from copy import deepcopy
from datetime import datetime
from operator import attrgetter
from typing import Sequence, Callable, Type, TypeVar, Union, Tuple

import attr
import dpath
import mongoengine
from mongoengine import EmbeddedDocument, Q
from mongoengine.queryset.transform import COMPARISON_OPERATORS
from pymongo import UpdateOne

from apiserver.apierrors import errors, APIError
from apiserver.apierrors.errors.bad_request import InvalidTaskId
from apiserver.apimodels.base import (
    UpdateResponse,
    IdResponse,
    MakePublicRequest,
    MoveRequest,
)
from apiserver.apimodels.tasks import (
    StartedResponse,
    ResetResponse,
    PublishRequest,
    PublishResponse,
    CreateRequest,
    UpdateRequest,
    SetRequirementsRequest,
    TaskRequest,
    DeleteRequest,
    PingRequest,
    EnqueueRequest,
    EnqueueResponse,
    DequeueResponse,
    CloneRequest,
    AddOrUpdateArtifactsRequest,
    GetTypesRequest,
    ResetRequest,
    GetHyperParamsRequest,
    EditHyperParamsRequest,
    DeleteHyperParamsRequest,
    GetConfigurationsRequest,
    EditConfigurationRequest,
    DeleteConfigurationRequest,
    GetConfigurationNamesRequest,
    DeleteArtifactsRequest,
    ArchiveResponse,
    ArchiveRequest,
)
from apiserver.bll.event import EventBLL
from apiserver.bll.organization import OrgBLL, Tags
from apiserver.bll.project import ProjectBLL
from apiserver.bll.queue import QueueBLL
from apiserver.bll.task import (
    TaskBLL,
    ChangeStatusRequest,
    update_project_time,
    split_by,
)
from apiserver.bll.task.artifacts import (
    artifacts_prepare_for_save,
    artifacts_unprepare_from_saved,
    Artifacts,
)
from apiserver.bll.task.hyperparams import HyperParams
from apiserver.bll.task.non_responsive_tasks_watchdog import NonResponsiveTasksWatchdog
from apiserver.bll.task.param_utils import (
    params_prepare_for_save,
    params_unprepare_from_saved,
    escape_paths,
)
from apiserver.bll.util import SetFieldsResolver
from apiserver.database.errors import translate_errors_context
from apiserver.database.model import EntityVisibility
from apiserver.database.model.model import Model
from apiserver.database.model.task.output import Output
from apiserver.database.model.task.task import (
    Task,
    TaskStatus,
    Script,
    DEFAULT_LAST_ITERATION,
    Execution,
    ArtifactModes,
)
from apiserver.database.utils import get_fields_attr, parse_from_call
from apiserver.service_repo import APICall, endpoint
from apiserver.services.utils import (
    conform_tag_fields,
    conform_output_tags,
    validate_tags,
)
from apiserver.timing_context import TimingContext
from apiserver.utilities.partial_version import PartialVersion

task_fields = set(Task.get_fields())
task_script_stripped_fields = set(
    [f for f, v in get_fields_attr(Script, "strip").items() if v]
)

task_bll = TaskBLL()
event_bll = EventBLL()
queue_bll = QueueBLL()
org_bll = OrgBLL()
project_bll = ProjectBLL()

NonResponsiveTasksWatchdog.start()


def set_task_status_from_call(
    request: UpdateRequest, company_id, new_status=None, **set_fields
) -> dict:
    fields_resolver = SetFieldsResolver(set_fields)
    task = TaskBLL.get_task_with_access(
        request.task,
        company_id=company_id,
        only=tuple(
            {"status", "project", "started", "duration"} | fields_resolver.get_names()
        ),
        requires_write_access=True,
    )

    if "duration" not in fields_resolver.get_names():
        if new_status == Task.started:
            fields_resolver.add_fields(min__duration=max(0, task.duration or 0))
        elif new_status in (
            TaskStatus.completed,
            TaskStatus.failed,
            TaskStatus.stopped,
        ):
            fields_resolver.add_fields(
                duration=int((task.started - datetime.utcnow()).total_seconds())
            )

    status_reason = request.status_reason
    status_message = request.status_message
    force = request.force
    return ChangeStatusRequest(
        task=task,
        new_status=new_status or task.status,
        status_reason=status_reason,
        status_message=status_message,
        force=force,
    ).execute(**fields_resolver.get_fields(task))


