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import random
import weakref


class TreeImage:
    def __init__(self, path, center, height):
        self.path = path
        self.center = center
        self.height = height

TreePart = enum(BASE=1, TRUNK=2, CROWN=3, SAPLING=4)
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class TreeSprite:
    def __init__(self, part, index):
        self.index = index
        self.part = part
        self.sprite = Sprite()

class Tree(object):
    bases = []
    trunks = []
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    crowns = []
    saplings = []
    #Path to the seed content script
    seed = ""
    #The range of the number of seeds that will drop from the crown
    seedRange = (1, 3)
    wood = "mods/base/item/raw/wood.ce"
    growthTimeMin = 10000#60 * 1000 #1 minute
    growthTimeMax = 10000#5 * 60 * 1000 #5 minutes
    #How much time it takes to recover from a hit
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    recoveryTime = 10000
    #How much life each part of the tree has - how many hits it can take
    partLife = 3
    trunkRange = (2, 6)

    def __init__(self, entity, organic):
        self.organic = organic

        #TODO: Is this reasonable to expect players to be network aware?
        if not Game.get().network.isHost():
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            return

        entity.interactable.add("harvest", self.onHarvest)
        entity.interactable.add("removeSupport", self.onRemoveSupport)
        self.addGrowthTimer()

        #Start it off as a sapling
        self.stage = 0
        self.maxStage = random.randint(self.trunkRange[0], self.trunkRange[1])
        self.sprites = [TreeSprite(TreePart.SAPLING, random.randint(0, len(self.saplings) - 1))]
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        self.construct()

    def addGrowthTimer(self):
        Game.get().timer.add(random.randint(self.growthTimeMin, self.growthTimeMax), self.grow)

    def grow(self):
        if self.stage == -1:
            return
        self.stage += 1

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        if self.stage is 1:
            #Clear out the sapling and append the tree base and crown
            self.sprites = []
            if self.bases:
                self.sprites.append(TreeSprite(TreePart.BASE, random.randint(0, len(self.bases) -1)))
            if self.crowns:
                self.sprites.append(TreeSprite(TreePart.CROWN, random.randint(0, len(self.crowns) -1)))
        if self.stage >= 1:
            trunk = TreeSprite(TreePart.TRUNK, random.randint(0, len(self.trunks) - 1))
            if self.crowns:
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                self.sprites.insert(-1, trunk)
            else:
                self.sprites.append(trunk)

        self.construct()
        if self.stage is not self.maxStage:
            self.addGrowthTimer()

    def getImage(self, sprite):
        if sprite.part is TreePart.BASE:
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            return self.bases[sprite.index]
        elif sprite.part is TreePart.TRUNK:
            return self.trunks[sprite.index]
        elif sprite.part is TreePart.CROWN:
            return self.crowns[sprite.index]
        elif sprite.part is TreePart.SAPLING:
            return self.saplings[sprite.index]
        else:
            raise ValueError("TreeSprite contains unknown tree part: ", sprite.part)

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    def construct(self):
        print "Building the tree at stage:", self.stage
        height = 0
        sprites = []
        for sprite in self.sprites:
            image = self.getImage(sprite)
            height -= image.height
            sprite.sprite.position.x = -image.center
            sprite.sprite.position.y = height
            self.organic.setImage(image.path, sprite.sprite)
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            sprites.append(sprite.sprite)
        self.organic.onConstruct(sprites)

    def onHarvest(self, args):
        entity = args["entity"]
        sprite = entity.modularRender.getTopSprite(args["position"])
        index = 0
        for s in self.sprites:
            if s.sprite is sprite:
                break
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            index += 1

        game = Game.get()
        parent = self.organic.getParent()
        if not parent:
            print "Could not find parent entity for the plant."
            return

        damageId = "%d-%d" % (parent.id, index)
        if not game.damage(damageId, 1, self.partLife, self.recoveryTime):
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            #return if we haven't done enough damage to the targeted tree part
            return

