# Copyright (c) 2017 Ultimaker B.V.
# Cura is released under the terms of the LGPLv3 or higher.

import numpy
from string import Formatter
from enum import IntEnum
import time

from UM.Job import Job
from UM.Application import Application
from UM.Logger import Logger

from UM.Scene.Iterator.DepthFirstIterator import DepthFirstIterator

from UM.Settings.Validator import ValidatorState
from UM.Settings.SettingRelation import RelationType

from cura.Scene.CuraSceneNode import CuraSceneNode
from cura.OneAtATimeIterator import OneAtATimeIterator
from cura.Settings.ExtruderManager import ExtruderManager


NON_PRINTING_MESH_SETTINGS = ["anti_overhang_mesh", "infill_mesh", "cutting_mesh"]


class StartJobResult(IntEnum):
    Finished = 1
    Error = 2
    SettingError = 3
    NothingToSlice = 4
    MaterialIncompatible = 5
    BuildPlateError = 6
    ObjectSettingError = 7 #When an error occurs in per-object settings.


##  Formatter class that handles token expansion in start/end gcod
class GcodeStartEndFormatter(Formatter):
    def get_value(self, key, args, kwargs):  # [CodeStyle: get_value is an overridden function from the Formatter class]
        # The kwargs dictionary contains a dictionary for each stack (with a string of the extruder_nr as their key),
        # and a default_extruder_nr to use when no extruder_nr is specified

        if isinstance(key, str):
            try:
                extruder_nr = kwargs["default_extruder_nr"]
            except ValueError:
                extruder_nr = -1

            key_fragments = [fragment.strip() for fragment in key.split(',')]
            if len(key_fragments) == 2:
                try:
                    extruder_nr = int(key_fragments[1])
                except ValueError:
                    try:
                        extruder_nr = int(kwargs["-1"][key_fragments[1]]) # get extruder_nr values from the global stack
                    except (KeyError, ValueError):
                        # either the key does not exist, or the value is not an int
                        Logger.log("w", "Unable to determine stack nr '%s' for key '%s' in start/end gcode, using global stack", key_fragments[1], key_fragments[0])
            elif len(key_fragments) != 1:
                Logger.log("w", "Incorrectly formatted placeholder '%s' in start/end gcode", key)
                return "{" + str(key) + "}"

            key = key_fragments[0]
            try:
                return kwargs[str(extruder_nr)][key]
            except KeyError:
                Logger.log("w", "Unable to replace '%s' placeholder in start/end gcode", key)
                return "{" + key + "}"
        else:
            Logger.log("w", "Incorrectly formatted placeholder '%s' in start/end gcode", key)
            return "{" + str(key) + "}"


##  Job class that builds up the message of scene data to send to CuraEngine.
class StartSliceJob(Job):
    def __init__(self, slice_message):
        super().__init__()

        self._scene = Application.getInstance().getController().getScene()
        self._slice_message = slice_message
        self._is_cancelled = False
        self._build_plate_number = None

        self._all_extruders_settings = None # cache for all setting values from all stacks (global & extruder) for the current machine

    def getSliceMessage(self):
        return self._slice_message

    def setBuildPlate(self, build_plate_number):
        self._build_plate_number = build_plate_number

    ##  Check if a stack has any errors.
    ##  returns true if it has errors, false otherwise.
    def _checkStackForErrors(self, stack):
        if stack is None:
            return False

        for key in stack.getAllKeys():
            validation_state = stack.getProperty(key, "validationState")
            if validation_state in (ValidatorState.Exception, ValidatorState.MaximumError, ValidatorState.MinimumError):
                Logger.log("w", "Setting %s is not valid, but %s. Aborting slicing.", key, validation_state)
                return True
            Job.yieldThread()
        return False

    ##  Runs the job that initiates the slicing.
    def run(self):
        if self._build_plate_number is None:
            self.setResult(StartJobResult.Error)
            return

        stack = Application.getInstance().getGlobalContainerStack()
        if not stack:
            self.setResult(StartJobResult.Error)
            return

