import bge # Blender Game Engine (UPBGE)
import aud # Sounds 
import threading # Multithreading
import trace
import sys
import time
import math
import mathutils
import random

###############################################################################
# ct_lib.py
# @title: User library
# @project: CodeTower
# @lang: fr,en
# @authors: Philippe Roy <philippe.roy@ac-grenoble.fr>
# @copyright: Copyright (C) 2022 Philippe Roy
# @license: GNU GPL
#
# This game is a tower defense coding game. The towers are driven by Python code.
# Ce simulateur est un jeu du type tower defense où les tours sont à piloter par la programmation Python.
#
# Commands trigged by button : cmd_*
# Commands trigged by 3D scene objects : scn_*
# Commands trigged by user (student or map designer) : ct_*
# 3D scene manipulation : manip_*
# 
###############################################################################

scene = bge.logic.getCurrentScene()

# Colors
tower_purple = [0.202, 0.114, 0.521,1]
tower_turquoise = [0.051, 0.270, 0.279,1]
tower_magenta = [0.799, 0.005, 0.314,1]
tower_orange =  [0.799, 0.130, 0.063,1]
tower_yellow =  [0.799, 0.617, 0.021, 1]
tower_green =  [0.246, 0.687, 0.078, 1]
tower_red =  [0.799, 0.031, 0.038, 1]
tower_blue =  [0.127, 0.456, 1.000, 1]
tower_black =  [0, 0, 0, 1]

ray_yellow =  [0.799, 0.617, 0.021, 1] # [0.8, 0.619, 0.021])
ray_blue =  [0.127, 0.456, 1.000, 1]
ray_black =  [0, 0, 0, 1]

color_kaykit_black =  [0.019, 0.032, 0.037, 1]

# Sounds
audiodev = aud.Device()
snd_build = aud.Sound('asset/sounds/build.wav')
sndbuff_build = aud.Sound.cache(snd_build)
snd_archer = aud.Sound('asset/sounds/archer.wav')
sndbuff_archer = aud.Sound.cache(snd_archer)
snd_mage = aud.Sound('asset/sounds/mage.wav')
sndbuff_mage = aud.Sound.cache(snd_mage)
snd_life = aud.Sound('asset/sounds/life.ogg')
sndbuff_life = aud.Sound.cache(snd_life)

###############################################################################    
# Données générales
###############################################################################

def ct_level_current():
    return  scene.objects['Points']['level']

def ct_level():
    return  scene.objects['Points']['level_max']

###############################################################################    
# Méthode kill pour les tâches (threads)
###############################################################################

class thread_with_trace(threading.Thread):
    def __init__(self, *args, **keywords):
        threading.Thread.__init__(self, *args, **keywords)
        self.killed = False
       
    def start(self):
        self.__run_backup = self.run
        self.run = self.__run     
        threading.Thread.start(self)
       
    def __run(self):
        sys.settrace(self.globaltrace)
        self.__run_backup()
        self.run = self.__run_backup
       
    def globaltrace(self, frame, event, arg):
        if event == 'call':
            return self.localtrace
        else:
            return None
 
    def localtrace(self, frame, event, arg):
        if self.killed:
            if event == 'line':
                raise SystemExit()
        return self.localtrace
 
    def kill(self):
        self.killed = True

###############################################################################    
# Start et stop des tâches (threads)
###############################################################################

def thread_start(threads, type_txt, fct):
    threads.append(thread_with_trace(target = fct))
    threads[len(threads)-1].start()
    print ("Thread",type_txt, "#", len(threads)-1, "open.")

def thread_stop(threads, type_txt):
    i=0
    zombie_flag=False
    for t in threads:
        if not t.is_alive():
            print ("Thread",type_txt, "#",i,"closed.")
        else:
            print ("Thread",type_txt, "#",i,"still open ...")
            t.kill()
            t.join()
            if not t.is_alive():
                print ("Thread",type_txt, "#",i,"killed.")
            else:
                print ("Thread",type_txt, "#",i,"zombie...")
                zombie_flag=True
        i +=1
    if zombie_flag==False:
        print ("All threads",type_txt, "are closed.")
        return True
    else:
        print ("There are zombies threads",type_txt, ".")
        return False

###############################################################################    
# Vagues (minions)
###############################################################################