@endpoint("tasks.get_by_id", request_data_model=TaskRequest)
def get_by_id(call: APICall, company_id, req_model: TaskRequest):
    task = TaskBLL.get_task_with_access(
        req_model.task, company_id=company_id, allow_public=True
    )
    task_dict = task.to_proper_dict()
    unprepare_from_saved(call, task_dict)
    call.result.data = {"task": task_dict}


def escape_execution_parameters(call: APICall):
    projection = Task.get_projection(call.data)
    if projection:
        Task.set_projection(call.data, escape_paths(projection))

    ordering = Task.get_ordering(call.data)
    if ordering:
        Task.set_ordering(call.data, escape_paths(ordering))


@endpoint("tasks.get_all_ex", required_fields=[])
def get_all_ex(call: APICall, company_id, _):
    conform_tag_fields(call, call.data)

    escape_execution_parameters(call)

    with translate_errors_context():
        with TimingContext("mongo", "task_get_all_ex"):
            tasks = Task.get_many_with_join(
                company=company_id,
                query_dict=call.data,
                allow_public=True,  # required in case projection is requested for public dataset/versions
            )
        unprepare_from_saved(call, tasks)
        call.result.data = {"tasks": tasks}


@endpoint("tasks.get_by_id_ex", required_fields=["id"])
def get_by_id_ex(call: APICall, company_id, _):
    conform_tag_fields(call, call.data)

    escape_execution_parameters(call)

    with translate_errors_context():
        with TimingContext("mongo", "task_get_by_id_ex"):
            tasks = Task.get_many_with_join(
                company=company_id, query_dict=call.data, allow_public=True,
            )

        unprepare_from_saved(call, tasks)
        call.result.data = {"tasks": tasks}


@endpoint("tasks.get_all", required_fields=[])
def get_all(call: APICall, company_id, _):
    conform_tag_fields(call, call.data)

    escape_execution_parameters(call)

    with translate_errors_context():
        with TimingContext("mongo", "task_get_all"):
            tasks = Task.get_many(
                company=company_id,
                parameters=call.data,
                query_dict=call.data,
                allow_public=True,  # required in case projection is requested for public dataset/versions
            )
        unprepare_from_saved(call, tasks)
        call.result.data = {"tasks": tasks}


@endpoint("tasks.get_types", request_data_model=GetTypesRequest)
def get_types(call: APICall, company_id, request: GetTypesRequest):
    call.result.data = {
        "types": list(task_bll.get_types(company_id, project_ids=request.projects))
    }


@endpoint(
    "tasks.stop", request_data_model=UpdateRequest, response_data_model=UpdateResponse
)
def stop(call: APICall, company_id, req_model: UpdateRequest):
    """
    stop
    :summary: Stop a running task. Requires task status 'in_progress' and
              execution_progress 'running', or force=True.
              Development task is stopped immediately. For a non-development task
              only its status message is set to 'stopping'

    """
    call.result.data_model = UpdateResponse(
        **TaskBLL.stop_task(
            task_id=req_model.task,
            company_id=company_id,
            user_name=call.identity.user_name,
            status_reason=req_model.status_reason,
            force=req_model.force,
        )
    )


@endpoint(
    "tasks.stopped",
    request_data_model=UpdateRequest,
    response_data_model=UpdateResponse,
)
def stopped(call: APICall, company_id, req_model: UpdateRequest):
    call.result.data_model = UpdateResponse(
        **set_task_status_from_call(
            req_model,
            company_id,
            new_status=TaskStatus.stopped,
            completed=datetime.utcnow(),
        )
    )


@endpoint(
    "tasks.started",
    request_data_model=UpdateRequest,
    response_data_model=StartedResponse,
)
def started(call: APICall, company_id, req_model: UpdateRequest):
    res = StartedResponse(
        **set_task_status_from_call(
            req_model,
            company_id,
            new_status=TaskStatus.in_progress,
            min__started=datetime.utcnow(),  # don't override a previous, smaller "started" field value
        )
    )
    res.started = res.updated
    call.result.data_model = res


@endpoint(
    "tasks.failed", request_data_model=UpdateRequest, response_data_model=UpdateResponse
)
def failed(call: APICall, company_id, req_model: UpdateRequest):
    call.result.data_model = UpdateResponse(
        **set_task_status_from_call(req_model, company_id, new_status=TaskStatus.failed)
    )


