/**
 * Resolution Module Tests
 *
 * Tests for Phase 3: Reference Resolution
 */

import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import * as fs from 'fs';
import * as path from 'path';
import * as os from 'os';
import { CodeGraph } from '../src';
import { Node, UnresolvedReference } from '../src/types';
import { ReferenceResolver, createResolver, ResolutionContext } from '../src/resolution';
import { matchReference } from '../src/resolution/name-matcher';
import { resolveImportPath, extractImportMappings } from '../src/resolution/import-resolver';
import { detectFrameworks, getAllFrameworkResolvers } from '../src/resolution/frameworks';
import { QueryBuilder } from '../src/db/queries';
import { DatabaseConnection } from '../src/db';

describe('Resolution Module', () => {
  let tempDir: string;
  let cg: CodeGraph;

  beforeEach(() => {
    // Create temp directory
    tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'codegraph-resolution-test-'));
  });

  afterEach(() => {
    // Clean up
    if (cg) {
      cg.destroy();
    } else if (fs.existsSync(tempDir)) {
      fs.rmSync(tempDir, { recursive: true });
    }
  });

  describe('Name Matcher', () => {
    it('should match exact name references', () => {
      // Create a mock context
      const mockNodes: Node[] = [
        {
          id: 'func:test.ts:myFunction:10',
          kind: 'function',
          name: 'myFunction',
          qualifiedName: 'test.ts::myFunction',
          filePath: 'test.ts',
          language: 'typescript',
          startLine: 10,
          endLine: 20,
          startColumn: 0,
          endColumn: 0,
          updatedAt: Date.now(),
        },
      ];

      const context: ResolutionContext = {
        getNodesInFile: () => mockNodes,
        getNodesByName: (name) => mockNodes.filter((n) => n.name === name),
        getNodesByQualifiedName: () => [],
        getNodesByKind: () => [],
        fileExists: () => true,
        readFile: () => null,
        getProjectRoot: () => '/test',
        getAllFiles: () => ['test.ts'],
      };

      const ref = {
        fromNodeId: 'caller:main.ts:caller:5',
        referenceName: 'myFunction',
        referenceKind: 'calls' as const,
        line: 5,
        column: 10,
        filePath: 'main.ts',
        language: 'typescript' as const,
      };

      const result = matchReference(ref, context);

      expect(result).not.toBeNull();
      expect(result?.targetNodeId).toBe('func:test.ts:myFunction:10');
      expect(result?.resolvedBy).toBe('exact-match');
    });

    it('should match qualified name references', () => {
      const mockClassNode: Node = {
        id: 'class:user.ts:User:5',
        kind: 'class',
        name: 'User',
        qualifiedName: 'user.ts::User',
        filePath: 'user.ts',
        language: 'typescript',
        startLine: 5,
        endLine: 30,
        startColumn: 0,
        endColumn: 0,
        updatedAt: Date.now(),
      };

      const mockMethodNode: Node = {
        id: 'method:user.ts:User.save:15',
        kind: 'method',
        name: 'save',
        qualifiedName: 'user.ts::User::save',
        filePath: 'user.ts',
        language: 'typescript',
        startLine: 15,
        endLine: 25,
        startColumn: 0,
        endColumn: 0,
        updatedAt: Date.now(),
      };

      const context: ResolutionContext = {
        getNodesInFile: (fp) => fp === 'user.ts' ? [mockClassNode, mockMethodNode] : [],
        getNodesByName: (name) => {
          if (name === 'User') return [mockClassNode];
          if (name === 'save') return [mockMethodNode];
          return [];
        },
        getNodesByQualifiedName: (qn) => {
          if (qn === 'user.ts::User::save') return [mockMethodNode];
          return [];
        },
        getNodesByKind: () => [],
        fileExists: () => true,
        readFile: () => null,
        getProjectRoot: () => '/test',
        getAllFiles: () => ['user.ts'],
      };

      const ref = {
        fromNodeId: 'caller:main.ts:main:5',
        referenceName: 'User.save',
        referenceKind: 'calls' as const,
        line: 5,
        column: 10,
        filePath: 'main.ts',
        language: 'typescript' as const,
      };

      const result = matchReference(ref, context);

      expect(result).not.toBeNull();
      expect(result?.targetNodeId).toBe('method:user.ts:User.save:15');
    });
  });

  describe('Import Resolver', () => {
    it('should resolve relative import paths', () => {
      const context: ResolutionContext = {
        getNodesInFile: () => [],
        getNodesByName: () => [],
        getNodesByQualifiedName: () => [],
        getNodesByKind: () => [],
        fileExists: (p) => p === 'src/components/utils.ts' || p === 'src/components/utils/index.ts',
        readFile: () => null,
        getProjectRoot: () => '',
        getAllFiles: () => ['src/components/utils.ts', 'src/components/utils/index.ts'],
      };

