/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/

#include "UnitFormatter.hpp"
#include <string>
#include <sstream>
#include <iomanip>

namespace
{
	template<typename T> static std::string formatValue(T value, int precision)
	{
		std::ostringstream stream;
		stream << std::fixed << std::setprecision(precision) << value;
		return stream.str();
	}
}

namespace OpenVulkano
{
	UnitFormatter::UnitFormatter(bool useMetric, int precisionDigits) : metric(useMetric), precision(precisionDigits) {}

	std::string UnitFormatter::Format(units::length::meter_t distance)
	{
		if (metric)
		{
			if (distance >= units::length::kilometer_t(1))
			{
				return formatValue(units::length::kilometer_t(distance).value(), precision) + " km";
			}
			return formatValue(distance.value(), precision) + " m";
		}
		else
		{
			auto distanceFeet = units::length::foot_t(distance).value();
			if (distanceFeet >= 5280.0)
			{
				return formatValue(units::length::mile_t(distance).value(), precision) + " mi";
			}
			return formatValue(distanceFeet, precision) + " ft";
		}
	}

	std::string UnitFormatter::Format(units::area::square_meter_t area)
	{
		if (metric)
		{
			if (area >= units::area::square_kilometer_t(1))
			{
				return formatValue(units::area::square_kilometer_t(area).value(), precision) + " km²";
			}
			return formatValue(area.value(), precision) + " m²";
		}
		else
		{
			auto areaSquareFeet = units::area::square_foot_t(area).value();
			if (areaSquareFeet >= 27878400.0)
			{
				return formatValue(units::area::square_mile_t(area).value(), precision) + " mi²";
			}
			return formatValue(areaSquareFeet, precision) + " ft²";
		}
	}
}