from meshroom.common import BaseObject, Property, Variant, VariantList, JSValue
from meshroom.core import cgroup

from collections.abc import Iterable
from enum import Enum
import math
import os
import psutil
import types
import ast
import distutils.util
import shlex

class Attribute(BaseObject):
    """
    """

    def __init__(self, name, label, description, value, advanced, semantic, uid, group, enabled, uidIgnoreValue=None,
                 validValue=True, errorMessage="", visible=True):
        super(Attribute, self).__init__()
        self._name = name
        self._label = label
        self._description = description
        self._value = value
        self._uid = uid
        self._group = group
        self._advanced = advanced
        self._enabled = enabled
        self._semantic = semantic
        self._uidIgnoreValue = uidIgnoreValue
        self._validValue = validValue
        self._errorMessage = errorMessage
        self._visible = visible
        self._isExpression = (isinstance(self._value, str) and "{" in self._value) or isinstance(self._value, types.FunctionType)
        self._isDynamicValue = (self._value is None)
        self._valueType = None

    name = Property(str, lambda self: self._name, constant=True)
    label = Property(str, lambda self: self._label, constant=True)
    description = Property(str, lambda self: self._description, constant=True)
    value = Property(Variant, lambda self: self._value, constant=True)
    # isExpression:
    #   The default value of the attribute's descriptor is a static string expression that should be evaluated at runtime.
    #   This property only makes sense for output attributes.
    isExpression = Property(bool, lambda self: self._isExpression, constant=True)
    # isDynamicValue
    #   The default value of the attribute's descriptor is None, so it's not an input value,
    #   but an output value that is computed during the Node's process execution.
    isDynamicValue = Property(bool, lambda self: self._isDynamicValue, constant=True)
    uid = Property(Variant, lambda self: self._uid, constant=True)
    group = Property(str, lambda self: self._group, constant=True)
    advanced = Property(bool, lambda self: self._advanced, constant=True)
    enabled = Property(Variant, lambda self: self._enabled, constant=True)
    semantic = Property(str, lambda self: self._semantic, constant=True)
    uidIgnoreValue = Property(Variant, lambda self: self._uidIgnoreValue, constant=True)
    validValue = Property(Variant, lambda self: self._validValue, constant=True)
    errorMessage = Property(str, lambda self: self._errorMessage, constant=True)
    visible = Property(bool, lambda self: self._visible, constant=True)
    type = Property(str, lambda self: self.__class__.__name__, constant=True)

    def validateValue(self, value):
        """ Return validated/conformed 'value'. Need to be implemented in derived classes.

        Raises:
            ValueError: if value does not have the proper type
        """
        raise NotImplementedError("Attribute.validateValue is an abstract function that should be implemented in the derived class.")

    def checkValueTypes(self):
        """ Returns the attribute's name if the default value's type is invalid or if the range's type (when available)
        is invalid, empty string otherwise.

        Returns:
            string: the attribute's name if the default value's or range's type is invalid, empty string otherwise
        """
        raise NotImplementedError("Attribute.checkValueTypes is an abstract function that should be implemented in the derived class.")

    def matchDescription(self, value, strict=True):
        """ Returns whether the value perfectly match attribute's description.

        Args:
            value: the value
            strict: strict test for the match (for instance, regarding a group with some parameter changes)
        """
        try:
            self.validateValue(value)
        except ValueError:
            return False
        return True


class ListAttribute(Attribute):
    """ A list of Attributes """
    def __init__(self, elementDesc, name, label, description, group='allParams', advanced=False, semantic='', enabled=True, joinChar=' ', visible=True):
        """
        :param elementDesc: the Attribute description of elements to store in that list
        """
        self._elementDesc = elementDesc
        self._joinChar = joinChar
        super(ListAttribute, self).__init__(name=name, label=label, description=description, value=[], uid=(), group=group, advanced=advanced, semantic=semantic, enabled=enabled, visible=visible)

    elementDesc = Property(Attribute, lambda self: self._elementDesc, constant=True)
    uid = Property(Variant, lambda self: self.elementDesc.uid, constant=True)
    joinChar = Property(str, lambda self: self._joinChar, constant=True)

