// Copyright (C) by Josh Blum. See LICENSE.txt for licensing information.

#ifndef INCLUDED_LIBGRAS_IMPL_BLOCK_ACTOR_HPP
#define INCLUDED_LIBGRAS_IMPL_BLOCK_ACTOR_HPP

#include <gras_impl/debug.hpp>
#include <gras_impl/bitset.hpp>
#include <gras/gras.hpp>
#include <gras/block.hpp>
#include <gras/top_block.hpp>
#include <gras/thread_pool.hpp>
#include <Apology/Worker.hpp>
#include <gras_impl/token.hpp>
#include <gras_impl/stats.hpp>
#include <gras_impl/messages.hpp>
#include <gras_impl/output_buffer_queues.hpp>
#include <gras_impl/input_buffer_queues.hpp>
#include <gras_impl/interruptible_thread.hpp>
#include <Theron/Detail/Threading/Atomic.h>
#include <vector>
#include <set>
#include <map>

namespace gras
{

struct BlockActor : Apology::Worker
{
    BlockActor(void);
    ~BlockActor(void);
    Block *block_ptr;
    std::string name; //for debug
    ThreadPool thread_pool;

    //! Priority count to hack in high-prio worker queue
    Theron::Detail::Atomic::UInt32 prioCount;
    GRAS_FORCE_INLINE void highPrioPreNotify(void)
    {
        this->prioCount.Increment();
    }
    GRAS_FORCE_INLINE void highPrioAck(void)
    {
        ASSERT(this->prioCount.Load() != 0);
        this->prioCount.Decrement();
        this->handle_task();
    }
    GRAS_FORCE_INLINE bool hasHighPrioMsg(void)
    {
        //high prio when the count is positive and there are enqueued messages (avoids race)
        return this->prioCount.Load() and this->GetNumQueuedMessages();
    }

    //do it here so we can match w/ the handler declarations
    void register_handlers(void)
    {
        this->RegisterHandler(this, &BlockActor::handle_topology);

        this->RegisterHandler(this, &BlockActor::handle_top_alloc);
        this->RegisterHandler(this, &BlockActor::handle_top_active);
        this->RegisterHandler(this, &BlockActor::handle_top_inert);
        this->RegisterHandler(this, &BlockActor::handle_top_token);
        this->RegisterHandler(this, &BlockActor::handle_top_config);
        this->RegisterHandler(this, &BlockActor::handle_top_thread_group);

        this->RegisterHandler(this, &BlockActor::handle_input_tag);
        this->RegisterHandler(this, &BlockActor::handle_input_msg);
        this->RegisterHandler(this, &BlockActor::handle_input_buffer);
        this->RegisterHandler(this, &BlockActor::handle_input_token);
        this->RegisterHandler(this, &BlockActor::handle_input_check);
        this->RegisterHandler(this, &BlockActor::handle_input_alloc);
        this->RegisterHandler(this, &BlockActor::handle_input_update);

        this->RegisterHandler(this, &BlockActor::handle_output_buffer);
        this->RegisterHandler(this, &BlockActor::handle_output_token);
        this->RegisterHandler(this, &BlockActor::handle_output_check);
        this->RegisterHandler(this, &BlockActor::handle_output_hint);
        this->RegisterHandler(this, &BlockActor::handle_output_alloc);
        this->RegisterHandler(this, &BlockActor::handle_output_update);

        this->RegisterHandler(this, &BlockActor::handle_prop_access);
        this->RegisterHandler(this, &BlockActor::handle_self_kick);
        this->RegisterHandler(this, &BlockActor::handle_get_stats);
    }

