package Tower
import public Entity
import initlater WaveTower
import initlater TrooperTower
import initlater HealbackTower
import initlater FlamethrowerTower
import initlater ArtilleryTower
import Buff
import ClosureTimers

public constant BASIC_TOWER_ID = 'h003'
public constant BASIC_WALL_ID = 'h000'
public constant STOPPER_QUICKBUILD_ID = 'h028'

public class Wall extends UnitEntity

	construct (unit wall)
		super(wall)

public class Tower extends UnitEntity
	EventListener deathListener = null

	construct (unit tower)
		super(tower, tower.getPos3Real())
		deathListener = EventListener.add(actor, EVENT_PLAYER_UNIT_DEATH) ->
			if not done
				terminate()

	construct(Tower oldTower)
		super(oldTower.actor)
		destroy oldTower.deathListener
		oldTower.actor.transferBuffs(actor)
		oldTower.terminate()

		deathListener = EventListener.add(actor, EVENT_PLAYER_UNIT_DEATH) ->
			if not done
				terminate()

	function onAttack(UnitEntity _target)

	/** Called on every upgrade of this tower.
		If this tower has been upgraded to another tier,
		the old tower is terminated and replaced through the new Tower */
	function onUpgrade()
		switch actor.getTypeId()
			case FIRST_WAVE_ID
				this.actor.setEntity(null)
				new WaveTower(this)
			case TOWER_TROOPER_ID
				this.actor.setEntity(null)
				new TrooperTower(this)
			case FLAMETHROWER_ID
				this.actor.setEntity(null)
				new FlamethrowerTower(this)
			case ART_TOWER_ID
				this.actor.setEntity(null)
				new ArtilleryTower(this)
			case HEALBACK_TOWER_ID
				this.actor.setEntity(null)
				new HealbackTower(this)
			default
				printLog(Loglevel.TRACE, "upgrade not catched")
		actor.issueImmediateOrder("stop")

	function pause()
		actor.pause()

	function unpause()
		actor.unpause()

/** Checks if the upgrade unlocks techtree */
function checkTech(unit u)
	if u.getTypeId() == 'h00S' or u.getTypeId() == 'h00T'
		SetPlayerTechMaxAllowed(u.getOwner(), 'h028', -1)

init
	EventListener.add(EVENT_PLAYER_UNIT_CONSTRUCT_START) ->
		let u = GetConstructingStructure()
		let id = u.getTypeId()
		if id == BASIC_TOWER_ID
			new Tower(u)
		else if id == BASIC_WALL_ID or id == STOPPER_QUICKBUILD_ID
			new Wall(u)

	EventListener.add(EVENT_PLAYER_UNIT_UPGRADE_FINISH) ->
		let u = GetTriggerUnit()
		checkTech(u)
		let data = u.getEntity()
		if data != null and data instanceof Tower
			doAfter(0.01, () -> (data castTo Tower).onUpgrade())

	DamageEvent.addListener() ->
		let damager = GetEventDamageSource()
		let damaged = GetTriggerUnit()
		if damager != damaged and damager.getEntity() != null and damaged.isAlive()
			let e = damager.getEntity()
			if e instanceof Tower
				let t = e castTo Tower
				if damaged.getEntity() != null
					t.onAttack(damaged.getEntity())
				else
					t.actor.issueImmediateOrder("stop")