# Copyright (c) 2019 Ultimaker B.V.
# Cura is released under the terms of the LGPLv3 or higher.

from typing import Optional, TYPE_CHECKING

from PyQt5.QtCore import pyqtProperty

import UM.i18n
from UM.FlameProfiler import pyqtSlot
from UM.Settings.ContainerRegistry import ContainerRegistry
from UM.Settings.DefinitionContainer import DefinitionContainer
from UM.Util import parseBool

import cura.CuraApplication  # Imported like this to prevent circular dependencies.
from cura.MachineAction import MachineAction
from cura.Machines.ContainerTree import ContainerTree  # To re-build the machine node when hasMaterials changes.
from cura.Settings.CuraStackBuilder import CuraStackBuilder
from cura.Settings.cura_empty_instance_containers import isEmptyContainer

if TYPE_CHECKING:
    from PyQt5.QtCore import QObject

catalog = UM.i18n.i18nCatalog("cura")


##  This action allows for certain settings that are "machine only") to be modified.
#   It automatically detects machine definitions that it knows how to change and attaches itself to those.
class MachineSettingsAction(MachineAction):
    def __init__(self, parent: Optional["QObject"] = None) -> None:
        super().__init__("MachineSettingsAction", catalog.i18nc("@action", "Machine Settings"))
        self._qml_url = "MachineSettingsAction.qml"

        from cura.CuraApplication import CuraApplication
        self._application = CuraApplication.getInstance()

        from cura.Settings.CuraContainerStack import _ContainerIndexes
        self._store_container_index = _ContainerIndexes.DefinitionChanges

        self._container_registry = ContainerRegistry.getInstance()
        self._container_registry.containerAdded.connect(self._onContainerAdded)

        # The machine settings dialog blocks auto-slicing when it's shown, and re-enables it when it's finished.
        self._backend = self._application.getBackend()
        self.onFinished.connect(self._onFinished)

        # If the g-code flavour changes between UltiGCode and another flavour, we need to update the container tree.
        self._application.globalContainerStackChanged.connect(self._updateHasMaterialsInContainerTree)

    # Which container index in a stack to store machine setting changes.
    @pyqtProperty(int, constant = True)
    def storeContainerIndex(self) -> int:
        return self._store_container_index

    def _onContainerAdded(self, container):
        # Add this action as a supported action to all machine definitions
        if isinstance(container, DefinitionContainer) and container.getMetaDataEntry("type") == "machine":
            self._application.getMachineActionManager().addSupportedAction(container.getId(), self.getKey())

    ##  Triggered when the global container stack changes or when the g-code
    #   flavour setting is changed.
    def _updateHasMaterialsInContainerTree(self) -> None:
        global_stack = cura.CuraApplication.CuraApplication.getInstance().getGlobalContainerStack()
        if global_stack is None:
            return
        machine_node = ContainerTree.getInstance().machines[global_stack.definition.getId()]

        if machine_node.has_materials != parseBool(global_stack.getMetaDataEntry("has_materials")):  # May have changed due to the g-code flavour.
            machine_node.has_materials = parseBool(global_stack.getMetaDataEntry("has_materials"))
            machine_node._loadAll()

    def _reset(self):
        global_stack = self._application.getMachineManager().activeMachine
        if not global_stack:
            return

        # Make sure there is a definition_changes container to store the machine settings
        definition_changes_id = global_stack.definitionChanges.getId()
        if isEmptyContainer(definition_changes_id):
            CuraStackBuilder.createDefinitionChangesContainer(global_stack,
                                                              global_stack.getName() + "_settings")

        # Disable auto-slicing while the MachineAction is showing
        if self._backend:  # This sometimes triggers before backend is loaded.
            self._backend.disableTimer()

    def _onFinished(self):
        # Restore auto-slicing when the machine action is dismissed
        if self._backend and self._backend.determineAutoSlicing():
            self._backend.enableTimer()
            self._backend.tickle()

    @pyqtSlot(int)
    def setMachineExtruderCount(self, extruder_count: int) -> None:
        # Note: this method was in this class before, but since it's quite generic and other plugins also need it
        # it was moved to the machine manager instead. Now this method just calls the machine manager.
        self._application.getMachineManager().setActiveMachineExtruderCount(extruder_count)

    @pyqtSlot()
    def forceUpdate(self) -> None:
        # Force rebuilding the build volume by reloading the global container stack.
        # This is a bit of a hack, but it seems quick enough.
        self._application.getMachineManager().globalContainerChanged.emit()

    @pyqtSlot()
    def updateHasMaterialsMetadata(self) -> None:
        global_stack = self._application.getMachineManager().activeMachine

        # Updates the has_materials metadata flag after switching gcode flavor
        if not global_stack:
            return

        definition = global_stack.getDefinition()
        if definition.getProperty("machine_gcode_flavor", "value") != "UltiGCode" or parseBool(definition.getMetaDataEntry("has_materials", False)):
            # In other words: only continue for the UM2 (extended), but not for the UM2+
            return

        machine_manager = self._application.getMachineManager()
        has_materials = global_stack.getProperty("machine_gcode_flavor", "value") != "UltiGCode"

        if has_materials:
            global_stack.setMetaDataEntry("has_materials", True)
        else:
            # The metadata entry is stored in an ini, and ini files are parsed as strings only.
            # Because any non-empty string evaluates to a boolean True, we have to remove the entry to make it False.
            if "has_materials" in global_stack.getMetaData():
                global_stack.removeMetaDataEntry("has_materials")

        self._updateHasMaterialsInContainerTree()

        # set materials
        machine_node = ContainerTree.getInstance().machines[global_stack.definition.getId()]
        for position, extruder in enumerate(global_stack.extruderList):
            #Find out what material we need to default to.
            approximate_diameter = round(extruder.getProperty("material_diameter", "value"))
            material_node = machine_node.variants[extruder.variant.getName()].preferredMaterial(approximate_diameter)
            machine_manager.setMaterial(str(position), material_node)

        self._application.globalContainerStackChanged.emit()

    @pyqtSlot(int)
    def updateMaterialForDiameter(self, extruder_position: int) -> None:
        # Updates the material container to a material that matches the material diameter set for the printer
        self._application.getMachineManager().updateMaterialWithVariant(str(extruder_position))