    def validateValue(self, value):
        if value is None:
            return value
        if JSValue is not None and isinstance(value, JSValue):
            # Note: we could use isArray(), property("length").toInt() to retrieve all values
            raise ValueError("ListAttribute.validateValue: cannot recognize QJSValue. Please, use JSON.stringify(value) in QML.")
        if isinstance(value, str):
            # Alternative solution to set values from QML is to convert values to JSON string
            # In this case, it works with all data types
            value = ast.literal_eval(value)

        if not isinstance(value, (list, tuple)):
            raise ValueError('ListAttribute only supports list/tuple input values (param:{}, value:{}, type:{})'.format(self.name, value, type(value)))
        return value

    def checkValueTypes(self):
        return self.elementDesc.checkValueTypes()

    def matchDescription(self, value, strict=True):
        """ Check that 'value' content matches ListAttribute's element description. """
        if not super(ListAttribute, self).matchDescription(value, strict):
            return False
        # list must be homogeneous: only test first element
        if value:
            return self._elementDesc.matchDescription(value[0], strict)
        return True


class GroupAttribute(Attribute):
    """ A macro Attribute composed of several Attributes """
    def __init__(self, groupDesc, name, label, description, group='allParams', advanced=False, semantic='', enabled=True, joinChar=' ', brackets=None, visible=True):
        """
        :param groupDesc: the description of the Attributes composing this group
        """
        self._groupDesc = groupDesc
        self._joinChar = joinChar
        self._brackets = brackets
        super(GroupAttribute, self).__init__(name=name, label=label, description=description, value={}, uid=(), group=group, advanced=advanced, semantic=semantic, enabled=enabled, visible=visible)

    groupDesc = Property(Variant, lambda self: self._groupDesc, constant=True)

    def validateValue(self, value):
        if value is None:
            return value
        """ Ensure value is compatible with the group description and convert value if needed. """
        if JSValue is not None and isinstance(value, JSValue):
            # Note: we could use isArray(), property("length").toInt() to retrieve all values
            raise ValueError("GroupAttribute.validateValue: cannot recognize QJSValue. Please, use JSON.stringify(value) in QML.")
        if isinstance(value, str):
            # Alternative solution to set values from QML is to convert values to JSON string
            # In this case, it works with all data types
            value = ast.literal_eval(value)

        if isinstance(value, dict):
            # invalidKeys = set(value.keys()).difference([attr.name for attr in self._groupDesc])
            # if invalidKeys:
            #     raise ValueError('Value contains key that does not match group description : {}'.format(invalidKeys))
            if self._groupDesc and value.keys():
                commonKeys = set(value.keys()).intersection([attr.name for attr in self._groupDesc])
                if not commonKeys:
                    raise ValueError(f'Value contains no key that matches with the group description (name={self.name}, values={value.keys()}, desc={[attr.name for attr in self._groupDesc]})')
        elif isinstance(value, (list, tuple, set)):
            if len(value) != len(self._groupDesc):
                raise ValueError('Value contains incoherent number of values: desc size: {}, value size: {}'.format(len(self._groupDesc), len(value)))
        else:
            raise ValueError('GroupAttribute only supports dict/list/tuple input values (param:{}, value:{}, type:{})'.format(self.name, value, type(value)))

        return value

    def checkValueTypes(self):
        """ Check the default value's and range's (if available) type of every attribute contained in the group
        (including nested attributes).

        Returns an empty string if all the attributes' types are valid, or concatenates the names of the attributes in
        the group with invalid types.
        """
        invalidParams = []
        for attr in self.groupDesc:
            name = attr.checkValueTypes()
            if name:
                invalidParams.append(name)
        if invalidParams:
            # In group "group", if parameters "x" and "y" (with "y" in nested group "subgroup") are invalid, the
            # returned string will be: "group:x, group:subgroup:y"
            return self.name + ":" + str(", " + self.name + ":").join(invalidParams)
        return ""

    def matchDescription(self, value, strict=True):
        """
        Check that 'value' contains the exact same set of keys as GroupAttribute's group description
        and that every child value match corresponding child attribute description.

