#pragma once
#ifndef REAL_BUILD
# include "externals.hh"
#endif

/*= Utilities ================================================================*/

// Disable next ImGui button(s)
void disableButton( );
// Re-enable ImGui buttons
inline void reenableButtons( )
{
	ImGui::PopStyleColor( 3 );
}

/*----------------------------------------------------------------------------*/

#define GL_CHECK( FAIL ) \
	do { \
		auto err_( glGetError( ) ); \
		if ( err_ != GL_NO_ERROR ) FAIL; \
	} while ( 0 )

#define GL_ASSERT( ) \
	GL_CHECK({ \
		fprintf( stderr , "GL error %x in %s:%d\n" , \
				err_ , __FILE__ , __LINE__ ); \
		abort( ); \
	})

/*----------------------------------------------------------------------------*/

// Add some value to an angle, keeping it in [-180;180]
void updateAngle(
		__rw__	float& initial ,
		__rd__	const float delta
	);
// Make a rotation matrix from three YPR angles (in degrees)
void anglesToMatrix(
		__rd__	float const* angles ,
		__wr__	float* matrix );

/*----------------------------------------------------------------------------*/

// Helpers for finding entries in collections
template< typename T , typename I >
inline auto find(
		__rd__ T const& collection ,
		__rd__ I const& item )
{
	return std::find( collection.begin( ) , collection.end( ) , item );
}

template< typename T , typename I >
inline auto find(
		__rw__ T& collection ,
		__rd__ I const& item )
{
	return std::find( collection.begin( ) , collection.end( ) , item );
}


/*= T_FilesWatcher / T_WatchedFiles ==========================================*/

struct T_FilesWatcher;
struct T_WatchedFiles;
using F_OnFileChanges = std::function< void( void ) >;

struct T_FilesWatcher
{
	friend struct T_WatchedFiles;

	T_FilesWatcher( T_FilesWatcher const& ) = delete;

	T_FilesWatcher( );
	T_FilesWatcher( T_FilesWatcher&& ) noexcept;
	~T_FilesWatcher( );

	void check( );

    private:
	int fd;
	std::vector< T_WatchedFiles* > watched;
};

/*----------------------------------------------------------------------------*/

struct T_WatchedFiles
{
	friend struct T_FilesWatcher;

	T_WatchedFiles( ) = delete;
	T_WatchedFiles( T_WatchedFiles const& ) = delete;

	T_WatchedFiles( T_WatchedFiles&& ) noexcept;
	T_WatchedFiles(
			__rw__ T_FilesWatcher& watcher ,
			__rd__ const F_OnFileChanges callback );

	~T_WatchedFiles( );

	void clear( );
	bool watch( __rd__ std::string const& file );

    private:
	T_FilesWatcher* watcher;
	const F_OnFileChanges callback;
	bool triggered;
	std::vector< int > identifiers;
};