#include <kurator/sim/HitPoints.h>

#include <algorithm>

#include <kurator/universe/ShipType.h>


namespace kurator
{
namespace sim
{


HitPoints::HitPoints(const universe::ShipType& def) :
	structure {def.base_structure_points, def.base_structure_resists},
	armour {def.base_armour_points, def.base_armour_resists},
	shield {def.base_shield_points, def.base_shield_resists}
{
}


double
HitPoints::Layer::consume(double& damage)
{
	if (damage <= 0.0 || points <= 0.0)
		return 0.0;
	const double modifier = 1.0 - resists;
	const double potential_damage = damage * modifier;
	const double taken_damage = std::min(potential_damage, points);
	const double left_to_deal = (potential_damage - taken_damage) / modifier;
	points -= taken_damage;
	damage = left_to_deal;
	return taken_damage;
}


double
HitPoints::deal(double damage)
{
	return shield.consume(damage) + armour.consume(damage) + structure.consume(damage);
}


bool
HitPoints::is_alive() const
{
	return structure.points > 0.0;
}


double
HitPoints::total() const
{
	return shield.points + armour.points + structure.points;
}


}  // namespace sim
}  // namespace kurator