#include "GameConfig.hpp"
#include <rw/defines.hpp>
#include <cstring>
#include <cstdlib>

#include <ini.h>

const std::string kConfigDirectoryName("OpenRW");

GameConfig::GameConfig(const std::string& configName, const std::string& configPath)
	: m_configName(configName)
	, m_configPath(configPath)
	, m_valid(false)
	, m_inputInvertY(false)
{
	if (m_configPath.empty())
	{
		m_configPath = getDefaultConfigPath();
	}

	// Look up the path to use
	auto configFile = getConfigFile();

	if (ini_parse(configFile.c_str(), handler, this) < 0)
	{
		m_valid = false;
	}
	else
	{
		m_valid = true;
	}
}

std::string GameConfig::getConfigFile()
{
	return m_configPath + "/" + m_configName;
}

bool GameConfig::isValid()
{
	return m_valid;
}

std::string GameConfig::getDefaultConfigPath()
{
#if defined(RW_LINUX) || defined(RW_FREEBSD)
	char* config_home = getenv("XDG_CONFIG_HOME");
	if (config_home != nullptr) {
		return std::string(config_home) + "/" + kConfigDirectoryName;
	}
	char* home = getenv("HOME");
	if (home != nullptr) {
		return std::string(home) + "/.config/" + kConfigDirectoryName;
	}

#elif defined(RW_OSX)
	char* home = getenv("HOME");
	if (home)
		return std::string(home) + "/Library/Preferences/" + kConfigDirectoryName;

#else
#error Dont know how to find default config path
#endif

	// Well now we're stuck.
	RW_ERROR("No default config path found.");
	return ".";
}

int GameConfig::handler(void* user,
						 const char* section,
						 const char* name,
						 const char* value)
{
	auto self = static_cast<GameConfig*>(user);
#define MATCH(_s, _n) (strcmp(_s, section) == 0 && strcmp(_n, name) == 0)

	if (MATCH("game", "path"))
	{
		self->m_gamePath = value;
	}
	else if (MATCH("input", "invert_y"))
	{
		self->m_inputInvertY = atoi(value) > 0;
	}
	else
	{
		RW_MESSAGE("Unhandled config entry [" << section << "] " << name << " = " << value);
		return 0;
	}

	return 1;

#undef MATCH
}