# rocket launcher

name = 'rocketlauncher'
type = 'gif'

from basegroundobj import *
import objrocket

ROCKET_OFFSET_X = 19
ROCKET_OFFSET_Y = 23

LAUNCH_PERCENT = -0.3
DEATH_POINT = -game.arena.width * 0.25

MOVE_INTERVAL = 10 # ticks

images = []

def load_game_resources():
    global image, name
    for loop in range(0,6):
        images.append(gfx.load('%s%d.%s' % (name,loop,type)))


class RocketLauncher(GroundObj):
    """launch_percent = -1.0 to 1.0   - distance to player before rocket launches.
           distance is expressed as % of screen width, negative means past player,
           positive means before player

    """

    # Class variables
    max = 3
    count = 0

    def __init__(self,airobjectlist,exhaustobj,launch_percent=LAUNCH_PERCENT, *extra_rocket_params):
        global name,images
        self.images = images
        self.imagenum = 0
        self.numimages = len(self.images)
        GroundObj.__init__(self,name,self.images[self.imagenum])
        self.airobjectlist = airobjectlist
        self.exhaustobj = exhaustobj
        self.rocket_offset_x = ROCKET_OFFSET_X 
        self.rocket_offset_y = ROCKET_OFFSET_Y 

        self.launch_dist = game.arena.width * launch_percent

        self.death_point = DEATH_POINT

        #print "extra rocket params:",extra_rocket_params
        self.extra_rocket_params = extra_rocket_params

        self.timer = 0
        self.launched = 0


    def tick(self, speedadjust):
        self.x += self.dx * speedadjust
        if self.x < self.death_point:
            self.dead = 1
        self.rect.topleft = [self.x,self.y] 
        self.target()
        if self.launched == 0:
            if self.target() == 1:
                self.timer += 1
                if self.timer % MOVE_INTERVAL == 0:
                    self.imagenum += 1
                    if self.imagenum >= self.numimages-1:
                        self.imagenum = self.numimages-1
                        self.launch()
                    self.image = self.images[self.imagenum]
        

    def target(self):
        if (self.launched == 0) and (game.player.dead == 0):
            if (((self.launch_dist >= 0) and
                 (self.x > game.player.x) and
                 (abs(self.x - game.player.x) <= abs(self.launch_dist))) or
                ((self.launch_dist < 0) and
                 (self.x < game.player.x) and
                 (abs(self.x - game.player.x) > abs(self.launch_dist)))):
                return 1
        else:
            return 0

    def launch(self):
        self.launched = 1
        self.pointvalue = 5
        
        self.airobjectlist.append(apply(objrocket.Rocket,
                                        (self.x+self.rocket_offset_x,self.y+self.rocket_offset_y,
                                         self.exhaustobj) + self.extra_rocket_params))