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"""Time grain SQLA

Revision ID: c5756bec8b47
Revises: e502db2af7be
Create Date: 2018-06-04 11:12:59.878742

"""

# revision identifiers, used by Alembic.
revision = 'c5756bec8b47'
down_revision = 'e502db2af7be'

from alembic import op
import json
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, Text

from superset import db

Base = declarative_base()


class Slice(Base):
    __tablename__ = 'slices'

    id = Column(Integer, primary_key=True)
    params = Column(Text)


def upgrade():
    bind = op.get_bind()
    session = db.Session(bind=bind)

    for slc in session.query(Slice).all():
        try:
            params = json.loads(slc.params)

            if params.get('time_grain_sqla') == 'Time Column':
                params['time_grain_sqla'] = None
                slc.params = json.dumps(params, sort_keys=True)
        except Exception:
            pass

    session.commit()
    session.close()


def downgrade():
    bind = op.get_bind()
    session = db.Session(bind=bind)

    for slc in session.query(Slice).all():
        try:
            params = json.loads(slc.params)

            if params.get('time_grain_sqla') is None:
                params['time_grain_sqla'] = 'Time Column'
                slc.params = json.dumps(params, sort_keys=True)
        except Exception:
            pass

    session.commit()
    session.close()
