# Data Flow

## Repository Query Flow (Cache-First)

```mermaid
sequenceDiagram
    participant UI as Svelte Component
    participant Client as RepositoryClient (TS)
    participant Rust as Tauri Command
    participant Hybrid as HybridRepository
    participant Cache as OfflineRepository (SQLite)
    participant Server as OnlineRepository (HTTP)

    UI->>Client: getItems(parentId)
    Client->>Rust: invoke("repository_get_items", {handle, parentId})
    Rust->>Hybrid: get_items()

    par Parallel Racing
        Hybrid->>Cache: get_items() with 100ms timeout
        Hybrid->>Server: get_items() (no timeout)
    end

    alt Cache returns with content
        Cache-->>Hybrid: Result with items
        Hybrid-->>Rust: Return cache result
    else Cache timeout or empty
        Server-->>Hybrid: Fresh result
        Hybrid-->>Rust: Return server result
    end

    Rust-->>Client: SearchResult
    Client-->>UI: items[]
    Note over UI: Reactive update
```

**Key Points:**
- Cache queries have 100ms timeout for responsiveness
- Server queries always run for fresh data
- Cache wins if it has meaningful content
- Automatic fallback to server if cache is empty/stale
- Background cache updates (planned)

## Playback Initiation Flow

```mermaid
sequenceDiagram
    participant User
    participant AudioPlayer
    participant Tauri as Tauri IPC
    participant Command as player_play_item()
    participant Controller as PlayerController
    participant Backend as PlayerBackend
    participant Store as Frontend Store

    User->>AudioPlayer: clicks play
    AudioPlayer->>Tauri: invoke("player_play_item", {item})
    Tauri->>Command: player_play_item()
    Command->>Command: Convert PlayItemRequest -> MediaItem
    Command->>Controller: play_item(item)
    Controller->>Backend: load(item)
    Note over Backend: State -> Loading
    Controller->>Backend: play()
    Note over Backend: State -> Playing
    Controller-->>Command: Ok(())
    Command-->>Tauri: PlayerStatus {state, position, duration, volume}
    Tauri-->>AudioPlayer: status
    AudioPlayer->>Store: player.setPlaying(media, position, duration)
    Note over Store: UI updates reactively
```

## Playback Mode Transfer Flow

```mermaid
sequenceDiagram
    participant UI as Cast Button
    participant Store as playbackMode store
    participant Rust as Tauri Command
    participant Manager as PlaybackModeManager
    participant Player as PlayerController
    participant Jellyfin as Jellyfin API

    UI->>Store: transferToRemote(sessionId)
    Store->>Rust: invoke("playback_mode_transfer_to_remote", {sessionId})
    Rust->>Manager: transfer_to_remote()

    Manager->>Player: Get current queue
    Player-->>Manager: Vec<MediaItem>
    Manager->>Manager: Extract Jellyfin IDs

    Manager->>Jellyfin: POST /Sessions/{id}/Playing<br/>{itemIds, startIndex}
    Jellyfin-->>Manager: 200 OK

    Manager->>Jellyfin: POST /Sessions/{id}/Playing/Seek<br/>{positionTicks}
    Jellyfin-->>Manager: 200 OK

    Manager->>Player: stop()
    Manager->>Manager: mode = Remote {sessionId}

    Manager-->>Rust: Ok(())
    Rust-->>Store: PlaybackMode
    Store->>UI: Update cast icon
```

## Queue Navigation Flow

```mermaid
flowchart TB
    User["User clicks Next"] --> Invoke["invoke('player_next')"]
    Invoke --> ControllerNext["controller.next()"]
    ControllerNext --> QueueNext["queue.next()<br/>- Check repeat mode<br/>- Check shuffle<br/>- Update history"]

    QueueNext --> None["None<br/>(at end)"]
    QueueNext --> Some["Some(next)"]
    QueueNext --> Same["Same<br/>(repeat one)"]

    Some --> PlayItem["play_item(next)<br/>Returns new status"]
```

## Volume Control Flow

```mermaid
sequenceDiagram
    participant User
    participant Slider as Volume Slider
    participant Handler as handleVolumeChange()
    participant Tauri as Tauri IPC
    participant Command as player_set_volume
    participant Controller as PlayerController
    participant Backend as MpvBackend/NullBackend
    participant Events as playerEvents.ts
    participant Store as Player Store
    participant UI

    User->>Slider: adjusts (0-100)
    Slider->>Handler: oninput event
    Handler->>Handler: Convert 0-100 -> 0.0-1.0
    Handler->>Tauri: invoke("player_set_volume", {volume})
    Tauri->>Command: player_set_volume
    Command->>Controller: set_volume(volume)
    Controller->>Backend: set_volume(volume)
    Backend->>Backend: Clamp to 0.0-1.0
    Note over Backend: MpvBackend: Send to MPV loop
    Backend-->>Tauri: emit "player-event"
    Tauri-->>Events: VolumeChanged event
    Events->>Store: player.setVolume(volume)
    Store-->>UI: Reactive update
    Note over UI: Both AudioPlayer and<br/>MiniPlayer stay in sync
```

**Key Implementation Details:**
- Volume is stored in the backend (NullBackend/MpvBackend)
- `PlayerController.volume()` delegates to backend
- `get_player_status()` returns `controller.volume()` (not hardcoded)
- Frontend uses normalized 0.0-1.0 scale, UI shows 0-100