        # Don't slice if there is a setting with an error value.
        if Application.getInstance().getMachineManager().stacksHaveErrors:
            self.setResult(StartJobResult.SettingError)
            return

        if Application.getInstance().getBuildVolume().hasErrors():
            self.setResult(StartJobResult.BuildPlateError)
            return

        for extruder_stack in ExtruderManager.getInstance().getMachineExtruders(stack.getId()):
            material = extruder_stack.findContainer({"type": "material"})
            if material:
                if material.getMetaDataEntry("compatible") == False:
                    self.setResult(StartJobResult.MaterialIncompatible)
                    return

        # Don't slice if there is a per object setting with an error value.
        for node in DepthFirstIterator(self._scene.getRoot()):
            if type(node) is not CuraSceneNode or not node.isSelectable():
                continue

            if self._checkStackForErrors(node.callDecoration("getStack")):
                self.setResult(StartJobResult.ObjectSettingError)
                return

        with self._scene.getSceneLock():
            # Remove old layer data.
            for node in DepthFirstIterator(self._scene.getRoot()):
                if node.callDecoration("getLayerData") and node.callDecoration("getBuildPlateNumber") == self._build_plate_number:
                    node.getParent().removeChild(node)
                    break

            # Get the objects in their groups to print.
            object_groups = []
            if stack.getProperty("print_sequence", "value") == "one_at_a_time":
                for node in OneAtATimeIterator(self._scene.getRoot()):
                    temp_list = []

                    # Node can't be printed, so don't bother sending it.
                    if getattr(node, "_outside_buildarea", False):
                        continue

                    # Filter on current build plate
                    build_plate_number = node.callDecoration("getBuildPlateNumber")
                    if build_plate_number is not None and build_plate_number != self._build_plate_number:
                        continue

                    children = node.getAllChildren()
                    children.append(node)
                    for child_node in children:
                        if type(child_node) is CuraSceneNode and child_node.getMeshData() and child_node.getMeshData().getVertices() is not None:
                            temp_list.append(child_node)

                    if temp_list:
                        object_groups.append(temp_list)
                    Job.yieldThread()
                if len(object_groups) == 0:
                    Logger.log("w", "No objects suitable for one at a time found, or no correct order found")
            else:
                temp_list = []
                has_printing_mesh = False
                for node in DepthFirstIterator(self._scene.getRoot()):
                    if node.callDecoration("isSliceable") and type(node) is CuraSceneNode and node.getMeshData() and node.getMeshData().getVertices() is not None:
                        per_object_stack = node.callDecoration("getStack")
                        is_non_printing_mesh = False
                        if per_object_stack:
                            is_non_printing_mesh = any(per_object_stack.getProperty(key, "value") for key in NON_PRINTING_MESH_SETTINGS)

                        if (node.callDecoration("getBuildPlateNumber") == self._build_plate_number):
                            if not getattr(node, "_outside_buildarea", False) or is_non_printing_mesh:
                                temp_list.append(node)
                                if not is_non_printing_mesh:
                                    has_printing_mesh = True

                    Job.yieldThread()

                #If the list doesn't have any model with suitable settings then clean the list
                # otherwise CuraEngine will crash
                if not has_printing_mesh:
                    temp_list.clear()

                if temp_list:
                    object_groups.append(temp_list)

            # There are cases when there is nothing to slice. This can happen due to one at a time slicing not being
            # able to find a possible sequence or because there are no objects on the build plate (or they are outside
            # the build volume)
            if not object_groups:
                self.setResult(StartJobResult.NothingToSlice)
                return

            self._buildGlobalSettingsMessage(stack)
            self._buildGlobalInheritsStackMessage(stack)

            # Build messages for extruder stacks
            for extruder_stack in ExtruderManager.getInstance().getMachineExtruders(stack.getId()):
                self._buildExtruderMessage(extruder_stack)

            for group in object_groups:
                group_message = self._slice_message.addRepeatedMessage("object_lists")
                if group[0].getParent().callDecoration("isGroup"):
                    self._handlePerObjectSettings(group[0].getParent(), group_message)
                for object in group:
                    mesh_data = object.getMeshData()
                    rot_scale = object.getWorldTransformation().getTransposed().getData()[0:3, 0:3]
                    translate = object.getWorldTransformation().getData()[:3, 3]

                    # This effectively performs a limited form of MeshData.getTransformed that ignores normals.
                    verts = mesh_data.getVertices()
                    verts = verts.dot(rot_scale)
                    verts += translate

