# Agent Instructions for rsplayer

## Overview
Rust CLI music player daemon for GNU/Linux with shell autocompletion, SQLite library database, Unix socket IPC, and Last.fm/ListenBrainz scrobbling.

## Required Verification Commands
Run these before completing any task:
- Lint: `cargo clippy -- -D warnings`
- Format check: `cargo fmt --check`
- Test: `cargo test`
- Build: `cargo build`

## Development Workflow
- Use `rsp restart` or `rsplayer restart` to kill any running daemon and start a new one (useful during development)
- Daemon runs in background; restart command handles cleanup automatically
- After making changes to audio/playback/daemon code, always restart the daemon to test changes

## Code Conventions
- Use `directories` crate to resolve XDG paths (respect `XDG_CONFIG_HOME` and `XDG_RUNTIME_DIR` environment variables)
- Follow standard Rust style (enforced by `cargo fmt`)
- Never commit changes unless explicitly requested by the user
- Update shell completions when adding/modifying CLI subcommands
- Use `rand` crate for shuffle/randomization features (added in v0.9)

## Task-Specific Guidelines
- **CLI changes**: Update clap subcommands (including `rsp scan` and `rsp settings`) and regenerate shell completion scripts
- **Database changes**: Update SQLite schema and `rsp scan` logic
- **Playback changes**: Modify daemon audio engine or queue management code
  - Audio engine uses cpal for output and symphonia for decoding
  - Queue system implemented in daemon.rs with `Queue` struct
  - Sample buffering implemented to prevent buffer underruns - uses device default sample rate, not file's sample rate
  - Pause/resume uses cpal stream `pause()`/`play()` methods
- **Scrobbling changes**: Update Last.fm/ListenBrainz client implementation
- **Config/Settings changes**: Update config schema, `rsp settings` subcommands, and scan interval/auto-scan logic

## Completed Features (Phase 2)
- [x] Unix socket daemon IPC
- [x] Audio engine with play/pause/stop/volume
- [x] Queue system with in-memory tracking and auto-advance
- [x] Shuffle mode: `none`, `all`, and `album` (structure ready) implemented
- [x] Next/previous track commands with queue navigation
- [x] Resume CLI subcommand
- [x] Directory playback - queues all audio files in folder recursively
- [x] Fixed audio buffer underrun issues by using device default sample rate
- [x] Queue display with pager support (`rsplayer queue`)
- [x] Auto-play next track when current track ends
- [x] Metadata extraction and display (INDEX. ARTIST - TITLE format, falls back to filename)

## Remaining Work
- Album shuffle mode (`ShuffleMode::Album`)
- Database integration for queue persistence
- `rsplayer queue` command for queue management
- Scrobbling (Last.fm/ListenBrainz)
- Database scanning and schema
- Shell completion scripts
- Systemd service unit