#include <kurator/universe/TurretType.h>

#include <algorithm>
#include <cmath>


namespace kurator
{
namespace universe
{


double
TurretType::effective_damage(const double distance, const double speed) const
{
	return base_damage * std::round(range_modifier(distance) * tracking_modifier(distance, speed) * 1000) / 1000;
}


double
TurretType::range_modifier(const double distance) const
{
	const auto overflow = distance - optimal_range;
	const auto falloff = std::max(0.0, overflow / optimal_range / falloff_modifier);
	return std::pow(falloff_intensity, std::pow(falloff, 2));
}


double
TurretType::tracking_modifier(const double distance, const double speed) const
{
	const auto simplified_falloff = optimal_range + optimal_range * falloff_modifier;
	const auto by_distance = (distance + 1.0) / simplified_falloff;
	const auto by_speed = tracking / (speed + 1.0);
	return std::min(1.0, std::pow(tracking_factor * by_distance * by_speed, tracking_exponent));
}


double
TurretType::effective_range() const
{
	const double one_point = 1.0 / base_damage;
	const double target_falloff = std::sqrt(std::log2(one_point) / std::log2(falloff_intensity));
	const double one_point_overflow = target_falloff * falloff_modifier * optimal_range;
	return one_point_overflow + optimal_range;
}


double
TurretType::damage_per_second() const
{
	return (base_damage * rounds) / (rounds * rate_of_fire + reload);
}


}  // namespace universe
}  // namespace kurator