# Architecture And Flow Diagrams

This document captures the current project architecture and major runtime flows
in Mermaid format. The diagrams reflect the implementation in the repository,
not older planning notes.

## Layered Architecture

```mermaid
flowchart TB
    Main["main/app_main"]
    App["app_composition\nstartup sequencing and wiring"]
    CP["control_plane\npolicy, lifecycle, workers, retry/backoff"]
    Domain["domain\nbusiness contracts, adapters, semantic mapping"]
    Platform["platform\nhardware, transport, storage, display, audio"]
    HW["ESP32-S3 hardware\nLCD, audio codec, GPIO, Wi-Fi, flash"]

    Main --> App
    App --> CP
    CP --> Domain
    Domain --> Platform
    Platform --> HW
```

## Component Responsibility Map

```mermaid
flowchart LR
    subgraph AppComposition["app_composition"]
        Boot["Plan A boot sequence"]
        Wire["Runtime wiring"]
    end

    subgraph ControlPlane["control_plane"]
        Connectivity["Connectivity bootstrap and Wi-Fi policy"]
        Workers["Runtime worker ownership"]
        Events["System event dispatch"]
        MultimodalPolicy["Multimodal session policy"]
        Fortune["Daily fortune policy"]
        RemoteLog["Remote log service"]
        FactoryCli["Factory CLI diagnostics"]
    end

    subgraph Domain["domain"]
        ExpressionMap["LCD expression semantic mapping"]
        RuntimeAdapters["Runtime facade adapters"]
        Direction["Direction and calibration model"]
        FortuneDomain["Birth profile and fortune contracts"]
        UserConfig["LAN user config routes"]
    end

    subgraph Platform["platform"]
        LCD["ST7789 direct LCD backend"]
        Audio["ES8311 audio pipeline"]
        Network["Wi-Fi, BLE provisioning, HTTP, WebSocket"]
        Storage["NVS, LittleFS, LogFS"]
        GPIO["GPIO, stepper, console UART"]
    end

    Boot --> Connectivity
    Boot --> Workers
    Wire --> Workers
    Connectivity --> RuntimeAdapters
    Workers --> Events
    Workers --> RemoteLog
    MultimodalPolicy --> RuntimeAdapters
    Fortune --> FortuneDomain
    Events --> ExpressionMap
    FactoryCli --> RemoteLog
    RuntimeAdapters --> LCD
    RuntimeAdapters --> Audio
    RuntimeAdapters --> Network
    RuntimeAdapters --> Storage
    RuntimeAdapters --> GPIO
```

## Current Boot Sequence

```mermaid
sequenceDiagram
    participant Main as app_main
    participant App as app_composition
    participant CP as control_plane
    participant Domain as domain
    participant Platform as platform

    Main->>App: app_composition_start_default_runtime()
    App->>CP: control_plane_prepare_runtime_storage()
    CP->>Domain: prepare storage through runtime adapters
    Domain->>Platform: NVS / storage initialization

    App->>CP: control_plane_play_boot_sound(timeout)
    CP->>Domain: domain_runtime_multimodal_audio_init()
    Domain->>Platform: ES8311 / I2S / I2C audio init
    CP->>Domain: domain_runtime_behavior_play_prompt_file()
    Domain->>Platform: play prompt file

    App->>CP: control_plane_init_lcd_device()
    CP->>Domain: domain_runtime_init_lcd_device()
    Domain->>Platform: LCD GPIO/SPI/ST7789 init

    App->>CP: control_plane_start_lcd_render_worker()
    CP->>CP: create cp_lcd_render task
    CP->>Domain: domain_runtime_start_lcd_render_loop()
    Domain->>Platform: lcd_direct_start_render_loop()

    App->>CP: control_plane_init()
    CP->>Domain: platform/domain runtime initialization
    Domain->>Platform: stepper, storage, behavior adapters

    App->>CP: control_plane_request_boot_expression()
    CP->>Domain: request DOMAIN_EXPRESSION_IDLE
    Domain->>Platform: queue LCD idle asset sequence

    opt boot turntable calibration enabled
        App->>CP: control_plane_calibrate()
        CP->>Domain: direction calibration policy
        Domain->>Platform: stepper + calibration switch
    end

    App->>CP: control_plane_bootstrap_connectivity()
    CP->>Domain: Wi-Fi init / STA connect / BLE provisioning fallback
    Domain->>Platform: Wi-Fi and provisioning primitives

    App->>CP: control_plane_start_runtime_workers()
    CP->>CP: start model, websocket wait, LCD, Wi-Fi state, events, keys, remote log, fortune
```

