📝 Changelog

🤖 Smart Features

• 🔍 Smart API Key Detection: Automatically detects AI provider (OpenAI, Anthropic, Gemini, DeepSeek) from API key format
• ⚡ Auto-Configuration: Automatically switches provider and fills in default endpoint and model when key is detected
• ✅ Inline Feedback: Real-time visual confirmation when API key is recognized with provider and model information
• 🌍 Full i18n Support: All detection feedback messages localized in 10 languages

🎨 UI/UX Improvements

• 💚 Visual Feedback: Green gradient notification box shows detected provider and configured model
• ⚠️ Warning Messages: Yellow notification when API key format is not recognized
• ⏱️ Auto-Hide: Notifications automatically disappear after 8 seconds (success) or 5 seconds (warning)
• 🔒 Respects User Settings: When detected provider matches current selection, preserves user's custom configuration

🌐 Internationalization

• 🗣️ 10 Languages: Detection feedback in English, Chinese (Simplified & Traditional), Japanese, Korean, German, Spanish, French, Dutch, Ukrainian
• 📝 Localized Error Messages: All error messages now properly translated instead of English defaults

🎨 New Features

• 🌓 Automatic Dark Mode: Extension now automatically follows system color scheme preference
• ⚡ Real-time Theme Switching: Instantly updates when system theme changes
• 🎯 Zero Configuration: No manual setup needed - works out of the box
• ✨ Consistent Theming: Unified dark mode experience across all UI elements

🎨 UI/UX Improvements

• 🎨 CSS Variables System: Implemented comprehensive theming with CSS variables
• 🌈 Color Scheme Alignment: Matched dark mode colors with AI Text Polisher for consistency
• 🟢 Button Color Refinement: Save and test buttons now use green color for better UX
• 🔽 Select Dropdown Support: AI provider dropdown fully supports dark mode
• 📝 Improved Readability: Enhanced text contrast in both light and dark modes
• 🎭 Smooth Transitions: Elegant animations when switching between themes
• ✨ Inline Success Feedback: Replaced intrusive alert dialogs with inline button feedback

🔧 Technical Details

• Added prefers-color-scheme media query detection
• Implemented CSS custom properties for theming
• Added real-time theme change listeners
• Semi-transparent backgrounds for better visual depth
• Removed manual dark mode toggle for simpler UX

🚀 Major Features

• 🎯 Full Multi-Provider Support: Native support for multiple AI providers with their dedicated API formats
• ✅ Anthropic Claude: Native integration with Anthropic API (claude-3-5-sonnet-20241022)
• ✅ Google Gemini: Native integration with Google Gemini API (gemini-2.5-flash)
• ✅ OpenAI: Official OpenAI API support (gpt-4o-mini)
• ✅ Azure OpenAI: Microsoft Azure-hosted OpenAI support
• ✅ DeepSeek: DeepSeek AI with OpenAI-compatible format
• ✅ Custom Endpoints: Support for any OpenAI-compatible API (including Ollama local models)

🔧 Technical Improvements

• 🏗️ Provider Adapter Architecture: Extensible adapter pattern makes adding new providers easy
• 💾 Provider Persistence: Selected provider is now saved and restored across sessions
• 🔍 Smart Provider Detection: Automatically detects provider from endpoint URL for backward compatibility
• 📝 Provider-Specific Request Formats: Each provider uses its native API format for optimal compatibility
• 🎨 Provider-Specific Response Parsing: Correctly handles different response structures from each provider

📢 User Experience

• 🔔 Smart Update Notifications: Users are notified of major updates with changelog link
• 🌐 Internationalized Notifications: Update messages support multiple languages
• 📖 Automatic Changelog: Major version updates automatically open changelog page

🔮 Future-Ready

• 📦 Easy Provider Addition: Adding new AI providers requires only 3 simple steps
• 🛠️ Extensible Design: Architecture supports future providers like Cohere, Mistral, Perplexity, etc.

🛡️ Improvements

• 🔒 Error Handling: Implemented comprehensive API error handling to prevent runtime crashes and provide user-friendly error messages
• ✅ HTTP Status Checks: Added proper validation of API response status codes (4xx, 5xx errors)
• 🛟 Safe Property Access: Protected against undefined/null values in API responses

📝 Error Messages

• Clear messages for API quota exceeded
• Specific feedback for invalid API keys
• Rate limit notifications
• Content filter warnings
• Invalid response format alerts

🔧 Technical Details

• Added try-catch blocks for robust error handling
• Implemented safe optional chaining for API response parsing
• Enhanced console logging for debugging
• Graceful fallback for all error scenarios

🐛 Bug Fixes

• 🖥️ Fullscreen Mode: Fixed subtitle positioning during fullscreen transitions - subtitles restore to previous position when exiting fullscreen and auto-center when entering fullscreen, preventing subtitle disappearance or misalignment

🔧 Technical Improvements

• Added fullscreenchange event listener to handle fullscreen mode transitions
• Implemented position state management using dataset attributes
• Enhanced subtitle positioning logic for better cross-mode compatibility

🐛 Bug Fixes

• 🔤 Character Encoding: Fixed Chinese character encoding issue in popup by adding UTF-8 charset meta tag
• 📱 Responsive Design: Added viewport meta tag for better mobile display