        Args:
            value: the value
            strict: strict test for the match (for instance, regarding a group with some parameter changes)
        """
        if not super(GroupAttribute, self).matchDescription(value):
            return False
        attrMap = {attr.name: attr for attr in self._groupDesc}

        matchCount = 0
        for k, v in value.items():
            # each child value must match corresponding child attribute description
            if k in attrMap and attrMap[k].matchDescription(v, strict):
                matchCount += 1

        if strict:
            return matchCount == len(value.items()) == len(self._groupDesc)

        return matchCount > 0

    def retrieveChildrenUids(self):
        allUids = []
        for desc in self._groupDesc:
            allUids.extend(desc.uid)
        return allUids

    uid = Property(Variant, retrieveChildrenUids, constant=True)
    joinChar = Property(str, lambda self: self._joinChar, constant=True)
    brackets = Property(str, lambda self: self._brackets, constant=True)


class Param(Attribute):
    """
    """
    def __init__(self, name, label, description, value, uid, group, advanced, semantic, enabled, uidIgnoreValue=None, validValue=True, errorMessage="", visible=True):
        super(Param, self).__init__(name=name, label=label, description=description, value=value, uid=uid, group=group, advanced=advanced, semantic=semantic, enabled=enabled,
            uidIgnoreValue=uidIgnoreValue, validValue=validValue, errorMessage=errorMessage, visible=visible)


class File(Attribute):
    """
    """
    def __init__(self, name, label, description, value, uid, group='allParams', advanced=False, semantic='', enabled=True, visible=True):
        super(File, self).__init__(name=name, label=label, description=description, value=value, uid=uid, group=group, advanced=advanced, semantic=semantic, enabled=enabled, visible=visible)
        self._valueType = str

    def validateValue(self, value):
        if value is None:
            return value
        if not isinstance(value, str):
            raise ValueError('File only supports string input  (param:{}, value:{}, type:{})'.format(self.name, value, type(value)))
        return os.path.normpath(value).replace('\\', '/') if value else ''

    def checkValueTypes(self):
        # Some File values are functions generating a string: check whether the value is a string or if it
        # is a function (but there is no way to check that the function's output is indeed a string)
        if not isinstance(self.value, str) and not callable(self.value):
            return self.name
        return ""


class BoolParam(Param):
    """
    """
    def __init__(self, name, label, description, value, uid, group='allParams', advanced=False, semantic='', enabled=True, visible=True):
        super(BoolParam, self).__init__(name=name, label=label, description=description, value=value, uid=uid, group=group, advanced=advanced, semantic=semantic, enabled=enabled, visible=visible)
        self._valueType = bool

    def validateValue(self, value):
        if value is None:
            return value
        try:
            if isinstance(value, str):
                # use distutils.util.strtobool to handle (1/0, true/false, on/off, y/n)
                return bool(distutils.util.strtobool(value))
            return bool(value)
        except:
            raise ValueError('BoolParam only supports bool value (param:{}, value:{}, type:{})'.format(self.name, value, type(value)))

    def checkValueTypes(self):
        if not isinstance(self.value, bool):
            return self.name
        return ""


class IntParam(Param):
    """
    """
    def __init__(self, name, label, description, value, range, uid, group='allParams', advanced=False, semantic='', enabled=True, validValue=True, errorMessage="", visible=True):
        self._range = range
        super(IntParam, self).__init__(name=name, label=label, description=description, value=value, uid=uid, group=group, advanced=advanced, semantic=semantic, enabled=enabled,
            validValue=validValue, errorMessage=errorMessage, visible=visible)
        self._valueType = int

    def validateValue(self, value):
        if value is None:
            return value
        # handle unsigned int values that are translated to int by shiboken and may overflow
        try:
            return int(value)
        except:
            raise ValueError('IntParam only supports int value (param:{}, value:{}, type:{})'.format(self.name, value, type(value)))

    def checkValueTypes(self):
        if not isinstance(self.value, int) or (self.range and not all([isinstance(r, int) for r in self.range])):
            return self.name
        return ""

    range = Property(VariantList, lambda self: self._range, constant=True)