@endpoint(
    "tasks.close", request_data_model=UpdateRequest, response_data_model=UpdateResponse
)
def close(call: APICall, company_id, req_model: UpdateRequest):
    call.result.data_model = UpdateResponse(
        **set_task_status_from_call(req_model, company_id, new_status=TaskStatus.closed)
    )


create_fields = {
    "name": None,
    "tags": list,
    "system_tags": list,
    "type": None,
    "error": None,
    "comment": None,
    "parent": Task,
    "project": None,
    "input": None,
    "output_dest": None,
    "execution": None,
    "hyperparams": None,
    "configuration": None,
    "script": None,
}


def prepare_for_save(call: APICall, fields: dict, previous_task: Task = None):
    conform_tag_fields(call, fields, validate=True)
    params_prepare_for_save(fields, previous_task=previous_task)
    artifacts_prepare_for_save(fields)

    # Strip all script fields (remove leading and trailing whitespace chars) to avoid unusable names and paths
    for field in task_script_stripped_fields:
        try:
            path = f"script/{field}"
            value = dpath.get(fields, path)
            if isinstance(value, str):
                value = value.strip()
            dpath.set(fields, path, value)
        except KeyError:
            pass

    return fields


def unprepare_from_saved(call: APICall, tasks_data: Union[Sequence[dict], dict]):
    if isinstance(tasks_data, dict):
        tasks_data = [tasks_data]

    conform_output_tags(call, tasks_data)

    for data in tasks_data:
        need_legacy_params = call.requested_endpoint_version < PartialVersion("2.9")
        params_unprepare_from_saved(
            fields=data, copy_to_legacy=need_legacy_params,
        )
        artifacts_unprepare_from_saved(fields=data)


def prepare_create_fields(
    call: APICall, valid_fields=None, output=None, previous_task: Task = None,
):
    valid_fields = valid_fields if valid_fields is not None else create_fields
    t_fields = task_fields
    t_fields.add("output_dest")

    fields = parse_from_call(call.data, valid_fields, t_fields)

    # Move output_dest to output.destination
    output_dest = fields.get("output_dest")
    if output_dest is not None:
        fields.pop("output_dest")
        if output:
            output.destination = output_dest
        else:
            output = Output(destination=output_dest)
        fields["output"] = output

    return prepare_for_save(call, fields, previous_task=previous_task)


def _validate_and_get_task_from_call(call: APICall, **kwargs) -> Tuple[Task, dict]:
    with translate_errors_context(
        field_does_not_exist_cls=errors.bad_request.ValidationError
    ), TimingContext("code", "parse_call"):
        fields = prepare_create_fields(call, **kwargs)
        task = task_bll.create(call, fields)

    with TimingContext("code", "validate"):
        task_bll.validate(task)

    return task, fields


@endpoint("tasks.validate", request_data_model=CreateRequest)
def validate(call: APICall, company_id, req_model: CreateRequest):
    _validate_and_get_task_from_call(call)


def _update_cached_tags(company: str, project: str, fields: dict):
    org_bll.update_tags(
        company,
        Tags.Task,
        project=project,
        tags=fields.get("tags"),
        system_tags=fields.get("system_tags"),
    )


def _reset_cached_tags(company: str, projects: Sequence[str]):
    org_bll.reset_tags(company, Tags.Task, projects=projects)


@endpoint(
    "tasks.create", request_data_model=CreateRequest, response_data_model=IdResponse
)
def create(call: APICall, company_id, req_model: CreateRequest):
    task, fields = _validate_and_get_task_from_call(call)

    with translate_errors_context(), TimingContext("mongo", "save_task"):
        task.save()
        _update_cached_tags(company_id, project=task.project, fields=fields)
        update_project_time(task.project)

    call.result.data_model = IdResponse(id=task.id)


@endpoint(
    "tasks.clone", request_data_model=CloneRequest, response_data_model=IdResponse
)
def clone_task(call: APICall, company_id, request: CloneRequest):
    validate_tags(request.new_task_tags, request.new_task_system_tags)
    task = task_bll.clone_task(
        company_id=company_id,
        user_id=call.identity.user,
        task_id=request.task,
        name=request.new_task_name,
        comment=request.new_task_comment,
        parent=request.new_task_parent,
        project=request.new_task_project,
        tags=request.new_task_tags,
        system_tags=request.new_task_system_tags,
        hyperparams=request.new_hyperparams,
        configuration=request.new_configuration,
        execution_overrides=request.execution_overrides,
        validate_references=request.validate_references,
        new_project_name=request.new_project_name,
    )
    call.result.data_model = IdResponse(id=task.id)


def prepare_update_fields(call: APICall, task, call_data):
    valid_fields = deepcopy(task.__class__.user_set_allowed())
    update_fields = {k: v for k, v in create_fields.items() if k in valid_fields}
    update_fields["output__error"] = None
    t_fields = task_fields
    t_fields.add("output__error")
    fields = parse_from_call(call_data, update_fields, t_fields)
    return prepare_for_save(call, fields), valid_fields


