  });
});

describe('Flask end-to-end framework extraction', () => {
  let tmpDir: string | undefined;
  afterEach(() => {
    if (tmpDir) fs.rmSync(tmpDir, { recursive: true, force: true });
    tmpDir = undefined;
  });

  it('resolves stacked routes across @login_required to a view named after a builtin (index)', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-flask-'));
    fs.writeFileSync(path.join(tmpDir, 'requirements.txt'), 'flask==3.0\n');
    fs.writeFileSync(
      path.join(tmpDir, 'app.py'),
      'from flask import Blueprint, render_template\n' +
        'from flask_login import login_required\n' +
        'bp = Blueprint("main", __name__)\n' +
        '\n' +
        '@bp.route("/", methods=["GET", "POST"])\n' +
        '@bp.route("/index", methods=["GET", "POST"])\n' +
        '@login_required\n' +
        'def index():\n' +
        '    return render_template("index.html")\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();

    // Both stacked @bp.route decorators are extracted (the second was previously
    // dropped because @login_required broke the "def must follow" assumption).
    const routes = cg.getNodesByKind('route');
    expect(routes.map((r) => r.name).sort()).toEqual(['GET /', 'GET /index']);

    // The view function exists even though its name is a Python builtin method.
    const fn = cg.getNodesByKind('function').find((n) => n.name === 'index');
    expect(fn).toBeDefined();

    // Both routes resolve to it — exercises the bare-name builtin guard, which
    // previously filtered the `index` reference as a builtin method.
    for (const route of routes) {
      const edges = cg.getOutgoingEdges(route.id);
      const toView = edges.find((e) => e.target === fn!.id && e.kind === 'references');
      expect(toView, `route ${route.name} should resolve to index()`).toBeDefined();
    }

    cg.close();
  });
});

describe('Flutter end-to-end — setState→build synthesis', () => {
  let tmpDir: string | undefined;
  afterEach(() => {
    if (tmpDir) fs.rmSync(tmpDir, { recursive: true, force: true });
    tmpDir = undefined;
  });

  it('synthesizes a handler→build edge when a State method calls setState', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-flutter-'));
    fs.writeFileSync(
      path.join(tmpDir, 'main.dart'),
      'import "package:flutter/material.dart";\n' +
        'class CounterPage extends StatefulWidget {\n' +
        '  @override\n' +
        '  State<CounterPage> createState() => _CounterPageState();\n' +
        '}\n' +
        'class _CounterPageState extends State<CounterPage> {\n' +
        '  int _count = 0;\n' +
        '  void _increment() {\n' +
        '    setState(() {\n' +
        '      _count++;\n' +
        '    });\n' +
        '  }\n' +
        '  @override\n' +
        '  Widget build(BuildContext context) {\n' +
        '    return Text("$_count");\n' +
        '  }\n' +
        '}\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();

    const methods = cg.getNodesByKind('method');
    const increment = methods.find((n) => n.name === '_increment');
    const build = methods.find((n) => n.name === 'build');
    expect(increment).toBeDefined();
    expect(build).toBeDefined();

    // setState re-runs build (Flutter-internal, no static edge). The synthesizer
    // bridges the handler → build so the "tap → setState → rebuilt UI" flow connects.
    const edges = cg.getOutgoingEdges(increment!.id);
    const toBuild = edges.find((e) => e.target === build!.id && e.kind === 'calls');
    expect(toBuild, '_increment should reach build via setState synthesis').toBeDefined();

    cg.close();
  });
});

describe('C++ end-to-end — virtual override synthesis', () => {
  let tmpDir: string | undefined;
  afterEach(() => {
    if (tmpDir) fs.rmSync(tmpDir, { recursive: true, force: true });
    tmpDir = undefined;
  });

  it('resolves callers through typed object pointers', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-cpp-'));
    let cg: CodeGraph | undefined;
    try {
      fs.writeFileSync(
        path.join(tmpDir, 'detect.hpp'),
        'class CDetect {\n' +
          ' public:\n' +
          '  int Processing();\n' +
          '};\n' +
          'class CDetector {\n' +
          ' private:\n' +
          '  CDetect* m_cpAlg = nullptr;\n' +
          ' public:\n' +
          '  int Run();\n' +
          '  int Flush();\n' +
          '};\n'
      );
      fs.writeFileSync(
        path.join(tmpDir, 'detect.cpp'),
        '#include "detect.hpp"\n' +
          'int CDetector::Run() { return m_cpAlg->Processing(); }\n' +
          'int CDetector::Flush() { return m_cpAlg->Processing(); }\n' +
          'int CDetect::Processing() { return 0; }\n'
      );

      cg = CodeGraph.initSync(tmpDir);
      await cg.indexAll();

      const processing = cg
        .getNodesByKind('method')
        .find((n) => n.qualifiedName.endsWith('CDetect::Processing'));
      expect(processing).toBeDefined();

      const callers = cg.getCallers(processing!.id).map((c) => c.node.qualifiedName);
      expect(callers).toContain('CDetector::Run');
      expect(callers).toContain('CDetector::Flush');

      const runMethod = cg
        .getNodesByKind('method')
        .find((n) => n.qualifiedName.endsWith('CDetector::Run'));
      expect(runMethod).toBeDefined();
      const callees = cg.getCallees(runMethod!.id).map((c) => c.node.qualifiedName);
      expect(callees).toContain('CDetect::Processing');
    } finally {
      cg?.close();
    }
  });

  it('resolves typed pointer callers when the method name is ambiguous and the call sits inside a return/declaration', async () => {
    // Regression: an earlier version of the C++ receiver-type inference matched
    // the call line itself (`return m_cpAlg->Processing()`) and treated `return`
    // as the type, OR grabbed `int r =` as a type from the prefix. With Strategy
    // 3's "unique method name" fallback, the original issue example resolved
    // anyway — but as soon as two classes share a method name (very common in
    // real C++), both calls go unresolved.
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-cpp-'));
    let cg: CodeGraph | undefined;
    try {
      fs.writeFileSync(
        path.join(tmpDir, 'detect.hpp'),
        'class CDetect { public: int Processing(); };\n' +
          'class CWidget { public: int Processing(); };\n' +
          'class CDetector {\n' +
          ' private:\n' +
          '  CDetect* m_cpAlg = nullptr;\n' +
          ' public:\n' +
          '  int RunReturn();\n' +
          '  int RunAssign();\n' +
          '};\n'
      );
      fs.writeFileSync(
        path.join(tmpDir, 'detect.cpp'),
        '#include "detect.hpp"\n' +
          'int CDetector::RunReturn() { return m_cpAlg->Processing(); }\n' +
          'int CDetector::RunAssign() { int r = m_cpAlg->Processing(); return r; }\n' +
          'int CDetect::Processing() { return 0; }\n' +
          'int CWidget::Processing() { return 0; }\n'
      );

