zesdex/src/ipc/protocol.rs

//! Wire message types exchanged between an attached client and the
//! daemon over the `Connection`/framing layer (`conn.rs`, `frame.rs`).
//!
//! Flow: client input events are captured as `KeyAction`/`ClientRequest`
//! and sent to the daemon → the daemon applies them to its `AppStateRest`
//! and replies with `DaemonFrame` variants (a flattened `StatePayload`
//! for redraw, streamed tokens, system notes, or a close signal).
//!
//! Why: `StatePayload`/`MessageEntry`/`ToastEntry` are deliberately flat,
//! serializable projections of daemon-side state so the client can
//! redraw its TUI without sharing any in-process state with the daemon.

use serde::{Deserialize, Serialize};

/// Wire-serializable subset of `crossterm::event::KeyCode`, sent from
/// an attached client to the daemon over IPC.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum KeyAction {
    Char(char),
    Enter,
    Escape,
    Backspace,
    Delete,
    Tab,
    Up,
    Down,
    Left,
    Right,
    Home,
    End,
    PageUp,
    PageDown,
    Function(u8),
}

/// Messages an attached client sends to the daemon: input events, a
/// full-line submit, terminal resize, and connection lifecycle.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ClientRequest {
    Tick,
    KeyPress {
        key: KeyAction,
        ctrl: bool,
        alt: bool,
        shift: bool,
    },
    Submit(String),
    Resize(u16, u16),
    Close,
    ScrollUp,
    ScrollDown,
}

/// Flattened chat message sent from daemon to client for transcript display.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MessageEntry {
    pub role: String,
    pub content: String,
    pub timestamp: i64,
}

/// Flattened toast notification sent from daemon to client for rendering.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ToastEntry {
    pub kind: String,
    pub message: String,
    pub created_at: i64,
    pub lifetime_ms: u64,
}

/// Snapshot of daemon-side `AppStateRest` sent to the client after every
/// action, enough for the client to redraw its TUI without shared state.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StatePayload {
    pub session_id: String,
    pub messages: Vec<MessageEntry>,
    pub edit_count: u32,
    pub message_count: usize,
    pub overlay: Option<String>,
    pub toasts: Vec<ToastEntry>,
    pub dirty: bool,
    pub input_buffer: String,
    pub input_cursor: usize,
}

/// Messages the daemon sends back to an attached client.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum DaemonFrame {
    StateUpdate(Box<StatePayload>),
    StreamToken(String),
    SystemNote { kind: String, message: String },
    Closed,
}