/// Shared application state for all request handlers.
use engram_core::EngramDb;
use engram_projection::registry::ProjectionRegistry;
use engram_sync::SyncEngine;
use engram_tx::TransactionEngine;
use std::sync::{Arc, Mutex};

pub struct AppState {
    /// Local database — uses std::sync::Mutex (sync ops only, fast)
    pub db: Arc<Mutex<EngramDb>>,
    /// Sync engine — uses tokio::sync::Mutex so it can be held across .await
    pub sync_engine: Arc<tokio::sync::Mutex<SyncEngine>>,
    /// API key used to authenticate incoming sync requests
    pub api_key: String,
    /// Projection registry — named schema views over the activation surface
    pub projection_registry: Arc<Mutex<ProjectionRegistry>>,
    /// Transaction engine — append-only command log with rollback support
    pub tx_engine: Arc<Mutex<TransactionEngine>>,
}