# Minion caracteristics : category (class), level, hp, speed, armor, bounty, lifes_damage
# Minion 3d object : body (male,female,old, ...), variante (A,B,C,D, ...), level

# Création d'un minion
def ct_minion(x,y,cat,level):
    category=cat+"-lv"+str(level)
    minion_3d= scene.objects['Terrain']['minion_3d']
    body = random.choice(minion_3d[category][0])+"_"+random.choice(minion_3d[category][1])+"_"+random.choice(minion_3d[category][2])
    ct_minion_details(x,y,cat,level,body)

# Création d'un minion détaillée
def ct_minion_details(x,y,cat,level,body="Knight_m_A_common"):
    category=cat+"-lv"+str(level)

    # Pause
    while  scene.objects['Terrain']['run'] == False:
        time.sleep(0.01)

    # Object 3D
    minion= scene.addObject(body, scene.objects['Terrain'])
    minion.worldScale=[0.25,0.25,0.25]
    minion.worldPosition=[x,y,0.1]
    scene.objects['Terrain']['idm']=scene.objects['Terrain']['idm']+1
    minion.name="wm("+str(scene.objects['Terrain']['idm'])+")" # Wave minion (wm), identifier minion (idm)
    scene.objects['Points']['minions'] +=1
    scene.objects['Points']['minions_run'] +=1

    # Caracteristics
    minion_carac= scene.objects['Terrain']['minion_carac']
    minion['cat']=minion_carac[category][0]
    minion['level']=minion_carac[category][1]
    minion['hp']=minion_carac[category][2]
    minion['speed']=minion_carac[category][3]
    minion['speed_base']=minion_carac[category][3]
    minion['armor']=minion_carac[category][4]
    minion['bounty']=minion_carac[category][5]
    minion['lifes_damage']=minion_carac[category][6]
    minion['buff']=[]
    minion['resist']=[]

    # Actuator Steering
    minion.actuators['Steering'].navmesh=scene.objects[scene.objects['Terrain']['navmesh']]
    minion.actuators['Steering'].target=scene.objects[scene.objects['Terrain']['endtile']]
    minion.actuators['Steering'].distance=0.5
    minion.actuators['Steering'].velocity=minion['speed_base']*scene.objects['Terrain']['speed']

# Destruction d'un minion
def scn_minion_dead(cont):
    obj = cont.owner
    scene.objects['Points']['minions'] -=1
    scene.objects['Points']['minions_run'] -=1
    scene.objects['Points']['kills'] +=1
    scene.objects['Points']['coins']= scene.objects['Points']['coins']+obj['bounty']
    obj.endObject()

###############################################################################    
# Spells
###############################################################################

# Buff/debuff  Minion
def scn_minion_affect(cont):
    obj = cont.owner
    # print (obj.name, obj['buff'])
    slow_state=False

    # Etats actif 
    for debuff_i in obj['buff']:
        if debuff_i[1] <= 0:
            obj['buff'].remove(debuff_i)
            continue
        if debuff_i[0] == "slow":
            slow_state=True
        debuff_i[1] -= scene.objects['Terrain']['speed']

    # Effets
    if slow_state:
        obj.actuators['Steering'].velocity =(obj['speed_base']*scene.objects['Terrain']['speed'])/2
    else:
        obj.actuators['Steering'].velocity = obj['speed_base']*scene.objects['Terrain']['speed']

###############################################################################    
# Tours
###############################################################################

# Tower  caracteristics : category (class), damage, speed, range

# Création d'une tour
def ct_build(x,y, cat='Archer tower', tower_name="Tower", color=tower_purple, tower_3d="square-A"):
    tower_minion_3d= scene.objects['Terrain']['tower_minion_3d']
    if cat=='Archer tower': # Archer
        category="Archer-lv1"
    if cat=='Mage tower': # Mage
        category="Mage-lv1"
    body = random.choice(tower_minion_3d[category][0])+"_"+random.choice(tower_minion_3d[category][1])+"_"+random.choice(tower_minion_3d[category][2])
    ct_build_details(x,y, cat, tower_name, color, tower_3d, body)

# Création d'une tour détaillée
def ct_build_details(x,y, cat='Archer tower', tower_name="Tower", color=tower_purple, tower_3d="square-A", body="Archer_m_A_common"):

    # Vérification de la place
    if [x,y] in scene.objects['Terrain']['scene_tile_noncontruct'] or [x,y] in scene.objects['Terrain']['scene_tile_tower']:
        return False
    