      cg = CodeGraph.initSync(tmpDir);
      await cg.indexAll();

      const detectProc = cg
        .getNodesByKind('method')
        .find((n) => n.qualifiedName === 'CDetect::Processing');
      const widgetProc = cg
        .getNodesByKind('method')
        .find((n) => n.qualifiedName === 'CWidget::Processing');
      expect(detectProc).toBeDefined();
      expect(widgetProc).toBeDefined();

      const detectCallers = cg.getCallers(detectProc!.id).map((c) => c.node.qualifiedName);
      expect(detectCallers).toContain('CDetector::RunReturn');
      expect(detectCallers).toContain('CDetector::RunAssign');

      // CWidget::Processing is never called — calls must NOT misroute here.
      const widgetCallers = cg.getCallers(widgetProc!.id).map((c) => c.node.qualifiedName);
      expect(widgetCallers).not.toContain('CDetector::RunReturn');
      expect(widgetCallers).not.toContain('CDetector::RunAssign');
    } finally {
      cg?.close();
    }
  });

  it('bridges a base virtual method to the subclass override', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-cpp-'));
    fs.writeFileSync(
      path.join(tmpDir, 'iter.cpp'),
      'class Iterator {\n' +
        ' public:\n' +
        '  virtual void Next() { }\n' +
        '};\n' +
        'class DBIter : public Iterator {\n' +
        ' public:\n' +
        '  void Next() override { advance(); }\n' +
        '  void advance() { }\n' +
        '};\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();

    // Two methods named Next: the base virtual (lower line) and the override.
    const nexts = cg
      .getNodesByKind('method')
      .filter((n) => n.name === 'Next')
      .sort((a, b) => a.startLine - b.startLine);
    expect(nexts.length).toBe(2);
    const [baseNext, overrideNext] = nexts;

    // A vtable call to Iterator::Next dispatches to DBIter::Next — bridge it so
    // trace/callees from the interface method reaches the implementation.
    const edge = cg
      .getOutgoingEdges(baseNext!.id)
      .find((e) => e.target === overrideNext!.id && e.kind === 'calls');
    expect(edge, 'Iterator::Next should reach DBIter::Next via override synthesis').toBeDefined();

    cg.close();
  });
});

describe('Java end-to-end — field-injected bean trace (issue #389)', () => {
  let tmpDir: string | undefined;
  afterEach(() => {
    if (tmpDir) fs.rmSync(tmpDir, { recursive: true, force: true });
    tmpDir = undefined;
  });

  // Mirrors the issue's Spring MVC pattern:
  //   UserAction(@Resource UserBO userbo).toLogin2() -> this.userbo.toLogin2()
  //     -> UserBO.toLogin2() -> userService.toLogin() -> UserService.toLogin (iface)
  //     -> UserServiceImpl.toLogin() via interface→impl synthesis.
  // Without the extractor `this.` strip + field-typed receiver lookup, the very
  // first hop (controller -> bean) was missing entirely, breaking trace.
  it('connects controller -> @Resource bean -> interface -> impl end-to-end', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-spring-bean-'));
    const javaDir = path.join(tmpDir, 'src/main/java/com/example/user');
    fs.mkdirSync(path.join(javaDir, 'action'), { recursive: true });
    fs.mkdirSync(path.join(javaDir, 'bo'), { recursive: true });
    fs.mkdirSync(path.join(javaDir, 'service'), { recursive: true });
    fs.mkdirSync(path.join(javaDir, 'service/impl'), { recursive: true });
    fs.writeFileSync(
      path.join(tmpDir, 'pom.xml'),
      '<project><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency></dependencies></project>\n'
    );
    fs.writeFileSync(
      path.join(javaDir, 'action/UserAction.java'),
      'package com.example.user.action;\n' +
        'import com.example.user.bo.UserBO;\n' +
        'import javax.annotation.Resource;\n' +
        '@org.springframework.stereotype.Controller\n' +
        'public class UserAction {\n' +
        '  @Resource(name = "userBO") private UserBO userbo;\n' +
        '  public void toLogin2() { this.userbo.toLogin2(); }\n' +
        '}\n'
    );
    fs.writeFileSync(
      path.join(javaDir, 'bo/UserBO.java'),
      'package com.example.user.bo;\n' +
        'import com.example.user.service.UserService;\n' +
        'import javax.annotation.Resource;\n' +
        '@org.springframework.stereotype.Component("userBO")\n' +
        'public class UserBO {\n' +
        '  @Resource private UserService userService;\n' +
        '  public void toLogin2() { userService.toLogin(); }\n' +
        '}\n'
    );
    fs.writeFileSync(
      path.join(javaDir, 'service/UserService.java'),
      'package com.example.user.service;\n' +
        'public interface UserService { void toLogin(); }\n'
    );
    fs.writeFileSync(
      path.join(javaDir, 'service/impl/UserServiceImpl.java'),
      'package com.example.user.service.impl;\n' +
        'import com.example.user.service.UserService;\n' +
        '@org.springframework.stereotype.Service("userService")\n' +
        'public class UserServiceImpl implements UserService {\n' +
        '  public void toLogin() { }\n' +
        '}\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();

    const methods = cg.getNodesByKind('method');
    const find = (cls: string, name: string) =>
      methods.find((m) => m.name === name && m.filePath.endsWith(`${cls}.java`));

    const action = find('UserAction', 'toLogin2');
    const bo = find('UserBO', 'toLogin2');
    const svc = find('UserService', 'toLogin');
    const impl = find('UserServiceImpl', 'toLogin');
    expect(action).toBeDefined();
    expect(bo).toBeDefined();
    expect(svc).toBeDefined();
    expect(impl).toBeDefined();

    // UserAction.toLogin2 -> UserBO.toLogin2 (the regressed hop — `this.userbo`
    // receiver was emitted verbatim and the field-type lookup didn't exist).
    const actionToBo = cg.getOutgoingEdges(action!.id).find((e) => e.target === bo!.id);
    expect(actionToBo, 'controller `this.userbo.toLogin2()` should reach UserBO.toLogin2').toBeDefined();
    expect(actionToBo!.kind).toBe('calls');

