#ifndef slic3r_GUI_format_hpp_
#define slic3r_GUI_format_hpp_

// Functional wrapper around boost::format.
// One day we may replace this wrapper with C++20 format
// https://en.cppreference.com/w/cpp/utility/format/format
// though C++20 format uses a different template pattern for position independent parameters.
// This wrapper also manages implicit conversion from wxString to UTF8 and format_wxstr() variants are provided to format into wxString.

#include <libslic3r/format.hpp>

#include <wx/string.h>

namespace Slic3r { 
namespace GUI { 

// Format input mixing UTF8 encoded strings (const char*, std::string) and wxStrings, return a wxString.
template<typename... TArgs>
inline wxString format_wxstr(const char* fmt, TArgs&&... args) {
	boost::format message(fmt);
	return wxString::FromUTF8(Slic3r::internal::format::format_recursive(message, std::forward<TArgs>(args)...).c_str());
}
template<typename... TArgs>
inline wxString format_wxstr(const std::string& fmt, TArgs&&... args) {
	boost::format message(fmt);
	return wxString::FromUTF8(Slic3r::internal::format::format_recursive(message, std::forward<TArgs>(args)...).c_str());
}
template<typename... TArgs>
inline wxString format_wxstr(const wxString& fmt, TArgs&&... args) {
	return format_wxstr(fmt.ToUTF8().data(), std::forward<TArgs>(args)...);
}
template<typename... TArgs>
inline std::string format(const char* fmt, TArgs&&... args) {
    return Slic3r::format(fmt, std::forward<TArgs>(args)...);
}
template<typename... TArgs>
inline std::string format(const std::string& fmt, TArgs&&... args) {
    return Slic3r::format(fmt, std::forward<TArgs>(args)...);
}
template<typename... TArgs>
inline std::string format(const wxString& fmt, TArgs&&... args) {
    return Slic3r::format(fmt.ToUTF8().data(), std::forward<TArgs>(args)...);
}

} // namespace GUI

namespace internal {
	namespace format {
		// Wrapper around wxScopedCharBuffer to indicate that the content is UTF8 formatted.
		struct utf8_buffer { 
			// wxScopedCharBuffer is reference counted, therefore copying by value is cheap.
			wxScopedCharBuffer data;
		};
		// Accept wxString and convert it to UTF8 to be processed by Slic3r::format().
		inline const utf8_buffer cook(const wxString &arg) {
			return utf8_buffer { arg.ToUTF8() };
		}
		// Vojtech seemingly does not understand perfect forwarding:
		// Why Slic3r::internal::format::cook(T&& arg) is taken for non-const wxString reference?
		inline const utf8_buffer cook(wxString &arg) {
			return utf8_buffer { arg.ToUTF8() };
		}
		inline const utf8_buffer cook(wxString &&arg) {
			return utf8_buffer{ arg.ToUTF8() };
		}
	}
}

} // namespace Slic3r

namespace boost {
	namespace io {
		namespace detail {
			// Adaptor for boost::format to accept wxString converted to UTF8.
			inline std::ostream& operator<<(std::ostream& os, const Slic3r::internal::format::utf8_buffer& str) {
				os << str.data.data();
				return os;
			}
		}
	}
}

#endif /* slic3r_GUI_format_hpp_ */