/**
 * P1 Integration Tests: Tree-sitter Parsing
 *
 * Tests parsing of sample files via tree-sitter.
 * Covers hardening fixes: Swift init constructor (#18),
 * PHP export detection (#20), symbol ID with startLine (#19),
 * definition node range (#22).
 */
import { describe, it, expect } from 'vitest';
import fs from 'fs/promises';
import path from 'path';
import { loadParser, loadLanguage } from '../../src/core/tree-sitter/parser-loader.js';
import { getLanguageFromFilename, SupportedLanguages } from 'gitnexus-shared';
import { getProvider } from '../../src/core/ingestion/languages/index.js';

const FIXTURES_DIR = path.join(process.cwd(), 'test', 'fixtures', 'sample-code');

// Test helper: replaces the removed isNodeExported wrapper using the provider pattern.
function isNodeExported(node: any, name: string, language: string): boolean {
  const provider = (getProvider as any)(language);
  if (!provider) return false;
  return provider.exportChecker(node, name);
}

/**
 * Minimal mock of a tree-sitter AST node.
 */
function mockNode(
  type: string,
  text: string = '',
  parent?: any,
  children?: any[],
  fields?: Record<string, any>,
): any {
  const node: any = {
    type,
    text,
    parent: parent || null,
    childCount: children?.length ?? 0,
    child: (i: number) => children?.[i] ?? null,
    childForFieldName: (name: string) => fields?.[name] ?? null,
  };
  // Set parent references on children
  if (children) {
    for (const child of children) {
      child.parent = node;
    }
  }
  return node;
}

// ─── isNodeExported per-language ─────────────────────────────────────

describe('parsing', () => {
  describe('isNodeExported', () => {
    // TypeScript/JavaScript
    describe('typescript', () => {
      it('returns true when ancestor is export_statement', () => {
        const exportStmt = mockNode('export_statement', 'export function foo() {}');
        const fnDecl = mockNode('function_declaration', 'function foo() {}', exportStmt);
        const nameNode = mockNode('identifier', 'foo', fnDecl);
        expect(isNodeExported(nameNode, 'foo', 'typescript')).toBe(true);
      });

      it('returns false for non-exported function', () => {
        const fnDecl = mockNode('function_declaration', 'function foo() {}');
        const nameNode = mockNode('identifier', 'foo', fnDecl);
        expect(isNodeExported(nameNode, 'foo', 'typescript')).toBe(false);
      });

      it('returns true when text starts with "export "', () => {
        const parent = mockNode('lexical_declaration', 'export const foo = 1');
        const nameNode = mockNode('identifier', 'foo', parent);
        expect(isNodeExported(nameNode, 'foo', 'typescript')).toBe(true);
      });
    });

    // Python
    describe('python', () => {
      it('public function (no underscore prefix)', () => {
        const node = mockNode('identifier', 'public_function');
        expect(isNodeExported(node, 'public_function', 'python')).toBe(true);
      });

      it('private function (underscore prefix)', () => {
        const node = mockNode('identifier', '_private_helper');
        expect(isNodeExported(node, '_private_helper', 'python')).toBe(false);
      });

      it('dunder method is private', () => {
        const node = mockNode('identifier', '__init__');
        expect(isNodeExported(node, '__init__', 'python')).toBe(false);
      });
    });

    // Go
    describe('go', () => {
      it('uppercase first letter is exported', () => {
        const node = mockNode('identifier', 'ExportedFunction');
        expect(isNodeExported(node, 'ExportedFunction', 'go')).toBe(true);
      });

      it('lowercase first letter is unexported', () => {
        const node = mockNode('identifier', 'unexportedFunction');
        expect(isNodeExported(node, 'unexportedFunction', 'go')).toBe(false);
      });

      it('empty name is not exported', () => {
        const node = mockNode('identifier', '');
        expect(isNodeExported(node, '', 'go')).toBe(false);
      });
    });

    // Rust
    describe('rust', () => {
      it('pub function is exported', () => {
        const visMod = mockNode('visibility_modifier', 'pub');
        const nameNode = mockNode('identifier', 'foo');
        // visibility_modifier is a sibling of the name inside function_item
        const fnDecl = mockNode('function_item', 'pub fn foo() {}', undefined, [visMod, nameNode]);
        expect(isNodeExported(nameNode, 'foo', 'rust')).toBe(true);
      });

      it('non-pub function is not exported', () => {
        const nameNode = mockNode('identifier', 'foo');
        const fnDecl = mockNode('function_item', 'fn foo() {}', undefined, [nameNode]);
        expect(isNodeExported(nameNode, 'foo', 'rust')).toBe(false);
      });
    });