    // UserBO.toLogin2 -> UserService.toLogin (plain identifier receiver, works pre-fix).
    const boToSvc = cg.getOutgoingEdges(bo!.id).find((e) => e.target === svc!.id);
    expect(boToSvc).toBeDefined();

    // UserService.toLogin -> UserServiceImpl.toLogin (interface->impl synth).
    const svcToImpl = cg.getOutgoingEdges(svc!.id).find((e) => e.target === impl!.id);
    expect(svcToImpl).toBeDefined();

    cg.close();
  });

  it('bridges a Java mapper interface method to its MyBatis XML statement (incl. SQL fragments)', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-mybatis-'));
    const javaDir = path.join(tmpDir, 'src/main/java/com/example/dao');
    const xmlDir = path.join(tmpDir, 'src/main/resources/mappers');
    fs.mkdirSync(javaDir, { recursive: true });
    fs.mkdirSync(xmlDir, { recursive: true });
    fs.writeFileSync(
      path.join(tmpDir, 'pom.xml'),
      '<project><dependencies><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId></dependency></dependencies></project>\n'
    );
    fs.writeFileSync(
      path.join(javaDir, 'UserDAOMapper.java'),
      'package com.example.dao;\n' +
        'public interface UserDAOMapper {\n' +
        '  Object getById(int id);\n' +
        '  int updateUser(Object u);\n' +
        '}\n'
    );
    fs.writeFileSync(
      path.join(xmlDir, 'UserDAOMapper.xml'),
      '<?xml version="1.0" encoding="UTF-8"?>\n' +
        '<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">\n' +
        '<mapper namespace="com.example.dao.UserDAOMapper">\n' +
        '  <sql id="userCols">id, name, email</sql>\n' +
        '  <select id="getById" parameterType="int" resultType="User">\n' +
        '    SELECT <include refid="userCols"/> FROM users WHERE id = #{id}\n' +
        '  </select>\n' +
        '  <update id="updateUser" parameterType="User">\n' +
        '    UPDATE users SET name=#{name}, email=#{email} WHERE id=#{id}\n' +
        '  </update>\n' +
        '</mapper>\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();

    const methods = cg.getNodesByKind('method');
    const getByIdJava = methods.find((m) => m.name === 'getById' && m.language === 'java');
    const getByIdXml = methods.find((m) => m.name === 'getById' && m.language === 'xml');
    const updateJava = methods.find((m) => m.name === 'updateUser' && m.language === 'java');
    const updateXml = methods.find((m) => m.name === 'updateUser' && m.language === 'xml');
    const sqlFrag = methods.find((m) => m.name === 'userCols' && m.language === 'xml');
    expect(getByIdJava).toBeDefined();
    expect(getByIdXml).toBeDefined();
    expect(updateJava).toBeDefined();
    expect(updateXml).toBeDefined();
    expect(sqlFrag).toBeDefined();

    // XML statement qualified name must be `<namespace>::<id>` so the
    // synthesizer can match against the Java method's `<Class>::<method>`
    // suffix — this is the load-bearing contract between extractor + synthesis.
    expect(getByIdXml!.qualifiedName).toBe('com.example.dao.UserDAOMapper::getById');

    // Bridge: Java mapper method -> XML statement, kind 'calls'.
    const j2xGet = cg.getOutgoingEdges(getByIdJava!.id).find((e) => e.target === getByIdXml!.id);
    expect(j2xGet, 'Java getById should reach the XML <select id="getById">').toBeDefined();
    expect(j2xGet!.kind).toBe('calls');
    const j2xUpd = cg.getOutgoingEdges(updateJava!.id).find((e) => e.target === updateXml!.id);
    expect(j2xUpd, 'Java updateUser should reach the XML <update id="updateUser">').toBeDefined();

    // <include refid="userCols"/> inside <select> -> <sql id="userCols"> in same mapper.
    const incEdge = cg.getOutgoingEdges(getByIdXml!.id).find((e) => e.target === sqlFrag!.id);
    expect(incEdge, '<include refid="userCols"/> should reach the <sql> fragment').toBeDefined();

    cg.close();
  });

  it('binds @Value / @ConfigurationProperties to YAML + .properties keys (incl. relaxed binding)', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-spring-config-'));
    const javaDir = path.join(tmpDir, 'src/main/java/com/example');
    const resDir = path.join(tmpDir, 'src/main/resources');
    fs.mkdirSync(javaDir, { recursive: true });
    fs.mkdirSync(resDir, { recursive: true });
    fs.writeFileSync(
      path.join(tmpDir, 'pom.xml'),
      '<project><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency></dependencies></project>\n'
    );
    fs.writeFileSync(
      path.join(resDir, 'application.yml'),
      'app:\n' +
        '  cache:\n' +
        '    name:\n' +
        '      user-token: "example-service:auth:token"\n' +
        '    enabled: true\n' +
        'db:\n' +
        '  url: "jdbc:mysql://localhost/x"\n'
    );
    fs.writeFileSync(
      path.join(resDir, 'application.properties'),
      'app.retry-count=3\n'
    );
    fs.writeFileSync(
      path.join(javaDir, 'CacheConfig.java'),
      'package com.example;\n' +
        'import org.springframework.beans.factory.annotation.Value;\n' +
        'public class CacheConfig {\n' +
        '  @Value("${app.cache.name.user-token}") private String tokenCacheName;\n' +
        '  @Value("${app.cache.enabled:true}") private boolean enabled;\n' +
        '  // relaxed binding: java camelCase, properties kebab-case\n' +
        '  @Value("${app.retryCount}") private int retry;\n' +
        '}\n'
    );
    fs.writeFileSync(
      path.join(javaDir, 'CacheProperties.java'),
      'package com.example;\n' +
        'import org.springframework.boot.context.properties.ConfigurationProperties;\n' +
        '@ConfigurationProperties(prefix = "app.cache")\n' +
        'public class CacheProperties { private boolean enabled; }\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();

