import datetime
import os

from crc import db, app
from crc.models import StudyModel, WorkflowSpecModel, FileType, FileModel, FileDataModel


class ExampleDataLoader:
    def make_data(self):
        studies = [
            StudyModel(
                id=1,
                title='The impact of fried pickles on beer consumption in bipedal software developers.',
                last_updated=datetime.datetime.now(),
                protocol_builder_status='in_process',
                primary_investigator_id='dhf8r',
                sponsor='Sartography Pharmaceuticals',
                ind_number='1234'
            ),
            StudyModel(
                id=2,
                title='Requirement of hippocampal neurogenesis for the behavioral effects of soft pretzels',
                last_updated=datetime.datetime.now(),
                protocol_builder_status='in_process',
                primary_investigator_id='dhf8r',
                sponsor='Makerspace & Co.',
                ind_number='5678'
            ),
        ]

        workflow_specs = [WorkflowSpecModel(
            id="random_fact",
            display_name="Random Fact Generator",
            description='Displays a random fact about a topic of your choosing.',
        )]

        workflow_spec_files = [WorkflowSpecModel(
            id="random_fact",
            display_name="Random Fact Generator",
            description='Displays a random fact about a topic of your choosing.',
        )]

        workflow_spec_files = [FileModel(name="random_fact.bpmn",
                                         type=FileType.bpmn,
                                         version="1",
                                         last_updated=datetime.datetime.now(),
                                         primary=True,
                                         workflow_spec_id=workflow_specs[0].id)]

        filename = os.path.join(app.root_path, 'static', 'bpmn', 'random_fact', 'random_fact.bpmn')
        file = open(filename, "rb")
        workflow_data = [FileDataModel(data=file.read(), file_model=workflow_spec_files[0])]
        all_data = studies+workflow_specs+workflow_spec_files+workflow_data
        return all_data

    @staticmethod
    def clean_db():
        db.session.flush()  # Clear out any transactions before deleting it all to avoid spurious errors.
        for table in reversed(db.metadata.sorted_tables):
            db.session.execute(table.delete())
        db.session.flush()

    def load_all(self):
        db.session.add_all(self.make_data())
        db.session.commit()
        db.session.flush()