    // PHP (hardening fix #20)
    describe('php', () => {
      it('top-level function is exported (globally accessible)', () => {
        // PHP: top-level functions fall through all checks and return true
        const program = mockNode('program', '<?php function topLevel() {}');
        const fnDecl = mockNode('function_definition', 'function topLevel() {}', program);
        const nameNode = mockNode('name', 'topLevel', fnDecl);
        expect(isNodeExported(nameNode, 'topLevel', 'php')).toBe(true);
      });

      it('class declaration is exported', () => {
        const classDecl = mockNode('class_declaration', 'class Foo {}');
        const nameNode = mockNode('name', 'Foo', classDecl);
        expect(isNodeExported(nameNode, 'Foo', 'php')).toBe(true);
      });

      it('public method has visibility_modifier = public', () => {
        const visMod = mockNode('visibility_modifier', 'public');
        const nameNode = mockNode('name', 'addUser', visMod);
        expect(isNodeExported(nameNode, 'addUser', 'php')).toBe(true);
      });

      it('private method has visibility_modifier = private', () => {
        const visMod = mockNode('visibility_modifier', 'private');
        const nameNode = mockNode('name', 'validate', visMod);
        expect(isNodeExported(nameNode, 'validate', 'php')).toBe(false);
      });
    });

    // Swift
    describe('swift', () => {
      it('public function is exported', () => {
        const visMod = mockNode('modifiers', 'public');
        const nameNode = mockNode('identifier', 'getCount', visMod);
        expect(isNodeExported(nameNode, 'getCount', 'swift')).toBe(true);
      });

      it('open function is exported', () => {
        const visMod = mockNode('modifiers', 'open');
        const nameNode = mockNode('identifier', 'doStuff', visMod);
        expect(isNodeExported(nameNode, 'doStuff', 'swift')).toBe(true);
      });

      it('non-public (internal) function is exported (Swift default is module-scoped)', () => {
        const fnDecl = mockNode('function_declaration', 'func helper() {}');
        const nameNode = mockNode('identifier', 'helper', fnDecl);
        expect(isNodeExported(nameNode, 'helper', 'swift')).toBe(true);
      });
    });

    // C/C++
    describe('c/cpp', () => {
      it('C functions without static are exported (external linkage)', () => {
        const nameNode = mockNode('identifier', 'add');
        const fnDef = mockNode('function_definition', 'int add(int a, int b) {}', undefined, [
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'add', 'c')).toBe(true);
      });

      it('C++ functions without static are exported', () => {
        const nameNode = mockNode('identifier', 'helperFunction');
        const fnDef = mockNode('function_definition', 'void helperFunction() {}', undefined, [
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'helperFunction', 'cpp')).toBe(true);
      });

      it('static C function is not exported', () => {
        const nameNode = mockNode('identifier', 'internalHelper');
        const staticSpec = mockNode('storage_class_specifier', 'static');
        const fnDef = mockNode(
          'function_definition',
          'static void internalHelper() {}',
          undefined,
          [staticSpec, nameNode],
        );
        expect(isNodeExported(nameNode, 'internalHelper', 'c')).toBe(false);
      });
    });

    // C#
    describe('csharp', () => {
      it('public modifier means exported', () => {
        const modifier = mockNode('modifier', 'public');
        const nameNode = mockNode('identifier', 'Add');
        // modifier is a sibling of nameNode inside method_declaration
        const methodDecl = mockNode('method_declaration', 'public int Add() {}', undefined, [
          modifier,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'Add', 'csharp')).toBe(true);
      });

      it('no public modifier means not exported', () => {
        const nameNode = mockNode('identifier', 'Helper');
        const classDecl = mockNode('class_declaration', 'class Helper {}', undefined, [nameNode]);
        expect(isNodeExported(nameNode, 'Helper', 'csharp')).toBe(false);
      });
    });

