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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#
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"""fix_past_scripts_discrepancies

Revision ID: 014
Revises: 013
Create Date: 2016-08-07 13:12:34.958845

"""

# revision identifiers, used by Alembic.
revision = '014'
down_revision = '013'

from alembic import op
from sqlalchemy.dialects import mysql
from sqlalchemy.engine import reflection


def upgrade():

    inspect = reflection.Inspector.from_engine(op.get_bind())
    ct_unique_constraints = [
        uc['name'] for uc in inspect.get_unique_constraints('cron_triggers_v2')
    ]

    # unique constraint was added in 001, 002 and 003 with slight variations
    # without deleting the previous ones.
    # here we try to delete all three in case they exist
    if 'workflow_input_hash' in ct_unique_constraints:
        op.drop_index('workflow_input_hash', table_name='cron_triggers_v2')
    if 'workflow_input_hash_2' in ct_unique_constraints:
        op.drop_index('workflow_input_hash_2', table_name='cron_triggers_v2')
    if 'workflow_input_hash_3' in ct_unique_constraints:
        op.drop_index('workflow_input_hash_3', table_name='cron_triggers_v2')

    # create the correct latest unique constraint for table cron_triggers_v2
    op.create_unique_constraint(
        None,
        'cron_triggers_v2', [
            'workflow_input_hash', 'workflow_name', 'pattern',
            'project_id', 'workflow_params_hash', 'remaining_executions',
            'first_execution_time'
        ]
    )

    # column was added in 012. nullable value does not match today's model.
    op.alter_column(
        'event_triggers_v2',
        'workflow_id',
        existing_type=mysql.VARCHAR(length=36),
        nullable=True
    )

    # column was added in 010. nullable value does not match today's model
    op.alter_column(
        'resource_members_v2',
        'project_id',
        existing_type=mysql.VARCHAR(length=80),
        nullable=True
    )

Fix past migration scripts discrepancies
Fix past migration scripts discrepancies

It is important that running all migration scripts from first to last
will give the expected model.

This fix is a first step. It fixes all discrepancies from previous
scripts.

There are still changes in the model that needs to have a migration
script written for them, but that is not handled now.

Change-Id: Ie4079eecef6766ed91c210ccefa058175e0f22d0
