// Bridge module - Client-server communication
// Implements D-020 subprocess/IPC architecture
// MessagePack serialization for Rust<->Godot communication

use bevy_app::prelude::*;
use bevy_ecs::prelude::*;

pub mod framing;
pub mod local;
pub mod types;
pub use types::*;

/// Error type for bridge operations
#[derive(Debug, thiserror::Error)]
pub enum BridgeError {
    #[error("serialization error: {0}")]
    Serialization(#[from] rmp_serde::encode::Error),
    #[error("deserialization error: {0}")]
    Deserialization(#[from] rmp_serde::decode::Error),
    #[error("io error: {0}")]
    Io(#[from] std::io::Error),
    #[error("transport error: {0}")]
    Transport(String),
}

/// Abstracts transport layer (D-020)
/// Implemented by LocalBridge (stdio) and future NetworkBridge
pub trait SimBridge: Send + Sync {
    /// Send an observer snapshot to the client
    fn send_snapshot(&self, snapshot: &ObserverSnapshot) -> Result<(), BridgeError>;

    /// Receive player inputs from the client
    fn receive_inputs(&self) -> Result<Vec<PlayerInput>, BridgeError>;
}

/// BridgeResource: Bevy Resource wrapper for SimBridge trait object
#[derive(Resource)]
pub struct BridgeResource {
    inner: Box<dyn SimBridge>,
}

impl BridgeResource {
    pub fn new(bridge: impl SimBridge + 'static) -> Self {
        Self {
            inner: Box::new(bridge),
        }
    }

    pub fn send_snapshot(&self, snapshot: &ObserverSnapshot) -> Result<(), BridgeError> {
        self.inner.send_snapshot(snapshot)
    }

    pub fn receive_inputs(&self) -> Result<Vec<PlayerInput>, BridgeError> {
        self.inner.receive_inputs()
    }
}

/// Bridge plugin for client-server communication
/// Abstracts transport layer (LocalBridge/NetworkBridge)
pub struct BridgePlugin;

impl Plugin for BridgePlugin {
    fn build(&self, _app: &mut App) {
        // Stub implementation - will be populated in phase 2
        tracing::debug!("BridgePlugin initialized");
    }
}