    // Java
    describe('java', () => {
      it('public method is exported', () => {
        const modifiers = mockNode('modifiers', 'public');
        const nameNode = mockNode('identifier', 'getUser');
        const methodDecl = mockNode('method_declaration', 'public User getUser() {}', undefined, [
          modifiers,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'getUser', 'java')).toBe(true);
      });

      it('public class method via text check is exported', () => {
        const nameNode = mockNode('identifier', 'doGet');
        const methodDecl = mockNode('method_declaration', 'public void doGet() {}', undefined, [
          nameNode,
        ]);
        // text starts with 'public' so it should be detected
        expect(isNodeExported(nameNode, 'doGet', 'java')).toBe(true);
      });

      it('private method is not exported', () => {
        const modifiers = mockNode('modifiers', 'private');
        const nameNode = mockNode('identifier', 'helper');
        const methodDecl = mockNode('method_declaration', 'private void helper() {}', undefined, [
          modifiers,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'helper', 'java')).toBe(false);
      });

      it('package-private (no modifier) is not exported', () => {
        const nameNode = mockNode('identifier', 'internal');
        const methodDecl = mockNode('method_declaration', 'void internal() {}', undefined, [
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'internal', 'java')).toBe(false);
      });
    });

    // Kotlin
    describe('kotlin', () => {
      it('function without visibility modifier is public by default', () => {
        const nameNode = mockNode('identifier', 'greet');
        const fnDecl = mockNode('function_declaration', 'fun greet() {}', undefined, [nameNode]);
        expect(isNodeExported(nameNode, 'greet', 'kotlin')).toBe(true);
      });

      it('public function is exported', () => {
        const visMod = mockNode('visibility_modifier', 'public');
        const modifiers = mockNode('modifiers', 'public', undefined, [visMod]);
        const nameNode = mockNode('identifier', 'greet');
        const fnDecl = mockNode('function_declaration', 'public fun greet() {}', undefined, [
          modifiers,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'greet', 'kotlin')).toBe(true);
      });

      it('private function is not exported', () => {
        const visMod = mockNode('visibility_modifier', 'private');
        const modifiers = mockNode('modifiers', 'private', undefined, [visMod]);
        const nameNode = mockNode('identifier', 'secret');
        const fnDecl = mockNode('function_declaration', 'private fun secret() {}', undefined, [
          modifiers,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'secret', 'kotlin')).toBe(false);
      });

      it('internal function is not exported', () => {
        const visMod = mockNode('visibility_modifier', 'internal');
        const modifiers = mockNode('modifiers', 'internal', undefined, [visMod]);
        const nameNode = mockNode('identifier', 'moduleOnly');
        const fnDecl = mockNode('function_declaration', 'internal fun moduleOnly() {}', undefined, [
          modifiers,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'moduleOnly', 'kotlin')).toBe(false);
      });
    });

    // C# additional cases
    describe('csharp additional', () => {
      it('internal modifier is not exported', () => {
        const modifier = mockNode('modifier', 'internal');
        const nameNode = mockNode('identifier', 'InternalService');
        const classDecl = mockNode(
          'class_declaration',
          'internal class InternalService {}',
          undefined,
          [modifier, nameNode],
        );
        expect(isNodeExported(nameNode, 'InternalService', 'csharp')).toBe(false);
      });

      it('private modifier is not exported', () => {
        const modifier = mockNode('modifier', 'private');
        const nameNode = mockNode('identifier', 'helper');
        const methodDecl = mockNode('method_declaration', 'private void helper() {}', undefined, [
          modifier,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'helper', 'csharp')).toBe(false);
      });

      it('struct with public modifier is exported', () => {
        const modifier = mockNode('modifier', 'public');
        const nameNode = mockNode('identifier', 'Point');
        const structDecl = mockNode('struct_declaration', 'public struct Point {}', undefined, [
          modifier,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'Point', 'csharp')).toBe(true);
      });

      it('enum with public modifier is exported', () => {
        const modifier = mockNode('modifier', 'public');
        const nameNode = mockNode('identifier', 'Status');
        const enumDecl = mockNode('enum_declaration', 'public enum Status {}', undefined, [
          modifier,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'Status', 'csharp')).toBe(true);
      });

      it('record with public modifier is exported', () => {
        const modifier = mockNode('modifier', 'public');
        const nameNode = mockNode('identifier', 'UserDto');
        const recordDecl = mockNode('record_declaration', 'public record UserDto {}', undefined, [
          modifier,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'UserDto', 'csharp')).toBe(true);
      });

      it('interface with public modifier is exported', () => {
        const modifier = mockNode('modifier', 'public');
        const nameNode = mockNode('identifier', 'IService');
        const ifaceDecl = mockNode(
          'interface_declaration',
          'public interface IService {}',
          undefined,
          [modifier, nameNode],
        );
        expect(isNodeExported(nameNode, 'IService', 'csharp')).toBe(true);
      });
    });

