# Copyright (c) 2015 Jaime van Kessel
# Copyright (c) 2018 Ultimaker B.V.
# The PostProcessingPlugin is released under the terms of the LGPLv3 or higher.
from typing import Optional, Any, Dict, TYPE_CHECKING, List

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")

if TYPE_CHECKING:
    from UM.Settings.Interfaces import DefinitionContainerInterface


@signalemitter
class Script:
    """Base class for scripts. All scripts should inherit the script class."""

    def __init__(self) -> None:
        super().__init__()
        self._stack = None  # type: Optional[ContainerStack]
        self._definition = None  # type: Optional[DefinitionContainerInterface]
        self._instance = None  # type: Optional[InstanceContainer]

    def initialize(self) -> 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
        if self._definition is None:
            return
        self._stack.addContainer(self._definition)
        self._instance = InstanceContainer(container_id="ScriptInstanceContainer")
        self._instance.setDefinition(self._definition.getId())
        self._instance.setMetaDataEntry("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: str, property_name: str) -> None:
        if property_name == "value":
            self.valueChanged.emit()

            # Property changed: trigger reslice
            # To do this we use the global container stack propertyChanged.
            # Re-slicing is necessary for setting changes in this plugin, because the changes
            # are applied only once per "fresh" gcode
            global_container_stack = Application.getInstance().getGlobalContainerStack()
            if global_container_stack is not None:
                global_container_stack.propertyChanged.emit(key, property_name)

    def getSettingData(self) -> Dict[str, Any]:
        """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.
        """
        setting_data_as_string = self.getSettingDataString()
        setting_data = json.loads(setting_data_as_string, object_pairs_hook = collections.OrderedDict)
        return setting_data

    def getSettingDataString(self) -> str:
        raise NotImplementedError()

    def getDefinitionId(self) -> Optional[str]:
        if self._stack:
            bottom = self._stack.getBottom()
            if bottom is not None:
                return bottom.getId()
        return None

    def getStackId(self) -> Optional[str]:
        if self._stack:
            return self._stack.getId()
        return None

    def getSettingValueByKey(self, key: str) -> Any:
        """Convenience function that retrieves value of a setting from the stack."""

        if self._stack is not None:
            return self._stack.getProperty(key, "value")
        return None

    def getValue(self, line: str, key: str, default = None) -> Any:
        """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.
        """
        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 int(m.group(0))
        except ValueError: #Not an integer.
            try:
                return float(m.group(0))
            except ValueError: #Not a number at all.
                return default

    def putValue(self, line: str = "", **kwargs) -> str:
        """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 will be added in order G M T S F X Y Z E.
        Any other parameters will be added 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.
        """
        # Strip the comment.
        if ";" in line:
            comment = line[line.find(";"):]
            line = line[:line.find(";")]
        else:
            comment = ""

        # Parse the original g-code line and add them to kwargs.
        for part in line.split(" "):
            if part == "":
                continue
            parameter = part[0]
            if parameter not in kwargs:
                value = part[1:]
                kwargs[parameter] = value

        # Start writing the new g-code line.
        line_parts = list()
        # First add these parameters in order
        for parameter in ["G", "M", "T", "S", "F", "X", "Y", "Z", "E"]:
            if parameter in kwargs:
                value = kwargs.pop(parameter)  # get the corresponding value and remove the parameter from kwargs
                line_parts.append(parameter + str(value))
        # Then add the rest of the parameters
        for parameter, value in kwargs.items():
            line_parts.append(parameter + str(value))

        # If there was a comment, put it at the end.
        if comment != "":
            line_parts.append(comment)

        # Add spaces and return the new line
        return " ".join(line_parts)

    def execute(self, data: List[str]) -> List[str]:
        """This is called when the script is executed. 

        It gets a list of g-code strings and needs to return a (modified) list.
        """
        raise NotImplementedError()