        #ignore if at the top of the tree
        if index == len(self.sprites):
            return

        self.destroyAtIndex(index)


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    def destroyAtIndex(self, index):
        #Create the dropped items in the world
        game = Game.get()
        woodId = game.mod.getContent(self.wood).id
        for s in self.sprites[index:]:
            image = self.getImage(s)
            centerY = image.height / 2
            position = s.sprite.getPosition()
            position.x += image.center
            position.y += centerY
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            woodPosition = position
            woodPosition.x += random.randint(-image.center, image.center)
            woodPosition.y += random.randint(-centerY, -centerY)
            print "Creating dropped wood at position (%d, %d)" % (woodPosition.x, woodPosition.y)
            game.dropped.create(woodId, 1, woodPosition, Vectorf(0, 8))

            if s.part is TreePart.CROWN and self.seed:
                seedId = game.mod.getContent(self.seed).id
                for x in xrange(0, random.randint(self.seedRange[0], self.seedRange[1])):
                    seedPosition = position
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                    seedPosition.x += random.randint(-image.center, image.center)
                    seedPosition.y += random.randint(-centerY, centerY)
                    print "Creating dropped seed at position (%d, %d)" % (seedPosition.x, seedPosition.y)
                    game.dropped.create(seedId, 1, seedPosition, Vectorf(0, 8))

        #remove the targeted sprite and all of the sprites above it
        self.sprites = self.sprites[:index]

        if self.sprites:
            #Reconstruct the graphics for the tree
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            self.organic.onConstruct([sprite.sprite for sprite in self.sprites])
            #Set the stage to -1 signifying that it cannot grow anymore
            self.stage = -1
        else:
            #The entire tree was destroyed. Destroy the entity.
            parent = self.organic.getParent()
            if parent:
                parent.destroy()

    def onRemoveSupport(self, args):
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        #First check to see if the base (or bottom trunk) is actually over the tile being changed
        sprite = self.sprites[0]
        spriteArea = sprite.sprite.getRect()
        if not spriteArea.intersects(args["area"]):
            #No overlap so this is a false alarm
            return

        if args["forced"]:
            #The support is being forcefully removed. Destroy the entire tree
            self.destroyAtIndex(0)
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        else:
            #Cancel the request
            args["canceled"] = True

    def save_bad(self, stream):
        import pdb
        pdb.set_trace()
        stream << self.stage
        stream << len(self.sprites)
        for sprite in self.sprites:
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            stream << self.part
            stream << self.index

    def load_bad(self, stream):
        stream >> self.stage
        spriteCount = 0
        stream >> spriteCount
        self.sprites = []
        for x in xrange(0, spriteCount):
            part = 0
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            index = 0
            stream >> part
            stream >> index
            self.sprites.append(TreeSprite(part, index))
        self.construct()

    def pack_bad(self, packet):
        self.save(packet)

    def unpack_bad(self, packet):
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        self.load(packet)

def useSeed(plant, args):
    #First calculate the position of the new tree and see if it is ok
    position = args["position"]
    ground = World.get().layer["ground"]

    #If the tile clicked on is solid as well as the tile above it then do not allow seed planting
    tilePos = ground.getTilePosition(position)
    if ground.getTile(tilePos) is not 0 and ground.getTile(Vector(tilePos.x, tilePos.y + 1)):
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        return

    tilePos = ground.getTileInDirection(position, Vector(0, 1))
    verticalPos = tilePos.y * TileSystem.TILE_SIZE
    if verticalPos > (position.y + 2 * TileSystem.TILE_SIZE):
        return
    position.y = verticalPos

    game = Game.get()
    contentId = game.mod.getContent(plant).id
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    tree = game.entity.create(contentId, True)

    tree.modularRender.setPosition(position)
    print "Created new tree at (%d, %d)" % (position.x, position.y)
    World.get().layer["active"].add(tree)
    args['decrement'] = 1
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