    // YAML/properties leaf keys: one constant node per dotted path.
    const cfgKeys = cg
      .getNodesByKind('constant')
      .filter((n) => n.language === 'yaml' || n.language === 'properties');
    const cfgByQn = (qn: string) => cfgKeys.find((n) => n.qualifiedName === qn);
    expect(cfgByQn('app.cache.name.user-token')).toBeDefined();
    expect(cfgByQn('app.cache.enabled')).toBeDefined();
    expect(cfgByQn('db.url')).toBeDefined();
    expect(cfgByQn('app.retry-count')).toBeDefined();

    // @Value("${app.cache.name.user-token}") -> the YAML leaf key.
    const valueBindings = cg
      .getNodesByKind('constant')
      .filter((n) => n.id.startsWith('spring-value:'));
    const userToken = valueBindings.find((n) => n.name === 'app.cache.name.user-token');
    expect(userToken).toBeDefined();
    const userTokenEdges = cg.getOutgoingEdges(userToken!.id);
    const userTokenTarget = userTokenEdges.find((e) =>
      cfgKeys.some((c) => c.id === e.target && c.qualifiedName === 'app.cache.name.user-token'),
    );
    expect(userTokenTarget, '@Value should reference the YAML leaf key').toBeDefined();

    // Default-value form `${k:default}` — strip the `:default` and bind the key.
    const enabledBind = valueBindings.find((n) => n.name === 'app.cache.enabled');
    expect(enabledBind).toBeDefined();
    expect(cg.getOutgoingEdges(enabledBind!.id).some((e) => {
      const t = cfgByQn('app.cache.enabled');
      return t && e.target === t.id;
    })).toBe(true);

    // Relaxed binding: `app.retryCount` (camel) -> `app.retry-count` (kebab).
    const retryBind = valueBindings.find((n) => n.name === 'app.retryCount');
    expect(retryBind).toBeDefined();
    expect(cg.getOutgoingEdges(retryBind!.id).some((e) => {
      const t = cfgByQn('app.retry-count');
      return t && e.target === t.id;
    })).toBe(true);

    // @ConfigurationProperties(prefix="app.cache") -> a key under that prefix.
    const cpBindings = cg
      .getNodesByKind('constant')
      .filter((n) => n.id.startsWith('spring-cp:'));
    const cpAppCache = cpBindings.find((n) => n.name === 'app.cache');
    expect(cpAppCache).toBeDefined();
    const cpEdges = cg.getOutgoingEdges(cpAppCache!.id);
    expect(cpEdges.length).toBeGreaterThan(0);

    cg.close();
  });

  it('emits only a file node for non-MyBatis XML (pom.xml, beans.xml, log4j.xml)', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-xml-non-mybatis-'));
    fs.writeFileSync(
      path.join(tmpDir, 'pom.xml'),
      '<project><groupId>x</groupId><artifactId>y</artifactId></project>\n'
    );
    fs.writeFileSync(
      path.join(tmpDir, 'log4j.xml'),
      '<?xml version="1.0"?><Configuration><Loggers><Root level="info"/></Loggers></Configuration>\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();
    // No method nodes — non-mapper XML produces no symbols (just file rows).
    expect(cg.getNodesByKind('method').filter((n) => n.language === 'xml').length).toBe(0);
    cg.close();
  });

  it('resolves a `this.field.method()` call to a unique implementation class', async () => {
    // Standalone test of the extractor `this.` strip: even without Spring annotations,
    // `this.svc.run()` where `svc` is typed as a concrete class should route to that
    // class's method. This is the general Java fix, Spring is only one consumer.
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-java-this-field-'));
    fs.writeFileSync(
      path.join(tmpDir, 'App.java'),
      'class Svc { public void run() { } }\n' +
        'class App {\n' +
        '  private Svc svc;\n' +
        '  public void go() { this.svc.run(); }\n' +
        '}\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();

    const methods = cg.getNodesByKind('method');
    const go = methods.find((m) => m.name === 'go');
    const run = methods.find((m) => m.name === 'run');
    expect(go && run).toBeTruthy();

    const edge = cg.getOutgoingEdges(go!.id).find((e) => e.target === run!.id);
    expect(edge, '`this.svc.run()` should resolve to Svc.run').toBeDefined();

    cg.close();
  });
});

describe('JVM FQN imports — end-to-end', () => {
  let tmpDir: string | undefined;
  afterEach(() => {
    if (tmpDir) fs.rmSync(tmpDir, { recursive: true, force: true });
    tmpDir = undefined;
  });

  it('resolves a Kotlin import when the file name differs from the class name', async () => {
    // Bar lives in Models.kt — the filesystem-based Java-style path lookup
    // (com/example/Bar.kt) misses this; only FQN-via-qualifiedName finds it.
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-jvm-imp-'));
    fs.writeFileSync(
      path.join(tmpDir, 'Models.kt'),
      'package com.example\n\nclass Bar {\n  fun greet(): String = "hi"\n}\n'
    );
    fs.writeFileSync(
      path.join(tmpDir, 'Caller.kt'),
      'package com.example.app\n\nimport com.example.Bar\n\nclass App {\n  fun run() { Bar().greet() }\n}\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();

    const bar = cg.getNodesByKind('class').find((n) => n.qualifiedName === 'com.example::Bar');
    expect(bar, 'Bar should be extracted with package-qualified name').toBeDefined();

    const importNode = cg.getNodesByKind('import').find((n) => n.name === 'com.example.Bar');
    expect(importNode, 'import statement node should exist').toBeDefined();

    // The imports edge may originate from the import node OR from a parent
    // scope (file / namespace) — accept either, but require that an
    // imports-kind edge to Bar exists.
    const reachesBar = cg
      .getIncomingEdges(bar!.id)
      .find((e) => e.kind === 'imports');
    expect(reachesBar, 'an imports edge should resolve to Bar via FQN').toBeDefined();

    cg.close();
  });

  it('resolves a Kotlin top-level function import', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-jvm-imp-'));
    fs.writeFileSync(
      path.join(tmpDir, 'Utils.kt'),
      'package com.example\n\nfun util(): Int = 42\n'
    );
    fs.writeFileSync(
      path.join(tmpDir, 'Caller.kt'),
      'package com.example.app\n\nimport com.example.util\n\nfun main() { util() }\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();

    const util = cg.getNodesByKind('function').find((n) => n.qualifiedName === 'com.example::util');
    expect(util, 'top-level util() should be extracted under com.example').toBeDefined();

    const edge = cg.getIncomingEdges(util!.id).find((e) => e.kind === 'imports');
    expect(edge, 'imports edge should reach the top-level function by FQN').toBeDefined();
  });