    // Rust additional cases
    describe('rust additional', () => {
      it('pub(crate) is exported', () => {
        const visMod = mockNode('visibility_modifier', 'pub(crate)');
        const nameNode = mockNode('identifier', 'internal_fn');
        const fnDecl = mockNode('function_item', 'pub(crate) fn internal_fn() {}', undefined, [
          visMod,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'internal_fn', 'rust')).toBe(true);
      });

      it('pub struct is exported', () => {
        const visMod = mockNode('visibility_modifier', 'pub');
        const nameNode = mockNode('type_identifier', 'Config');
        const structDecl = mockNode('struct_item', 'pub struct Config {}', undefined, [
          visMod,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'Config', 'rust')).toBe(true);
      });

      it('private struct is not exported', () => {
        const nameNode = mockNode('type_identifier', 'Inner');
        const structDecl = mockNode('struct_item', 'struct Inner {}', undefined, [nameNode]);
        expect(isNodeExported(nameNode, 'Inner', 'rust')).toBe(false);
      });

      it('pub enum is exported', () => {
        const visMod = mockNode('visibility_modifier', 'pub');
        const nameNode = mockNode('type_identifier', 'ErrorKind');
        const enumDecl = mockNode('enum_item', 'pub enum ErrorKind {}', undefined, [
          visMod,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'ErrorKind', 'rust')).toBe(true);
      });

      it('pub trait is exported', () => {
        const visMod = mockNode('visibility_modifier', 'pub');
        const nameNode = mockNode('type_identifier', 'Handler');
        const traitDecl = mockNode('trait_item', 'pub trait Handler {}', undefined, [
          visMod,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'Handler', 'rust')).toBe(true);
      });
    });

    // C/C++ additional cases
    describe('c/cpp additional', () => {
      it('static C++ function is not exported', () => {
        const nameNode = mockNode('identifier', 'localHelper');
        const staticSpec = mockNode('storage_class_specifier', 'static');
        const fnDef = mockNode('function_definition', 'static int localHelper() {}', undefined, [
          staticSpec,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'localHelper', 'cpp')).toBe(false);
      });

      it('declaration (not definition) without static is exported', () => {
        const nameNode = mockNode('identifier', 'compute');
        const decl = mockNode('declaration', 'int compute(int x);', undefined, [nameNode]);
        expect(isNodeExported(nameNode, 'compute', 'c')).toBe(true);
      });

      it('static declaration is not exported', () => {
        const nameNode = mockNode('identifier', 'internalFn');
        const staticSpec = mockNode('storage_class_specifier', 'static');
        const decl = mockNode('declaration', 'static int internalFn(void);', undefined, [
          staticSpec,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'internalFn', 'c')).toBe(false);
      });

      it('detached node defaults to exported (external linkage)', () => {
        const nameNode = mockNode('identifier', 'orphan');
        expect(isNodeExported(nameNode, 'orphan', 'c')).toBe(true);
      });

      it('C++ anonymous namespace function is not exported (internal linkage)', () => {
        const nameNode = mockNode('identifier', 'anonHelper');
        const fnDef = mockNode('function_definition', 'void anonHelper() {}', undefined, [
          nameNode,
        ]);
        // Anonymous namespace: namespace_definition with no name field
        const anonNs = mockNode(
          'namespace_definition',
          'namespace { void anonHelper() {} }',
          undefined,
          [fnDef],
        );
        expect(isNodeExported(nameNode, 'anonHelper', 'cpp')).toBe(false);
      });

      it('C++ named namespace function is still exported', () => {
        const nameNode = mockNode('identifier', 'namedHelper');
        const fnDef = mockNode('function_definition', 'void namedHelper() {}', undefined, [
          nameNode,
        ]);
        const nsName = mockNode('namespace_identifier', 'utils');
        const namedNs = mockNode(
          'namespace_definition',
          'namespace utils { void namedHelper() {} }',
          undefined,
          [fnDef],
          { name: nsName },
        );
        expect(isNodeExported(nameNode, 'namedHelper', 'cpp')).toBe(true);
      });
    });