@endpoint(
    "tasks.update", request_data_model=UpdateRequest, response_data_model=UpdateResponse
)
def update(call: APICall, company_id, req_model: UpdateRequest):
    task_id = req_model.task

    with translate_errors_context():
        task = Task.get_for_writing(
            id=task_id, company=company_id, _only=["id", "project"]
        )
        if not task:
            raise errors.bad_request.InvalidTaskId(id=task_id)

        partial_update_dict, valid_fields = prepare_update_fields(call, task, call.data)

        if not partial_update_dict:
            return UpdateResponse(updated=0)

        updated_count, updated_fields = Task.safe_update(
            company_id=company_id,
            id=task_id,
            partial_update_dict=partial_update_dict,
        )
        if updated_count:
            new_project = updated_fields.get("project", task.project)
            if new_project != task.project:
                _reset_cached_tags(company_id, projects=[new_project, task.project])
            else:
                _update_cached_tags(
                    company_id, project=task.project, fields=updated_fields
                )
            update_project_time(updated_fields.get("project"))
        unprepare_from_saved(call, updated_fields)
        return UpdateResponse(updated=updated_count, fields=updated_fields)


@endpoint(
    "tasks.set_requirements",
    request_data_model=SetRequirementsRequest,
    response_data_model=UpdateResponse,
)
def set_requirements(call: APICall, company_id, req_model: SetRequirementsRequest):
    requirements = req_model.requirements
    with translate_errors_context():
        task = TaskBLL.get_task_with_access(
            req_model.task,
            company_id=company_id,
            only=("status", "script"),
            requires_write_access=True,
        )
        if not task.script:
            raise errors.bad_request.MissingTaskFields(
                "Task has no script field", task=task.id
            )
        res = task.update(
            script__requirements=requirements, last_update=datetime.utcnow()
        )
        call.result.data_model = UpdateResponse(updated=res)
        if res:
            call.result.data_model.fields = {"script.requirements": requirements}


@endpoint("tasks.update_batch")
def update_batch(call: APICall, company_id, _):
    items = call.batched_data
    if items is None:
        raise errors.bad_request.BatchContainsNoItems()

    with translate_errors_context():
        items = {i["task"]: i for i in items}
        tasks = {
            t.id: t
            for t in Task.get_many_for_writing(
                company=company_id, query=Q(id__in=list(items))
            )
        }

        if len(tasks) < len(items):
            missing = tuple(set(items).difference(tasks))
            raise errors.bad_request.InvalidTaskId(ids=missing)

        now = datetime.utcnow()

        bulk_ops = []
        updated_projects = set()
        for id, data in items.items():
            task = tasks[id]
            fields, valid_fields = prepare_update_fields(call, task, data)
            partial_update_dict = Task.get_safe_update_dict(fields)
            if not partial_update_dict:
                continue
            partial_update_dict.update(last_update=now)
            update_op = UpdateOne(
                {"_id": id, "company": company_id}, {"$set": partial_update_dict}
            )
            bulk_ops.append(update_op)

            new_project = partial_update_dict.get("project", task.project)
            if new_project != task.project:
                updated_projects.update({new_project, task.project})
            elif any(f in partial_update_dict for f in ("tags", "system_tags")):
                updated_projects.add(task.project)

        updated = 0
        if bulk_ops:
            res = Task._get_collection().bulk_write(bulk_ops)
            updated = res.modified_count

        if updated and updated_projects:
            _reset_cached_tags(company_id, projects=list(updated_projects))

        call.result.data = {"updated": updated}


@endpoint(
    "tasks.edit", request_data_model=UpdateRequest, response_data_model=UpdateResponse
)
def edit(call: APICall, company_id, req_model: UpdateRequest):
    task_id = req_model.task
    force = req_model.force

    with translate_errors_context():
        task = Task.get_for_writing(id=task_id, company=company_id)
        if not task:
            raise errors.bad_request.InvalidTaskId(id=task_id)

        if not force and task.status != TaskStatus.created:
            raise errors.bad_request.InvalidTaskStatus(
                expected=TaskStatus.created, status=task.status
            )

        edit_fields = create_fields.copy()
        edit_fields.update(dict(status=None))

        with translate_errors_context(
            field_does_not_exist_cls=errors.bad_request.ValidationError
        ), TimingContext("code", "parse_and_validate"):
            fields = prepare_create_fields(
                call, valid_fields=edit_fields, output=task.output, previous_task=task
            )

        for key in fields:
            field = getattr(task, key, None)
            value = fields[key]
            if (
                field
                and isinstance(value, dict)
                and isinstance(field, EmbeddedDocument)
            ):
                d = field.to_mongo(use_db_field=False).to_dict()
                d.update(value)
                fields[key] = d

        task_bll.validate(task_bll.create(call, fields))