    # Vérification du niveau
    scene.objects['Points']['level']= scene.objects['Points']['level'] + 1
    if scene.objects['Points']['level'] > scene.objects['Points']['level_max'] :
        tour= scene.addObject("Tower_error", scene.objects['Terrain'])
        tour.worldPosition=[x,y,0.2]
        tour.worldScale=[1,1,1]
        scene.objects['Terrain']['scene_tile_tower'].append([x,y])
        return False

    # Objets 3D
    tour= scene.addObject('Tower-'+tower_3d, scene.objects['Terrain'])
    tour.color = color
    tour.worldPosition=[x,y,0.2]
    tour.worldScale=[1,1,1]
    scene.objects['Terrain']['scene_tile_tower'].append([x,y])
    tower_minion= scene.addObject(body, scene.objects['Terrain'])
    tower_minion["type_towerminion"]=False
    tower_minion.name="tm("+str(x)+','+str(y)+")" # Tower minion (tm)
    tower_minion.worldPosition=[x,y,1]
    tower_minion.worldScale=[0.25,0.25,0.25]

    # Sounds
    audiodev.play(sndbuff_build)
 
    # Caracteristics
    tower_carac= scene.objects['Terrain']['tower_carac']
    tour['cat']=tower_carac[cat][0]
    tour['tower_name']=tower_name
    tour['xp']=0
    tour['lvl_current']=1
    tour['lvl']=1
    tour['damage']=tower_carac[cat][1]
    tour['speed']=tower_carac[cat][2]
    tour['range']=tower_carac[cat][3]
    tour['techno']=[]
    tour['cast']="slow"
    tour['cast_duration']=2

    # Capteur Near
    tour.sensors['Near'].distance=tour['range']
    tour.sensors['Near'].skippedTicks =round(1/(tour['speed']*scene.objects['Terrain']['speed']))
    return True

# Suppression d'une tour
def ct_remove(x,y):
    for obj_i in scene.objects:
        if "type_tower" in obj_i.getPropertyNames():
            if x == obj_i.worldPosition.x and y == obj_i.worldPosition.y:
                scene.objects["tm("+str(round(obj_i.worldPosition.x))+','+str(round(obj_i.worldPosition.y))+")"].endObject()
                obj_i.endObject()
                scene.objects['Points']['level']= scene.objects['Points']['level'] - 1

# Réaction d'une tour
def scn_tower_near(cont):
    obj = cont.owner
    sensor = obj.sensors['Near']

    # Tir
    # FIXME: tir sur le plus avancé
    if sensor.positive and len(sensor.hitObjectList)>0 and scene.objects['Terrain']['run']==True :
        target=sensor.hitObjectList[0]

        # Orientation du tower minion
        towerminion="tm("+str(round(obj.worldPosition.x))+','+str(round(obj.worldPosition.y))+")"
        angle =math.atan((target.worldPosition.y-obj.worldPosition.y)/(target.worldPosition.x-obj.worldPosition.x))
        if target.worldPosition.x>obj.worldPosition.x:
            angle2=math.pi/2+angle-scene.objects[towerminion].worldOrientation.to_euler().z
            angle3=angle
        else:
            angle2=math.pi+math.pi/2+angle-scene.objects[towerminion].worldOrientation.to_euler().z
            angle3=math.pi+angle
        scene.objects[towerminion].applyRotation((0, 0, angle2), False)

        # Bullet (3d object) (vitesse lente) # -> tendance au plantage
        # if scene.objects['Terrain']['speed']<1:
        #     bullet= scene.addObject("Bullet", scene.objects['Terrain'])
        #     bullet.mass=0.001 # bullet.applyForce=((0,0,9.81),True)
        #     bullet.worldPosition=[obj.worldPosition.x,obj.worldPosition.y,1.5]
        #     bullet.worldScale=[0.75,0.75,0.75]
        #     # bullet.worldScale=[0.5,0.5,0.5]
        #     bullet.worldLinearVelocity.x = (target.worldPosition.x-bullet.worldPosition.x)*bullet['velocity']
        #     bullet.worldLinearVelocity.y= (target.worldPosition.y-bullet.worldPosition.y)*bullet['velocity']
        #     bullet.worldLinearVelocity.z = (target.worldPosition.z+0.1-bullet.worldPosition.z)*bullet['velocity']

