#include <stdexcept>

// add your Color class here
// you may but are not required to add a header file
// do not modify anything else

#define CATCH_CONFIG_MAIN
#include "catch.hpp"
#include <sstream>

std::string str(Color const& c)
{
  std::ostringstream oss;
  oss << c;
  return oss.str();
}

TEST_CASE("construction")
{
  CHECK_NOTHROW( (Color{1,255,0,255}) );
  CHECK_NOTHROW( (Color{100,200,0}) );
  CHECK_NOTHROW( (Color{75,140,60}) );
  CHECK_NOTHROW( (Color{128}) );
  CHECK_THROWS( (Color{256,-1,256,-1}) );
}

TEST_CASE("print")
{
  CHECK( str(Color{50,80,20,128}) == "{50, 80, 20}");
}

TEST_CASE("add color")
{
  Color a{100,200,0};
  Color b{50,80,120};
  Color c{75,140,60};
  
  REQUIRE( str(Color{50,80,20}) == "{50, 80, 20}");
  
  CHECK( str(a+b) == str(c) );
  CHECK( str(a+c) != str(b) );
  CHECK( str(b+c) != str(a) );
}

TEST_CASE("add grayscale")
{
  Color a{100,200,0};
  Color b{100,150,50};
  
  REQUIRE( str(Color{50,80,20}) == "{50, 80, 20}");
  
  CHECK( str(a+100) == str(b) );
  CHECK( str(100+a) == str(b) );
}