        # make sure field names do not end in mongoengine comparison operators
        fixed_fields = {
            (k if k not in COMPARISON_OPERATORS else "%s__" % k): v
            for k, v in fields.items()
        }
        if fixed_fields:
            now = datetime.utcnow()
            fields.update(last_update=now)
            fixed_fields.update(last_update=now)
            updated = task.update(upsert=False, **fixed_fields)
            if updated:
                new_project = fixed_fields.get("project", task.project)
                if new_project != task.project:
                    _reset_cached_tags(company_id, projects=[new_project, task.project])
                else:
                    _update_cached_tags(
                        company_id, project=task.project, fields=fixed_fields
                    )
                update_project_time(fields.get("project"))
            unprepare_from_saved(call, fields)
            call.result.data_model = UpdateResponse(updated=updated, fields=fields)
        else:
            call.result.data_model = UpdateResponse(updated=0)


@endpoint(
    "tasks.get_hyper_params", request_data_model=GetHyperParamsRequest,
)
def get_hyper_params(call: APICall, company_id, request: GetHyperParamsRequest):
    with translate_errors_context():
        tasks_params = HyperParams.get_params(company_id, task_ids=request.tasks)

    call.result.data = {
        "params": [{"task": task, **data} for task, data in tasks_params.items()]
    }


@endpoint("tasks.edit_hyper_params", request_data_model=EditHyperParamsRequest)
def edit_hyper_params(call: APICall, company_id, request: EditHyperParamsRequest):
    with translate_errors_context():
        call.result.data = {
            "updated": HyperParams.edit_params(
                company_id,
                task_id=request.task,
                hyperparams=request.hyperparams,
                replace_hyperparams=request.replace_hyperparams,
                force=request.force,
            )
        }


@endpoint("tasks.delete_hyper_params", request_data_model=DeleteHyperParamsRequest)
def delete_hyper_params(call: APICall, company_id, request: DeleteHyperParamsRequest):
    with translate_errors_context():
        call.result.data = {
            "deleted": HyperParams.delete_params(
                company_id,
                task_id=request.task,
                hyperparams=request.hyperparams,
                force=request.force,
            )
        }


@endpoint(
    "tasks.get_configurations", request_data_model=GetConfigurationsRequest,
)
def get_configurations(call: APICall, company_id, request: GetConfigurationsRequest):
    with translate_errors_context():
        tasks_params = HyperParams.get_configurations(
            company_id, task_ids=request.tasks, names=request.names
        )

    call.result.data = {
        "configurations": [
            {"task": task, **data} for task, data in tasks_params.items()
        ]
    }


@endpoint(
    "tasks.get_configuration_names", request_data_model=GetConfigurationNamesRequest,
)
def get_configuration_names(
    call: APICall, company_id, request: GetConfigurationNamesRequest
):
    with translate_errors_context():
        tasks_params = HyperParams.get_configuration_names(
            company_id, task_ids=request.tasks
        )

    call.result.data = {
        "configurations": [
            {"task": task, **data} for task, data in tasks_params.items()
        ]
    }


@endpoint("tasks.edit_configuration", request_data_model=EditConfigurationRequest)
def edit_configuration(call: APICall, company_id, request: EditConfigurationRequest):
    with translate_errors_context():
        call.result.data = {
            "updated": HyperParams.edit_configuration(
                company_id,
                task_id=request.task,
                configuration=request.configuration,
                replace_configuration=request.replace_configuration,
                force=request.force,
            )
        }


@endpoint("tasks.delete_configuration", request_data_model=DeleteConfigurationRequest)
def delete_configuration(
    call: APICall, company_id, request: DeleteConfigurationRequest
):
    with translate_errors_context():
        call.result.data = {
            "deleted": HyperParams.delete_configuration(
                company_id,
                task_id=request.task,
                configuration=request.configuration,
                force=request.force,
            )
        }