✨ UI Improvements

• 🎨 Simplified Links: Removed urgent-looking disclaimer link, keeping only friendly website link

🐛 Bug Fixes

• 📏 Description Length: Fixed English extension description to meet Chrome Web Store's 132 character limit (was 133 characters)

🔧 Configuration Changes

• 🌐 Default Locale: Changed default locale from Chinese (zh_CN) to English (en) for broader international audience
• 📱 User Experience: Extension will now default to English UI for users without a matching locale

🌍 New Features

• 🗣️ Multilingual Support: Added localization for 8 additional languages
• 🇹🇼 Traditional Chinese (zh_TW): Full UI translation for Traditional Chinese users
• 🇯🇵 Japanese (ja): Complete Japanese interface localization
• 🇰🇷 Korean (ko): Korean language support throughout the extension
• 🇳🇱 Dutch (nl): Dutch language interface
• 🇫🇷 French (fr): French localization for all UI elements
• 🇩🇪 German (de): German language support
• 🇪🇸 Spanish (es): Spanish interface translation
• 🇺🇦 Ukrainian (uk): Ukrainian language support

🔧 Technical Improvements

• Added _locales/zh_TW/messages.json for Traditional Chinese
• Added _locales/ja/messages.json for Japanese
• Added _locales/ko/messages.json for Korean
• Added _locales/nl/messages.json for Dutch
• Added _locales/fr/messages.json for French
• Added _locales/de/messages.json for German
• Added _locales/es/messages.json for Spanish
• Added _locales/uk/messages.json for Ukrainian
• Extension now supports 10 languages total (including existing English and Simplified Chinese)

✨ New Features

• 🎯 Smart Debouncing: Intelligent subtitle translation with three-tier strategy to eliminate flickering on word-by-word subtitles
• 📝 Sentence Detection: Automatic detection of sentence-ending punctuation for immediate translation
• ⏱️ Adaptive Timing: 500ms debounce delay with 2000ms maximum wait time for optimal responsiveness

🐛 Bug Fixes

• 🔧 Flickering Issue: Fixed translation flickering on news videos with word-by-word subtitles
• 🗑️ Code Cleanup: Removed broken debounce implementation (lines 121-134)
• 💾 State Management: Improved subtitle tracking and timer cleanup

⚡ Performance

• 📉 Reduced API Calls: 70-90% reduction in translation requests on word-by-word subtitles
• 💰 Cost Savings: Significantly lower API usage and costs
• 🎨 Better Quality: AI receives more complete context for improved translations

📝 Documentation Updates

• 📄 Extension Description: Updated extension description to reflect support for multiple AI providers (OpenAI, Gemini, Claude, etc.) instead of just OpenAI
• 🌐 Localization: Updated both English and Chinese descriptions to accurately represent current capabilities

✨ New Features

• 🧪 API Endpoint Testing: Test connection button to verify API endpoint configuration before saving
• 🎯 AI Provider Quick Selection: Dropdown menu with presets for OpenAI, Azure OpenAI, Anthropic (Claude), Google Gemini, and DeepSeek
• 🤖 Provider-Specific Models: Auto-fill appropriate model names based on selected provider
• 🔍 Smart Provider Detection: Automatically detect and display current provider based on stored endpoint URL

🔧 Technical Improvements

• Added real-time connection testing with detailed error messages
• Improved API key handling for testing (supports both new input and stored keys)
• Added provider-specific endpoint and model presets
• Enhanced UX with visual feedback during testing

✨ New Features

• 🌍 Internationalization (i18n) Support: Extension UI now supports both Chinese and English, automatically switching based on browser language
• 🔧 Custom API Endpoints: Support for any OpenAI-compatible API endpoint (Azure OpenAI, local LLMs, etc.)
• ⚙️ Model Configuration: Customize the AI model name for translation
• 📱 Advanced Settings: New collapsible advanced settings section in popup

🔧 Technical Improvements

• Added _locales/zh_CN/messages.json and _locales/en/messages.json for i18n
• Updated manifest.json to use i18n placeholders
• Enhanced error handling for custom endpoints
• Improved popup UI with better styling and organization
• Premium popup design with gradients, shadows, and smooth animations
• Enhanced advanced settings toggle with visual cues and arrow indicator

✨ Features

• Display bilingual subtitles on YouTube videos (original + translation)
• High-quality translation using OpenAI API
• API key stored locally for privacy protection
• Customizable target translation language
• Draggable subtitle positioning
• Clean and beautiful user interface

🔧 Technical Implementation

• Manifest V3 architecture
• Service Worker background script
• Content Script injection on YouTube pages
• Chrome Sync Storage for settings

⚠️ Known Issues

• When subtitles are dragged too low in fullscreen mode, they may not display correctly after exiting fullscreen
• Workaround: Drag subtitles to an appropriate position in fullscreen mode, then switch back to default view

🎉 First Release

• Implemented YouTube bilingual subtitle display functionality
• Integrated OpenAI API translation service
• Local storage of API keys and settings
• Support for multiple target languages
• Published to Chrome Web Store and Edge Add-ons