/*
 * Copyright (c) Atmosphère-NX
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#pragma once
#include <mesosphere/kern_common.hpp>
#include <mesosphere/kern_k_synchronization_object.hpp>
#include <mesosphere/kern_k_server_session.hpp>
#include <mesosphere/kern_k_client_session.hpp>
#include <mesosphere/kern_slab_helpers.hpp>

namespace ams::kern {

    class KClientPort;
    class KProcess;

    class KSession final : public KAutoObjectWithSlabHeapAndContainer<KSession, KAutoObjectWithList, true> {
        MESOSPHERE_AUTOOBJECT_TRAITS(KSession, KAutoObject);
        private:
            enum class State : u8 {
                Invalid      = 0,
                Normal       = 1,
                ClientClosed = 2,
                ServerClosed = 3,
            };
        private:
            util::Atomic<std::underlying_type<State>::type> m_atomic_state;
            bool m_initialized;
            KServerSession m_server;
            KClientSession m_client;
            KClientPort *m_port;
            uintptr_t m_name;
            KProcess *m_process;
        private:
            ALWAYS_INLINE void SetState(State state) {
                m_atomic_state = static_cast<u8>(state);
            }

            ALWAYS_INLINE State GetState() const {
                return static_cast<State>(m_atomic_state.Load());
            }
        public:
            constexpr explicit KSession(util::ConstantInitializeTag)
                : KAutoObjectWithSlabHeapAndContainer<KSession, KAutoObjectWithList, true>(util::ConstantInitialize),
                  m_atomic_state(static_cast<std::underlying_type<State>::type>(State::Invalid)), m_initialized(),
                  m_server(util::ConstantInitialize), m_client(util::ConstantInitialize),  m_port(), m_name(), m_process()
            {
                /* ... */
            }

            explicit KSession() : m_atomic_state(util::ToUnderlying(State::Invalid)), m_initialized(false), m_process(nullptr) { /* ... */ }

            void Initialize(KClientPort *client_port, uintptr_t name);
            void Finalize();

            bool IsInitialized() const { return m_initialized; }
            uintptr_t GetPostDestroyArgument() const { return reinterpret_cast<uintptr_t>(m_process); }

            static void PostDestroy(uintptr_t arg);

            void OnServerClosed();
            void OnClientClosed();

            bool IsServerClosed() const { return this->GetState() != State::Normal; }
            bool IsClientClosed() const { return this->GetState() != State::Normal; }

            Result OnRequest(KSessionRequest *request) { R_RETURN(m_server.OnRequest(request)); }

            KClientSession &GetClientSession() { return m_client; }
            KServerSession &GetServerSession() { return m_server; }
            const KClientSession &GetClientSession() const { return m_client; }
            const KServerSession &GetServerSession() const { return m_server; }

            const KClientPort *GetParent() const { return m_port; }
    };

}