class FloatParam(Param):
    """
    """
    def __init__(self, name, label, description, value, range, uid, group='allParams', advanced=False, semantic='', enabled=True, validValue=True, errorMessage="", visible=True):
        self._range = range
        super(FloatParam, self).__init__(name=name, label=label, description=description, value=value, uid=uid, group=group, advanced=advanced, semantic=semantic, enabled=enabled,
            validValue=validValue, errorMessage=errorMessage, visible=visible)
        self._valueType = float

    def validateValue(self, value):
        if value is None:
            return value
        try:
            return float(value)
        except:
            raise ValueError('FloatParam only supports float value (param:{}, value:{}, type:{})'.format(self.name, value, type(value)))

    def checkValueTypes(self):
        if not isinstance(self.value, float) or (self.range and not all([isinstance(r, float) for r in self.range])):
            return self.name
        return ""

    range = Property(VariantList, lambda self: self._range, constant=True)

class PushButtonParam(Param):
    """
    """
    def __init__(self, name, label, description, uid, group='allParams', advanced=False, semantic='', enabled=True, visible=True):
        super(PushButtonParam, self).__init__(name=name, label=label, description=description, value=None, uid=uid, group=group, advanced=advanced, semantic=semantic, enabled=enabled, visible=visible)
        self._valueType = None

    def validateValue(self, value):
        return value
    def checkValueTypes(self):
        pass

class ChoiceParam(Param):
    """
    """
    def __init__(self, name, label, description, value, values, exclusive, uid, group='allParams', joinChar=' ', advanced=False, semantic='',
                 enabled=True, validValue=True, errorMessage="", visible=True):
        assert values
        super(ChoiceParam, self).__init__(name=name, label=label, description=description, value=value, uid=uid, group=group, advanced=advanced,
                                          semantic=semantic, enabled=enabled, validValue=validValue, errorMessage=errorMessage, visible=visible)
        self._values = values
        self._exclusive = exclusive
        self._joinChar = joinChar
        if self._values:
            # Look at the type of the first element of the possible values
            self._valueType = type(self._values[0])
        elif not exclusive:
            # Possible values may be defined later, so use the value to define the type.
            # if non exclusive, it is a list
            self._valueType = type(self._value[0])
        else:
            self._valueType = type(self._value)

    def conformValue(self, value):
        """ Conform 'value' to the correct type and check for its validity """
        # We do not check that the value is in the list of values.
        # This allows to have a value that is not in the list of possible values.
        return self._valueType(value)

    def validateValue(self, value):
        if value is None:
            return value
        if self.exclusive:
            return self.conformValue(value)

        if isinstance(value, str):
            value = value.split(',')

        if not isinstance(value, Iterable):
            raise ValueError('Non exclusive ChoiceParam value should be iterable (param: {}, value: {}, type: {}).'.format(self.name, value, type(value)))

        return [self.conformValue(v) for v in value]

    def checkValueTypes(self):
        # Check that the values have been provided as a list
        if not isinstance(self._values, list):
            return self.name

        # If the choices are not exclusive, check that 'value' is a list, and check that it does not contain values that
        # are not available
        elif not self.exclusive and (not isinstance(self._value, list) or
             not all(val in self._values for val in self._value)):
            return self.name

        # If the choices are exclusive, the value should NOT be a list but it can contain any value that is not in the
        # list of possible ones
        elif self.exclusive and isinstance(self._value, list):
            return self.name

        return ""

    values = Property(VariantList, lambda self: self._values, constant=True)
    exclusive = Property(bool, lambda self: self._exclusive, constant=True)
    joinChar = Property(str, lambda self: self._joinChar, constant=True)


class StringParam(Param):
    """
    """
    def __init__(self, name, label, description, value, uid, group='allParams', advanced=False, semantic='', enabled=True, uidIgnoreValue=None, validValue=True, errorMessage="", visible=True):
        super(StringParam, self).__init__(name=name, label=label, description=description, value=value, uid=uid, group=group, advanced=advanced, semantic=semantic, enabled=enabled,
            uidIgnoreValue=uidIgnoreValue, validValue=validValue, errorMessage=errorMessage, visible=visible)
        self._valueType = str