## Runtime Worker Topology

```mermaid
flowchart TB
    Start["control_plane_start_runtime_workers()"]

    Start --> ModelQueue["ensure model command queue"]
    Start --> ModelTask["cp_model_cmd"]
    Start --> WsWait["WebSocket wait task"]
    Start --> LcdTask["cp_lcd_render"]
    Start --> WifiTask["cp_wifi_state"]
    Start --> EventTask["cp_system_event"]
    Start --> KeyTask["cp_key_input"]
    Start --> RemoteLogTask["cp_remote_log"]
    Start --> FortuneTask["cp_fortune\nif FORTUNE_ENABLE"]

    KeyTask --> EventTask
    EventTask --> LcdTask
    WsWait --> Multimodal["multimodal client/runtime"]
    Multimodal --> ModelTask
    Multimodal --> Audio["audio capture/playback"]
    WifiTask --> LcdTask
    RemoteLogTask --> LogServer["remote log server"]
    FortuneTask --> FortuneApi["daily fortune API"]
```

## Connectivity Bootstrap Flow

```mermaid
flowchart TD
    Start["control_plane_bootstrap_connectivity"]
    InitWiFi["domain_runtime_network_wifi_init(seed credentials)"]
    HasCreds{"saved Wi-Fi credentials?"}
    StaConnect["connect STA with feedback"]
    StaOk{"STA connected?"}
    KeepCreds{"error keeps credentials?"}
    ClearCreds["clear saved Wi-Fi credentials"]
    ResolvePop["resolve provisioning PoP\nserial number preferred"]
    HasPop{"PoP available?"}
    BleProv["start BLE provisioning"]
    Done["return ESP_OK"]
    Error["return error"]

    Start --> InitWiFi --> HasCreds
    HasCreds -- yes --> StaConnect --> StaOk
    StaOk -- yes --> Done
    StaOk -- no --> KeepCreds
    KeepCreds -- yes --> Done
    KeepCreds -- no --> ClearCreds --> ResolvePop
    HasCreds -- no --> ResolvePop
    ResolvePop --> HasPop
    HasPop -- yes --> BleProv --> Done
    HasPop -- no --> Error
```

## LCD Expression Flow

```mermaid
flowchart LR
    CP["control_plane policy/event"]
    DomainReq["domain_runtime_request_expression()"]
    Resolve["domain_resolve_expression_platform_request()"]
    Catalog["domain expression catalog\nIDLE, WIFI_DISCONNECTED,\nSERVER_ERROR, MUYU, CHOUQIAN, WUXING"]
    PlatformReq["platform_lcd_request_presentation()"]
    Pending["lcd_direct pending request"]
    Render["cp_lcd_render loop"]
    Draw["draw RLE asset frame\nfrom /littlefs/lcd"]
    Panel["ST7789 panel"]

    CP --> DomainReq --> Resolve --> Catalog --> PlatformReq --> Pending --> Render --> Draw --> Panel

    Draw --> Delay["vTaskDelay(frame_ms)"]
    Delay --> Render
```

## Key And Local Event Flow

```mermaid
flowchart TD
    GPIO["GPIO edge interrupt\nPTT GPIO15 / SW2 GPIO45"]
    IsrQueue["key IRQ queue"]
    KeyTask["cp_key_input\ndebounce and click state machine"]
    SystemQueue["system event queue"]
    EventTask["cp_system_event"]
    PttState["PTT active state"]
    Chouqian["SW2 short press\nDOMAIN_EXPRESSION_CHOUQIAN"]
    Wuxing["SW2 double click\nDOMAIN_EXPRESSION_WUXING"]
    Muyu["PTT double click\nDOMAIN_EXPRESSION_MUYU"]

    GPIO --> IsrQueue --> KeyTask --> SystemQueue --> EventTask
    EventTask --> PttState
    EventTask --> Chouqian
    EventTask --> Wuxing
    EventTask --> Muyu
```

