# Copyright (c) 2018 Ultimaker B.V.
# Cura is released under the terms of the LGPLv3 or higher.

import os

from PyQt5.QtCore import QObject, pyqtSlot, pyqtSignal, pyqtProperty

from UM.Application import Application
from UM.Extension import Extension
from UM.Logger import Logger
from UM.Message import Message
from UM.i18n import i18nCatalog
from UM.PluginRegistry import PluginRegistry
from UM.Scene.Iterator.DepthFirstIterator import DepthFirstIterator

catalog = i18nCatalog("cura")


SHRINKAGE_THRESHOLD = 0.5 #From what shrinkage percentage a warning will be issued about the model size.
WARNING_SIZE_XY = 150 #The horizontal size of a model that would be too large when dealing with shrinking materials.
WARNING_SIZE_Z = 100 #The vertical size of a model that would be too large when dealing with shrinking materials.


class ModelChecker(QObject, Extension):
    ##  Signal that gets emitted when anything changed that we need to check.
    onChanged = pyqtSignal()

    def __init__(self):
        super().__init__()

        self._button_view = None
        self._has_warnings = False

        self._caution_message = Message("", #Message text gets set when the message gets shown, to display the models in question.
            lifetime = 0,
            title = catalog.i18nc("@info:title", "Model Checker Warning"))

        Application.getInstance().initializationFinished.connect(self._pluginsInitialized)
        Application.getInstance().getController().getScene().sceneChanged.connect(self._onChanged)

    ##  Pass-through to allow UM.Signal to connect with a pyqtSignal.
    def _onChanged(self, _):
        self.onChanged.emit()

    ##  Called when plug-ins are initialized.
    #
    #   This makes sure that we listen to changes of the material and that the
    #   button is created that indicates warnings with the current set-up.
    def _pluginsInitialized(self):
        Application.getInstance().getMachineManager().rootMaterialChanged.connect(self.onChanged)
        self._createView()

    def checkObjectsForShrinkage(self):
        material_shrinkage = self.getMaterialShrinkage()

        warning_nodes = []

        # Check node material shrinkage and bounding box size
        for node in self.sliceableNodes():
            node_extruder_position = node.callDecoration("getActiveExtruderPosition")
            if material_shrinkage[node_extruder_position] > SHRINKAGE_THRESHOLD:
                bbox = node.getBoundingBox()
                if bbox.width >= WARNING_SIZE_XY or bbox.depth >= WARNING_SIZE_XY or bbox.height >= WARNING_SIZE_Z:
                    warning_nodes.append(node)

        return warning_nodes

    def sliceableNodes(self):
        # Add all sliceable scene nodes to check
        scene = Application.getInstance().getController().getScene()
        for node in DepthFirstIterator(scene.getRoot()):
            if node.callDecoration("isSliceable"):
                yield node

    ##  Creates the view used by show popup. The view is saved because of the fairly aggressive garbage collection.
    def _createView(self):
        Logger.log("d", "Creating model checker view.")

        # Create the plugin dialog component
        path = os.path.join(PluginRegistry.getInstance().getPluginPath("ModelChecker"), "ModelChecker.qml")
        self._button_view = Application.getInstance().createQmlComponent(path, {"manager": self})

        # The qml is only the button
        Application.getInstance().addAdditionalComponent("jobSpecsButton", self._button_view)

        Logger.log("d", "Model checker view created.")

    @pyqtProperty(bool, notify = onChanged)
    def runChecks(self):
        warning_nodes = self.checkObjectsForShrinkage()
        if warning_nodes:
            self._caution_message.setText(catalog.i18nc(
                "@info:status",
                "Some models may not be printed optimal due to object size and chosen material for models: {model_names}.\n"
                "Tips that may be useful to improve the print quality:\n"
                "1) Use rounded corners\n"
                "2) Turn the fan off (only if the are no tiny details on the model)\n"
                "3) Use a different material").format(model_names = ", ".join([n.getName() for n in warning_nodes])))
            return True
        else:
            return False

    @pyqtSlot()
    def showWarnings(self):
        if not self._button_view:
            self._createView()

        if self._has_warnings:
            self.self._caution_message.show()

    def getMaterialShrinkage(self):
        global_container_stack = Application.getInstance().getGlobalContainerStack()
        if global_container_stack is None:
            return {}

        material_shrinkage = {}
        # Get all shrinkage values of materials used
        for extruder_position, extruder in global_container_stack.extruders.items():
            shrinkage = extruder.material.getProperty("material_shrinkage_percentage", "value")
            if shrinkage is None:
                shrinkage = 0
            material_shrinkage[extruder_position] = shrinkage
        return material_shrinkage