"""Improve operation scheduling.

Revision ID: 144929e0f5f
Revises: None
Create Date: 2015-07-17 15:04:01.002581

"""

# revision identifiers, used by Alembic.
revision = '144929e0f5f'
down_revision = None

from alembic import op
import sqlalchemy as sa

from accountant.api.models.scheduled_operations import ScheduledOperation


def upgrade():
    op.get_bind().execute("DROP VIEW operation")
    op.rename_table('entry', 'operation')

    # Add column "canceled" in table "entry"
    op.add_column(
        'operation',
        sa.Column(
            'canceled',
            sa.Boolean(),
            nullable=False,
            default=False,
            server_default=sa.false()
        )
    )

    # Add column "confirmed" in table "entry"
    op.add_column(
        'operation',
        sa.Column(
            'confirmed',
            sa.Boolean(),
            nullable=False,
            default=True,
            server_default=sa.true()
        )
    )

    # Drop unused table canceled_operation.
    op.drop_table('canceled_operation')

    op.get_bind().execute(
        "alter sequence entry_id_seq rename to operation_id_seq"
    )

    connection = op.get_bind()
    Session = sa.orm.sessionmaker()
    session = Session(bind=connection)

    # Get all scheduled operations
    scheduled_operations = ScheduledOperation.query(session).all()

    for scheduled_operation in scheduled_operations:
        scheduled_operation.reschedule(session)


def downgrade():

    op.create_table(
        "canceled_operation",
        sa.Column("id", sa.Integer, primary_key=True),
        sa.Column(
            "scheduled_operation_id", sa.Integer(),
            sa.ForeignKey("scheduled_operation.id")),
        sa.Column("operation_date", sa.Date, nullable=False)
    )

    op.drop_column('operation', 'canceled')
    op.drop_column('operation', 'confirmed')

    op.get_bind().execute(
        "alter sequence operation_id_seq rename to entry_id_seq"
    )
    op.rename_table('operation', 'entry')

    op.get_bind().execute(
        """
CREATE VIEW operation AS
SELECT entry.id,
    entry.operation_date,
    entry.label,
    entry.value,
    entry.account_id,
    entry.category,
    entry.pointed,
    entry.scheduled_operation_id,
    false AS canceled
FROM entry
UNION
SELECT NULL::bigint AS id,
    scheduled_operation.operation_date,
    scheduled_operation.label,
    scheduled_operation.value,
    scheduled_operation.account_id,
    scheduled_operation.category,
    false AS pointed,
    scheduled_operation.id AS scheduled_operation_id,
    false AS canceled
FROM (
    SELECT scheduled_operation_1.id,
           scheduled_operation_1.start_date,
           scheduled_operation_1.stop_date,
           scheduled_operation_1.day,
           scheduled_operation_1.frequency,
           scheduled_operation_1.label,
           scheduled_operation_1.value,
           scheduled_operation_1.account_id,
           scheduled_operation_1.category,
           generate_series(scheduled_operation_1.start_date::timestamp without time zone, scheduled_operation_1.stop_date::timestamp without time zone, scheduled_operation_1.frequency::double precision * '1 mon'::interval) AS operation_date
    FROM scheduled_operation scheduled_operation_1) scheduled_operation
    LEFT JOIN (
        SELECT entry.scheduled_operation_id,
               date_trunc('MONTH'::text, entry.operation_date::timestamp with time zone) AS operation_date
        FROM entry
        UNION
        SELECT canceled_operation.scheduled_operation_id,
               date_trunc('MONTH'::text, canceled_operation.operation_date::timestamp with time zone) AS operation_date
        FROM canceled_operation
    ) saved_operation ON saved_operation.scheduled_operation_id = scheduled_operation.id AND saved_operation.operation_date = date_trunc('MONTH'::text, scheduled_operation.operation_date)
WHERE saved_operation.scheduled_operation_id IS NULL
UNION
SELECT NULL::bigint AS id,
    canceled_operation.operation_date,
    scheduled_operation.label,
    scheduled_operation.value,
    scheduled_operation.account_id,
    scheduled_operation.category,
    false AS pointed,
    scheduled_operation.id AS scheduled_operation_id,
    true AS canceled
FROM scheduled_operation
JOIN canceled_operation ON canceled_operation.scheduled_operation_id = scheduled_operation.id;
        """
    )