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"""Drop ``user`` and ``chart`` table

Revision ID: cf5dc11e79ad
Revises: 03afc6b6f902
Create Date: 2019-01-24 15:30:35.834740

"""
from __future__ import annotations

import sqlalchemy as sa
from alembic import op
from sqlalchemy import inspect
from sqlalchemy.dialects import mysql

# revision identifiers, used by Alembic.
revision = 'cf5dc11e79ad'
down_revision = '03afc6b6f902'
branch_labels = None
depends_on = None
airflow_version = '2.0.0'


def upgrade():
    # We previously had a KnownEvent's table, but we deleted the table without
    # a down migration to remove it (so we didn't delete anyone's data if they
    # were happening to use the feature.
    #
    # But before we can delete the users table we need to drop the FK

    conn = op.get_bind()
    inspector = inspect(conn)
    tables = inspector.get_table_names()

    if 'known_event' in tables:
        for fkey in inspector.get_foreign_keys(table_name="known_event", referred_table="users"):
            if fkey['name']:
                with op.batch_alter_table(table_name='known_event') as bop:
                    bop.drop_constraint(fkey['name'], type_="foreignkey")

    if "chart" in tables:
        op.drop_table(
            "chart",
        )

    if "users" in tables:
        op.drop_table("users")


def downgrade():
    conn = op.get_bind()

    op.create_table(
        'users',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('username', sa.String(length=250), nullable=True),
        sa.Column('email', sa.String(length=500), nullable=True),
        sa.Column('password', sa.String(255)),
        sa.Column('superuser', sa.Boolean(), default=False),
        sa.PrimaryKeyConstraint('id'),
        sa.UniqueConstraint('username'),
    )

    op.create_table(
        'chart',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('label', sa.String(length=200), nullable=True),
        sa.Column('conn_id', sa.String(length=250), nullable=False),
        sa.Column('user_id', sa.Integer(), nullable=True),
        sa.Column('chart_type', sa.String(length=100), nullable=True),
        sa.Column('sql_layout', sa.String(length=50), nullable=True),
        sa.Column('sql', sa.Text(), nullable=True),
        sa.Column('y_log_scale', sa.Boolean(), nullable=True),
        sa.Column('show_datatable', sa.Boolean(), nullable=True),
        sa.Column('show_sql', sa.Boolean(), nullable=True),
        sa.Column('height', sa.Integer(), nullable=True),
        sa.Column('default_params', sa.String(length=5000), nullable=True),
        sa.Column('x_is_date', sa.Boolean(), nullable=True),
        sa.Column('iteration_no', sa.Integer(), nullable=True),
        sa.Column('last_modified', sa.DateTime(), nullable=True),
        sa.ForeignKeyConstraint(
            ['user_id'],
            ['users.id'],
        ),
        sa.PrimaryKeyConstraint('id'),
    )

    if conn.dialect.name == 'mysql':
        conn.execute("SET time_zone = '+00:00'")
        op.alter_column(table_name='chart', column_name='last_modified', type_=mysql.TIMESTAMP(fsp=6))
    else:
        if conn.dialect.name in ('sqlite', 'mssql'):
            return

        if conn.dialect.name == 'postgresql':
            conn.execute("set timezone=UTC")

        op.alter_column(table_name='chart', column_name='last_modified', type_=sa.TIMESTAMP(timezone=True))