                    # Convert from Y up axes to Z up axes. Equals a 90 degree rotation.
                    verts[:, [1, 2]] = verts[:, [2, 1]]
                    verts[:, 1] *= -1

                    obj = group_message.addRepeatedMessage("objects")
                    obj.id = id(object)

                    indices = mesh_data.getIndices()
                    if indices is not None:
                        flat_verts = numpy.take(verts, indices.flatten(), axis=0)
                    else:
                        flat_verts = numpy.array(verts)

                    obj.vertices = flat_verts

                    self._handlePerObjectSettings(object, obj)

                    Job.yieldThread()

        self.setResult(StartJobResult.Finished)

    def cancel(self):
        super().cancel()
        self._is_cancelled = True

    def isCancelled(self):
        return self._is_cancelled

    ##  Creates a dictionary of tokens to replace in g-code pieces.
    #
    #   This indicates what should be replaced in the start and end g-codes.
    #   \param stack The stack to get the settings from to replace the tokens
    #   with.
    #   \return A dictionary of replacement tokens to the values they should be
    #   replaced with.
    def _buildReplacementTokens(self, stack) -> dict:
        result = {}
        for key in stack.getAllKeys():
            result[key] = stack.getProperty(key, "value")
            Job.yieldThread()

        result["print_bed_temperature"] = result["material_bed_temperature"] # Renamed settings.
        result["print_temperature"] = result["material_print_temperature"]
        result["time"] = time.strftime("%H:%M:%S") #Some extra settings.
        result["date"] = time.strftime("%d-%m-%Y")
        result["day"] = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"][int(time.strftime("%w"))]

        initial_extruder_stack = Application.getInstance().getExtruderManager().getUsedExtruderStacks()[0]
        initial_extruder_nr = initial_extruder_stack.getProperty("extruder_nr", "value")
        result["initial_extruder_nr"] = initial_extruder_nr

        return result

    ##  Replace setting tokens in a piece of g-code.
    #   \param value A piece of g-code to replace tokens in.
    #   \param default_extruder_nr Stack nr to use when no stack nr is specified, defaults to the global stack
    def _expandGcodeTokens(self, value: str, default_extruder_nr: int = -1):
        if not self._all_extruders_settings:
            global_stack = Application.getInstance().getGlobalContainerStack()

            # NB: keys must be strings for the string formatter
            self._all_extruders_settings = {
                "-1": self._buildReplacementTokens(global_stack)
            }

            for extruder_stack in ExtruderManager.getInstance().getMachineExtruders(global_stack.getId()):
                extruder_nr = extruder_stack.getProperty("extruder_nr", "value")
                self._all_extruders_settings[str(extruder_nr)] = self._buildReplacementTokens(extruder_stack)

        try:
            # any setting can be used as a token
            fmt = GcodeStartEndFormatter()
            settings = self._all_extruders_settings.copy()
            settings["default_extruder_nr"] = default_extruder_nr
            return str(fmt.format(value, **settings))
        except:
            Logger.logException("w", "Unable to do token replacement on start/end gcode")
            return str(value)

    ##  Create extruder message from stack
    def _buildExtruderMessage(self, stack):
        message = self._slice_message.addRepeatedMessage("extruders")
        message.id = int(stack.getMetaDataEntry("position"))

        settings = self._buildReplacementTokens(stack)

        # Also send the material GUID. This is a setting in fdmprinter, but we have no interface for it.
        settings["material_guid"] = stack.material.getMetaDataEntry("GUID", "")

        # Replace the setting tokens in start and end g-code.
        extruder_nr = stack.getProperty("extruder_nr", "value")
        settings["machine_extruder_start_code"] = self._expandGcodeTokens(settings["machine_extruder_start_code"], extruder_nr)
        settings["machine_extruder_end_code"] = self._expandGcodeTokens(settings["machine_extruder_end_code"], extruder_nr)

        for key, value in settings.items():
            # Do not send settings that are not settable_per_extruder.
            if not stack.getProperty(key, "settable_per_extruder"):
                continue
            setting = message.getMessage("settings").addRepeatedMessage("settings")
            setting.name = key
            setting.value = str(value).encode("utf-8")
            Job.yieldThread()

    ##  Sends all global settings to the engine.
    #
    #   The settings are taken from the global stack. This does not include any
    #   per-extruder settings or per-object settings.
    def _buildGlobalSettingsMessage(self, stack):
        settings = self._buildReplacementTokens(stack)

