# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Project Overview

Video Library Manager (VLM) is a Python CLI tool for managing personal video collections with a safety-first, human-in-the-loop approach. All file operations are reversible, require explicit confirmation, and generate reviewable execution plans before making changes.

## Development Commands

### Installation
```bash
# Install package in editable mode
uv pip install -e .

# Install with dev dependencies (pytest, hypothesis)
uv pip install -e ".[dev]"
```

### Testing
```bash
# Run all tests
pytest

# Run specific test file
pytest tests/test_scanner.py

# Run with verbose output
pytest -v
```

### Running the CLI
```bash
# Verify CLI works
vlm --help

# Initialize config
vlm config init

# Common workflow
vlm scan                    # Discover files
vlm parse                   # Extract identities
vlm enrich                  # (Optional) Enrich titles/reputation via TMDB
vlm analyze                 # Detect gaps/duplicates
vlm plan                    # Generate execution plan
vlm execute                 # Dry-run (default)
vlm execute --confirm       # Actually execute
```

## Architecture

### Core Workflow
VLM follows a read-first, multi-stage pipeline:
1. **Scan** → discovers video files, extracts metadata via ffprobe (optional), saves to inventory.csv
2. **Parse** → extracts titles/years/seasons/episodes from filenames, saves to identities.json
3. **Enrich** (optional) → adds bilingual titles and reputation (TMDB); updates identities.json in place; uses SQLite cache for incremental runs
4. **Analyze** → detects episode gaps and duplicates, saves to analysis.json
5. **Plan** → generates reviewable execution plan (plan.json) with file operations
6. **Execute** → performs file operations (dry-run by default, --confirm to execute)
7. **Rollback** → reverses executed operations (best-effort)

### Module Organization
- `cli.py` - Click-based CLI interface, global options, command registration
- `context.py` - CLIContext (config, paths) and pass_context for commands
- `commands/` - Command implementations (scan, analyze, plan)
- `scanner.py` - File discovery using system `find` command, metadata extraction via ffprobe
- `parser.py` - Filename parsing using regex patterns (movies: title + year, series: SxxExx)
- `enrichment.py` - Enrichment pipeline; `cache.py` - SQLite cache; `providers/` - TMDB etc.
- `io.py` - Load/save identities JSON/CSV, plan/analysis input helpers
- `utils.py` - UTC time, format_size, shared helpers
- `analysis.py` - Completeness checking (episode gaps) and duplicate detection
- `duplicate_resolve.py` - Duplicate group resolution (by_quality, by_reputation, first_seen, manual)
- `planner.py` - Execution plan generation with conflict detection
- `executor.py` - File operations (move/rename/quarantine) with rollback logging
- `quarantine.py` - Quarantine management with manifest tracking
- `state.py` - File state tracking across workflow stages
- `reports.py` - Report generation (inventory, completeness, duplicates, summary)
- `config.py` - YAML configuration loading and validation
- `models.py` - Dataclass definitions for all data structures
- `logging_config.py` - Logging setup with fallback to console if file logging fails

### Key Data Structures
All defined in `models.py`:
- `VideoFile` - represents discovered video file with metadata
- `MovieIdentity` / `SeriesIdentity` - parsed identity with confidence score
- `ExecutionPlan` - collection of file operations with summary
- `FileOperation` - single operation (move/rename/quarantine/no-op) with conflict detection
- `RollbackLog` - log of executed operations for reversal
- `QuarantineEntry` - quarantined file with original location
- `FileState` - workflow state (reviewed/ignored/planned/executed/quarantined)

### File Categorization
Based on top-level directory within library root, matched against configured category mappings (case-insensitive).

Files in unmapped directories are categorized as "other" and skipped by planner/quarantine operations.

### Parsing Patterns (Hardcoded)
**Movies** (high confidence):
- `{title} ({year})`
- `{title}.{year}`

**Series** (high confidence):
- `S{season:02d}E{episode:02d}`
- `{season}x{episode}`

Patterns are hardcoded in parser.py, not user-configurable.