## Multimodal Runtime Flow

```mermaid
sequenceDiagram
    participant CP as control_plane
    participant Domain as domain
    participant Platform as platform
    participant WS as WebSocket server
    participant Audio as ES8311 audio path
    participant LCD as LCD expression

    CP->>Domain: prepare multimodal start
    CP->>Domain: register event callback
    CP->>Domain: register downstream audio callback
    CP->>CP: start multimodal watchdog task
    CP->>Domain: control_plane_multimodal_start()
    Domain->>Platform: open WebSocket transport
    Platform->>WS: connect and send Start directive

    WS-->>Platform: connected / task events
    Platform-->>Domain: multimodal events
    Domain-->>CP: event callback

    WS-->>Platform: downstream audio binary
    Platform-->>Domain: downstream audio callback
    Domain-->>CP: control_plane_downstream_audio_bridge()
    CP->>Audio: play downstream audio

    alt transport/task/output error while STA connected
        CP->>LCD: request DOMAIN_EXPRESSION_SERVER_ERROR
    end

    alt server responding starts
        CP->>Audio: stop uplink if running
    end
```

## Remote Logging Flow

```mermaid
flowchart TD
    EspLog["ESP_LOGx / printf log"]
    Hook["esp_log_set_vprintf hook"]
    Filter["filter by CONFIG_TQ_REMOTE_LOG_MIN_LEVEL"]
    RamQueue["RAM queue\nCONFIG_TQ_REMOTE_LOG_QUEUE_LEN"]
    FlushTimer["periodic flush\nCONFIG_TQ_REMOTE_LOG_FLUSH_INTERVAL_MS"]
    LogFS["/logfs/remote_logs\nLittleFS persistent queue"]
    StaReady{"STA connected\nand realtime path idle?"}
    Upload["HTTP POST JSON batch\nCONFIG_TQ_REMOTE_LOG_ENDPOINT"]
    Server["remote_log_receiver.py\n/opt/logTools/logs"]
    Backoff["exponential retry backoff"]
    DropOld["trim old files\nCONFIG_TQ_REMOTE_LOG_MAX_FILES"]
    CoreDump["detect flash coredump\nupload metadata report"]

    EspLog --> Hook --> Filter --> RamQueue
    RamQueue --> FlushTimer --> LogFS --> DropOld
    LogFS --> StaReady
    CoreDump --> StaReady
    StaReady -- yes --> Upload --> Server
    StaReady -- no --> Backoff --> StaReady
    Upload -- fail --> Backoff
    Upload -- success --> Delete["delete uploaded local file"]
```

## Daily Fortune Flow

```mermaid
flowchart TD
    Task["cp_fortune task"]
    WaitTime["wait for local time / next midnight / refresh request"]
    WaitNetwork["wait for STA and multimodal readiness"]
    Date["resolve local date"]
    Fetch["control_plane_refresh_daily_fortune(date)"]
    DomainFortune["domain fortune APIs\nbirth profile + fortune result"]
    Http["HTTPS fortune API"]
    Persist["persist fortune result"]
    Notify["notify observers / UI configuration server"]
    Retry["retry delay on failure"]

    Task --> WaitTime --> WaitNetwork --> Date --> Fetch
    Fetch --> DomainFortune --> Http
    Http -- success --> Persist --> Notify --> WaitTime
    Http -- failure --> Retry --> WaitTime
```

## Factory CLI Diagnostics Flow

```mermaid
flowchart LR
    UART["UART0 serial input"]
    CLI["factory CLI parser"]
    Identity["identity / auth commands"]
    LogStatus["log status"]
    LogFlush["log flush"]
    LogClear["log clear"]
    RemoteLog["control_plane_remote_log_*"]
    UARTOut["UART0 JSON/OK/ERROR output"]

    UART --> CLI
    CLI --> Identity --> UARTOut
    CLI --> LogStatus --> RemoteLog --> UARTOut
    CLI --> LogFlush --> RemoteLog --> UARTOut
    CLI --> LogClear --> RemoteLog --> UARTOut
```