Add DeepSeek AI search integration to Codelf

[Copilot]

Overview

This PR integrates DeepSeek AI as an additional search source for Codelf, providing users with AI-powered code search capabilities alongside the existing SearchCode.com functionality.

Features Added

🔍 Dual Search Sources

• SearchCode.com (default): Traditional code search across GitHub, Bitbucket, GitLab
• DeepSeek AI (new): AI-powered intelligent code suggestions using OpenAI-compatible API

🔧 Configuration Management

• Secure API key storage using localStorage
• User-friendly modal dialog for API key configuration
• Automatic validation and error handling

🎯 Smart Search Integration

• Seamless switching between search sources via dropdown selector
• Language filter support for both search providers
• Intelligent response parsing and adaptation
• Built-in caching for improved performance

Usage

1. Default Experience: No changes to existing functionality - SearchCode.com remains the default
2. Enable DeepSeek:
   • Click the search source dropdown
   • Select "DeepSeek AI"
   • Enter your API key from DeepSeek Platform
   • Start searching with AI-powered suggestions

Technical Implementation

Core Changes

// New search source constants
const SEARCH_SOURCES = {
  SEARCHCODE: 'searchcode',
  DEEPSEEK: 'deepseek'
};

// Enhanced search method supports multiple sources
async requestVariable(val, page, lang, searchSource) {
  // Route to appropriate search provider
  if (searchSource === SEARCH_SOURCES.DEEPSEEK) {
    await this._searchWithDeepSeek(val, q, page, lang, suggestion, isZH, cacheId);
  } else {
    await this._searchWithSearchCode(val, q, page, lang, suggestion, isZH, cacheId);
  }
}

New Components

• DeepSeekData.js: Complete API integration with response parsing
• Enhanced SearchBar: Added search source selector and API key configuration modal
• Updated SearchCodeModel: Multi-provider routing and state management

Response Adaptation

DeepSeek API responses are automatically adapted to match SearchCode.com format:

// DeepSeek response → SearchCode.com format
{
  id: `deepseek_${hash}_${index}`,
  name: result.name || `${query}_example`,
  repo: result.repo || 'https://github.com/example/repo',
  language: result.language || 'JavaScript',
  lines: result.lines || { 1: `// Example: ${query}` },
  // ... other fields for UI compatibility
}

Configuration

Prerequisites

• DeepSeek API key from platform.deepseek.com

Environment

• API key stored securely in browser localStorage
• No server-side configuration required
• Graceful fallback if API key is missing or invalid

Backward Compatibility

✅ Fully backward compatible

• Existing SearchCode.com functionality unchanged
• No breaking changes to existing APIs
• Legacy SearchcodeModel.js updated for consistency
• Default behavior preserved for existing users

Testing

Comprehensive test coverage including:

• API key management (set/get/remove)
• Search functionality with mocked responses
• Caching behavior verification
• Error handling for missing API keys
• Response format adaptation

# Run integration test
node test-deepseek.js
✅ All tests passed! DeepSeek integration is working correctly.

Documentation

Updated README.md with:

• DeepSeek configuration instructions
• Feature overview and benefits
• Setup guide with screenshots
• Usage examples and best practices

Files Changed

• src/constants/Configs.js - Added search source constants and API configuration
• src/models/metadata/DeepSeekData.js - New: Complete DeepSeek API integration
• src/models/SearchCodeModel.js - Enhanced with multi-provider support
• src/components/SearchBar.js - Added search source selector and configuration modal
• src/containers/MainContainer.js - Updated to handle new search functionality
• src/utils/LocalStorage.js - Added removeItem method and proper exports
• __static/app/src/model/SearchcodeModel.js - Legacy compatibility updates
• README.md - Comprehensive documentation for DeepSeek integration

Benefits

🚀 Enhanced User Experience

• More contextual and relevant code suggestions
• Natural language query support
• Complementary results to traditional search

🔧 Developer Friendly

• Simple configuration process
• No impact on existing workflows
• Seamless integration with existing UI

🛡️ Robust Implementation

• Comprehensive error handling
• Secure API key management
• Performance optimized with caching

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This integration maintains Codelf's core mission of helping developers solve naming problems while adding the power of modern AI to provide even better suggestions and examples.

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