# IfcOpenShell - IFC toolkit and geometry engine
# Copyright (C) 2021-2022 Dion Moult <dion@thinkmoult.com>, Yassine Oualid <yassine@sigmadimensions.com>
#
# This file is part of IfcOpenShell.
#
# IfcOpenShell is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# IfcOpenShell is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.

import ifcopenshell
import ifcopenshell.util.system
import ifcopenshell.util.element


class Usecase:
    def __init__(self, file, task=None):
        """Duplicates a task in the project

        The following relationships are also duplicated:

        * The copy will have the same attributes and property sets as the original task
        * The copy will be assigned to the parent task or work schedule
        * The copy will have duplicated nested tasks

        :param task: The task to be duplicated
        :type task: ifcopenshell.entity_instance.entity_instance
        :return: The duplicated task
        :rtype: ifcopenshell.entity_instance.entity_instance

        Example:
        .. code:: python

            # We have a task
            original_task = Task(name="Design new feature", deadline="2023-03-01")

            # And now we have two
            duplicated_task = project.duplicate_task(original_task)
        """
        self.file = file
        self.settings = {"task": task}

    def execute(self):
        result = ifcopenshell.util.element.copy_deep(self.file, self.settings["task"])
        self.copy_indirect_attributes(self.settings["task"], result)
        self.copy_sequence_relationship([self.settings["task"]], [result])
        return result

    def copy_sequence_relationship(self, original_tasks, duplicated_tasks):
        for i, original_task in enumerate(original_tasks):
            for inverse in self.file.get_inverse(original_task):
                if inverse.is_a("IfcRelSequence") and (
                    inverse.RelatingProcess == original_task
                    or inverse.RelatedProcess == original_task
                ):
                    original_task_index = original_tasks.index(original_task)
                    duplicated_task = duplicated_tasks[original_task_index]
                    relating_process, related_process = None, None
                    if inverse.RelatingProcess == original_task:
                        relating_process = duplicated_task
                    else:
                        related_process = duplicated_task
                    if inverse.RelatedProcess in original_tasks:
                        related_process_index = original_tasks.index(
                            inverse.RelatedProcess
                        )
                        related_process = duplicated_tasks[related_process_index]
                    if inverse.RelatingProcess in original_tasks:
                        relating_process_index = original_tasks.index(
                            inverse.RelatingProcess
                        )
                        relating_process = duplicated_tasks[relating_process_index]
                    if relating_process and related_process:
                        rel = ifcopenshell.api.run(
                            "sequence.assign_sequence",
                            self.file,
                            relating_process=relating_process,
                            related_process=related_process,
                        )
                        if inverse.TimeLag:
                            ifcopenshell.api.run(
                                "sequence.assign_lag_time",
                                self.file,
                                sequence=rel,
                                lag_time=inverse.TimeLag.LagValue,
                                duration_type=inverse.TimeLag.DurationType,
                            )

    def copy_indirect_attributes(self, from_element, to_element):
        for inverse in self.file.get_inverse(from_element):
            if inverse.is_a("IfcRelDefinesByProperties"):
                inverse = ifcopenshell.util.element.copy(self.file, inverse)
                inverse.RelatedObjects = [to_element]
                pset = ifcopenshell.util.element.copy_deep(
                    self.file, inverse.RelatingPropertyDefinition
                )
                inverse.RelatingPropertyDefinition = pset
            elif inverse.is_a("IfcRelNests") and inverse.RelatingObject == from_element:
                nested_tasks = [e for e in inverse.RelatedObjects if e.is_a("IfcTask")]
                if nested_tasks:
                    new_tasks = [
                        ifcopenshell.api.run(
                            "sequence.duplicate_task", self.file, task=t
                        )
                        for t in nested_tasks
                    ]
                    inverse = ifcopenshell.util.element.copy(self.file, inverse)
                    inverse.RelatingObject = to_element
                    inverse.RelatedObjects = new_tasks
                    for task in new_tasks:
                        ifcopenshell.api.run(
                            "nest.unassign_object", self.file, related_object=task
                        )
                        rel = ifcopenshell.api.run(
                            "nest.assign_object",
                            self.file,
                            related_object=task,
                            relating_object=to_element,
                        )
                    self.copy_sequence_relationship(nested_tasks, new_tasks)

            elif inverse.is_a("IfcRelSequence") and (
                inverse.RelatingProcess == from_element
                or inverse.RelatedProcess == from_element
            ):
                continue
            else:
                for i, value in enumerate(inverse):
                    if value == from_element:
                        new_inverse = ifcopenshell.util.element.copy(self.file, inverse)
                        new_inverse[i] = to_element
                    elif isinstance(value, (tuple, list)) and from_element in value:
                        new_value = list(value)
                        new_value.append(to_element)
                        inverse[i] = new_value