  it('resolves cross-language: Kotlin importing a Java class', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-jvm-imp-'));
    fs.writeFileSync(
      path.join(tmpDir, 'JavaBar.java'),
      'package com.example;\n\npublic class JavaBar {\n  public String greet() { return "hi"; }\n}\n'
    );
    fs.writeFileSync(
      path.join(tmpDir, 'Caller.kt'),
      'package com.example.app\n\nimport com.example.JavaBar\n\nfun main() { JavaBar().greet() }\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();

    const javaBar = cg.getNodesByKind('class').find((n) => n.qualifiedName === 'com.example::JavaBar');
    expect(javaBar, 'JavaBar should be extracted under com.example regardless of language').toBeDefined();

    const edge = cg.getIncomingEdges(javaBar!.id).find((e) => e.kind === 'imports');
    expect(edge, 'Kotlin caller should resolve its import to the Java class').toBeDefined();
  });

  it('disambiguates a class-name collision across packages', async () => {
    // Two `Bar` classes in different packages — each importer should reach
    // ITS Bar, not the other one. This is the central failure mode that
    // name-matcher alone cannot disambiguate.
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-jvm-imp-'));
    fs.writeFileSync(
      path.join(tmpDir, 'AlphaBar.kt'),
      'package com.example.alpha\n\nclass Bar { fun who() = "alpha" }\n'
    );
    fs.writeFileSync(
      path.join(tmpDir, 'BetaBar.kt'),
      'package com.example.beta\n\nclass Bar { fun who() = "beta" }\n'
    );
    fs.writeFileSync(
      path.join(tmpDir, 'CallerA.kt'),
      'package app\n\nimport com.example.alpha.Bar\n\nfun a() { Bar().who() }\n'
    );
    fs.writeFileSync(
      path.join(tmpDir, 'CallerB.kt'),
      'package app\n\nimport com.example.beta.Bar\n\nfun b() { Bar().who() }\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();

    const alphaBar = cg.getNodesByKind('class').find((n) => n.qualifiedName === 'com.example.alpha::Bar');
    const betaBar = cg.getNodesByKind('class').find((n) => n.qualifiedName === 'com.example.beta::Bar');
    expect(alphaBar).toBeDefined();
    expect(betaBar).toBeDefined();
    expect(alphaBar!.id).not.toBe(betaBar!.id);

    // Each Bar receives exactly one imports edge — from its own caller.
    const alphaIncoming = cg.getIncomingEdges(alphaBar!.id).filter((e) => e.kind === 'imports');
    const betaIncoming = cg.getIncomingEdges(betaBar!.id).filter((e) => e.kind === 'imports');
    expect(alphaIncoming.length).toBeGreaterThan(0);
    expect(betaIncoming.length).toBeGreaterThan(0);

    // Sanity: the edges don't cross — alpha's incoming sources don't include
    // beta's filePath and vice versa.
    const sourceFiles = (edges: typeof alphaIncoming) =>
      edges.map((e) => cg.getNode(e.source)?.filePath).filter(Boolean);
    expect(sourceFiles(alphaIncoming).some((p) => p?.includes('CallerA.kt'))).toBe(true);
    expect(sourceFiles(betaIncoming).some((p) => p?.includes('CallerB.kt'))).toBe(true);
  });
});

describe('Java anonymous-class override synthesis — end-to-end', () => {
  let tmpDir: string | undefined;
  afterEach(() => {
    if (tmpDir) fs.rmSync(tmpDir, { recursive: true, force: true });
    tmpDir = undefined;
  });

  it('bridges an abstract base method to overrides inside `new Base() { ... }`', async () => {
    // Mirrors guava Splitter: a factory returns `new BaseIter() {
    // @Override int separatorStart(...) { ... } }`. Without anon-class
    // extraction the override is invisible — Phase 5.5 interface-impl
    // has no class to bridge — and an agent investigating `BaseIter.separatorStart`
    // can't see its real implementation without reading the file.
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-anon-java-'));
    fs.writeFileSync(
      path.join(tmpDir, 'Splitter.java'),
      'package com.example;\n' +
        '\n' +
        'abstract class BaseIter {\n' +
        '  abstract int separatorStart(int start);\n' +
        '}\n' +
        '\n' +
        'public class Splitter {\n' +
        '  public BaseIter make() {\n' +
        '    return new BaseIter() {\n' +
        '      @Override\n' +
        '      int separatorStart(int start) { return start + 1; }\n' +
        '    };\n' +
        '  }\n' +
        '}\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();

    // The anon class is extracted and contains the override.
    const anonClass = cg
      .getNodesByKind('class')
      .find((n) => /BaseIter\$anon@/.test(n.name));
    expect(anonClass, 'anonymous BaseIter subclass should be a class node').toBeDefined();

    const baseAbstract = cg
      .getNodesByKind('method')
      .find((n) => n.qualifiedName === 'com.example::BaseIter::separatorStart');
    const anonOverride = cg
      .getNodesByKind('method')
      .find(
        (n) =>
          n.name === 'separatorStart' &&
          n.qualifiedName.includes('$anon@') &&
          n.qualifiedName.startsWith('com.example::Splitter::make::')
      );
    expect(baseAbstract, 'base abstract method should be in the graph').toBeDefined();
    expect(anonOverride, 'anon-class override should be in the graph').toBeDefined();

    // Phase 5.5 interface-impl: the abstract method has a synthesized
    // `calls` edge to the anon override. Without this hop the agent
    // would have to Read the file to discover the implementation.
    const synthEdge = cg
      .getOutgoingEdges(baseAbstract!.id)
      .find((e) => e.target === anonOverride!.id && e.kind === 'calls');
    expect(synthEdge, 'BaseIter.separatorStart should bridge to anon.separatorStart').toBeDefined();
    expect(synthEdge!.provenance).toBe('heuristic');
    expect((synthEdge!.metadata as { synthesizedBy?: string } | undefined)?.synthesizedBy).toBe(
      'interface-impl'
    );

    cg.close();
  });
});

describe('Go gRPC stub→impl synthesis', () => {
  let tmpDir: string | undefined;
  afterEach(() => {
    if (tmpDir) fs.rmSync(tmpDir, { recursive: true, force: true });
    tmpDir = undefined;
  });

