#include "Renderive_WebSocket_Controller.h"
#include "Asio_WebSocket_Scene_Loop.h"
#include "Web_Event_Adapter.h"
#include "Web_Plot_Session.h"
#include <renderive/error/Error_Policy.hpp>
#include <trantor/utils/Logger.h>
#include <chrono>
#include <memory>
#include <utility>
namespace renderive::web {
namespace {
using Scene_Loop = Asio_WebSocket_Scene_Loop<Web_Plot_Session>;
void send_response(const std::weak_ptr<drogon::WebSocketConnection>& weak_connection, Web_Response response) {
    const auto connection = weak_connection.lock();
    if (!connection || !connection->connected())
        return;
    const auto message_type = response.type == Web_Response_Type::Pixels ? drogon::WebSocketMessageType::Binary : drogon::WebSocketMessageType::Text;
    connection->send(response.payload.data(), response.payload.size(), message_type);
}
void fail_session(const std::weak_ptr<drogon::WebSocketConnection>& weak_connection, std::exception_ptr exception) {
    static_cast<void>(::renderive::error::capture("handling Renderive WebSocket scene loop", exception));
    LOG_ERROR << "Renderive WebSocket scene loop failed";
    if (const auto connection = weak_connection.lock(); connection && connection->connected())
        connection->shutdown(drogon::CloseCode::kUnexpectedCondition, "Renderive rendering failed");
}
}
Renderive_WebSocket_Controller::Renderive_WebSocket_Controller(std::shared_ptr<asio::thread_pool> scene_pool) : scene_pool_(std::move(scene_pool)) {}
void Renderive_WebSocket_Controller::handleNewConnection(const drogon::HttpRequestPtr&, const drogon::WebSocketConnectionPtr& connection) {
    const std::weak_ptr<drogon::WebSocketConnection> weak_connection = connection;
    connection->setContext(Scene_Loop::create(scene_pool_->get_executor(), [weak_connection](Web_Response response) {
        send_response(weak_connection, std::move(response));
    }, [weak_connection](std::exception_ptr exception) {
        fail_session(weak_connection, exception);
    }));
    connection->setPingMessage("renderive", std::chrono::seconds(20));
    LOG_INFO << "Renderive WebSocket connected: " << connection->peerAddr().toIpPort();
}
void Renderive_WebSocket_Controller::handleNewMessage(const drogon::WebSocketConnectionPtr& connection, std::string&& message, const drogon::WebSocketMessageType& type) {
    if (type == drogon::WebSocketMessageType::Ping || type == drogon::WebSocketMessageType::Pong || type == drogon::WebSocketMessageType::Close)
        return;
    if (type != drogon::WebSocketMessageType::Text) {
        connection->shutdown(drogon::CloseCode::kInvalidMessage, "Renderive accepts text events only");
        return;
    }
    if (message.size() > 16 * 1024) {
        connection->shutdown(drogon::CloseCode::kMessageTooBig, "Renderive event is too large");
        return;
    }
    const auto event = Web_Event_Adapter::decode(message);
    if (!event) {
        connection->shutdown(drogon::CloseCode::kWrongMessageContent, "Invalid Renderive event");
        return;
    }
    const auto session = connection->getContext<Scene_Loop>();
    if (!session) {
        connection->shutdown(drogon::CloseCode::kUnexpectedCondition, "Renderive session is unavailable");
        return;
    }
    if (session->submit(std::move(*event)) == Scene_Loop::Submit_Result::queue_full)
        connection->shutdown(drogon::CloseCode::kViolation, "Renderive scene queue is full");
}
void Renderive_WebSocket_Controller::handleConnectionClosed(const drogon::WebSocketConnectionPtr& connection) {
    LOG_INFO << "Renderive WebSocket closed: " << connection->peerAddr().toIpPort();
    if (const auto session = connection->getContext<Scene_Loop>())
        session->stop();
    connection->clearContext();
}
}