from flask import request, abort, make_response
from flask.views import View

from pycs import db
from pycs.database.Project import Project
from pycs.database.Label import Label
from pycs.frontend.notifications.NotificationManager import NotificationManager


class RemoveLabel(View):
    """
    remove a label from database
    """
    # pylint: disable=arguments-differ
    methods = ['POST']


    def dispatch_request(self, project_id: int, label_id: int):
        # extract request data
        data = request.get_json(force=True)

        if not data.get('remove', False):
            abort(400, "\"remove\" command was not found!")

        # find project
        project = Project.query.get(project_id)
        if project is None:
            abort(404, f"Project with id {project_id} not found")

        # find label
        label = project.label(label_id)
        if label is None:
            abort(404, f"Label with id {label_id} not found")

        # start transaction
        with db.session.begin_nested():
            # remove children's parent entry
            for child in label.children:
                child.set_parent(None, commit=False)
                NotificationManager.edited("label", child.id, Label)

        # remove label
        label.remove()
        NotificationManager.removed("label", label.serialize())

        # return success response
        return make_response()