// Copyright (C) 2014-2015 ChaosForge Ltd
// http://chaosforge.org/
//
// This file is part of Nova libraries. 
// For conditions of distribution and use, see copying.txt file in root folder.

#include "nv/sdl/sdl_window.hh"

#include "nv/core/logging.hh"
#include "nv/lib/gl.hh"
#include "nv/lib/sdl.hh"
#include "nv/sdl/sdl_input.hh"
#include "nv/gl/gl_context.hh"

using namespace nv;

sdl::window::window( device* dev, uint16 width, uint16 height, bool fullscreen, bool msaa )
	: m_device( dev ), m_width( width ), m_height( height ), m_title("Nova Engine"), m_handle( nullptr )
{
	m_input = new sdl::input();
	//	bpp = m_info->vfmt->BitsPerPixel;

	SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 8 );
	SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 8 );
	SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 8 );
	SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 24 );
	SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );

	if ( msaa )
	{
		SDL_GL_SetAttribute( SDL_GL_MULTISAMPLEBUFFERS, 1 );
		SDL_GL_SetAttribute( SDL_GL_MULTISAMPLESAMPLES, 4 );
	}

 	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
 	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);

	SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE );

	SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);

	uint32 flags = SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN;
	if (fullscreen) flags |= SDL_WINDOW_FULLSCREEN;
	m_title.assign( "Nova Engine" );
	m_handle = SDL_CreateWindow( m_title.data(), SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
		width, height, flags );
	if ( m_handle == 0 )
	{
		NV_LOG_CRITICAL( "Video mode set failed: ", SDL_GetError( ) );
		return; // TODO: Error report
	}

// 	NV_LOG_INFO( "Joystick count : ", SDL_NumJoysticks() );
// 	SDL_Joystick* j = SDL_JoystickOpen(0);
// 	if ( j )
// 	{
// 		NV_LOG_INFO( "Joystick Name: ", SDL_JoystickNameForIndex( 0 ) );
// 		NV_LOG_INFO( "Joystick Number of Axes: ", SDL_JoystickNumAxes( j ) );
// 		NV_LOG_INFO( "Joystick Number of Buttons: ", SDL_JoystickNumButtons( j ) );
// 		NV_LOG_INFO( "Joystick Number of Balls: ", SDL_JoystickNumBalls( j ) );
// 	}

 	NV_LOG_INFO( "Joystick count : ", SDL_NumJoysticks() );
	SDL_GameController *controller = NULL;
	int controller_index = 0;
	for ( int i = 0; i < SDL_NumJoysticks(); ++i )
	{
		if ( SDL_IsGameController( i ) )
		{
			controller = SDL_GameControllerOpen( i );
			controller_index = i;
			if ( controller ) break;
			NV_LOG_ERROR( "Could not open gamecontroller ", i, ": ", SDL_GetError() );
		}
	}

	if ( controller )
	{
		SDL_Joystick* j = SDL_GameControllerGetJoystick( controller );
		NV_LOG_INFO( "Controller Name: ", SDL_GameControllerNameForIndex( controller_index ) );
		NV_LOG_INFO( "Controller Number of Axes: ", SDL_JoystickNumAxes( j ) );
		NV_LOG_INFO( "Controller Number of Buttons: ", SDL_JoystickNumButtons( j ) );
		NV_LOG_INFO( "Controller Number of Balls: ", SDL_JoystickNumBalls( j ) );
	}



	void* ctx_handle = SDL_GL_CreateContext( static_cast<SDL_Window*>( m_handle ) );

	if ( ctx_handle == 0 )
	{
		NV_LOG_CRITICAL( "GL Context creation failed: ", SDL_GetError( ) );
		return; // TODO: Error report
	}

	nv::load_gl_library();
	NV_LOG_INFO( "OpenGL Vendor       : ", reinterpret_cast<const char*>( glGetString(GL_VENDOR) ) );
	NV_LOG_INFO( "OpenGL Renderer     : ", reinterpret_cast<const char*>( glGetString( GL_RENDERER ) ) );
	NV_LOG_INFO( "OpenGL Version      : ", reinterpret_cast<const char*>( glGetString( GL_VERSION ) ) );
	NV_LOG_INFO( "OpenGL GLSL Version : ", reinterpret_cast<const char*>( glGetString( GL_SHADING_LANGUAGE_VERSION ) ) );
	SDL_GL_SetSwapInterval(1);

	// TODO: do we really need this?
	glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );

	m_context = new gl_context( m_device, ctx_handle );
	m_context->set_viewport( nv::ivec4( 0, 0, m_width, m_height ) );
}

void sdl::window::set_title( const string_view& title )
{
	SDL_SetWindowTitle( static_cast<SDL_Window*>( m_handle ), title.data() );
	m_title.assign( title );
}

void sdl::window::swap_buffers()
{
	SDL_GL_SwapWindow( static_cast<SDL_Window*>( m_handle ) );
}

sdl::window::~window()
{
	delete m_input;
	if ( m_context )
	{
		SDL_GLContext native = static_cast<SDL_GLContext>( m_context->get_native_handle() );
		delete m_context;
		SDL_GL_DeleteContext( native );
	}
	m_context = nullptr;
	SDL_DestroyWindow( static_cast<SDL_Window*>( m_handle ) );
}

void nv::sdl::window::set_swap_control( bool enabled )
{
	SDL_GL_SetSwapInterval( enabled ? 1 : 0 );
}

void nv::sdl::window::make_current()
{
	SDL_GLContext native = static_cast<SDL_GLContext>( m_context->get_native_handle() );
	SDL_GL_MakeCurrent( static_cast<SDL_Window*>( m_handle ), native );
}

nv::uint32 nv::sdl::window::window_id()
{
	return SDL_GetWindowID( static_cast<SDL_Window*>( m_handle ) );
}