@endpoint(
    "tasks.enqueue",
    request_data_model=EnqueueRequest,
    response_data_model=EnqueueResponse,
)
def enqueue(call: APICall, company_id, req_model: EnqueueRequest):
    task_id = req_model.task
    queue_id = req_model.queue
    status_message = req_model.status_message
    status_reason = req_model.status_reason

    if not queue_id:
        # try to get default queue
        queue_id = queue_bll.get_default(company_id).id

    with translate_errors_context():
        query = dict(id=task_id, company=company_id)
        task = Task.get_for_writing(
            _only=("type", "script", "execution", "status", "project", "id"), **query
        )
        if not task:
            raise errors.bad_request.InvalidTaskId(**query)

        res = EnqueueResponse(
            **ChangeStatusRequest(
                task=task,
                new_status=TaskStatus.queued,
                status_reason=status_reason,
                status_message=status_message,
                allow_same_state_transition=False,
            ).execute()
        )

        try:
            queue_bll.add_task(
                company_id=company_id, queue_id=queue_id, task_id=task.id
            )
        except Exception:
            # failed enqueueing, revert to previous state
            ChangeStatusRequest(
                task=task,
                current_status_override=TaskStatus.queued,
                new_status=task.status,
                force=True,
                status_reason="failed enqueueing",
            ).execute()
            raise

        # set the current queue ID in the task
        if task.execution:
            Task.objects(**query).update(execution__queue=queue_id, multi=False)
        else:
            Task.objects(**query).update(
                execution=Execution(queue=queue_id), multi=False
            )

        res.queued = 1
        res.fields.update(**{"execution.queue": queue_id})

        call.result.data_model = res


@endpoint(
    "tasks.dequeue",
    request_data_model=UpdateRequest,
    response_data_model=DequeueResponse,
)
def dequeue(call: APICall, company_id, request: UpdateRequest):
    task = TaskBLL.get_task_with_access(
        request.task,
        company_id=company_id,
        only=("id", "execution", "status", "project"),
        requires_write_access=True,
    )
    res = DequeueResponse(
        **TaskBLL.dequeue_and_change_status(
            task,
            company_id,
            status_message=request.status_message,
            status_reason=request.status_reason,
        )
    )

    res.dequeued = 1
    call.result.data_model = res


@endpoint(
    "tasks.reset", request_data_model=ResetRequest, response_data_model=ResetResponse
)
def reset(call: APICall, company_id, request: ResetRequest):
    task = TaskBLL.get_task_with_access(
        request.task, company_id=company_id, requires_write_access=True
    )

    force = request.force

    if not force and task.status == TaskStatus.published:
        raise errors.bad_request.InvalidTaskStatus(task_id=task.id, status=task.status)

    api_results = {}
    updates = {}

    try:
        dequeued = TaskBLL.dequeue(task, company_id, silent_fail=True)
    except APIError:
        # dequeue may fail if the task was not enqueued
        pass
    else:
        if dequeued:
            api_results.update(dequeued=dequeued)

    cleaned_up = cleanup_task(task, force)
    api_results.update(attr.asdict(cleaned_up))

    updates.update(
        set__last_iteration=DEFAULT_LAST_ITERATION,
        set__last_metrics={},
        set__metric_stats={},
        unset__output__result=1,
        unset__output__model=1,
        unset__output__error=1,
        unset__last_worker=1,
        unset__last_worker_report=1,
    )

    if request.clear_all:
        updates.update(
            set__execution=Execution(), unset__script=1,
        )
    else:
        updates.update(unset__execution__queue=1)
        if task.execution and task.execution.artifacts:
            updates.update(
                set__execution__artifacts={
                    key: artifact
                    for key, artifact in task.execution.artifacts.items()
                    if artifact.mode == ArtifactModes.input
                }
            )

    res = ResetResponse(
        **ChangeStatusRequest(
            task=task,
            new_status=TaskStatus.created,
            force=force,
            status_reason="reset",
            status_message="reset",
        ).execute(started=None, completed=None, published=None, active_duration=None, **updates)
    )