        # Sounds
        if obj['cat']=="Archer tower":
            audiodev.play(sndbuff_archer)
        if obj['cat']=="Mage tower":
            audiodev.play(sndbuff_mage)

        # Ligne (drawLine) (vitesse rapide)
        # if scene.objects['Terrain']['speed']>=1:
        if scene.objects['Terrain']['speed']<10: # Pas d'animation à 10 -> plantage

            # Archer (tir de flêche)
            if obj['cat']=="Archer tower":
                if target.name in scene.objects:
                    scene.objects['Terrain']['draw_process']=True
                    scene.objects['Terrain']['draw_list'].append([5, "arrow", [obj.worldPosition.x, obj.worldPosition.y, obj.worldPosition.z+0.8],target.name, angle3, ray_black, 5])

            # Cast zone
            if obj['cat']=="Mage tower": # Mage (cast)
                scene.objects['Terrain']['draw_process']=True
                scene.objects['Terrain']['draw_list'].append([30, "cast", [obj.worldPosition.x, obj.worldPosition.y, obj.worldPosition.z+0.8],ray_blue,30])

            # Rayon
            if obj['cat']=="Test":
                if target.name in scene.objects:
                    scene.objects['Terrain']['draw_process']=True
                    scene.objects['Terrain']['draw_list'].append([5, "ray", [obj.worldPosition.x, obj.worldPosition.y, obj.worldPosition.z+0.8], target.name, angle3, ray_yellow,5]) # Suivi du minion

        # Dégats
        target['hp'] =  target['hp'] - obj['damage']
        if target['hp']<=0:
            target['dead']=True

        # Cast (buff and debuff)
        if obj['cat']=="Mage tower":
            for target_i in sensor.hitObjectList:
                target_i['buff'].append([obj['cast'], obj['cast_duration']])

###############################################################################    
# Carte 
###############################################################################

# Fin
def ct_map_end(x,y):
    mapend= scene.addObject("Map_end", scene.objects['Terrain'])
    mapend.worldPosition=[x,y,0.2]
    mapend.worldScale=[0.25,0.25,0.25]

# Minion arrivé à la fin
def scn_map_end_near(cont):
    obj = cont.owner
    sensor = obj.sensors['Near']
    for i in range (len(sensor.hitObjectList)) :
        sensor.hitObjectList[i].endObject()
        audiodev.play(sndbuff_life)
        if scene.objects['Points']['lifes']>0:
            scene.objects['Points']['lifes']= scene.objects['Points']['lifes']-sensor.hitObjectList[0]['lifes_damage']
        scene.objects['Points']['minions_run'] -=1

# Drapeau de fin 
def ct_map_endflag(x,y):
    endflag= scene.addObject("Map_endflag", scene.objects['Terrain'])
    endflag.worldPosition=[x,y,0.3]
    endflag.worldScale=[0.3,0.3,0.3]
    if round(x) ==  x :
        if round(y) == y :
            scene.objects['Terrain']['scene_tile_noncontruct'].append([x,y])
        else:
            scene.objects['Terrain']['scene_tile_noncontruct'].append([x,math.floor(y)])
            scene.objects['Terrain']['scene_tile_noncontruct'].append([x,math.ceil(y)])
    else:
        if round(y) == y :
            scene.objects['Terrain']['scene_tile_noncontruct'].append([math.floor(x),y])
            scene.objects['Terrain']['scene_tile_noncontruct'].append([math.ceil(x),y])
        else:
            scene.objects['Terrain']['scene_tile_noncontruct'].append([math.floor(x),math.floor(y)])
            scene.objects['Terrain']['scene_tile_noncontruct'].append([math.floor(x),math.ceil(y)])
            scene.objects['Terrain']['scene_tile_noncontruct'].append([math.ceil(x),math.floor(y)])
            scene.objects['Terrain']['scene_tile_noncontruct'].append([math.ceil(x),math.ceil(y)])

###############################################################################    
# Temporisation
###############################################################################

def ct_sleep (duration):
    time.sleep(duration*(1/scene.objects['Terrain']['speed']))

# def ct_tempo (duration):
#     scene.objects['Terrain']['delay_cmd']=0
#     while scene.objects['Terrain']['delay_cmd']<duration*(1/scene.objects['Terrain']['speed']):
#         # print("Temporization commands :",scene.objects['Terrain']['delay_cmd'])
#         time.sleep(0.001)
#         # pass