  it('bridges UnimplementedMsgServer methods to the hand-written keeper impl', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-go-grpc-'));
    // Mimic protoc-gen-go-grpc output: `*_grpc.pb.go` carrying the
    // UnimplementedMsgServer stub.
    fs.writeFileSync(
      path.join(tmpDir, 'tx_grpc.pb.go'),
      'package banktypes\n\n' +
        'type UnimplementedMsgServer struct{}\n\n' +
        'func (UnimplementedMsgServer) Send(ctx context.Context, req *MsgSend) (*MsgSendResponse, error) { return nil, nil }\n' +
        'func (UnimplementedMsgServer) MultiSend(ctx context.Context, req *MsgMultiSend) (*MsgMultiSendResponse, error) { return nil, nil }\n' +
        'func (UnimplementedMsgServer) mustEmbedUnimplementedMsgServer() {}\n' +
        'func (UnimplementedMsgServer) testEmbeddedByValue() {}\n'
    );
    // Hand-written impl in a non-generated file — what an agent actually
    // wants the trace to land on.
    fs.writeFileSync(
      path.join(tmpDir, 'msg_server.go'),
      'package keeper\n\n' +
        'type msgServer struct{ k Keeper }\n\n' +
        'func (m msgServer) Send(ctx context.Context, req *MsgSend) (*MsgSendResponse, error) {\n' +
        '  return m.k.SendCoins(ctx, req.From, req.To, req.Amount)\n' +
        '}\n' +
        'func (m msgServer) MultiSend(ctx context.Context, req *MsgMultiSend) (*MsgMultiSendResponse, error) {\n' +
        '  return nil, nil\n' +
        '}\n'
    );

    let cg: CodeGraph | undefined;
    try {
      cg = CodeGraph.initSync(tmpDir);
      await cg.indexAll();

      const stubSend = cg
        .getNodesByKind('method')
        .find((n) => n.qualifiedName.endsWith('UnimplementedMsgServer::Send'));
      const implSend = cg
        .getNodesByKind('method')
        .find((n) => n.qualifiedName.endsWith('msgServer::Send'));
      expect(stubSend, 'UnimplementedMsgServer.Send should be indexed').toBeDefined();
      expect(implSend, 'msgServer.Send should be indexed').toBeDefined();

      const bridge = cg
        .getOutgoingEdges(stubSend!.id)
        .find((e) => e.target === implSend!.id && e.kind === 'calls');
      expect(bridge, 'stub Send should bridge to impl Send').toBeDefined();
      expect(bridge!.provenance).toBe('heuristic');
      expect((bridge!.metadata as { synthesizedBy?: string } | undefined)?.synthesizedBy).toBe(
        'go-grpc-stub-impl'
      );
    } finally {
      cg?.close();
    }
  });

  it('does not bridge to candidates living in another generated file', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-go-grpc-sib-'));
    // `*_grpc.pb.go` also contains a sibling `msgClient` struct that
    // happens to satisfy the same method set. We must NOT bridge to it —
    // it's not the hand-written impl, just the gRPC client wrapper.
    fs.writeFileSync(
      path.join(tmpDir, 'tx_grpc.pb.go'),
      'package banktypes\n\n' +
        'type UnimplementedMsgServer struct{}\n' +
        'func (UnimplementedMsgServer) Send() {}\n' +
        'func (UnimplementedMsgServer) MultiSend() {}\n\n' +
        'type msgClient struct{}\n' +
        'func (m msgClient) Send() {}\n' +
        'func (m msgClient) MultiSend() {}\n'
    );

    let cg: CodeGraph | undefined;
    try {
      cg = CodeGraph.initSync(tmpDir);
      await cg.indexAll();

      const stub = cg
        .getNodesByKind('struct')
        .find((n) => n.name === 'UnimplementedMsgServer');
      expect(stub).toBeDefined();
      const bridges = cg
        .getNodesByKind('method')
        .filter((n) => n.qualifiedName.endsWith('UnimplementedMsgServer::Send'))
        .flatMap((stubSend) => cg!.getOutgoingEdges(stubSend.id))
        .filter(
          (e) =>
            e.kind === 'calls' &&
            (e.metadata as { synthesizedBy?: string } | undefined)?.synthesizedBy ===
              'go-grpc-stub-impl',
        );
      expect(bridges, 'no bridge to msgClient (also generated)').toHaveLength(0);
    } finally {
      cg?.close();
    }
  });
});

describe('React Router end-to-end route extraction (.tsx/.jsx)', () => {
  let tmpDir: string | undefined;
  afterEach(() => {
    if (tmpDir) fs.rmSync(tmpDir, { recursive: true, force: true });
    tmpDir = undefined;
  });

  // Regression for the resolver language-gate bug: the `react` resolver's
  // `extract()` was filtered out of the .tsx/.jsx grammars, so `<Route>` routes
  // — which only live in JSX files — were never indexed through the real
  // indexing path (the unit tests call extract() directly and so missed this).
  it('indexes <Route element={<X/>}> routes from a .tsx file and links them to the component', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-rr-'));
    fs.writeFileSync(
      path.join(tmpDir, 'package.json'),
      '{"dependencies":{"react":"^18.0.0","react-router-dom":"^6.0.0"}}'
    );
    fs.writeFileSync(
      path.join(tmpDir, 'Home.tsx'),
      'export function Home() { return null; }\n'
    );
    fs.writeFileSync(
      path.join(tmpDir, 'routes.tsx'),
      `import { Routes, Route } from 'react-router-dom';
import { Home } from './Home';
export function AppRoutes() {
  return (
    <Routes>
      <Route path="/home" element={<Home/>} />
    </Routes>
  );
}
`
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();
    try {
      // The route node from the .tsx file exists (the bug: it didn't).
      const route = cg.getNodesByKind('route').find((n) => n.name === '/home');
      expect(route, '/home route from .tsx should be indexed').toBeDefined();