    def validateValue(self, value):
        if value is None:
            return value
        if not isinstance(value, str):
            raise ValueError('StringParam value should be a string (param:{}, value:{}, type:{})'.format(self.name, value, type(value)))
        return value

    def checkValueTypes(self):
        if not isinstance(self.value, str):
            return self.name
        return ""


class ColorParam(Param):
    """
    """
    def __init__(self, name, label, description, value, uid, group='allParams', advanced=False, semantic='', enabled=True, visible=True):
        super(ColorParam, self).__init__(name=name, label=label, description=description, value=value, uid=uid, group=group, advanced=advanced, semantic=semantic, enabled=enabled, visible=visible)
        self._valueType = str

    def validateValue(self, value):
        if value is None:
            return value
        if not isinstance(value, str) or len(value.split(" ")) > 1:
            raise ValueError('ColorParam value should be a string containing either an SVG name or an hexadecimal '
                             'color code (param: {}, value: {}, type: {})'.format(self.name, value, type(value)))
        return value


class Level(Enum):
    NONE = 0
    NORMAL = 1
    INTENSIVE = 2


class Range:
    def __init__(self, iteration=0, blockSize=0, fullSize=0):
        self.iteration = iteration
        self.blockSize = blockSize
        self.fullSize = fullSize

    @property
    def start(self):
        return self.iteration * self.blockSize

    @property
    def effectiveBlockSize(self):
        remaining = (self.fullSize - self.start) + 1
        return self.blockSize if remaining >= self.blockSize else remaining

    @property
    def end(self):
        return self.start + self.effectiveBlockSize

    @property
    def last(self):
        return self.end - 1

    def toDict(self):
        return {
            "rangeIteration": self.iteration,
            "rangeStart": self.start,
            "rangeEnd": self.end,
            "rangeLast": self.last,
            "rangeBlockSize": self.blockSize,
            "rangeEffectiveBlockSize": self.effectiveBlockSize,
            "rangeFullSize": self.fullSize,
            }


class Parallelization:
    def __init__(self, staticNbBlocks=0, blockSize=0):
        self.staticNbBlocks = staticNbBlocks
        self.blockSize = blockSize

    def getSizes(self, node):
        """
        Args:
            node:
        Returns: (blockSize, fullSize, nbBlocks)
        """
        size = node.size
        if self.blockSize:
            nbBlocks = int(math.ceil(float(size) / float(self.blockSize)))
            return self.blockSize, size, nbBlocks
        if self.staticNbBlocks:
            return 1, self.staticNbBlocks, self.staticNbBlocks
        return None

    def getRange(self, node, iteration):
        blockSize, fullSize, nbBlocks = self.getSizes(node)
        return Range(iteration=iteration, blockSize=blockSize, fullSize=fullSize)

    def getRanges(self, node):
        blockSize, fullSize, nbBlocks = self.getSizes(node)
        ranges = []
        for i in range(nbBlocks):
            ranges.append(Range(iteration=i, blockSize=blockSize, fullSize=fullSize))
        return ranges


class DynamicNodeSize(object):
    """
    DynamicNodeSize expresses a dependency to an input attribute to define
    the size of a Node in terms of individual tasks for parallelization.
    If the attribute is a link to another node, Node's size will be the same as this connected node.
    If the attribute is a ListAttribute, Node's size will be the size of this list.
    """
    def __init__(self, param):
        self._param = param

    def computeSize(self, node):
        param = node.attribute(self._param)
        # Link: use linked node's size
        if param.isLink:
            return param.getLinkParam().node.size
        # ListAttribute: use list size
        if isinstance(param.desc, ListAttribute):
            return len(param)
        if isinstance(param.desc, IntParam):
            return param.value
        return 1


class MultiDynamicNodeSize(object):
    """
    MultiDynamicNodeSize expresses dependencies to multiple input attributes to
    define the size of a node in terms of individual tasks for parallelization.
    Works as DynamicNodeSize and sum the sizes of each dependency.
    """
    def __init__(self, params):
        """
        Args:
            params (list): list of input attributes names
        """
        assert isinstance(params, (list, tuple))
        self._params = params

