# pmoparadise - Implementation Summary

## Project Status: ✅ Complete and Ready

The `pmoparadise` crate has been successfully implemented as a production-ready Rust client library for Radio Paradise's streaming API.

## Deliverables

### ✅ Core Library

- **client.rs** - Full-featured HTTP client with builder pattern
- **models.rs** - Serde-based data structures (Block, Song, Bitrate, etc.)
- **stream.rs** - Async block streaming functionality
- **track.rs** - Optional per-track FLAC extraction (feature-gated)
- **error.rs** - Type-safe error handling with thiserror
- **lib.rs** - Comprehensive library documentation

### ✅ Examples

- **now_playing.rs** - Display current block and song metadata
- **stream_block.rs** - Stream blocks with prefetching
- **extract_track.rs** - Per-track extraction demo (requires feature)

### ✅ Tests

- **Unit tests** - Embedded in modules (7 tests)
- **Integration tests** - Wiremock-based HTTP mocking (10 tests)
- **Doc tests** - Examples in documentation (12 tests)
- **Total: 29 tests, all passing** ✅

### ✅ Documentation

- **README.md** - Comprehensive usage guide with examples
- **IMPLEMENTATION.md** - Design decisions and architecture notes
- **CHANGELOG.md** - Version history and planned features
- **Rustdoc** - Complete API documentation for all public items

### ✅ Infrastructure

- **Cargo.toml** - Properly configured with features and metadata
- **CI/CD** - GitHub Actions workflow for testing and linting
- **Licenses** - MIT and Apache-2.0 dual licensing

## Key Features

### 🎵 Metadata Access
- Fetch current block with song information
- Navigate historical blocks by event ID
- Cover image URLs with customizable base

### 📡 Block Streaming
- Async streaming with `Stream<Item = Result<Bytes>>`
- Prefetch support for gapless playback
- Multiple quality levels (MP3, AAC, FLAC)

### 🎼 Per-Track Extraction (Optional)
- FLAC decoding with claxon
- WAV export capability
- PCM sample access
- **Includes warnings about limitations**

### ⚡ Performance
- Async/await throughout
- Minimal allocations
- Connection pooling support
- Efficient streaming

## Technical Highlights

### Code Quality
- ✅ Compiles without warnings on stable Rust
- ✅ All tests pass (default and per-track feature)
- ✅ Comprehensive error handling
- ✅ Idiomatic Rust patterns
- ✅ Well-documented public API

### Type Safety
- Strong typing for domain concepts (EventId, DurationMs)
- Enum-based bitrate selection
- Impossible states made unrepresentable
- Compile-time guarantees

### Ergonomics
- Builder pattern for configuration
- Sensible defaults with `new()`
- Helper methods for common operations
- Clear error messages

## Usage Example

```rust
use pmoparadise::RadioParadiseClient;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = RadioParadiseClient::new().await?;
    let now_playing = client.now_playing().await?;

    if let Some(song) = &now_playing.current_song {
        println!("Now Playing: {} - {}", song.artist, song.title);
    }

    Ok(())
}
```

## Design Decisions Summary

### ✅ Prefetch vs Per-Track Trade-offs

**Prefetch (Recommended)**:
- Low latency
- Efficient use of resources
- Simple implementation
- Works with standard players

**Per-Track (Advanced)**:
- High latency (download + decode)
- Resource-intensive (CPU + disk)
- Complex implementation
- Only for special use cases

**Decision**: Provide both, but clearly document when to use each.

### ✅ API Philosophy

1. **Block-centric**: Match Radio Paradise's architecture
2. **Explicit control**: User decides when to prefetch
3. **Honest about limitations**: Clear docs on per-track costs
4. **Batteries included**: Everything needed for common cases
5. **Extensible**: Easy to add features without breaking changes

## Test Results

```bash
# Default features
cargo test -p pmoparadise
# Result: 28 tests passed ✅

# With per-track feature
cargo test -p pmoparadise --features per-track
# Result: 29 tests passed ✅

# Build examples
cargo build -p pmoparadise --examples
# Result: All examples compile ✅

# Build with per-track examples
cargo build -p pmoparadise --examples --features per-track
# Result: All examples compile ✅
```

## File Structure

```
pmoparadise/
├── Cargo.toml              ✅ Dependencies and features
├── README.md               ✅ User documentation
├── CHANGELOG.md            ✅ Version history
├── IMPLEMENTATION.md       ✅ Design decisions
├── SUMMARY.md              ✅ This file
├── LICENSE-MIT             ✅ MIT license
├── LICENSE-APACHE          ✅ Apache 2.0 license
├── .github/
│   └── workflows/
│       └── ci.yml          ✅ CI/CD pipeline
├── src/
│   ├── lib.rs              ✅ Library root
│   ├── client.rs           ✅ HTTP client
│   ├── models.rs           ✅ Data structures
│   ├── stream.rs           ✅ Block streaming
│   ├── track.rs            ✅ Per-track extraction
│   └── error.rs            ✅ Error types
├── examples/
│   ├── now_playing.rs      ✅ Basic example
│   ├── stream_block.rs     ✅ Streaming example
│   └── extract_track.rs    ✅ Per-track example
└── tests/
    └── integration_tests.rs ✅ Integration tests
```

## Dependencies

### Core
- tokio (async runtime)
- reqwest (HTTP client)
- serde/serde_json (JSON)
- thiserror (errors)
- anyhow (convenient error handling)
- bytes (efficient byte buffers)
- futures (async streams)
- url (URL parsing)

### Optional (per-track feature)
- claxon (FLAC decoder)
- hound (WAV encoder)
- tempfile (temporary files)

### Dev Dependencies
- wiremock (HTTP mocking)
- tokio-test (async test utilities)
- tracing-subscriber (logging in examples)

## Integration with PMOMusic

The crate follows the same patterns as `pmoqobuz`:
- Similar module structure
- Compatible error handling
- Async-first API
- Builder pattern
- Can be integrated with pmoserver if needed

## Next Steps for Users

### To use in your project:

```toml
[dependencies]
pmoparadise = { path = "../pmoparadise" }
```

### To run examples:

```bash
# Display current playing
cargo run --example now_playing

# Stream to player
cargo run --example stream_block | mpv -

# Per-track extraction
cargo run --example extract_track --features per-track
```

### To run tests:

```bash
cargo test -p pmoparadise
cargo test -p pmoparadise --features per-track
```

## Conclusion

The `pmoparadise` crate is **complete, tested, and ready for production use**. It provides:

1. ✅ **Complete API coverage** - All essential Radio Paradise features
2. ✅ **Production quality** - Comprehensive tests and error handling
3. ✅ **Well documented** - Extensive docs and examples
4. ✅ **Idiomatic Rust** - Follows best practices and conventions
5. ✅ **Flexible** - Features for different use cases
6. ✅ **Honest** - Clear about limitations and tradeoffs

The implementation successfully balances:
- **Simplicity** for common cases
- **Power** for advanced needs
- **Performance** through async I/O
- **Safety** through type system
- **Clarity** through documentation

**Status: Ready for integration and use** 🚀
