# Copyright (c) 2015 Jaime van Kessel
# Copyright (c) 2018 Ultimaker B.V.
# The PostProcessingPlugin is released under the terms of the AGPLv3 or higher.
from UM.Signal import Signal, signalemitter
from UM.i18n import i18nCatalog

# Setting stuff import
from UM.Application import Application
from UM.Settings.ContainerFormatError import ContainerFormatError
from UM.Settings.ContainerStack import ContainerStack
from UM.Settings.InstanceContainer import InstanceContainer
from UM.Settings.DefinitionContainer import DefinitionContainer
from UM.Settings.ContainerRegistry import ContainerRegistry

import re
import json
import collections
i18n_catalog = i18nCatalog("cura")


## Base class for scripts. All scripts should inherit the script class.
@signalemitter
class Script:
    def __init__(self):
        super().__init__()
        self._settings = None
        self._stack = None

        setting_data = self.getSettingData()
        self._stack = ContainerStack(stack_id = str(id(self)))
        self._stack.setDirty(False)  # This stack does not need to be saved.


        ## Check if the definition of this script already exists. If not, add it to the registry.
        if "key" in setting_data:
            definitions = ContainerRegistry.getInstance().findDefinitionContainers(id = setting_data["key"])
            if definitions:
                # Definition was found
                self._definition = definitions[0]
            else:
                self._definition = DefinitionContainer(setting_data["key"])
                try:
                    self._definition.deserialize(json.dumps(setting_data))
                    ContainerRegistry.getInstance().addContainer(self._definition)
                except ContainerFormatError:
                    self._definition = None
                    return
        self._stack.addContainer(self._definition)
        self._instance = InstanceContainer(container_id="ScriptInstanceContainer")
        self._instance.setDefinition(self._definition.getId())
        self._instance.addMetaDataEntry("setting_version", self._definition.getMetaDataEntry("setting_version", default = 0))
        self._stack.addContainer(self._instance)
        self._stack.propertyChanged.connect(self._onPropertyChanged)

        ContainerRegistry.getInstance().addContainer(self._stack)

    settingsLoaded = Signal()
    valueChanged = Signal()  # Signal emitted whenever a value of a setting is changed

    def _onPropertyChanged(self, key, property_name):
        if property_name == "value":
            self.valueChanged.emit()

            # Property changed: trigger reslice
            # To do this we use the global container stack propertyChanged.
            # Reslicing is necessary for setting changes in this plugin, because the changes
            # are applied only once per "fresh" gcode
            global_container_stack = Application.getInstance().getGlobalContainerStack()
            global_container_stack.propertyChanged.emit(key, property_name)

    ##  Needs to return a dict that can be used to construct a settingcategory file.
    #   See the example script for an example.
    #   It follows the same style / guides as the Uranium settings.
    #   Scripts can either override getSettingData directly, or use getSettingDataString
    #   to return a string that will be parsed as json. The latter has the benefit over
    #   returning a dict in that the order of settings is maintained.
    def getSettingData(self):
        setting_data = self.getSettingDataString()
        if type(setting_data) == str:
            setting_data = json.loads(setting_data, object_pairs_hook = collections.OrderedDict)
        return setting_data

    def getSettingDataString(self):
        raise NotImplementedError()

    def getDefinitionId(self):
        if self._stack:
            return self._stack.getBottom().getId()

    def getStackId(self):
        if self._stack:
            return self._stack.getId()

    ##  Convenience function that retrieves value of a setting from the stack.
    def getSettingValueByKey(self, key):
        return self._stack.getProperty(key, "value")

    ##  Convenience function that finds the value in a line of g-code.
    #   When requesting key = x from line "G1 X100" the value 100 is returned.
    def getValue(self, line, key, default = None):
        if not key in line or (';' in line and line.find(key) > line.find(';')):
            return default
        sub_part = line[line.find(key) + 1:]
        m = re.search('^-?[0-9]+\.?[0-9]*', sub_part)
        if m is None:
            return default
        try:
            return float(m.group(0))
        except:
            return default

    ##  Convenience function to produce a line of g-code.
    #
    #   You can put in an original g-code line and it'll re-use all the values
    #   in that line.
    #   All other keyword parameters are put in the result in g-code's format.
    #   For instance, if you put ``G=1`` in the parameters, it will output
    #   ``G1``. If you put ``G=1, X=100`` in the parameters, it will output
    #   ``G1 X100``. The parameters G and M will always be put first. The
    #   parameters T and S will be put second (or first if there is no G or M).
    #   The rest of the parameters will be put in arbitrary order.
    #   \param line The original g-code line that must be modified. If not
    #   provided, an entirely new g-code line will be produced.
    #   \return A line of g-code with the desired parameters filled in.
    def putValue(self, line = "", **kwargs):
        #Strip the comment.
        comment = ""
        if ";" in line:
            comment = line[line.find(";"):]
            line = line[:line.find(";")] #Strip the comment.

        #Parse the original g-code line.
        for part in line.split(" "):
            if part == "":
                continue
            parameter = part[0]
            if parameter in kwargs:
                continue #Skip this one. The user-provided parameter overwrites the one in the line.
            value = part[1:]
            kwargs[parameter] = value

        #Write the new g-code line.
        result = ""
        priority_parameters = ["G", "M", "T", "S", "F", "X", "Y", "Z", "E"] #First some parameters that get priority. In order of priority!
        for priority_key in priority_parameters:
            if priority_key in kwargs:
                if result != "":
                    result += " "
                result += priority_key + str(kwargs[priority_key])
                del kwargs[priority_key]
        for key, value in kwargs.items():
            if result != "":
                result += " "
            result += key + str(value)

        #Put the comment back in.
        if comment != "":
            if result != "":
                result += " "
            result += ";" + comment

        return result

    ##  This is called when the script is executed. 
    #   It gets a list of g-code strings and needs to return a (modified) list.
    def execute(self, data):
        raise NotImplementedError()
