#include <kurator/sim/systems.h>

#include <kurator/engine/Context.h>
#include <kurator/sim/components.h>
#include <kurator/sim/events.h>
#include <kurator/sim/HitPoints.h>
#include <kurator/stats/events.h>
#include <kurator/universe/UniqueIdentifier.h>


namespace kurator
{
namespace sim
{


void
keep_at_range(engine::Context& ctx)
{
	auto view = ctx.registry.view<Transform, AIState>();
	for (auto&& [entity, self, ai] : view.each()) {
		if (!ctx.registry.valid(ai.target))
			continue;
		const auto target = ctx.registry.get<Transform>(ai.target);
		const auto offset = target.position - self.position;
		ai.destination = target.position - offset.normalized().scale(ai.keep_at_range);
	}
}


void
kill_off_dead(engine::Context& ctx)
{
	auto view = ctx.registry.view<HitPoints>();
	for (auto&& [entity, points] : view.each()) {
		if (points.is_alive())
			continue;
		if (ctx.registry.all_of<universe::UniqueIdentifier, Team>(entity)) {
			const auto& [identifier, team] = ctx.registry.get<universe::UniqueIdentifier, Team>(entity);
			ctx.dispatcher.trigger(stats::ShipLeft{ctx.clock.game, identifier, team.id, true});
			ctx.dispatcher.trigger(Destroyed{entity});
		}
		ctx.registry.destroy(entity);
	}
}


}  // namespace sim
}  // namespace kurator