### Configuration
Default location: `~/.vlm/config.yaml`

Key settings:
- `library_root` - root directory to scan (required)
- `video_extensions` - list of extensions to recognize
- `templates.movie_dir` / `templates.series_dir` - directory structure templates
- `templates.movie_filename` / `templates.series_filename` - filename templates
- `quarantine_dir` - name of quarantine directory (default: `.quarantine`)
- `log_level` - logging verbosity
- `categories` - mapping of category names to directory name lists
- `enrichment` (or `enrich`) - TMDB/api_keys, cache_db, translation, reputation; see README for full schema
- `plan.duplicate_keep` - when using `vlm plan --analysis`: `by_quality` (resolution > source > codec > size), `by_reputation` (default), `first_seen`, or `manual`

### Category Mappings

Categories are determined by matching the top-level directory name against configured mappings:

**Default mappings:**
```yaml
categories:
  movie: [movie]
  series: [series]
  anime: [anime]
```

**Custom mappings** support multiple directory names per category:
```yaml
categories:
  movie: [movie, movies, films]
  series: [series, tv, shows, television]
  anime: [anime]
```

This allows files in `/library/movies/` or `/library/films/` to be recognized as the "movie" category. Directory matching is case-insensitive.

**Migration Note:** If you have existing directories with non-standard names (like "movies" or "tv"), update your config.yaml and re-run `vlm scan` to fix categorization. No files will be moved.

### File Discovery
Uses system `find` command for speed, falls back to Python recursion if unavailable. Hidden paths (starting with `.`) are skipped automatically.

### Timestamp Handling
All timestamps stored in UTC using ISO 8601 format (`YYYY-MM-DDTHH:MM:SS`). The scanner normalizes naive timestamps to UTC using system timezone.

### Logging
Logs to `~/.vlm/vlm.log` by default. If log directory is unwritable, falls back to console-only logging and continues execution (does not fail).

### Error Handling
- Configuration errors: display helpful message, create default config, continue
- Missing ffprobe: skip metadata extraction, log debug message, continue
- File access errors: log error, skip file, continue scanning
- Invalid YAML: display error, use default config

## Testing Guidelines

- Framework: pytest with hypothesis for property-based tests
- Test file naming: `test_*.py`
- Test function naming: `test_*`
- Test class naming: `Test*`
- Use `CliRunner` for CLI integration tests
- Prefer narrow unit tests for module logic plus targeted CLI integration tests
- Add tests with each behavior change, including error paths and edge cases

## Important Implementation Notes

### Safety Protocol
- NEVER permanently delete files - use quarantine instead
- All file operations create rollback logs when executed with --confirm
- Execution plans detect destination conflicts and mark operations
- Default mode is dry-run; --confirm required for actual execution
- Quarantine is reversible via restore command

### Anime Handling
Anime files are discovered and categorized but NOT parsed in v1 (deferred for future implementation).

### State Management
State tracking is optional and allows marking files as reviewed/ignored/planned/executed/quarantined. State is persisted to `~/.vlm/state.json`.

### Quarantine Constraints
Only movie and series files can be quarantined in v1 (anime and other categories rejected).

### Template Variables
Available for path/filename templates:
- Movies: `{title}`, `{year}`, `{ext}`
- Series: `{title}`, `{season}`, `{episode}`, `{ext}`

Format specifiers like `{season:02d}` are supported.

## Code Style

- Python 3.10+ idioms
- 4-space indentation
- PEP 8 naming: `snake_case` for functions/variables, `PascalCase` for classes, `UPPER_SNAKE_CASE` for constants
- Type hints for public functions and non-trivial internal APIs
- Modules focused on single responsibility
- No formatter/linter enforced - maintain consistency with existing files

## Commit Guidelines

- Clear, imperative commit subjects (e.g., "fix logging fallback for unwritable log dir")
- Keep commits focused - avoid mixing refactors and behavior changes
- Include co-author tag: `Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>`