# 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, QTimer

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

catalog = i18nCatalog("cura")


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

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

        self._button_view = None

        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", "3D Model Assistant"))

        self._change_timer = QTimer()
        self._change_timer.setInterval(200)
        self._change_timer.setSingleShot(True)
        self._change_timer.timeout.connect(self.onChanged)

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

    def _onChanged(self, *args, **kwargs):
        # Ignore camera updates.
        if len(args) == 0:
            self._change_timer.start()
            return
        if not isinstance(args[0], Camera):
            self._change_timer.start()

    def _pluginsInitialized(self):
        """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.
        """

        Application.getInstance().getMachineManager().rootMaterialChanged.connect(self.onChanged)
        self._createView()

    def checkObjectsForShrinkage(self):
        shrinkage_threshold = 100.5 #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.

        # This function can be triggered in the middle of a machine change, so do not proceed if the machine change
        # has not done yet.
        global_container_stack = Application.getInstance().getGlobalContainerStack()
        if global_container_stack is None:
            return False

        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 node_extruder_position is None:
                continue

            # This function can be triggered in the middle of a machine change, so do not proceed if the machine change
            # has not done yet.
            try:
                global_container_stack.extruderList[int(node_extruder_position)]
            except IndexError:
                Application.getInstance().callLater(lambda: self.onChanged.emit())
                return False

            if material_shrinkage > shrinkage_threshold:
                bbox = node.getBoundingBox()
                if bbox is not None and (bbox.width >= warning_size_xy or bbox.depth >= warning_size_xy or bbox.height >= warning_size_z):
                    warning_nodes.append(node)

        self._caution_message.setText(catalog.i18nc(
            "@info:status",
            "<p>One or more 3D models may not print optimally due to the model size and material configuration:</p>\n"
            "<p>{model_names}</p>\n"
            "<p>Find out how to ensure the best possible print quality and reliability.</p>\n"
            "<p><a href=\"https://ultimaker.com/3D-model-assistant\">View print quality guide</a></p>"
            ).format(model_names = ", ".join([n.getName() for n in warning_nodes])))

        return len(warning_nodes) > 0

    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

    def _createView(self):
        """Creates the view used by show popup.

        The view is saved because of the fairly aggressive garbage collection.
        """

        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 hasWarnings(self):
        danger_shrinkage = self.checkObjectsForShrinkage()
        return any((danger_shrinkage, )) #If any of the checks fail, show the warning button.

    @pyqtSlot()
    def showWarnings(self):
        self._caution_message.show()

    def _getMaterialShrinkage(self) -> float:
        global_container_stack = Application.getInstance().getGlobalContainerStack()
        if global_container_stack is None:
            return 100
        return global_container_stack.getProperty("material_shrinkage_percentage", "value")
