# Calendar Bot AI Assistant - Full Documentation

## Bot Identity
Name: @Calendar0bot
Platform: Telegram
Type: AI-powered calendar management assistant
URL: https://t.me/calendar0bot
Website: https://calendar-tg.app

## Core Functionality

### Event Creation Methods
1. Natural Language Text
   - "Встреча завтра в 15:00"
   - "Meeting tomorrow at 3 PM"
   - "Dentist appointment next Friday at 2"

2. Voice Messages
   - Supports speech-to-text in multiple languages
   - Extracts dates, times, and event details
   - Works with casual speech patterns

3. Image Processing
   - Screenshots of events/tickets
   - OCR text extraction
   - Event poster/flyer parsing
   - Calendar screenshot imports

4. Document Import
   - .ics file support
   - Calendar file parsing
   - Bulk event import

### Calendar Integrations
- Google Calendar (free tier)
- Apple Calendar/iCloud (premium)
- Yandex Alice via CalDAV (premium)

### Language Support
English, Russian, German, French, Spanish, Portuguese, Turkish, Hindi, Indonesian, Malay, Vietnamese

## AI Assistant Capabilities

### Natural Language Processing
- Date/time extraction from casual language
- Context-aware event parsing
- Timezone handling
- Recurring event patterns

### Advanced Planning Features
- Shift schedules (работа через день, сутки через трое)
- Training plans and routines
- Availability analysis
- Smart scheduling suggestions

### Multimodal Understanding
- Image text recognition (OCR)
- Voice command processing (Whisper)
- Document structure parsing
- Chat history analysis


### Telegram Features
- Inline queries (@calendar0bot share events)
- Group calendar management
- Mini app interface
- Bot commands and callbacks

## User Features

### Free Tier
- Basic event creation
- Google Calendar sync
- Daily briefings
- Voice/text input
- Image processing

### Premium Features
- Apple Calendar sync
- Group calendars
- Extended AI assistant usage
- Task management
- Advanced planning tools

### Daily Operations
- Morning briefings
- Event reminders
- Schedule summaries
- Conflict detection

## Privacy and Security
- End-to-end encryption in transit
- No third-party data sharing
- Apple sync requires app-specific passwords with 2FA
- CalDAV access via user-generated tokens
- Data minimization practices

## Use Cases

### Individual Users
- Personal event management
- Voice-based quick scheduling
- Photo-to-calendar conversion
- Natural language reminders

### Families
- Shared family calendars
- Collaborative event planning
- Group scheduling in chats

### Teams
- Work schedule coordination
- Meeting planning in group chats
- Shift management
- Resource booking

### Public Events
- Event sharing via inline queries
- Public calendar subscriptions
- Community scheduling

## Technical Implementation

### Backend Architecture
- Node.js server
- Telegram Bot API integration
- Calendar API connections
- AI/ML processing pipeline

### Data Processing
- Speech-to-text (Whisper integration)
- OCR for image text extraction
- Natural language understanding
- Timezone conversion
- Recurring pattern detection

### Output Formats
- Telegram messages
- Calendar events (various formats)
- JSON API responses
- Structured data for AI consumption

## Developer Integration

### Bot Commands
- /start - Initialize bot
- /upcoming - Show upcoming events
- /feedback - Send feedback to developers
- /settings - Configure bot preferences
- /donate - Support the project
- /downloads - Get calendar files

### Inline Usage
Type "@calendar0bot" in any chat to share events

### API Endpoints
Designed for AI function calling with standardized JSON responses

## Performance Characteristics
- Real-time voice processing
- Multi-language OCR
- Concurrent calendar sync
- Low-latency response times
- Scalable for group usage

## Error Handling
- Graceful degradation for unsupported formats
- Clear error messages in user language
- Fallback to manual input when AI parsing fails
- Robust calendar sync error recovery