# def ct_tempo_wave (duration):
#     scene.objects['Terrain']['delay_wave']=0
#     while scene.objects['Terrain']['delay_wave']<duration*(1/scene.objects['Terrain']['speed']):
#         # print("Temporization waves :",scene.objects['Terrain']['delay_wave'])
#         time.sleep(0.001)
#         # pass

# def ct_tempo_wave_trigger (duree):
#     print ("delay wave ", scene.objects['Terrain']['delay_wave'])

###############################################################################    
# Affichage
###############################################################################

# Texte du panel d'information
def ct_print (text):
    # text_info (texte)
    if text=="":
        scene.objects['Text_info-1'].setVisible(False,False)
        scene.objects['Text_info-2'].setVisible(False,False)
    else:
        lines_txt=texte.split("\n", 6)
        for i in range (len(lines_txt),6):
            lines_txt.append("") 
        scene.objects['Text_info-1'].setVisible(True,False)
        scene.objects['Text_info-2'].setVisible(True,False)
        scene.objects['Text_info-1']['Text']=lines_txt[0]+"\n"+lines_txt[1]+"\n"+lines_txt[2]
        scene.objects['Text_info-2']['Text']=lines_txt[3]+"\n"+lines_txt[4]+"\n"+lines_txt[5]

# Texte de carte
def ct_map_text(text):
    scene.objects['Map_text']['Text']=text
    scene.objects['Map_text'].setVisible(True,False)

###############################################################################    
# Dessin bas niveau (bge.render.drawLine)
###############################################################################

def  circle (center, radius, color):
    ang = 0.0
    # ang_step = 0.1
    ang_step = 0.2
    while ang< 2 * math.pi:
        x0 = center[0]+float(radius*math.cos(ang))
        y0 = center[1]+float(radius*math.sin(ang))
        x1 = center[0]+float(radius*math.cos(ang+ang_step))
        y1 = center[1]+float(radius*math.sin(ang+ang_step))
        bge.render.drawLine([x0,y0,center[2]],[x1,y1,center[2]],color)
        ang += ang_step

# Affiche les draws en cours
# FIXME: tir sur le plus avancé
#
# Type de draw : 
# arrow : [5, "arrow", [obj.worldPosition.x, obj.worldPosition.y, obj.worldPosition.z+0.8],target.name, angle3, ray_yellow,5]
# cast : [30, "cast", [obj.worldPosition.x, obj.worldPosition.y, obj.worldPosition.z+0.8], ray_blue,30]
# ray : [5, "ray", [obj.worldPosition.x, obj.worldPosition.y, obj.worldPosition.z+0.8],[target.worldPosition.x, target.worldPosition.y, target.worldPosition.z], angle3, ray_yellow,5]
#
def scn_draw(cont):
    obj = cont.owner
    if obj.sensors['Draw'].positive==False:
        return
    if len(scene.objects['Terrain']['draw_list'])==0:
        scene.objects['Terrain']['draw_process']=False
        return
   