    # do not return artifacts since they are not serializable
    res.fields.pop("execution.artifacts", None)

    for key, value in api_results.items():
        setattr(res, key, value)

    call.result.data_model = res


@endpoint(
    "tasks.archive",
    request_data_model=ArchiveRequest,
    response_data_model=ArchiveResponse,
)
def archive(call: APICall, company_id, request: ArchiveRequest):
    archived = 0
    tasks = TaskBLL.assert_exists(
        company_id,
        task_ids=request.tasks,
        only=("id", "execution", "status", "project", "system_tags"),
    )
    for task in tasks:
        try:
            TaskBLL.dequeue_and_change_status(
                task,
                company_id,
                request.status_message,
                request.status_reason,
            )
        except APIError:
            # dequeue may fail if the task was not enqueued
            pass
        task.update(
            status_message=request.status_message,
            status_reason=request.status_reason,
            system_tags=sorted(
                set(task.system_tags) | {EntityVisibility.archived.value}
            ),
        )

        archived += 1

    call.result.data_model = ArchiveResponse(archived=archived)


class DocumentGroup(list):
    """
    Operate on a list of documents as if they were a query result
    """

    def __init__(self, document_type, documents):
        super(DocumentGroup, self).__init__(documents)
        self.type = document_type

    def objects(self, *args, **kwargs):
        return self.type.objects(id__in=[obj.id for obj in self], *args, **kwargs)


T = TypeVar("T")


class TaskOutputs(object):
    """
    Split task outputs of the same type by the ready state
    """

    published = None  # type: DocumentGroup
    draft = None  # type: DocumentGroup

    def __init__(self, is_published, document_type, children):
        # type: (Callable[[T], bool], Type[mongoengine.Document], Sequence[T]) -> ()
        """
        :param is_published: predicate returning whether items is considered published
        :param document_type: type of output
        :param children: output documents
        """
        self.published, self.draft = map(
            lambda x: DocumentGroup(document_type, x), split_by(is_published, children)
        )


@attr.s
class CleanupResult(object):
    """
    Counts of objects modified in task cleanup operation
    """

    updated_children = attr.ib(type=int)
    updated_models = attr.ib(type=int)
    deleted_models = attr.ib(type=int)


def cleanup_task(task: Task, force: bool = False):
    """
    Validate task deletion and delete/modify all its output.
    :param task: task object
    :param force: whether to delete task with published outputs
    :return: count of delete and modified items
    """
    models, child_tasks = get_outputs_for_deletion(task, force)
    deleted_task_id = trash_task_id(task.id)
    if child_tasks:
        with TimingContext("mongo", "update_task_children"):
            updated_children = child_tasks.update(parent=deleted_task_id)
    else:
        updated_children = 0

    if models.draft:
        with TimingContext("mongo", "delete_models"):
            deleted_models = models.draft.objects().delete()
    else:
        deleted_models = 0

    if models.published:
        with TimingContext("mongo", "update_task_models"):
            updated_models = models.published.objects().update(task=deleted_task_id)
    else:
        updated_models = 0

    event_bll.delete_task_events(task.company, task.id, allow_locked=force)

    return CleanupResult(
        deleted_models=deleted_models,
        updated_children=updated_children,
        updated_models=updated_models,
    )


def get_outputs_for_deletion(task, force=False):
    with TimingContext("mongo", "get_task_models"):
        models = TaskOutputs(
            attrgetter("ready"),
            Model,
            Model.objects(task=task.id).only("id", "task", "ready"),
        )
        if not force and models.published:
            raise errors.bad_request.TaskCannotBeDeleted(
                "has output models, use force=True",
                task=task.id,
                models=len(models.published),
            )

    if task.output.model:
        output_model = get_output_model(task, force)
        if output_model:
            if output_model.ready:
                models.published.append(output_model)
            else:
                models.draft.append(output_model)

    if models.draft:
        with TimingContext("mongo", "get_execution_models"):
            model_ids = [m.id for m in models.draft]
            dependent_tasks = Task.objects(execution__model__in=model_ids).only(
                "id", "execution.model"
            )
            busy_models = [t.execution.model for t in dependent_tasks]
            models.draft[:] = [m for m in models.draft if m.id not in busy_models]

    with TimingContext("mongo", "get_task_children"):
        tasks = Task.objects(parent=task.id).only("id", "parent", "status")
        published_tasks = [
            task for task in tasks if task.status == TaskStatus.published
        ]
        if not force and published_tasks:
            raise errors.bad_request.TaskCannotBeDeleted(
                "has children, use force=True", task=task.id, children=published_tasks
            )
    return models, tasks


def get_output_model(task, force=False):
    with TimingContext("mongo", "get_task_output_model"):
        output_model = Model.objects(id=task.output.model).first()
    if output_model and output_model.ready and not force:
        raise errors.bad_request.TaskCannotBeDeleted(
            "has output model, use force=True", task=task.id, model=task.output.model
        )
    return output_model


def trash_task_id(task_id):
    return "__DELETED__{}".format(task_id)


