from UM.Scene.SceneNode import SceneNode
from UM.Resources import Resources
from UM.Math.Color import Color
from UM.Math.Vector import Vector
from UM.Mesh.MeshData import MeshData

import numpy

class ConvexHullNode(SceneNode):
    def __init__(self, node, hull, parent = None):
        super().__init__(parent)

        self.setCalculateBoundingBox(False)

        self._material = None

        self._original_parent = parent

        self._inherit_orientation = False
        self._inherit_scale = False

        self._node = node
        self._node.transformationChanged.connect(self._onNodePositionChanged)
        self._node.parentChanged.connect(self._onNodeParentChanged)
        #self._onNodePositionChanged(self._node)

        self._hull = hull

        hull_points = self._hull.getPoints()
        center = (hull_points.min(0) + hull_points.max(0)) / 2.0

        mesh = MeshData()
        mesh.addVertex(center[0], 0.1, center[1])

        for point in hull_points:
            mesh.addVertex(point[0], 0.1, point[1])

        indices = []
        for i in range(len(hull_points) - 1):
            indices.append([0, i + 1, i + 2])

        indices.append([0, mesh.getVertexCount() - 1, 1])

        mesh.addIndices(numpy.array(indices, numpy.int32))

        self.setMeshData(mesh)

    def render(self, renderer):
        if not self._material:
            self._material = renderer.createMaterial(Resources.getPath(Resources.ShadersLocation, 'basic.vert'), Resources.getPath(Resources.ShadersLocation, 'color.frag'))

            self._material.setUniformValue('u_color', Color(35, 35, 35, 128))

        renderer.queueNode(self, material = self._material, transparent = True)

        return True

    def _onNodePositionChanged(self, node):
        #self.setPosition(node.getWorldPosition())
        if hasattr(node, "_convex_hull"):
            delattr(node, "_convex_hull")
            self.setParent(None)


        #self._node.transformationChanged.disconnect(self._onNodePositionChanged)
        #self._node.parentChanged.disconnect(self._onNodeParentChanged)

    def _onNodeParentChanged(self, node):
        if node.getParent():
            self.setParent(self._original_parent)
        else:
            self.setParent(None)