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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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"""Sync DB with the models.py.

Sqlite doesn't support alter on tables, that's why most of the operations
are surrounded with try except.

Revision ID: 3b626e2a6783
Revises: 5e4a03ef0bf0
Create Date: 2016-09-22 10:21:33.618976

"""
from alembic import op
from superset import db
from superset.utils.core import generic_find_constraint_name
import logging
import sqlalchemy as sa
from sqlalchemy.dialects import mysql

# revision identifiers, used by Alembic.
revision = '3b626e2a6783'
down_revision = 'eca4694defa7'


def upgrade():
    # cleanup after: https://github.com/airbnb/superset/pull/1078
    try:
        slices_ibfk_1 = generic_find_constraint_name(
            table='slices', columns={'druid_datasource_id'},
            referenced='datasources', db=db)
        slices_ibfk_2 = generic_find_constraint_name(
            table='slices', columns={'table_id'},
            referenced='tables', db=db)

        with op.batch_alter_table('slices') as batch_op:
            if slices_ibfk_1:
                batch_op.drop_constraint(slices_ibfk_1, type_='foreignkey')
            if slices_ibfk_2:
                batch_op.drop_constraint(slices_ibfk_2, type_='foreignkey')
            batch_op.drop_column('druid_datasource_id')
            batch_op.drop_column('table_id')
    except Exception as e:
        logging.warning(str(e))

    # fixed issue: https://github.com/airbnb/superset/issues/466
    try:
        with op.batch_alter_table('columns') as batch_op:
            batch_op.create_foreign_key(
                None, 'datasources', ['datasource_name'], ['datasource_name'])
    except Exception as e:
        logging.warning(str(e))
    try:
        with op.batch_alter_table('query') as batch_op:
            batch_op.create_unique_constraint('client_id', ['client_id'])
    except Exception as e:
        logging.warning(str(e))

    try:
        with op.batch_alter_table('query') as batch_op:
            batch_op.drop_column('name')
    except Exception as e:
        logging.warning(str(e))


def downgrade():
    try:
        with op.batch_alter_table('tables') as batch_op:
            batch_op.create_index('table_name', ['table_name'], unique=True)
    except Exception as e:
        logging.warning(str(e))

    try:
        with op.batch_alter_table('slices') as batch_op:
            batch_op.add_column(sa.Column(
                'table_id', mysql.INTEGER(display_width=11),
                autoincrement=False, nullable=True))
            batch_op.add_column(sa.Column(
                'druid_datasource_id', sa.Integer(), autoincrement=False,
                nullable=True))
            batch_op.create_foreign_key(
                'slices_ibfk_1', 'datasources', ['druid_datasource_id'],
                ['id'])
            batch_op.create_foreign_key(
                'slices_ibfk_2', 'tables', ['table_id'], ['id'])
    except Exception as e:
        logging.warning(str(e))

    try:
        fk_columns = generic_find_constraint_name(
            table='columns', columns={'datasource_name'},
            referenced='datasources', db=db)
        with op.batch_alter_table('columns') as batch_op:
            batch_op.drop_constraint(fk_columns, type_='foreignkey')
    except Exception as e:
        logging.warning(str(e))

    op.add_column(
        'query', sa.Column('name', sa.String(length=256), nullable=True))
    try:
        with op.batch_alter_table('query') as batch_op:
            batch_op.drop_constraint('client_id', type_='unique')
    except Exception as e:
        logging.warning(str(e))
