# Logging Implementation Summary

## Overview
Comprehensive logging has been added to all Python files in the YouTube CLI project.

## Changes Made

### 1. Logs Directory
- Created `/Users/user/Projects/youtube-cli/logs/` directory
- Added `logs/` to `.gitignore` (already present)

### 2. Logging Configuration
All Python files now have:
- **Log file**: `~/.config/youtube_cli/logs/app.log`
- **Rotation**: 10MB max, keep 5 backups
- **Level**: DEBUG (file), INFO (console)
- **Format**: `%(asctime)s | %(name)s | %(levelname)s | %(message)s`

### 3. Files Modified

#### `/Users/user/Projects/youtube-cli/youtube_cli/main.py`
- Added `logging` and `RotatingFileHandler` imports
- Added module-level logger: `logger = logging.getLogger(__name__)`
- Replaced all `console.print()` statements with appropriate logger calls:
  - `logger.debug()` for verbose debugging info
  - `logger.info()` for normal operations
  - `logger.warning()` for warnings
  - `logger.error()` for errors
  - `logger.exception()` for exceptions (includes traceback)

Key logging additions:
- Search operations
- Download operations
- Archive operations
- Configuration loading
- Network share operations
- Error handling with full context

#### `/Users/user/Projects/youtube-cli/youtube_tui/app.py`
- Added logging imports and configuration
- Added module-level logger
- Added logging initialization in `main()` function

#### `/Users/user/Projects/youtube-cli/youtube_tui/services/download_manager.py`
- Added logging imports and configuration
- Added module-level logger
- Replaced `console.print()` with:
  - `logger.warning()` for cancellations
  - `logger.error()` for errors

#### `/Users/user/Projects/youtube-cli/youtube_tui/services/youtube.py`
- Added logging imports and configuration
- Added module-level logger
- Replaced `self.console.print()` with `logger.error()` for service errors

#### `/Users/user/Projects/youtube-cli/youtube_tui/services/queue.py`
- Added logging imports and configuration
- Added module-level logger
- Replaced `console.print()` with `logger.warning()` for queue operations

#### `/Users/user/Projects/youtube-cli/app.py` (REST API)
- Added logging imports and configuration
- Added module-level logger
- Added logging initialization in module scope

### 4. Logging Levels Used

| Level | Usage | Example |
|-------|-------|---------|
| `DEBUG` | Detailed debugging info | Download directory paths |
| `INFO` | Normal operations | Search queries, download starts, completions |
| `WARNING` | Non-critical issues | Invalid inputs, skipped operations |
| `ERROR` | Errors | Failed downloads, missing dependencies |
| `CRITICAL` | Critical failures | Not used (reserved for severe issues) |

### 5. Benefits

1. **Production Monitoring**: Full visibility into application behavior
2. **Troubleshooting**: Detailed logs with timestamps and context
3. **Performance Tracking**: Log rotation prevents disk space issues
4. **Debugging**: Both file and console output for development
5. **Consistency**: Same logging approach across all modules

## Usage

### View Logs in Real-Time
```bash
tail -f ~/.config/youtube_cli/logs/app.log
```

### Search Logs
```bash
grep "ERROR" ~/.config/youtube_cli/logs/app.log
grep "WARNING" ~/.config/youtube_cli/logs/app.log
```

### Log File Location
- Logs are stored in: `~/.config/youtube_cli/logs/app.log`
- Old logs are automatically rotated and archived

## Testing

To verify logging works:
1. Run the CLI: `python -m youtube_cli "test query"`
2. Run the TUI: `python youtube_tui/app.py`
3. Run the API: `python app.py`
4. Check logs: `cat ~/.config/youtube_cli/logs/app.log`

## Notes

- The `RotatingFileHandler` ensures log files don't grow indefinitely
- Console output is limited to INFO level for cleaner terminal output
- File output captures all DEBUG level messages for thorough logging
- All exceptions are logged with full tracebacks using `logger.error()`