/*
 * Copyright (c) 2018-2020 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 <stratosphere.hpp>
#include "htclow_mux_task_manager.hpp"
#include "htclow_mux_channel_impl_map.hpp"
#include "htclow_mux_global_send_buffer.hpp"

namespace ams::htclow::mux {

    enum class MuxState {
        Normal,
        Sleep,
    };

    class Mux {
        private:
        private:
            PacketFactory *m_packet_factory;
            ctrl::HtcctrlStateMachine *m_state_machine;
            TaskManager m_task_manager;
            os::Event m_event;
            ChannelImplMap m_channel_impl_map;
            GlobalSendBuffer m_global_send_buffer;
            os::SdkMutex m_mutex;
            MuxState m_state;
            s16 m_version;
        public:
            Mux(PacketFactory *pf, ctrl::HtcctrlStateMachine *sm);

            void SetVersion(u16 version);

            os::EventType *GetSendPacketEvent() { return m_event.GetBase(); }

            Result CheckReceivedHeader(const PacketHeader &header) const;
            Result ProcessReceivePacket(const PacketHeader &header, const void *body, size_t body_size);

            bool QuerySendPacket(PacketHeader *header, PacketBody *body, int *out_body_size);
            void RemovePacket(const PacketHeader &header);

            void UpdateChannelState();
            void UpdateMuxState();
        public:
            Result Open(impl::ChannelInternalType channel);
            Result Close(impl::ChannelInternalType channel);

            Result ConnectBegin(u32 *out_task_id, impl::ChannelInternalType channel);
            Result ConnectEnd(impl::ChannelInternalType channel, u32 task_id);

            ChannelState GetChannelState(impl::ChannelInternalType channel);
            os::EventType *GetChannelStateEvent(impl::ChannelInternalType channel);

            Result FlushBegin(u32 *out_task_id, impl::ChannelInternalType channel);
            Result FlushEnd(u32 task_id);

            os::EventType *GetTaskEvent(u32 task_id);

            Result ReceiveBegin(u32 *out_task_id, impl::ChannelInternalType channel, size_t size);
            Result ReceiveEnd(size_t *out, void *dst, size_t dst_size, impl::ChannelInternalType channel, u32 task_id);

            Result SendBegin(u32 *out_task_id, size_t *out, const void *src, size_t src_size, impl::ChannelInternalType channel);
            Result SendEnd(u32 task_id);

            Result WaitReceiveBegin(u32 *out_task_id, impl::ChannelInternalType channel, size_t size);
            Result WaitReceiveEnd(u32 task_id);

            void SetConfig(impl::ChannelInternalType channel, const ChannelConfig &config);

            void SetSendBuffer(impl::ChannelInternalType channel, void *buf, size_t buf_size, size_t max_packet_size);
            void SetReceiveBuffer(impl::ChannelInternalType channel, void *buf, size_t buf_size);
            void SetSendBufferWithData(impl::ChannelInternalType channel, const void *buf, size_t buf_size, size_t max_packet_size);

            Result Shutdown(impl::ChannelInternalType channel);
        private:
            Result CheckChannelExist(impl::ChannelInternalType channel);

            Result SendErrorPacket(impl::ChannelInternalType channel);

            bool IsSendable(PacketType packet_type) const;
    };

}