        # Pre-compute material material_bed_temp_prepend and material_print_temp_prepend
        start_gcode = settings["machine_start_gcode"]
        bed_temperature_settings = {"material_bed_temperature", "material_bed_temperature_layer_0"}
        settings["material_bed_temp_prepend"] = all(("{" + setting + "}" not in start_gcode for setting in bed_temperature_settings))
        print_temperature_settings = {"material_print_temperature", "material_print_temperature_layer_0", "default_material_print_temperature", "material_initial_print_temperature", "material_final_print_temperature", "material_standby_temperature"}
        settings["material_print_temp_prepend"] = all(("{" + setting + "}" not in start_gcode for setting in print_temperature_settings))

        # Replace the setting tokens in start and end g-code.
        # Use values from the first used extruder by default so we get the expected temperatures
        initial_extruder_stack = Application.getInstance().getExtruderManager().getUsedExtruderStacks()[0]
        initial_extruder_nr = initial_extruder_stack.getProperty("extruder_nr", "value")

        settings["machine_start_gcode"] = self._expandGcodeTokens(settings["machine_start_gcode"], initial_extruder_nr)
        settings["machine_end_gcode"] = self._expandGcodeTokens(settings["machine_end_gcode"], initial_extruder_nr)

        # Add all sub-messages for each individual setting.
        for key, value in settings.items():
            setting_message = self._slice_message.getMessage("global_settings").addRepeatedMessage("settings")
            setting_message.name = key
            setting_message.value = str(value).encode("utf-8")
            Job.yieldThread()

    ##  Sends for some settings which extruder they should fallback to if not
    #   set.
    #
    #   This is only set for settings that have the limit_to_extruder
    #   property.
    #
    #   \param stack The global stack with all settings, from which to read the
    #   limit_to_extruder property.
    def _buildGlobalInheritsStackMessage(self, stack):
        for key in stack.getAllKeys():
            extruder = int(round(float(stack.getProperty(key, "limit_to_extruder"))))
            if extruder >= 0: #Set to a specific extruder.
                setting_extruder = self._slice_message.addRepeatedMessage("limit_to_extruder")
                setting_extruder.name = key
                setting_extruder.extruder = extruder
            Job.yieldThread()

    ##  Check if a node has per object settings and ensure that they are set correctly in the message
    #   \param node \type{SceneNode} Node to check.
    #   \param message object_lists message to put the per object settings in
    def _handlePerObjectSettings(self, node, message):
        stack = node.callDecoration("getStack")

        # Check if the node has a stack attached to it and the stack has any settings in the top container.
        if not stack:
            return

        # Check all settings for relations, so we can also calculate the correct values for dependent settings.
        top_of_stack = stack.getTop()  # Cache for efficiency.
        changed_setting_keys = set(top_of_stack.getAllKeys())

        # Add all relations to changed settings as well.
        for key in top_of_stack.getAllKeys():
            instance = top_of_stack.getInstance(key)
            self._addRelations(changed_setting_keys, instance.definition.relations)
            Job.yieldThread()

        # Ensure that the engine is aware what the build extruder is.
        if stack.getProperty("machine_extruder_count", "value") > 1:
            changed_setting_keys.add("extruder_nr")

        # Get values for all changed settings
        for key in changed_setting_keys:
            setting = message.addRepeatedMessage("settings")
            setting.name = key
            extruder = int(round(float(stack.getProperty(key, "limit_to_extruder"))))

            # Check if limited to a specific extruder, but not overridden by per-object settings.
            if extruder >= 0 and key not in changed_setting_keys:
                limited_stack = ExtruderManager.getInstance().getActiveExtruderStacks()[extruder]
            else:
                limited_stack = stack

            setting.value = str(limited_stack.getProperty(key, "value")).encode("utf-8")

            Job.yieldThread()

    ##  Recursive function to put all settings that require each other for value changes in a list
    #   \param relations_set \type{set} Set of keys (strings) of settings that are influenced
    #   \param relations list of relation objects that need to be checked.
    def _addRelations(self, relations_set, relations):
        for relation in filter(lambda r: r.role == "value" or r.role == "limit_to_extruder", relations):
            if relation.type == RelationType.RequiresTarget:
                continue

            relations_set.add(relation.target.key)
            self._addRelations(relations_set, relation.target.relations)

