/******************************************************************************
The MIT License(MIT)

Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com

Copyright(c) 2020 jwellbelove

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
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The above copyright notice and this permission notice shall be included in all
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SOFTWARE.
******************************************************************************/

#include "UnitTest++/UnitTest++.h"

#include "etl/shared_message.h"
#include "etl/message.h"
#include "etl/message_router.h"
#include "etl/message_bus.h"
#include "etl/queue.h"
#include "etl/fixed_sized_memory_block_allocator.h"
#include "etl/reference_counted_message_pool.h"

namespace
{
  constexpr etl::message_id_t MessageId1 = 1U;
  constexpr etl::message_id_t MessageId2 = 2U;

  constexpr etl::message_router_id_t RouterId1 = 1U;
  constexpr etl::message_router_id_t RouterId2 = 2U;

  //*************************************************************************
  struct Message1 : public etl::message<MessageId1>
  {
    Message1(int i_)
      : i(i_)
    {
    }

    ~Message1()
    {

    }

    int i;
  };

  //*************************************************************************
  struct Message2 : public etl::message<MessageId2>
  {
    ~Message2()
    {

    }
  };

  //*************************************************************************
  struct Router1 : public etl::message_router<Router1, Message1, Message2>
  {
    Router1()
      : message_router(RouterId1)
      , count_message1(0)
      , count_message2(0)
      , count_unknown_message(0)
    {
    }

    void on_receive(const Message1& message)
    {
      ++count_message1;
    }

    void on_receive(const Message2& message)
    {
      ++count_message2;
    }

    void on_receive_unknown(const etl::imessage& message)
    {

    }

    void clear()
    {
      count_message1 = 0;
      count_message2 = 0;
      count_unknown_message = 0;
    }

    int count_message1;
    int count_message2;
    int count_unknown_message;
  };

  //*************************************************************************
  struct Router2 : public etl::message_router<Router2, Message1>
  {
    Router2()
      : message_router(RouterId2)
      , count_message1(0)
      , count_message2(0)
      , count_unknown_message(0)
    {
    }

    void on_receive(const Message1& message)
    {
      ++count_message1;
    }

    void on_receive_unknown(const etl::imessage& message)
    {
      ++count_unknown_message;
    }

    void clear()
    {
      count_message1 = 0;
      count_message2 = 0;
      count_unknown_message = 0;
    }

    int count_message1;
    int count_message2;
    int count_unknown_message;
  };

  //*************************************************************************
  struct Bus : public etl::message_bus<2U>
  {
  };

  SUITE(test_shared_message)
  {
    Router1 router1;
    Router2 router2;
    Bus     bus;

    using pool_message_parameters = etl::atomic_counted_message_pool::pool_message_parameters<Message1, Message2>;

    etl::fixed_sized_memory_block_allocator<pool_message_parameters::max_size,
                                            pool_message_parameters::max_alignment,
                                            4U> memory_allocator;

    etl::atomic_counted_message_pool message_pool(memory_allocator);

    //*************************************************************************
    class Message2Allocator : public etl::ireference_counted_message_pool
    {
      public:

        static etl::reference_counted_message<Message2, void>& Get()
        {
          static Message2Allocator allocator;
          static Message2 message2;
          static etl::reference_counted_message<Message2, void> rcm2(message2, allocator);

          return rcm2;
        }

        void release(const etl::ireference_counted_message& msg) override
        {
          // Do nothing.
        }
    };

    //*************************************************************************
    TEST(test_move_constructor)
    {
      etl::shared_message sm1(std::move(etl::shared_message(message_pool, Message1(1))));
      CHECK_EQUAL(1, sm1.get_reference_count());
    }

    //*************************************************************************
    TEST(test_default_message_constructor)
    {
      etl::reference_counted_message<Message2, etl::atomic_int>* prcm = message_pool.allocate<Message2>();

      Message2&        m2 = prcm->get_message(); // Check that we can get a non-const reference to the message.
      const Message2& cm2 = prcm->get_message(); // Check that we can get a const reference to the message.

      etl::shared_message sm1(*prcm);

      etl::imessage&        im = sm1.get_message(); // Check that we can get a non-const reference to the message.
      const etl::imessage& cim = sm1.get_message(); // Check that we can get a const reference to the message.

      CHECK_EQUAL(1, sm1.get_reference_count());
      CHECK(sm1.is_valid());
    }
    
    //*************************************************************************
    TEST(test_move_assignment)
    {
      etl::shared_message sm2 = etl::shared_message(message_pool, Message1(2));
      sm2 = std::move(etl::shared_message(message_pool, Message1(3)));
      CHECK_EQUAL(1, sm2.get_reference_count());
      CHECK(sm2.is_valid());
    }

    //*************************************************************************
    TEST(test_send_to_routers)
    {
      bus.clear();
      bus.subscribe(router1);
      bus.subscribe(router2);
      router1.clear();
      router2.clear();

      etl::shared_message sm1(message_pool, Message1(1)); // sm1 holds a Message1 that is owned by message_pool.
      etl::shared_message sm2(message_pool, Message2());  // sm2 holds a Message2 that is owned by message_pool.
      etl::shared_message sm3(Message2Allocator::Get());  // sm3 holds a Message2 that is owned by a statically allocated message pool.
      etl::shared_message sm4(sm1);                       // sm4 is a copy of sm1.

      bus.receive(sm1);
      bus.receive(sm2);
      bus.receive(sm1);
      bus.receive(sm3);
      bus.receive(sm4);            // sm4 is a copy of sm1
      bus.receive(RouterId2, sm1); // Only send sm1 to Router2

      CHECK(sm1.is_valid());
      CHECK(sm2.is_valid());
      CHECK(sm3.is_valid());
      CHECK(sm4.is_valid());

      CHECK_EQUAL(2, sm1.get_reference_count());
      CHECK_EQUAL(1, sm2.get_reference_count());
      CHECK_EQUAL(1, sm3.get_reference_count());
      CHECK_EQUAL(2, sm4.get_reference_count());
      CHECK_EQUAL(3, router1.count_message1);
      CHECK_EQUAL(2, router1.count_message2);
      CHECK_EQUAL(0, router1.count_unknown_message);
      CHECK_EQUAL(4, router2.count_message1);
      CHECK_EQUAL(0, router2.count_message2);
      CHECK_EQUAL(0, router2.count_unknown_message);
    }
  }
}