from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.relativelayout import RelativeLayout
from kivy.properties import NumericProperty, ReferenceListProperty
from kivy.event import EventDispatcher

from kivy.uix.button import Button
from kivy.uix.behaviors import ButtonBehavior
from kivy.uix.image import Image
from kivy.uix.effectwidget import PushMatrix,PopMatrix
from kivy.graphics import Rotate

class SparseGridLayout(FloatLayout):

    rows = NumericProperty(1)
    columns = NumericProperty(1)
    shape = ReferenceListProperty(rows, columns)
    layout_built = False
    def do_layout(self, *args):
        shape_hint = (1. / self.columns, 1. / self.rows) 
        if self.layout_built is False:
            for childLayout in self.children:
                for child in childLayout.children:
                    child.size_hint = (shape_hint[0] * child.hor_span, shape_hint[1] * child.vert_span)#TODO integrate span here
                    if not hasattr(child, 'row'):
                        child.row = 0
                    if not hasattr(child, 'column'):
                        child.column = 0
                    #evtl hier clickdispatch einbauen
                    #TODO: testen warum bei Rotate hitbox nicht mitrotiert wird
                    child.pos_hint = {'x': shape_hint[0] * child.row +(shape_hint[0]*0.5),
                                      'y': shape_hint[1] * child.column + (shape_hint[1]*0.5)}
                    #child.canvas.before.add(PushMatrix())
                    #child.canvas.before.add(Rotate(angle = 45,origin = [child.get_center_x(), child.get_center_y()] ))#
                    #child.canvas.after.add(PopMatrix())
            self.layout_built = True
        super(SparseGridLayout, self).do_layout(*args)

class GridEntry(EventDispatcher):
    row = NumericProperty(0)
    column = NumericProperty(0)
    vert_span = NumericProperty(1)
    hor_span = NumericProperty(1)

    def check_click():
        #TODO in click dispatching reinlesen
        #scheinbar wird click von sparsegrid nicht an kinder weitergegeben
        pass

class GridImage(ButtonBehavior,Image,GridEntry):
    id = None
    def __init__(self,id=None,**kwargs):
        self.id = id
        super(GridImage,self).__init__(**kwargs)

    def on_release(self):
        print("pos_pressed: {}".format(self.id))
        return super().on_release()

class ExampleApp(App):
    def build(self):        
        rlayout1 = RelativeLayout()
        rlayout2 = RelativeLayout()
        rlayout3 = RelativeLayout()
        rlayout4 = RelativeLayout()
        buttons = [] 
        gi1 = GridImage(id=1,row=1, column=2,vert_span=2,source='Assets/Formations/Formation_Card_1_90.png')
        gi1.size = gi1.texture_size        
        rlayout1.add_widget(gi1)
        buttons.append(rlayout1)
        gi2 = GridImage(id=2,row=2, column=1,vert_span=2,source='Assets/Formations/Formation_Card_2_90.png')
        gi2.size = gi2.texture_size
        rlayout2.add_widget(gi2)
        buttons.append(rlayout2)
        gi3 =GridImage(id=3,row=1, column=0,source='Assets/Formations/Formation_Card_3.png')
        gi3.size = gi3.texture_size
        rlayout3.add_widget(gi3)
        buttons.append(rlayout3)
        gi4 = GridImage(id=4,row=0, column=1,source='Assets/Formations/Formation_Card_4.png')
        gi4.size = gi4.texture_size
        rlayout4.add_widget(gi4)
        buttons.append(rlayout4)
        layout = SparseGridLayout(rows=3, columns=3)
        for button in buttons:
            layout.add_widget(button)
        #layout.add_widget(layout)
        return layout

if __name__ == "__main__":
    ExampleApp().run()