    // C/C++ with real tree-sitter (validates structural storage_class_specifier detection)
    describe('c/cpp real tree-sitter', () => {
      it('non-static function is exported using real AST', async () => {
        const parser = await loadParser();
        await loadLanguage(SupportedLanguages.C);
        const tree = parser.parse('int add(int a, int b) { return a + b; }');
        const funcDef = tree.rootNode.child(0)!;
        // Find the identifier name node inside the function_definition
        const declNode = funcDef.childForFieldName('declarator');
        const nameNode = declNode?.childForFieldName?.('declarator') || declNode;
        expect(isNodeExported(nameNode, 'add', 'c')).toBe(true);
      });

      it('static function is not exported using real AST', async () => {
        const parser = await loadParser();
        await loadLanguage(SupportedLanguages.C);
        const tree = parser.parse('static int internal_helper(void) { return 0; }');
        const funcDef = tree.rootNode.child(0)!;
        const declNode = funcDef.childForFieldName('declarator');
        const nameNode = declNode?.childForFieldName?.('declarator') || declNode;
        expect(isNodeExported(nameNode, 'internal_helper', 'c')).toBe(false);
      });

      it('extern function is exported using real AST', async () => {
        const parser = await loadParser();
        await loadLanguage(SupportedLanguages.C);
        const tree = parser.parse('extern int shared_func(void);');
        const decl = tree.rootNode.child(0)!;
        // Declaration nodes should not have storage_class_specifier 'static'
        const nameNode = decl.descendantsOfType?.('identifier')?.[0] || decl;
        expect(isNodeExported(nameNode, 'shared_func', 'c')).toBe(true);
      });

      it('C++ anonymous namespace detected via real AST', async () => {
        const parser = await loadParser();
        await loadLanguage(SupportedLanguages.CPlusPlus);
        const code = 'namespace { void hidden() {} }';
        const tree = parser.parse(code);
        const nsDef = tree.rootNode.child(0)!;
        // Find function_definition inside the namespace body
        const body = nsDef.childForFieldName('body');
        const funcDef = body?.namedChild(0);
        const declNode = funcDef?.childForFieldName?.('declarator');
        const nameNode = declNode?.childForFieldName?.('declarator') || declNode;
        expect(isNodeExported(nameNode, 'hidden', 'cpp')).toBe(false);
      });

      it('C++ named namespace is still exported via real AST', async () => {
        const parser = await loadParser();
        await loadLanguage(SupportedLanguages.CPlusPlus);
        const code = 'namespace utils { void helper() {} }';
        const tree = parser.parse(code);
        const nsDef = tree.rootNode.child(0)!;
        const body = nsDef.childForFieldName('body');
        const funcDef = body?.namedChild(0);
        const declNode = funcDef?.childForFieldName?.('declarator');
        const nameNode = declNode?.childForFieldName?.('declarator') || declNode;
        expect(isNodeExported(nameNode, 'helper', 'cpp')).toBe(true);
      });
    });

    // C/C++ edge cases with mocks
    describe('c/cpp edge cases', () => {
      it('nested anonymous namespace (double nesting) is not exported', () => {
        const nameNode = mockNode('identifier', 'deepHidden');
        const fnDef = mockNode('function_definition', 'void deepHidden() {}', undefined, [
          nameNode,
        ]);
        const innerNs = mockNode('namespace_definition', 'namespace { }', undefined, [fnDef]);
        const outerNs = mockNode(
          'namespace_definition',
          'namespace outer { }',
          undefined,
          [innerNs],
          { name: mockNode('namespace_identifier', 'outer') },
        );
        expect(isNodeExported(nameNode, 'deepHidden', 'cpp')).toBe(false);
      });

      it('static function inside named namespace is not exported', () => {
        const nameNode = mockNode('identifier', 'staticInNs');
        const staticSpec = mockNode('storage_class_specifier', 'static');
        const fnDef = mockNode('function_definition', 'static void staticInNs() {}', undefined, [
          staticSpec,
          nameNode,
        ]);
        const ns = mockNode('namespace_definition', 'namespace foo { }', undefined, [fnDef], {
          name: mockNode('namespace_identifier', 'foo'),
        });
        expect(isNodeExported(nameNode, 'staticInNs', 'cpp')).toBe(false);
      });

      it('extern storage class is not confused with static', () => {
        const nameNode = mockNode('identifier', 'externFn');
        const externSpec = mockNode('storage_class_specifier', 'extern');
        const fnDef = mockNode('function_definition', 'extern void externFn() {}', undefined, [
          externSpec,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'externFn', 'c')).toBe(true);
      });
    });