    def computeSize(self, node):
        size = 0
        for param in self._params:
            param = node.attribute(param)
            if param.isLink:
                size += param.getLinkParam().node.size
            elif isinstance(param.desc, ListAttribute):
                size += len(param)
            else:
                size += 1
        return size


class StaticNodeSize(object):
    """
    StaticNodeSize expresses a static Node size in terms of individual tasks for parallelization.
    """
    def __init__(self, size):
        self._size = size

    def computeSize(self, node):
        return self._size


class Node(object):
    """
    """
    internalFolder = '{cache}/{nodeType}/{uid0}/'
    cpu = Level.NORMAL
    gpu = Level.NONE
    ram = Level.NORMAL
    packageName = ''
    packageVersion = ''
    internalInputs = [
        StringParam(
            name="invalidation",
            label="Invalidation Message",
            description="A message that will invalidate the node's output folder.\n"
                        "This is useful for development, we can invalidate the output of the node when we modify the code.\n"
                        "It is displayed in bold font in the invalidation/comment messages tooltip.",
            value="",
            semantic="multiline",
            uid=[0],
            advanced=True,
            uidIgnoreValue="",  # If the invalidation string is empty, it does not participate to the node's UID
        ),
        StringParam(
            name="comment",
            label="Comments",
            description="User comments describing this specific node instance.\n"
                        "It is displayed in regular font in the invalidation/comment messages tooltip.",
            value="",
            semantic="multiline",
            uid=[],
        ),
        StringParam(
            name="label",
            label="Node's Label",
            description="Customize the default label (to replace the technical name of the node instance).",
            value="",
            uid=[],
        ),
        ColorParam(
            name="color",
            label="Color",
            description="Custom color for the node (SVG name or hexadecimal code).",
            value="",
            uid=[],
        )
    ]
    inputs = []
    outputs = []
    size = StaticNodeSize(1)
    parallelization = None
    documentation = ''
    category = 'Other'

    def __init__(self):
        super(Node, self).__init__()
        self.hasDynamicOutputAttribute = any(output.isDynamicValue for output in self.outputs)

    def upgradeAttributeValues(self, attrValues, fromVersion):
        return attrValues

    @classmethod
    def update(cls, node):
        """ Method call before node's internal update on invalidation.

        Args:
            node: the BaseNode instance being updated
        See Also:
            BaseNode.updateInternals
        """
        pass
    @classmethod
    def postUpdate(cls, node):
        """ Method call after node's internal update on invalidation.

        Args:
            node: the BaseNode instance being updated
        See Also:
            NodeBase.updateInternals
        """
        pass

    def stopProcess(self, chunk):
        raise NotImplementedError('No stopProcess implementation on node: {}'.format(chunk.node.name))

    def processChunk(self, chunk):
        raise NotImplementedError('No processChunk implementation on node: "{}"'.format(chunk.node.name))

class InputNode(Node):
    """
    Node that does not need to be processed, it is just a placeholder for inputs.
    """
    def __init__(self):
        super(InputNode, self).__init__()

    def processChunk(self, chunk):
        pass


class CommandLineNode(Node):
    """
    """
    commandLine = ''  # need to be defined on the node
    parallelization = None
    commandLineRange = ''

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

    def buildCommandLine(self, chunk):

        cmdPrefix = ''
        # if rez available in env, we use it
        if 'REZ_ENV' in os.environ and chunk.node.packageVersion:
            # if the node package is already in the environment, we don't need a new dedicated rez environment
            alreadyInEnv = os.environ.get('REZ_{}_VERSION'.format(chunk.node.packageName.upper()), "").startswith(chunk.node.packageVersion)
            if not alreadyInEnv:
                cmdPrefix = '{rez} {packageFullName} -- '.format(rez=os.environ.get('REZ_ENV'), packageFullName=chunk.node.packageFullName)

        cmdSuffix = ''
        if chunk.node.isParallelized and chunk.node.size > 1:
            cmdSuffix = ' ' + self.commandLineRange.format(**chunk.range.toDict())

        return cmdPrefix + chunk.node.nodeDesc.commandLine.format(**chunk.node._cmdVars) + cmdSuffix

