/*

Copyright (c) 2016, Arvid Norberg
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the distribution.
    * Neither the name of the author nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

*/

#include "libtorrent/config.hpp"
#include "test.hpp"
#include "libtorrent/receive_buffer.hpp"

using namespace libtorrent;

struct allocator : buffer_allocator_interface
{
	void free_disk_buffer(char*) {}
	char* allocate_disk_buffer(char const*) { TORRENT_ASSERT(false); return NULL; }
	char* allocate_disk_buffer(bool&
		, boost::shared_ptr<disk_observer>
		, char const*) { TORRENT_ASSERT(false); return NULL; }
	char* async_allocate_disk_buffer(char const*
		, boost::function<void(char*)> const&) { TORRENT_ASSERT(false); return NULL; }
	void reclaim_block(block_cache_reference ref) {}
};

TORRENT_TEST(recv_buffer_init)
{
	allocator a;
	receive_buffer b(a);

	b.cut(0, 10);

	TEST_EQUAL(b.packet_size(), 10);
	TEST_EQUAL(b.packet_bytes_remaining(), 10);
	TEST_EQUAL(b.packet_finished(), false);
	TEST_EQUAL(b.pos(), 0);
	TEST_EQUAL(b.capacity(), 0);
}

TORRENT_TEST(recv_buffer_pos_at_end_false)
{
	allocator a;
	receive_buffer b(a);

	b.cut(0, 1000);
	// allocate some space to receive into
	boost::array<boost::asio::mutable_buffer, 2> vec;
	int num_bufs = b.reserve(vec, 1000);

	// since we don't have a disk buffer, there should only be a single
	// range/buffer
	TEST_EQUAL(num_bufs, 1);

	b.received(1000);
	b.advance_pos(999);

	TEST_EQUAL(b.pos_at_end(), false);
}

TORRENT_TEST(recv_buffer_pos_at_end_true)
{
	allocator a;
	receive_buffer b(a);
	b.cut(0, 1000);
	b.reserve(1000);
	boost::array<boost::asio::mutable_buffer, 2> vec;
	int num_bufs = b.reserve(vec, 1000);
	TEST_EQUAL(num_bufs, 1);
	b.received(1000);
	b.advance_pos(1000);
	TEST_EQUAL(b.pos_at_end(), true);
}

TORRENT_TEST(recv_buffer_packet_finished)
{
	allocator a;
	receive_buffer b(a);
	// packet_size = 10
	b.cut(0, 10);
	b.reserve(1000);
	boost::array<boost::asio::mutable_buffer, 2> vec;
	int num_bufs = b.reserve(vec, 1000);
	TEST_EQUAL(num_bufs, 1);
	b.received(1000);

	for (int i = 0; i < 10; ++i)
	{
		TEST_EQUAL(b.packet_finished(), false);
		b.advance_pos(1);
	}
	TEST_EQUAL(b.packet_finished(), true);
}

TORRENT_TEST(recv_buffer_disk_buffer)
{
	char disk_buffer; // fake disk buffer pointer

	allocator a;
	receive_buffer b(a);
	b.reserve(1000);
	b.cut(0, 1000); // packet size = 1000
	boost::array<boost::asio::mutable_buffer, 2> vec;
	b.assign_disk_buffer(&disk_buffer, 137);
	int num_bufs = b.reserve(vec, 1000);
	TEST_EQUAL(num_bufs, 2);

	// regular buffer   disk buffer
	// -----------------======
	//
	// |----------------------| 1000
	//                  |-----| 137
	// |----------------|    863

	TEST_EQUAL(boost::asio::buffer_size(vec[0]), 863);
	TEST_EQUAL(boost::asio::buffer_size(vec[1]), 137);
}

#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)

TORRENT_TEST(recv_buffer_mutable_buffers_regular_and_disk)
{
	char disk_buffer; // fake disk buffer pointer

	allocator a;
	receive_buffer b(a);
	b.reserve(1100);
	b.cut(0, 100); // packet size = 100
	b.received(1100);
	int packet_transferred = b.advance_pos(1100);
	// this is just the first packet
	TEST_EQUAL(packet_transferred, 100);
	// the next packet is 1000, and we're done with the first 100 bytes now
	b.cut(100, 1000); // packet size = 1000
	// and it has a disk buffer
	b.assign_disk_buffer(&disk_buffer, 137);
	std::vector<boost::asio::mutable_buffer> vec;
	packet_transferred = b.advance_pos(999);
	TEST_EQUAL(packet_transferred, 999);
	b.mutable_buffers(vec, 999);
	TEST_EQUAL(vec.size(), 2);

	// previous packet
	//   |
	//   v   regular buffer   disk buffer
	// - - - -----------------======
	//       ^
	//       |
	// m_recv_start

	//       |----------------------| 1000 packet size
	//                        |-----| 137 disk buffer
	//       |----------------|    863 regular buffer

	TEST_EQUAL(boost::asio::buffer_size(vec[0]), 863);
	TEST_EQUAL(boost::asio::buffer_size(vec[1]), 137 - 1);
	TEST_EQUAL(boost::asio::buffer_size(vec[0])
		+ boost::asio::buffer_size(vec[1]), 999);
}

TORRENT_TEST(recv_buffer_mutable_buffers_regular_only)
{
	allocator a;
	receive_buffer b(a);
	b.reserve(1100);
	b.cut(0, 100); // packet size = 100
	b.received(1100);
	int packet_transferred = b.advance_pos(1100);
	// this is just the first packet
	TEST_EQUAL(packet_transferred, 100);
	// the next packet is 1000, and we're done with the first 100 bytes now
	b.cut(100, 1000); // packet size = 1000
	std::vector<boost::asio::mutable_buffer> vec;
	packet_transferred = b.advance_pos(999);
	TEST_EQUAL(packet_transferred, 999);
	b.mutable_buffers(vec, 999);
	TEST_EQUAL(vec.size(), 1);

	// previous packet
	//   |
	//   v   regular buffer
	// - - - -----------------------
	//       ^
	//       |
	// m_recv_start

	//       |----------------------| 1000 packet size
	//       |---------------------|  999 regular buffer

	TEST_EQUAL(boost::asio::buffer_size(vec[0]), 999);
}

TORRENT_TEST(recv_buffer_mutable_buffers_disk)
{
	char disk_buffer; // fake disk buffer pointer

	allocator a;
	receive_buffer b(a);
	b.reserve(1100);
	b.cut(0, 100); // packet size = 100
	b.received(1100);
	int packet_transferred = b.advance_pos(1100);
	// this is just the first packet
	TEST_EQUAL(packet_transferred, 100);
	// the next packet is 1000, and we're done with the first 100 bytes now
	b.cut(100, 1000); // packet size = 1000
	// and it has a disk buffer
	b.assign_disk_buffer(&disk_buffer, 1000);
	std::vector<boost::asio::mutable_buffer> vec;
	packet_transferred = b.advance_pos(999);
	TEST_EQUAL(packet_transferred, 999);
	b.mutable_buffers(vec, 999);
	TEST_EQUAL(vec.size(), 1);

	// previous packet
	//   |
	//   v   disk buffer
	// - - - =======================
	//       ^
	//       |
	// m_recv_start

	//       |----------------------| 1000 packet size
	//       |----------------------| 999 disk buffer

	TEST_EQUAL(boost::asio::buffer_size(vec[0]), 999);
	TEST_EQUAL(boost::asio::buffer_cast<char*>(vec[0]), &disk_buffer);
}

#endif