    // Rust additional edge cases
    describe('rust edge cases', () => {
      it('pub(super) is treated as exported', () => {
        const visMod = mockNode('visibility_modifier', 'pub(super)');
        const nameNode = mockNode('identifier', 'parent_fn');
        const fnDecl = mockNode('function_item', 'pub(super) fn parent_fn() {}', undefined, [
          visMod,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'parent_fn', 'rust')).toBe(true);
      });

      it('pub union is exported', () => {
        const visMod = mockNode('visibility_modifier', 'pub');
        const nameNode = mockNode('type_identifier', 'MyUnion');
        const unionDecl = mockNode('union_item', 'pub union MyUnion {}', undefined, [
          visMod,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'MyUnion', 'rust')).toBe(true);
      });

      it('private union is not exported', () => {
        const nameNode = mockNode('type_identifier', 'InternalUnion');
        const unionDecl = mockNode('union_item', 'union InternalUnion {}', undefined, [nameNode]);
        expect(isNodeExported(nameNode, 'InternalUnion', 'rust')).toBe(false);
      });

      it('pub type alias is exported', () => {
        const visMod = mockNode('visibility_modifier', 'pub');
        const nameNode = mockNode('type_identifier', 'Result');
        const typeDecl = mockNode('type_item', 'pub type Result = ...', undefined, [
          visMod,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'Result', 'rust')).toBe(true);
      });

      it('pub const is exported', () => {
        const visMod = mockNode('visibility_modifier', 'pub');
        const nameNode = mockNode('identifier', 'MAX_SIZE');
        const constDecl = mockNode('const_item', 'pub const MAX_SIZE: usize = 100;', undefined, [
          visMod,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'MAX_SIZE', 'rust')).toBe(true);
      });

      it('private const is not exported', () => {
        const nameNode = mockNode('identifier', 'INTERNAL_LIMIT');
        const constDecl = mockNode('const_item', 'const INTERNAL_LIMIT: usize = 50;', undefined, [
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'INTERNAL_LIMIT', 'rust')).toBe(false);
      });

      it('pub static is exported', () => {
        const visMod = mockNode('visibility_modifier', 'pub');
        const nameNode = mockNode('identifier', 'INSTANCE');
        const staticDecl = mockNode('static_item', 'pub static INSTANCE: ...', undefined, [
          visMod,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'INSTANCE', 'rust')).toBe(true);
      });

      it('associated_type without pub is not exported', () => {
        const nameNode = mockNode('type_identifier', 'Item');
        const assocType = mockNode('associated_type', 'type Item;', undefined, [nameNode]);
        expect(isNodeExported(nameNode, 'Item', 'rust')).toBe(false);
      });
    });

    // C# edge cases
    describe('csharp edge cases', () => {
      it('protected modifier is not exported', () => {
        const modifier = mockNode('modifier', 'protected');
        const nameNode = mockNode('identifier', 'OnInit');
        const methodDecl = mockNode('method_declaration', 'protected void OnInit() {}', undefined, [
          modifier,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'OnInit', 'csharp')).toBe(false);
      });

      it('protected internal is not exported (first modifier wins)', () => {
        const mod1 = mockNode('modifier', 'protected');
        const mod2 = mockNode('modifier', 'internal');
        const nameNode = mockNode('identifier', 'Setup');
        const methodDecl = mockNode(
          'method_declaration',
          'protected internal void Setup() {}',
          undefined,
          [mod1, mod2, nameNode],
        );
        // Neither modifier is 'public', so not exported
        expect(isNodeExported(nameNode, 'Setup', 'csharp')).toBe(false);
      });

      it('record_struct with public modifier is exported', () => {
        const modifier = mockNode('modifier', 'public');
        const nameNode = mockNode('identifier', 'Coord');
        // tree-sitter-c-sharp emits `record_declaration` for `record`, `record
        // struct`, and `record class` alike (verified via real parse, #1920) —
        // there is no separate `record_struct_declaration` node type, so the
        // export check sees a `record_declaration`.
        const recStruct = mockNode(
          'record_declaration',
          'public record struct Coord {}',
          undefined,
          [modifier, nameNode],
        );
        expect(isNodeExported(nameNode, 'Coord', 'csharp')).toBe(true);
      });

