package RamisHomingMissle

import Setup
import UnitClass
import Fx
import ClosureEvents


class Missle
	
	static constant real missleStartSpeed = 10
	static constant real speedLost = 0.99
	static constant real speedAccel = 10
	static constant real missleRadius = 65
	static constant real knockback = 50
	static constant real knockbackRange = 500
	
	
	Fx missle
	Unit owner
	Unit target
	vec2 speed
	timer t
	timer destroyTimer
	boolean canHitCaster
	
	construct(Unit owner, Unit target)
		canHitCaster = false
		this.owner = owner
		this.target = target
		vec2 pos = owner.u.getPos()
		vec2 posT = target.u.getPos()
		speed = vec2(0,0).polarOffset(pos.angleTo(posT), missleStartSpeed)
		missle = new Fx(pos.withZ(70), pos.angleTo(posT), "Abilities\\Weapons\\LordofFlameMissile\\LordofFlameMissile.mdl")
		t = getTimer()..setData(this castTo int)..startPeriodic(0.03, () -> GetExpiredTimer().getData() castTo thistype.move())
		destroyTimer = getTimer()
			..setData(this castTo int)
			..start(10, 
			() -> destroy GetExpiredTimer().getData() castTo thistype)
		
	function move()
		speed *= speedLost
		vec2 posmissle = missle.getPos2()
		if not canHitCaster and posmissle.distToVec(owner.u.getPos()) > missleRadius
			canHitCaster = true
		vec2 speedtemp = vec2(0,0).polarOffset(posmissle.angleTo(target.u.getPos()), speedAccel)
		speed += speedtemp
		missle.setXY(posmissle + speed)
		boolean wasHit = false
		ENUM_GROUP.enumUnitsInRange(posmissle + speed, missleRadius)
		if canHitCaster and IsUnitInGroup(owner.u ,ENUM_GROUP)
			for unit u from ENUM_GROUP..enumUnitsInRange(owner.u.getPos(), knockbackRange)
				if u != owner.u
					u.getUserData() castTo Unit.addKnock(owner.u.getPos().angleTo(u.getPos()).toVec((1 - (owner.u.getPos().distToVec(u.getPos()) / knockbackRange)) * knockback))
			destroy this
			return 
		for unit u from ENUM_GROUP
			if owner.u != u
				u.getUserData() castTo Unit.addKnock(posmissle.angleTo(u.getPos()).toVec(knockback))
				wasHit = true
		if wasHit
			destroy this
			
	ondestroy
		destroy missle
		t.release()
		destroyTimer.release()
		

init 
	onUnitCast('A001', (unit caster, int level, unit target) -> new Missle(caster.getUserData() castTo Unit, target.getUserData() castTo Unit))