      const result = resolveImportPath(
        './utils',
        'src/components/Button.ts',
        'typescript',
        context
      );

      expect(result).toBe('src/components/utils.ts');
    });

    it('should resolve parent directory imports', () => {
      const context: ResolutionContext = {
        getNodesInFile: () => [],
        getNodesByName: () => [],
        getNodesByQualifiedName: () => [],
        getNodesByKind: () => [],
        fileExists: (p) => p === 'src/helpers.ts' || p === 'src/helpers/index.ts',
        readFile: () => null,
        getProjectRoot: () => '',
        getAllFiles: () => ['src/helpers.ts', 'src/helpers/index.ts'],
      };

      const result = resolveImportPath(
        '../helpers',
        'src/components/Button.ts',
        'typescript',
        context
      );

      expect(result).toBe('src/helpers.ts');
    });

    it('should extract JS/TS import mappings', () => {
      const content = `
import { foo } from './foo';
import bar from '../bar';
import * as utils from './utils';
import { baz, qux } from './baz';
`;

      const mappings = extractImportMappings(
        'src/index.ts',
        content,
        'typescript'
      );

      expect(mappings.length).toBeGreaterThan(0);
      expect(mappings.some((m) => m.localName === 'foo')).toBe(true);
      expect(mappings.some((m) => m.localName === 'bar')).toBe(true);
    });

    it('should extract Python import mappings', () => {
      const content = `
from utils import helper
from .models import User
import os
from ..services import auth_service
`;

      const mappings = extractImportMappings(
        'src/main.py',
        content,
        'python'
      );

      expect(mappings.length).toBeGreaterThan(0);
      expect(mappings.some((m) => m.localName === 'helper')).toBe(true);
      expect(mappings.some((m) => m.localName === 'User')).toBe(true);
    });
  });

  describe('Framework Detection', () => {
    it('should detect React framework', () => {
      const context: ResolutionContext = {
        getNodesInFile: () => [],
        getNodesByName: () => [],
        getNodesByQualifiedName: () => [],
        getNodesByKind: () => [],
        fileExists: () => false,
        readFile: (p) => {
          if (p === 'package.json') {
            return JSON.stringify({
              dependencies: { react: '^18.0.0' },
            });
          }
          return null;
        },
        getProjectRoot: () => '/test',
        getAllFiles: () => ['package.json', 'src/App.tsx'],
      };

      const frameworks = detectFrameworks(context);
      expect(frameworks.some((f) => f.name === 'react')).toBe(true);
    });

    it('should detect Express framework', () => {
      const context: ResolutionContext = {
        getNodesInFile: () => [],
        getNodesByName: () => [],
        getNodesByQualifiedName: () => [],
        getNodesByKind: () => [],
        fileExists: () => false,
        readFile: (p) => {
          if (p === 'package.json') {
            return JSON.stringify({
              dependencies: { express: '^4.18.0' },
            });
          }
          return null;
        },
        getProjectRoot: () => '/test',
        getAllFiles: () => ['package.json', 'src/app.js'],
      };

      const frameworks = detectFrameworks(context);
      expect(frameworks.some((f) => f.name === 'express')).toBe(true);
    });

    it('should detect Laravel framework', () => {
      const context: ResolutionContext = {
        getNodesInFile: () => [],
        getNodesByName: () => [],
        getNodesByQualifiedName: () => [],
        getNodesByKind: () => [],
        fileExists: (p) => p === 'artisan',
        readFile: () => null,
        getProjectRoot: () => '/test',
        getAllFiles: () => ['artisan', 'app/Http/Kernel.php'],
      };

      const frameworks = detectFrameworks(context);
      expect(frameworks.some((f) => f.name === 'laravel')).toBe(true);
    });

    it('should return all framework resolvers', () => {
      const resolvers = getAllFrameworkResolvers();
      expect(resolvers.length).toBeGreaterThan(0);
      expect(resolvers.some((r) => r.name === 'react')).toBe(true);
      expect(resolvers.some((r) => r.name === 'express')).toBe(true);
      expect(resolvers.some((r) => r.name === 'laravel')).toBe(true);
    });
  });

  describe('React Framework Resolver', () => {
    it('should resolve React component references', () => {
      const mockNodes: Node[] = [
        {
          id: 'component:src/Button.tsx:Button:5',
          kind: 'component',
          name: 'Button',
          qualifiedName: 'src/Button.tsx::Button',
          filePath: 'src/Button.tsx',
          language: 'tsx',
          startLine: 5,
          endLine: 20,
          startColumn: 0,
          endColumn: 0,
          updatedAt: Date.now(),
        },
      ];