      it('record_class with public modifier is exported', () => {
        const modifier = mockNode('modifier', 'public');
        const nameNode = mockNode('identifier', 'UserRecord');
        // `record class` also parses to `record_declaration` (see note above);
        // there is no `record_class_declaration` node in tree-sitter-c-sharp.
        const recClass = mockNode(
          'record_declaration',
          'public record class UserRecord {}',
          undefined,
          [modifier, nameNode],
        );
        expect(isNodeExported(nameNode, 'UserRecord', 'csharp')).toBe(true);
      });

      it('file_scoped_namespace_declaration is a valid context', () => {
        const modifier = mockNode('modifier', 'public');
        const nameNode = mockNode('identifier', 'MyClass');
        const classDecl = mockNode('class_declaration', 'public class MyClass {}', undefined, [
          modifier,
          nameNode,
        ]);
        // class_declaration is found before namespace, so public is detected
        expect(isNodeExported(nameNode, 'MyClass', 'csharp')).toBe(true);
      });

      it('delegate with public modifier is exported', () => {
        const modifier = mockNode('modifier', 'public');
        const nameNode = mockNode('identifier', 'OnChange');
        const delegateDecl = mockNode(
          'delegate_declaration',
          'public delegate void OnChange();',
          undefined,
          [modifier, nameNode],
        );
        expect(isNodeExported(nameNode, 'OnChange', 'csharp')).toBe(true);
      });

      it('event with public modifier is exported', () => {
        const modifier = mockNode('modifier', 'public');
        const nameNode = mockNode('identifier', 'Changed');
        const eventDecl = mockNode(
          'event_declaration',
          'public event EventHandler Changed;',
          undefined,
          [modifier, nameNode],
        );
        expect(isNodeExported(nameNode, 'Changed', 'csharp')).toBe(true);
      });

      it('property with public modifier is exported', () => {
        const modifier = mockNode('modifier', 'public');
        const nameNode = mockNode('identifier', 'Name');
        const propDecl = mockNode(
          'property_declaration',
          'public string Name { get; set; }',
          undefined,
          [modifier, nameNode],
        );
        expect(isNodeExported(nameNode, 'Name', 'csharp')).toBe(true);
      });
    });

    // Kotlin edge cases
    describe('kotlin edge cases', () => {
      it('protected function is not exported', () => {
        const visMod = mockNode('visibility_modifier', 'protected');
        const modifiers = mockNode('modifiers', 'protected', undefined, [visMod]);
        const nameNode = mockNode('identifier', 'onInit');
        const fnDecl = mockNode('function_declaration', 'protected fun onInit() {}', undefined, [
          modifiers,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'onInit', 'kotlin')).toBe(false);
      });
    });

    // Java edge cases
    describe('java edge cases', () => {
      it('protected method is not exported', () => {
        const modifiers = mockNode('modifiers', 'protected');
        const nameNode = mockNode('identifier', 'onInit');
        const methodDecl = mockNode('method_declaration', 'protected void onInit() {}', undefined, [
          modifiers,
          nameNode,
        ]);
        expect(isNodeExported(nameNode, 'onInit', 'java')).toBe(false);
      });

      it('static public method is exported', () => {
        const modifiers = mockNode('modifiers', 'public static');
        const nameNode = mockNode('identifier', 'main');
        const methodDecl = mockNode(
          'method_declaration',
          'public static void main(String[] args) {}',
          undefined,
          [modifiers, nameNode],
        );
        expect(isNodeExported(nameNode, 'main', 'java')).toBe(true);
      });
    });

    // PHP edge cases
    describe('php edge cases', () => {
      it('protected method is not exported', () => {
        const visMod = mockNode('visibility_modifier', 'protected');
        const nameNode = mockNode('name', 'init', visMod);
        expect(isNodeExported(nameNode, 'init', 'php')).toBe(false);
      });

      it('interface declaration is exported', () => {
        const ifaceDecl = mockNode('interface_declaration', 'interface Loggable {}');
        const nameNode = mockNode('name', 'Loggable', ifaceDecl);
        expect(isNodeExported(nameNode, 'Loggable', 'php')).toBe(true);
      });

      it('trait declaration is exported', () => {
        const traitDecl = mockNode('trait_declaration', 'trait Cacheable {}');
        const nameNode = mockNode('name', 'Cacheable', traitDecl);
        expect(isNodeExported(nameNode, 'Cacheable', 'php')).toBe(true);
      });

      it('enum declaration is exported', () => {
        const enumDecl = mockNode('enum_declaration', 'enum Status {}');
        const nameNode = mockNode('name', 'Status', enumDecl);
        expect(isNodeExported(nameNode, 'Status', 'php')).toBe(true);
      });
    });

