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

from pycs.database.Project import Project
from pycs.interfaces.MediaStorage import MediaStorage
from pycs.jobs.JobGroupBusyException import JobGroupBusyException
from pycs.jobs.JobRunner import JobRunner
from pycs.util.PipelineCache import PipelineCache


class FitModel(View):
    """
    use annotated data to fit a model
    """
    # pylint: disable=arguments-differ
    methods = ['POST']

    def __init__(self, pipelines: PipelineCache):
        # pylint: disable=invalid-name
        self.pipelines = pipelines

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

        if not data.get('fit', False):
            return abort(400)

        # find project
        project = Project.query.get(project_id)
        if project is None:
            return abort(404)

        # create job
        try:
            JobRunner.Run(project,
                          'Model Interaction',
                          f'{project.name} (fit model with new data)',
                          f'{project.name}/model-interaction',
                          self.load_and_fit, self.pipelines, project.id)
        except JobGroupBusyException:
            return abort(400)

        return make_response()

    @staticmethod
    def load_and_fit(pipelines: PipelineCache, project_id: int):
        """
        load the pipeline and call the fit function

        :param pipelines: pipeline cache
        :param project_id: project id
        """
        pipeline = None

        project = Project.query.get(project_id)
        storage = MediaStorage(project_id)

        # load pipeline
        try:
            pipeline = pipelines.load_from_root_folder(project)
            yield from pipeline.fit(storage)
        except TypeError:
            pass
        finally:
            if pipeline is not None:
                pipelines.free_instance(project)