    # Dépilage des draws à executer
    for draw_cmd in scene.objects['Terrain']['draw_list']:

        # Archer (tir de flêche)
        if draw_cmd[1]=="arrow": 
            if draw_cmd[3] in scene.objects:
                # x0 = draw_cmd[2][0]+0.25*(math.cos(draw_cmd[4]))
                # y0 = draw_cmd[2][1]+0.25*(math.sin(draw_cmd[4]))
                x0 = draw_cmd[2][0]
                y0 = draw_cmd[2][1]
                z0 = draw_cmd[2][2]
                x1 = scene.objects[draw_cmd[3]].worldPosition.x
                y1 = scene.objects[draw_cmd[3]].worldPosition.y
                z1 = scene.objects[draw_cmd[3]].worldPosition.z-0.1 # ajustement -0.1
                distance = math.sqrt((x1-x0)**2+(y1-y0)**2+(z1-z0)**2)
                distance_xy = math.sqrt((x1-x0)**2+(y1-y0)**2)
                distance_z = z1-z0
                angle_z =math.atan((z1-z0)/(distance_xy))
                angle_xy =math.atan((y1-y0)/(x1-x0))
                step=distance_xy/(2+draw_cmd[6])
                step_z=distance_z/(2+draw_cmd[6])
                if x1>x0:
                    angle2=angle_xy
                else:
                    angle2=math.pi+angle_xy
                x2=x0+(((6-draw_cmd[0])*step)*(math.cos(angle2)))
                y2=y0+(((6-draw_cmd[0])*step)*(math.sin(angle2)))
                z2=z0-(((6-draw_cmd[0])*step_z)*(math.sin(angle_z)))
                x3=x0+(((6-draw_cmd[0])*step+step)*(math.cos(angle2)))
                y3=y0+(((6-draw_cmd[0])*step+step)*(math.sin(angle2)))
                z3=z0-(((6-draw_cmd[0])*step_z+step_z)*(math.sin(angle_z)))
                bge.render.drawLine([x2,y2, z2], [x3,y3,z3],  draw_cmd[5])
                draw_cmd[0] = draw_cmd[0]-scene.objects['Terrain']['speed']
                # if scene.objects['Terrain']['speed']<1:
                #     draw_cmd[0] = draw_cmd[0]-scene.objects['Terrain']['speed']
                # else:
                #     draw_cmd[0] = draw_cmd[0]-1
                # bge.render.drawLine([draw_cmd[2][0]+((6-draw_cmd[0])*0.25)*(math.cos(draw_cmd[4])), draw_cmd[2][1]+((6-draw_cmd[0])*0.25)*(math.sin(draw_cmd[4])),draw_cmd[2][2]],
                #                     [draw_cmd[2][0]+((6-draw_cmd[0])*0.25+0.25)*(math.cos(draw_cmd[4])), draw_cmd[2][1]+((6-draw_cmd[0])*0.25+0.25)*(math.sin(draw_cmd[4])),draw_cmd[2][2]],
                #                     draw_cmd[5])

        # Mage (cast)
        # FIXME : Problème
        if draw_cmd[1]=="cast": # Mage (cast)
            circle(draw_cmd[2], 3.1-draw_cmd[0]*0.1, draw_cmd[3])
            circle(draw_cmd[2], 3-draw_cmd[0]*0.1, draw_cmd[3])
            circle(draw_cmd[2], 2.9-draw_cmd[0]*0.1, draw_cmd[3])
            draw_cmd[0] = draw_cmd[0]-scene.objects['Terrain']['speed']
            # if scene.objects['Terrain']['speed']<=2:
            #     draw_cmd[0] = draw_cmd[0]-scene.objects['Terrain']['speed']
            # if scene.objects['Terrain']['speed']==4:
            #     draw_cmd[0] = draw_cmd[0]-draw_cmd[4]/2
            # circle(draw_cmd[2], 3, draw_cmd[3]) # simple
            # radius=[3,3,2.5,2.5,2,2,1.5,1.5,1,1,1] # basé sur un tableau
            # circle(draw_cmd[2], radius[draw_cmd[0]], draw_cmd[3])

        # Rayon
        if draw_cmd[1]=="ray":
            if draw_cmd[3] in scene.objects:
                x0 = draw_cmd[2][0]+0.25*(math.cos(draw_cmd[4]))
                y0 = draw_cmd[2][1]+0.25*(math.sin(draw_cmd[4]))
                x1 = scene.objects[draw_cmd[3]].worldPosition.x
                y1 = scene.objects[draw_cmd[3]].worldPosition.y
                z1 = scene.objects[draw_cmd[3]].worldPosition.z
                bge.render.drawLine([x0,y0, draw_cmd[2][2]], [x1,y1,z1],  draw_cmd[5]) # suivi minion
                # bge.render.drawLine([draw_cmd[2][0]+0.25*(math.cos(draw_cmd[4])), draw_cmd[2][1]+0.25*(math.sin(draw_cmd[4])), draw_cmd[2][2]], draw_cmd[3],  draw_cmd[5]) # décalage minion
                # bge.render.drawLine(draw_cmd[2], draw_cmd[3],  draw_cmd[5]) # simple
                draw_cmd[0] = draw_cmd[0]-scene.objects['Terrain']['speed']

    # Suppression des draws finis
    i=0
    for draw_cmd in scene.objects['Terrain']['draw_list']:
        if draw_cmd[0]<=0:
            scene.objects['Terrain']['draw_list'].pop(i)
        else:
            i=i+1
    if len(scene.objects['Terrain']['draw_list'])==0:
        scene.objects['Terrain']['draw_process']=False