    //handlers
    void handle_topology(const Apology::WorkerTopologyMessage &, const Theron::Address);

    void handle_top_alloc(const TopAllocMessage &, const Theron::Address);
    void handle_top_active(const TopActiveMessage &, const Theron::Address);
    void handle_top_inert(const TopInertMessage &, const Theron::Address);
    void handle_top_token(const TopTokenMessage &, const Theron::Address);
    void handle_top_config(const GlobalBlockConfig &, const Theron::Address);
    void handle_top_thread_group(const SharedThreadGroup &, const Theron::Address);

    void handle_input_tag(const InputTagMessage &, const Theron::Address);
    void handle_input_msg(const InputMsgMessage &, const Theron::Address);
    void handle_input_buffer(const InputBufferMessage &, const Theron::Address);
    void handle_input_token(const InputTokenMessage &, const Theron::Address);
    void handle_input_check(const InputCheckMessage &, const Theron::Address);
    void handle_input_alloc(const InputAllocMessage &, const Theron::Address);
    void handle_input_update(const InputUpdateMessage &, const Theron::Address);

    void handle_output_buffer(const OutputBufferMessage &, const Theron::Address);
    void handle_output_token(const OutputTokenMessage &, const Theron::Address);
    void handle_output_check(const OutputCheckMessage &, const Theron::Address);
    void handle_output_hint(const OutputHintMessage &, const Theron::Address);
    void handle_output_alloc(const OutputAllocMessage &, const Theron::Address);
    void handle_output_update(const OutputUpdateMessage &, const Theron::Address);

    void handle_prop_access(const PropAccessMessage &, const Theron::Address);
    void handle_self_kick(const SelfKickMessage &, const Theron::Address);
    void handle_get_stats(const GetStatsMessage &, const Theron::Address);

    //helpers
    void buffer_returner(const size_t index, SBuffer &buffer);
    void mark_done(void);
    void handle_task(void);
    void input_fail(const size_t index);
    void output_fail(const size_t index);
    void sort_tags(const size_t index);
    void trim_tags(const size_t index);
    void trim_msgs(const size_t index);
    void produce(const size_t index, const size_t items);
    void consume(const size_t index, const size_t items);
    void produce_buffer(const size_t index, const SBuffer &buffer);
    void flush_output(const size_t index);

    GRAS_FORCE_INLINE void task_kicker(void)
    {
        if (this->is_work_allowed()) this->Send(SelfKickMessage(), this->GetAddress());
    }

    GRAS_FORCE_INLINE bool is_input_done(const size_t i)
    {
        const bool available = this->input_queues.ready(i) and not this->input_queues.empty(i);
        return this->inputs_done[i] and not available;
    }

    GRAS_FORCE_INLINE bool is_work_allowed(void)
    {
        return (
            not this->hasHighPrioMsg() and
            this->block_state == BLOCK_STATE_LIVE and
            this->inputs_available.any() and
            this->input_queues.all_ready() and
            this->output_queues.all_ready()
        );
    }

    //per port properties
    std::vector<InputPortConfig> input_configs;
    std::vector<OutputPortConfig> output_configs;

    //work buffers for the new work interface
    Block::InputItems input_items;
    Block::OutputItems output_items;

    //track the subscriber counts
    std::vector<Token> input_tokens;
    std::vector<Token> output_tokens;
    BitSet inputs_done;
    BitSet outputs_done;
    std::set<Token> token_pool;

    //buffer queues and ready conditions
    InputBufferQueues input_queues;
    OutputBufferQueues output_queues;
    std::vector<bool> produce_outputs;
    BitSet inputs_available;

    //tag and msg tracking
    std::vector<bool> input_tags_changed;
    std::vector<std::vector<Tag> > input_tags;
    std::vector<size_t> num_input_msgs_read;
    std::vector<std::vector<PMCC> > input_msgs;

    //interruptible thread stuff
    bool interruptible_work;
    SharedThreadGroup thread_group;
    boost::shared_ptr<InterruptibleThread> interruptible_thread;

    //work helpers
    inline void task_work(void)
    {
        block_ptr->work(this->input_items, this->output_items);
    }

    //is the fg running?
    enum
    {
        BLOCK_STATE_INIT,
        BLOCK_STATE_LIVE,
        BLOCK_STATE_DONE,
    } block_state;
    long buffer_affinity;

    std::vector<std::vector<OutputHintMessage> > output_allocation_hints;

    //property stuff
    std::map<std::string, PropertyRegistrySptr> prop_registry;

    BlockStats stats;
};

} //namespace gras

#endif /*INCLUDED_LIBGRAS_IMPL_BLOCK_ACTOR_HPP*/