// -*- c++ -*-
// Distributed under the BSD 2-Clause License.
// See accompanying file LICENSE for details.
#pragma once

#include <string>
#include <vector>
#include <map>

enum class TargetType
{
	Auto, // Default - deduce from target name and sources extensions

	Executable,
	StaticLibrary,
	DynamicLibrary,
	Object,
	UnitTest,
};

enum class Language
{
	Auto, // Default - deduce language from source extensions

	C,
	Cpp,
	Asm,
};

enum class OutputSystem
{
	Host, // Output for the target system
	Build, // Internal tool during cross-compilation
};

struct BuildConfiguration
{
	TargetType type{TargetType::Auto};
	Language language{Language::Auto};
	OutputSystem system{OutputSystem::Host};
	std::string target;
	std::vector<std::string> sources; // source list
	std::vector<std::string> depends; // internal dependencies
	std::vector<std::string> cxxflags; // flags for c++ compiler
	std::vector<std::string> cflags; // flags for c compiler
	std::vector<std::string> ldflags; // flags for linker
	std::vector<std::string> asmflags; // flags for asm translator
};

using BuildConfigurations = std::vector<BuildConfiguration>;

int reg(const char* location, BuildConfigurations (*cb)());

// Convenience macro - ugly but keeps things simple(r)
#define CONCAT(a, b) CONCAT_INNER(a, b)
#define CONCAT_INNER(a, b) a ## b
#define UNIQUE_NAME(base) CONCAT(base, __LINE__)
#define REG(cb) namespace { int UNIQUE_NAME(unique) = reg(__FILE__, cb); }

// Predefined configuration keys
namespace cfg
{
constexpr auto builddir = "builddir";

constexpr auto host_cc = "host-cc";
constexpr auto host_cxx = "host-cpp";
constexpr auto host_ar = "host-ar";
constexpr auto host_ld = "host-ld";

constexpr auto build_cc = "build-cc";
constexpr auto build_cxx = "build-cpp";
constexpr auto build_ar = "build-ar";
constexpr auto build_ld = "build-ld";
}

const std::map<std::string, std::string>& configuration();
bool hasConfiguration(const std::string& key);
const std::string& getConfiguration(const std::string& key,
                                    const std::string& defaultValue = {});