    // Swift edge cases
    describe('swift edge cases', () => {
      it('internal function is exported (Swift internal = module-scoped visibility)', () => {
        const visMod = mockNode('visibility_modifier', 'internal');
        const nameNode = mockNode('identifier', 'setup', visMod);
        expect(isNodeExported(nameNode, 'setup', 'swift')).toBe(true);
      });

      it('private function is not exported', () => {
        const visMod = mockNode('visibility_modifier', 'private');
        const nameNode = mockNode('identifier', 'helper', visMod);
        expect(isNodeExported(nameNode, 'helper', 'swift')).toBe(false);
      });

      it('fileprivate function is not exported', () => {
        const visMod = mockNode('visibility_modifier', 'fileprivate');
        const nameNode = mockNode('identifier', 'localHelper', visMod);
        expect(isNodeExported(nameNode, 'localHelper', 'swift')).toBe(false);
      });
    });

    // Unknown language
    describe('unknown language', () => {
      it('returns false for unknown language', () => {
        const node = mockNode('identifier', 'foo');
        expect(isNodeExported(node, 'foo', 'unknown')).toBe(false);
      });
    });
  });

  // ─── Fixture files exist ─────────────────────────────────────────────

  describe('fixture files', () => {
    const fixtures = [
      'simple.ts',
      'simple.py',
      'simple.go',
      'simple.swift',
      'simple.php',
      'simple.rs',
      'simple.java',
      'simple.c',
      'simple.cpp',
      'simple.cs',
      'simple.zig',
    ];

    for (const fixture of fixtures) {
      it(`${fixture} exists and is non-empty`, async () => {
        const content = await fs.readFile(path.join(FIXTURES_DIR, fixture), 'utf-8');
        expect(content.length).toBeGreaterThan(0);
      });
    }
  });

  // ─── Unhappy path ─────────────────────────────────────────────────────

  describe('unhappy path', () => {
    it('returns empty AST or handles empty file content', async () => {
      const parser = await loadParser();
      await loadLanguage(SupportedLanguages.TypeScript, 'empty.ts');

      // Parsing a zero-length string must not throw and must return a valid tree.
      const tree = parser.parse('');
      expect(tree).toBeDefined();
      expect(tree.rootNode).toBeDefined();

      // An empty file produces a root node with no named children — no symbols.
      // isNodeExported on a bare node with no ancestors returns false regardless of language.
      const detachedNode = mockNode('identifier', 'foo');
      expect(isNodeExported(detachedNode, 'foo', 'typescript')).toBe(false);
    });

    it('handles binary/non-UTF8 content gracefully', async () => {
      const parser = await loadParser();
      await loadLanguage(SupportedLanguages.TypeScript, 'binary.ts');

      // Construct a string that contains the Unicode replacement character (U+FFFD)
      // and a mix of high-byte sequences that are not valid UTF-8 when treated as Latin-1.
      // JavaScript strings are UTF-16 internally, so this is always a valid string —
      // but it exercises tree-sitter's ability to handle unusual byte patterns.
      const binaryLikeContent = '\uFFFD\u0000\u0001\u001F' + '\xFF\xFE'.repeat(10) + '\uFFFD';

      // Must not throw — tree-sitter should return an error-recovery tree.
      let tree: any;
      expect(() => {
        tree = parser.parse(binaryLikeContent);
      }).not.toThrow();

      expect(tree).toBeDefined();
      expect(tree.rootNode).toBeDefined();
    });

    it('falls back gracefully for unsupported language', async () => {
      // getLanguageFromFilename returns null for extensions with no grammar mapping.
      const scalaLang = getLanguageFromFilename('Main.scala');
      expect(scalaLang).toBeNull();

      const luaLang = getLanguageFromFilename('module.lua');
      expect(luaLang).toBeNull();

      // loadLanguage throws an explicit error for a language not in the grammar map.
      // Cast through unknown to simulate a caller passing an unrecognised language key.
      await expect(loadLanguage('erlang' as unknown as SupportedLanguages)).rejects.toThrow(
        'Unsupported language',
      );
    });
  });
});