package game

type areaEffect interface {
	onEntering(Permanent)
	onLeaving(Permanent)
}

type dynamicAreaEffect struct {
	_onEntering func(Permanent)
	_onLeaving  func(Permanent)
}

func newDynamicAreaEffect(enter func(Permanent), leave func(Permanent)) *dynamicAreaEffect {
	return &dynamicAreaEffect{enter, leave}
}

func (e *dynamicAreaEffect) onEntering(p Permanent) {
	if e._onEntering != nil {
		e._onEntering(p)
	}
}

func (e *dynamicAreaEffect) onLeaving(p Permanent) {
	if e._onLeaving != nil {
		e._onLeaving(p)
	}
}

func newCombinedAreaEffect(aoes []areaEffect) *dynamicAreaEffect {
	return &dynamicAreaEffect{
		_onEntering: func(p Permanent) {
			for _, aoe := range aoes {
				aoe.onEntering(p)
			}
		},
		_onLeaving: func(p Permanent) {
			for _, aoe := range aoes {
				aoe.onLeaving(p)
			}
		},
	}
}

func newGrantFullActionEffect(cardPath string, f ActionFuncPrototype, desc, tag string,
) *dynamicAreaEffect {
	onEntering := func(p Permanent) {
		if cardPath != "*" && p.Card().Path() != cardPath {
			return
		}

		u := p.(*Unit)
		fa := newFullAction(u, f, desc)
		fa.tag = tag
		u.FullActions = append(u.FullActions, fa)
	}

	onLeaving := func(p Permanent) {
		if cardPath != "*" && p.Card().Path() != cardPath {
			return
		}
		u := p.(*Unit)
		u.removeFullAction(tag)
	}

	return newDynamicAreaEffect(onEntering, onLeaving)
}

func newAdjustmentAreaEffect(adjust func(Permanent, int), delta int) *dynamicAreaEffect {
	onEntering := func(p Permanent) {
		u := p.(*Unit)
		e := newAdjustmentEffect(adjust, u, delta)
		e.apply(u.controller.gameState)
	}

	onLeaving := func(p Permanent) {
		u := p.(*Unit)
		e := newAdjustmentEffect(adjust, u, delta)
		e.end(u.controller.gameState)
	}

	return newDynamicAreaEffect(onEntering, onLeaving)
}