      const context: ResolutionContext = {
        getNodesInFile: (fp) => (fp === 'src/Button.tsx' ? mockNodes : []),
        getNodesByName: () => mockNodes,
        getNodesByQualifiedName: () => [],
        getNodesByKind: () => [],
        fileExists: () => false,
        readFile: (p) => {
          if (p === 'package.json') {
            return JSON.stringify({ dependencies: { react: '^18.0.0' } });
          }
          return null;
        },
        getProjectRoot: () => '/test',
        getAllFiles: () => ['package.json', 'src/Button.tsx', 'src/App.tsx'],
      };

      const frameworks = detectFrameworks(context);
      const reactResolver = frameworks.find((f) => f.name === 'react');
      expect(reactResolver).toBeDefined();

      const ref = {
        fromNodeId: 'component:src/App.tsx:App:1',
        referenceName: 'Button',
        referenceKind: 'renders' as const,
        line: 10,
        column: 5,
        filePath: 'src/App.tsx',
        language: 'typescript' as const,
      };

      const result = reactResolver!.resolve(ref, context);
      expect(result).not.toBeNull();
      expect(result?.targetNodeId).toBe('component:src/Button.tsx:Button:5');
    });

    it('should resolve custom hook references', () => {
      const mockNodes: Node[] = [
        {
          id: 'hook:src/hooks/useAuth.ts:useAuth:1',
          kind: 'function',
          name: 'useAuth',
          qualifiedName: 'src/hooks/useAuth.ts::useAuth',
          filePath: 'src/hooks/useAuth.ts',
          language: 'typescript',
          startLine: 1,
          endLine: 20,
          startColumn: 0,
          endColumn: 0,
          updatedAt: Date.now(),
        },
      ];

      const context: ResolutionContext = {
        getNodesInFile: (fp) => (fp.includes('useAuth') ? mockNodes : []),
        getNodesByName: () => mockNodes,
        getNodesByQualifiedName: () => [],
        getNodesByKind: () => [],
        fileExists: () => false,
        readFile: (p) => {
          if (p === 'package.json') {
            return JSON.stringify({ dependencies: { react: '^18.0.0' } });
          }
          return null;
        },
        getProjectRoot: () => '/test',
        getAllFiles: () => ['package.json', 'src/hooks/useAuth.ts'],
      };

      const frameworks = detectFrameworks(context);
      const reactResolver = frameworks.find((f) => f.name === 'react');

      const ref = {
        fromNodeId: 'component:src/App.tsx:App:1',
        referenceName: 'useAuth',
        referenceKind: 'calls' as const,
        line: 5,
        column: 10,
        filePath: 'src/App.tsx',
        language: 'typescript' as const,
      };

      const result = reactResolver!.resolve(ref, context);
      expect(result).not.toBeNull();
      expect(result?.targetNodeId).toBe('hook:src/hooks/useAuth.ts:useAuth:1');
    });
  });

  describe('Integration Tests', () => {
    it('should create resolver from CodeGraph instance', async () => {
      // Create a simple TypeScript project
      fs.writeFileSync(
        path.join(tempDir, 'package.json'),
        JSON.stringify({ name: 'test', dependencies: { react: '^18.0.0' } })
      );

      const srcDir = path.join(tempDir, 'src');
      fs.mkdirSync(srcDir);

      // Create utility file
      fs.writeFileSync(
        path.join(srcDir, 'utils.ts'),
        `export function formatDate(date: Date): string {
  return date.toISOString();
}

export function parseDate(str: string): Date {
  return new Date(str);
}`
      );

      // Create main file that uses utils
      fs.writeFileSync(
        path.join(srcDir, 'main.ts'),
        `import { formatDate, parseDate } from './utils';

function processDate(input: string): string {
  const date = parseDate(input);
  return formatDate(date);
}`
      );

      // Initialize and index
      cg = await CodeGraph.init(tempDir, { index: true });

      // Check that resolver detected React framework
      const frameworks = cg.getDetectedFrameworks();
      expect(frameworks).toContain('react');

      // Get stats to verify indexing worked
      const stats = cg.getStats();
      expect(stats.fileCount).toBe(2);
      expect(stats.nodeCount).toBeGreaterThan(0);
    });

    it('should resolve references after indexing', async () => {
      // Create a project with references
      const srcDir = path.join(tempDir, 'src');
      fs.mkdirSync(srcDir, { recursive: true });

      fs.writeFileSync(
        path.join(srcDir, 'helper.ts'),
        `export function helperFunction(): void {
  console.log('helper');
}`
      );

      fs.writeFileSync(
        path.join(srcDir, 'main.ts'),
        `import { helperFunction } from './helper';

function main(): void {
  helperFunction();
}`
      );

      cg = await CodeGraph.init(tempDir, { index: true });

      // Run reference resolution
      const result = cg.resolveReferences();

      // Should have attempted resolution
      expect(result.stats.total).toBeGreaterThanOrEqual(0);
    });
  });
});