    def stopProcess(self, chunk):
        # the same node could exists several times in the graph and
        # only one would have the running subprocess; ignore all others
        if not hasattr(chunk, "subprocess"):
            return
        if chunk.subprocess:
            # kill process tree
            processes = chunk.subprocess.children(recursive=True) + [chunk.subprocess]
            try:
                for process in processes:
                    process.terminate()
            except psutil.NoSuchProcess:
                pass

    def processChunk(self, chunk):
        try:
            with open(chunk.logFile, 'w') as logF:
                cmd = self.buildCommandLine(chunk)
                chunk.status.commandLine = cmd
                chunk.saveStatusFile()
                print(' - commandLine: {}'.format(cmd))
                print(' - logFile: {}'.format(chunk.logFile))
                chunk.subprocess = psutil.Popen(shlex.split(cmd), stdout=logF, stderr=logF, cwd=chunk.node.internalFolder)

                # store process static info into the status file
                # chunk.status.env = node.proc.environ()
                # chunk.status.createTime = node.proc.create_time()

                chunk.statThread.proc = chunk.subprocess
                stdout, stderr = chunk.subprocess.communicate()
                chunk.subprocess.wait()

                chunk.status.returnCode = chunk.subprocess.returncode

            if chunk.subprocess.returncode != 0:
                with open(chunk.logFile, 'r') as logF:
                    logContent = ''.join(logF.readlines())
                raise RuntimeError('Error on node "{}":\nLog:\n{}'.format(chunk.name, logContent))
        except:
            raise
        finally:
            chunk.subprocess = None

#specific command line node for alicevision apps
class AVCommandLineNode(CommandLineNode):

    cgroupParsed = False
    cmdMem = ''
    cmdCore = ''

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

        if AVCommandLineNode.cgroupParsed is False:

            AVCommandLineNode.cmdMem = ''
            memSize = cgroup.getCgroupMemorySize()
            if memSize > 0:
                AVCommandLineNode.cmdMem = ' --maxMemory={memSize}'.format(memSize=memSize)

            AVCommandLineNode.cmdCore = ''
            coresCount = cgroup.getCgroupCpuCount()
            if coresCount > 0:
                AVCommandLineNode.cmdCore = ' --maxCores={coresCount}'.format(coresCount=coresCount)

            AVCommandLineNode.cgroupParsed = True

    def buildCommandLine(self, chunk):

        commandLineString = super(AVCommandLineNode, self).buildCommandLine(chunk)

        return commandLineString + AVCommandLineNode.cmdMem + AVCommandLineNode.cmdCore

# Test abstract node
class InitNode(object):
    def __init__(self):
        super(InitNode, self).__init__()

    def initialize(self, node, inputs, recursiveInputs):
        """
        Initialize the attributes that are needed for a node to start running.

        Args:
            node (Node): the node whose attributes must be initialized
            inputs (list): the user-provided list of input files/directories
            recursiveInputs (list): the user-provided list of input directories to search recursively for images
        """
        pass

    def resetAttributes(self, node, attributeNames):
        """
        Reset the values of the provided attributes for a node.

        Args:
            node (Node): the node whose attributes are to be reset
            attributeNames (list): the list containing the names of the attributes to reset
        """
        for attrName in attributeNames:
            if node.hasAttribute(attrName):
                node.attribute(attrName).resetToDefaultValue()

    def extendAttributes(self, node, attributesDict):
        """
        Extend the values of the provided attributes for a node.

        Args:
            node (Node): the node whose attributes are to be extended
            attributesDict (dict): the dictionary containing the attributes' names (as keys) and the values to extend with
        """
        for attr in attributesDict.keys():
            if node.hasAttribute(attr):
                node.attribute(attr).extend(attributesDict[attr])

    def setAttributes(self, node, attributesDict):
        """
        Set the values of the provided attributes for a node.

        Args:
            node (Node): the node whose attributes are to be extended
            attributesDict (dict): the dictionary containing the attributes' names (as keys) and the values to set
        """
        for attr in attributesDict:
            if node.hasAttribute(attr):
                node.attribute(attr).value = attributesDict[attr]