@endpoint("tasks.delete", request_data_model=DeleteRequest)
def delete(call: APICall, company_id, req_model: DeleteRequest):
    task = TaskBLL.get_task_with_access(
        req_model.task, company_id=company_id, requires_write_access=True
    )

    move_to_trash = req_model.move_to_trash
    force = req_model.force

    if task.status != TaskStatus.created and not force:
        raise errors.bad_request.TaskCannotBeDeleted(
            "due to status, use force=True",
            task=task.id,
            expected=TaskStatus.created,
            current=task.status,
        )

    with translate_errors_context():
        result = cleanup_task(task, force)

        if move_to_trash:
            collection_name = task._get_collection_name()
            archived_collection = "{}__trash".format(collection_name)
            task.switch_collection(archived_collection)
            try:
                # A simple save() won't do due to mongoengine caching (nothing will be saved), so we have to force
                # an insert. However, if for some reason such an ID exists, let's make sure we'll keep going.
                with TimingContext("mongo", "save_task"):
                    task.save(force_insert=True)
            except Exception:
                pass
            task.switch_collection(collection_name)

        task.delete()
        _reset_cached_tags(company_id, projects=[task.project])

        call.result.data = dict(deleted=True, **attr.asdict(result))


@endpoint(
    "tasks.publish",
    request_data_model=PublishRequest,
    response_data_model=PublishResponse,
)
def publish(call: APICall, company_id, req_model: PublishRequest):
    call.result.data_model = PublishResponse(
        **TaskBLL.publish_task(
            task_id=req_model.task,
            company_id=company_id,
            publish_model=req_model.publish_model,
            force=req_model.force,
            status_reason=req_model.status_reason,
            status_message=req_model.status_message,
        )
    )


@endpoint(
    "tasks.completed",
    min_version="2.2",
    request_data_model=UpdateRequest,
    response_data_model=UpdateResponse,
)
def completed(call: APICall, company_id, request: PublishRequest):
    call.result.data_model = UpdateResponse(
        **set_task_status_from_call(
            request,
            company_id,
            new_status=TaskStatus.completed,
            completed=datetime.utcnow(),
        )
    )


@endpoint("tasks.ping", request_data_model=PingRequest)
def ping(_, company_id, request: PingRequest):
    TaskBLL.set_last_update(
        task_ids=[request.task], company_id=company_id, last_update=datetime.utcnow()
    )


@endpoint(
    "tasks.add_or_update_artifacts",
    min_version="2.10",
    request_data_model=AddOrUpdateArtifactsRequest,
)
def add_or_update_artifacts(
    call: APICall, company_id, request: AddOrUpdateArtifactsRequest
):
    with translate_errors_context():
        call.result.data = {
            "updated": Artifacts.add_or_update_artifacts(
                company_id=company_id,
                task_id=request.task,
                artifacts=request.artifacts,
                force=request.force,
            )
        }


@endpoint(
    "tasks.delete_artifacts",
    min_version="2.10",
    request_data_model=DeleteArtifactsRequest,
)
def delete_artifacts(call: APICall, company_id, request: DeleteArtifactsRequest):
    with translate_errors_context():
        call.result.data = {
            "deleted": Artifacts.delete_artifacts(
                company_id=company_id,
                task_id=request.task,
                artifact_ids=request.artifacts,
                force=request.force,
            )
        }


@endpoint("tasks.make_public", min_version="2.9", request_data_model=MakePublicRequest)
def make_public(call: APICall, company_id, request: MakePublicRequest):
    with translate_errors_context():
        call.result.data = Task.set_public(
            company_id, request.ids, invalid_cls=InvalidTaskId, enabled=True
        )


@endpoint("tasks.make_private", min_version="2.9", request_data_model=MakePublicRequest)
def make_public(call: APICall, company_id, request: MakePublicRequest):
    with translate_errors_context():
        call.result.data = Task.set_public(
            company_id, request.ids, invalid_cls=InvalidTaskId, enabled=False
        )


@endpoint("tasks.move", request_data_model=MoveRequest)
def move(call: APICall, company_id: str, request: MoveRequest):
    if not (request.project or request.project_name):
        raise errors.bad_request.MissingRequiredFields(
            "project or project_name is required"
        )

    with translate_errors_context():
        return {
            "project_id": project_bll.move_under_project(
                entity_cls=Task,
                user=call.identity.user,
                company=company_id,
                ids=request.ids,
                project=request.project,
                project_name=request.project_name,
            )
        }