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"""Add sensor_instance table

Revision ID: e38be357a868
Revises: 8d48763f6d53
Create Date: 2019-06-07 04:03:17.003939

"""
import sqlalchemy as sa
from alembic import op
from sqlalchemy import func
from sqlalchemy.dialects import mysql
from sqlalchemy.engine.reflection import Inspector

from airflow.models.base import COLLATION_ARGS

# revision identifiers, used by Alembic.
revision = 'e38be357a868'
down_revision = '8d48763f6d53'
branch_labels = None
depends_on = None


def mssql_timestamp():
    return sa.DateTime()


def mysql_timestamp():
    return mysql.TIMESTAMP(fsp=6)


def sa_timestamp():
    return sa.TIMESTAMP(timezone=True)


def upgrade():

    conn = op.get_bind()
    inspector = Inspector.from_engine(conn)
    tables = inspector.get_table_names()
    if 'sensor_instance' in tables:
        return

    if conn.dialect.name == 'mysql':
        timestamp = mysql_timestamp
    elif conn.dialect.name == 'mssql':
        timestamp = mssql_timestamp
    else:
        timestamp = sa_timestamp

    op.create_table(
        'sensor_instance',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('task_id', sa.String(length=250, **COLLATION_ARGS), nullable=False),
        sa.Column('dag_id', sa.String(length=250, **COLLATION_ARGS), nullable=False),
        sa.Column('execution_date', timestamp(), nullable=False),
        sa.Column('state', sa.String(length=20), nullable=True),
        sa.Column('try_number', sa.Integer(), nullable=True),
        sa.Column('start_date', timestamp(), nullable=True),
        sa.Column('operator', sa.String(length=1000), nullable=False),
        sa.Column('op_classpath', sa.String(length=1000), nullable=False),
        sa.Column('hashcode', sa.BigInteger(), nullable=False),
        sa.Column('shardcode', sa.Integer(), nullable=False),
        sa.Column('poke_context', sa.Text(), nullable=False),
        sa.Column('execution_context', sa.Text(), nullable=True),
        sa.Column('created_at', timestamp(), default=func.now(), nullable=False),
        sa.Column('updated_at', timestamp(), default=func.now(), nullable=False),
        sa.PrimaryKeyConstraint('id'),
    )
    op.create_index('ti_primary_key', 'sensor_instance', ['dag_id', 'task_id', 'execution_date'], unique=True)
    op.create_index('si_hashcode', 'sensor_instance', ['hashcode'], unique=False)
    op.create_index('si_shardcode', 'sensor_instance', ['shardcode'], unique=False)
    op.create_index('si_state_shard', 'sensor_instance', ['state', 'shardcode'], unique=False)
    op.create_index('si_updated_at', 'sensor_instance', ['updated_at'], unique=False)


def downgrade():
    conn = op.get_bind()
    inspector = Inspector.from_engine(conn)
    tables = inspector.get_table_names()
    if 'sensor_instance' in tables:
        op.drop_table('sensor_instance')