      // ...and it links to the Home component.
      const home = cg.getNodesByName('Home').find((n) => n.kind === 'function');
      expect(home).toBeDefined();
      const toHome = cg.getOutgoingEdges(route!.id).find((e) => e.target === home!.id);
      expect(toHome, 'route → Home component edge').toBeDefined();
    } finally {
      cg.close();
    }
  });
});

describe('Terraform end-to-end module-boundary resolution', () => {
  let tmpDir: string | undefined;
  afterEach(() => {
    if (tmpDir) fs.rmSync(tmpDir, { recursive: true, force: true });
    tmpDir = undefined;
  });

  function writeMultiModuleRepo(root: string) {
    fs.mkdirSync(path.join(root, 'modules/vpc'), { recursive: true });
    fs.mkdirSync(path.join(root, 'modules/other'), { recursive: true });
    fs.mkdirSync(path.join(root, 'envs'), { recursive: true });
    fs.writeFileSync(
      path.join(root, 'main.tf'),
      'variable "vpc_cidr" {\n  type = string\n}\n\n' +
        'module "vpc" {\n  source = "./modules/vpc"\n  cidr   = var.vpc_cidr\n}\n\n' +
        'module "registry_thing" {\n  source  = "terraform-aws-modules/s3-bucket/aws"\n  bucket  = "x"\n}\n\n' +
        'output "vpc_id" {\n  value = module.vpc.vpc_id\n}\n'
    );
    fs.writeFileSync(
      path.join(root, 'modules/vpc/variables.tf'),
      'variable "cidr" {\n  type = string\n}\n'
    );
    fs.writeFileSync(
      path.join(root, 'modules/vpc/main.tf'),
      'resource "aws_vpc" "this" {\n  cidr_block = var.cidr\n}\n'
    );
    fs.writeFileSync(
      path.join(root, 'modules/vpc/outputs.tf'),
      'output "vpc_id" {\n  value = aws_vpc.this.id\n}\n'
    );
    // Same-named variable in an UNRELATED module — must never receive edges
    // from outside its own directory.
    fs.writeFileSync(
      path.join(root, 'modules/other/variables.tf'),
      'variable "cidr" {\n  type = string\n}\nvariable "orphan_ref_target" {}\n'
    );
    // References a variable that has no same-dir declaration: must stay unlinked.
    fs.writeFileSync(
      path.join(root, 'modules/other/main.tf'),
      'resource "aws_eip" "e" {\n  tags = { Name = var.undeclared_here_elsewhere_yes }\n}\n'
    );
    fs.writeFileSync(path.join(root, 'envs/prod.tfvars'), 'vpc_cidr = "10.0.0.0/16"\n');
  }

  it('bridges module inputs/outputs/source and enforces directory scoping', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-terraform-'));
    writeMultiModuleRepo(tmpDir);

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();
    try {
      const byQname = (q: string, file?: string) =>
        cg
          .getNodesByName(q.split('.').pop()!)
          .filter((n) => n.qualifiedName === q && (!file || n.filePath === file));

      const moduleDecl = byQname('module.vpc')[0];
      expect(moduleDecl, 'module.vpc declaration node').toBeDefined();
      const childCidr = byQname('var.cidr', 'modules/vpc/variables.tf')[0];
      expect(childCidr, "child module's var.cidr").toBeDefined();
      const childOutput = byQname('output.vpc_id', 'modules/vpc/outputs.tf')[0];
      expect(childOutput, "child module's output.vpc_id").toBeDefined();
      const rootOutput = byQname('output.vpc_id', 'main.tf')[0];
      expect(rootOutput, 'root output.vpc_id').toBeDefined();

      const declEdges = cg.getOutgoingEdges(moduleDecl!.id);
      // Input wiring: module block → child variable (cross-directory).
      expect(
        declEdges.find((e) => e.target === childCidr!.id),
        'module.vpc → child var.cidr input edge'
      ).toBeDefined();
      // Source wiring: module block → child entry file.
      const fileNode = cg
        .getNodesInFile('modules/vpc/main.tf')
        .find((n) => n.kind === 'file');
      expect(fileNode).toBeDefined();
      const importEdge = declEdges.find((e) => e.target === fileNode!.id);
      expect(importEdge, 'module.vpc → modules/vpc/main.tf imports edge').toBeDefined();
      expect(importEdge!.kind).toBe('imports');

      // Output bridge: root output → child output (not just the declaration).
      const rootOutEdges = cg.getOutgoingEdges(rootOutput!.id);
      expect(
        rootOutEdges.find((e) => e.target === childOutput!.id),
        'root output.vpc_id → child output.vpc_id'
      ).toBeDefined();
      expect(
        rootOutEdges.find((e) => e.target === moduleDecl!.id),
        'root output.vpc_id → module.vpc declaration'
      ).toBeDefined();

      // tfvars assignment walks up to the ROOT variable.
      const rootVar = byQname('var.vpc_cidr', 'main.tf')[0];
      expect(rootVar).toBeDefined();
      const tfvarsFile = cg.getNodesInFile('envs/prod.tfvars').find((n) => n.kind === 'file');
      expect(tfvarsFile).toBeDefined();
      expect(
        cg.getOutgoingEdges(tfvarsFile!.id).find((e) => e.target === rootVar!.id),
        'envs/prod.tfvars → var.vpc_cidr'
      ).toBeDefined();

      // Directory scoping: the unrelated module's same-named var.cidr gets
      // NO incoming edges from outside its own directory…
      const otherCidr = byQname('var.cidr', 'modules/other/variables.tf')[0];
      expect(otherCidr).toBeDefined();
      const incomingOther = cg.getIncomingEdges(otherCidr!.id).filter((e) => e.kind !== 'contains');
      expect(incomingOther, 'unrelated module var.cidr must stay isolated').toHaveLength(0);

      // …and a reference with no same-dir declaration stays unlinked rather
      // than borrowing another module's declaration.
      const orphanEdges = cg
        .getNodesInFile('modules/other/main.tf')
        .filter((n) => n.qualifiedName === 'aws_eip.e')
        .flatMap((n) => cg.getOutgoingEdges(n.id))
        .filter((e) => e.kind === 'references');
      const orphanTargets = orphanEdges.map((e) => cg.getNode(e.target)?.qualifiedName);
      expect(orphanTargets).not.toContain('var.undeclared_here_elsewhere_yes');

