# ----------------------------------------------------------------------------
# cocos2d
# Copyright (c) 2008-2012 Daniel Moisset, Ricardo Quesada, Rayentray Tappa,
# Lucio Torre
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# ----------------------------------------------------------------------------
"""Batch

Batches
=======

Batches allow you to optimize the number of gl calls using pyglets batch

"""

__docformat__ = 'restructuredtext'

import cocosnode
from batch import *

import pyglet
from pyglet.graphics import OrderedGroup
from pyglet import image
from pyglet.gl import *

__all__ = ['BatchNode','BatchableNode']


def ensure_batcheable(node):
    if not isinstance(node, BatchableNode):
        raise Exception("Children node of a batch must be of class BatchableNode")
    for c in  node.get_children():
        ensure_batcheable(c)

class BatchNode( cocosnode.CocosNode ):
    def __init__(self):
        super(BatchNode, self).__init__()
        self.batch = pyglet.graphics.Batch()
        self.groups = {}

    def add(self, child, z=0, name=None):
        ensure_batcheable(child)
        child.set_batch(self.batch, self.groups, z)
        super(BatchNode, self).add(child, z, name)

    def visit(self):
        """ All children are placed in to self.batch, so nothing to visit """
        if not self.visible:   
           return 
        glPushMatrix()
        self.transform()
        self.batch.draw()
        glPopMatrix()

    def remove(self, child):
        if isinstance(child, str):
            child_node = self.get(child)
        else:
            child_node = child
        child_node.set_batch(None)
        super(BatchNode, self).remove(child)

    def draw(self):
        pass # All drawing done in visit!

class BatchableNode( cocosnode.CocosNode ):
    def add(self, child, z=0, name=None):
        batchnode = self.get_ancestor(BatchNode)
        if not batchnode:
            # this node was addded, but theres no batchnode in the
            # hierarchy. so we proceed as normal
            super(BatchableNode, self).add(child, z, name)
            return

        ensure_batcheable(child)
        super(BatchableNode, self).add(child, z, name)
        child.set_batch(self.batch, batchnode.groups, z)


    def remove(self, child):
        if isinstance(child, str):
            child_node = self.get(child)
        else:
            child_node = child
        child_node.set_batch(None)
        super(BatchableNode, self).remove(child)

    def set_batch(self, batch, groups=None, z=0):
        self.batch = batch
        if batch is None:
            self.group = None
        else:
            group = groups.get(z)
            if group is None:
                group = pyglet.graphics.Group()
                groups[z] = group
            self.group = group
        for childZ, child in self.children:
            child.set_batch(self.batch, groups, z + childZ)