      // Registry-sourced module: inputs stay unresolved (no guessed edges).
      const registryDecl = byQname('module.registry_thing')[0];
      expect(registryDecl).toBeDefined();
      const registryEdges = cg
        .getOutgoingEdges(registryDecl!.id)
        .filter((e) => e.kind !== 'contains');
      expect(registryEdges, 'registry module must not link anywhere').toHaveLength(0);
    } finally {
      cg.close();
    }
  });
});

describe('Terraform follow-ups: remote-state bridge, provider alias, moved blocks', () => {
  let tmpDir: string | undefined;
  afterEach(() => {
    if (tmpDir) fs.rmSync(tmpDir, { recursive: true, force: true });
    tmpDir = undefined;
  });

  it('bridges atmos remote-state to the target component, resolves provider aliases up the tree, links moved blocks', async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-terraform-fu-'));
    // Component producing state.
    fs.mkdirSync(path.join(tmpDir, 'components/terraform/vpc'), { recursive: true });
    fs.writeFileSync(
      path.join(tmpDir, 'components/terraform/vpc/outputs.tf'),
      'output "vpc_id" {\n  value = "vpc-123"\n}\n'
    );
    // Component consuming it via the cloudposse remote-state module.
    fs.mkdirSync(path.join(tmpDir, 'components/terraform/eks/cluster'), { recursive: true });
    fs.writeFileSync(
      path.join(tmpDir, 'components/terraform/eks/cluster/remote-state.tf'),
      'module "vpc" {\n' +
        '  source    = "cloudposse/stack-config/yaml//modules/remote-state"\n' +
        '  component = var.vpc_component_name\n' +
        '}\n' +
        'variable "vpc_component_name" {\n' +
        '  type    = string\n' +
        '  default = "vpc"\n' +
        '}\n'
    );
    fs.writeFileSync(
      path.join(tmpDir, 'components/terraform/eks/cluster/main.tf'),
      'resource "aws_eks_cluster" "this" {\n  vpc_id = module.vpc.outputs.vpc_id\n}\n'
    );
    // Ambiguous component name — two directories called "dns" with the same
    // output; the bridge must refuse to pick one.
    fs.mkdirSync(path.join(tmpDir, 'components/terraform/dns'), { recursive: true });
    fs.mkdirSync(path.join(tmpDir, 'legacy/dns'), { recursive: true });
    fs.writeFileSync(path.join(tmpDir, 'components/terraform/dns/outputs.tf'), 'output "zone_id" {\n  value = "z1"\n}\n');
    fs.writeFileSync(path.join(tmpDir, 'legacy/dns/outputs.tf'), 'output "zone_id" {\n  value = "z2"\n}\n');
    fs.writeFileSync(
      path.join(tmpDir, 'components/terraform/eks/cluster/dns.tf'),
      'module "dns" {\n' +
        '  source    = "cloudposse/stack-config/yaml//modules/remote-state"\n' +
        '  component = "dns"\n' +
        '}\n' +
        'output "zone" {\n  value = module.dns.outputs.zone_id\n}\n'
    );
    // Provider alias declared at the root, selected inside a module dir.
    fs.writeFileSync(
      path.join(tmpDir, 'providers.tf'),
      'provider "aws" {\n  region = "us-east-1"\n}\n' +
        'provider "aws" {\n  alias  = "east"\n  region = "us-east-2"\n}\n'
    );
    fs.mkdirSync(path.join(tmpDir, 'modules/app'), { recursive: true });
    fs.writeFileSync(
      path.join(tmpDir, 'modules/app/main.tf'),
      'resource "aws_s3_bucket" "b" {\n  provider = aws.east\n  bucket   = "x"\n}\n'
    );
    // Moved block referencing a live resource.
    fs.writeFileSync(
      path.join(tmpDir, 'main.tf'),
      'resource "aws_instance" "renamed" {}\n' +
        'moved {\n  from = aws_instance.old\n  to   = aws_instance.renamed\n}\n'
    );

    const cg = CodeGraph.initSync(tmpDir);
    await cg.indexAll();
    try {
      const byQname = (q: string, file?: string) =>
        cg
          .getNodesByName(q.split('.').pop()!)
          .filter((n) => n.qualifiedName === q && (!file || n.filePath === file));

      // 1. remote-state bridge: consumer resource → producer component's output.
      const consumer = byQname('aws_eks_cluster.this')[0] ??
        cg.getNodesInFile('components/terraform/eks/cluster/main.tf').find((n) => n.qualifiedName === 'aws_eks_cluster.this');
      expect(consumer, 'consumer resource').toBeDefined();
      const producerOut = byQname('output.vpc_id', 'components/terraform/vpc/outputs.tf')[0];
      expect(producerOut, "producer component's output").toBeDefined();
      expect(
        cg.getOutgoingEdges(consumer!.id).find((e) => e.target === producerOut!.id),
        'remote-state bridge edge eks/cluster → vpc output'
      ).toBeDefined();

      // 2. Ambiguous component name → no bridge edge to either candidate.
      const zoneOut = byQname('output.zone', 'components/terraform/eks/cluster/dns.tf')[0];
      expect(zoneOut).toBeDefined();
      const zoneTargets = cg
        .getOutgoingEdges(zoneOut!.id)
        .map((e) => cg.getNode(e.target))
        .filter((n) => n?.qualifiedName === 'output.zone_id');
      expect(zoneTargets, 'ambiguous component must not be guessed').toHaveLength(0);

      // 3. Provider alias: nodes are distinct, and the selection inside the
      //    module resolves up the tree to the aliased configuration.
      const provNodes = cg.getNodesInFile('providers.tf');
      const aliased = provNodes.find((n) => n.qualifiedName === 'provider.aws.east');
      const defaultProv = provNodes.find((n) => n.qualifiedName === 'provider.aws');
      expect(aliased, 'aliased provider node').toBeDefined();
      expect(defaultProv, 'default provider node').toBeDefined();
      const bucket = cg.getNodesInFile('modules/app/main.tf').find((n) => n.qualifiedName === 'aws_s3_bucket.b');
      expect(bucket).toBeDefined();
      const bucketEdges = cg.getOutgoingEdges(bucket!.id);
      expect(
        bucketEdges.find((e) => e.target === aliased!.id),
        'provider = aws.east → aliased provider (ancestor walk)'
      ).toBeDefined();
      expect(bucketEdges.find((e) => e.target === defaultProv!.id), 'must not link the default provider').toBeUndefined();

      // 4. moved block: the file references the live resource.
      const renamed = cg.getNodesInFile('main.tf').find((n) => n.qualifiedName === 'aws_instance.renamed');
      expect(renamed).toBeDefined();
      const rootFile = cg.getNodesInFile('main.tf').find((n) => n.kind === 'file');
      expect(
        cg.getOutgoingEdges(rootFile!.id).find((e) => e.target === renamed!.id),
        'moved block → live resource edge'
      ).toBeDefined();
    } finally {
      cg.close();
    }
  });
});