"""Create users and tasks tables

Revision ID: 001_initial
Revises:
Create Date: 2026-01-08

"""
from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects import postgresql

# revision identifiers, used by Alembic.
revision = '001_initial'
down_revision = None
branch_labels = None
depends_on = None


def upgrade() -> None:
    # Create users table
    op.create_table(
        'users',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('email', sa.String(length=255), nullable=False),
        sa.Column('name', sa.String(length=100), nullable=False),
        sa.Column('created_at', sa.DateTime(), nullable=False),
        sa.Column('updated_at', sa.DateTime(), nullable=False),
        sa.PrimaryKeyConstraint('id')
    )
    op.create_index('ix_users_email', 'users', ['email'], unique=True)

    # Create tasks table
    op.create_table(
        'tasks',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('user_id', sa.Integer(), nullable=False),
        sa.Column('title', sa.String(length=200), nullable=False),
        sa.Column('description', sa.String(length=1000), nullable=True),
        sa.Column('completed', sa.Boolean(), nullable=False, server_default='false'),
        sa.Column('created_at', sa.DateTime(), nullable=False),
        sa.Column('updated_at', sa.DateTime(), nullable=False),
        sa.ForeignKeyConstraint(['user_id'], ['users.id'], ondelete='CASCADE'),
        sa.PrimaryKeyConstraint('id')
    )

    # Create indexes for tasks table
    op.create_index('ix_tasks_user_id', 'tasks', ['user_id'])
    op.create_index('ix_tasks_completed', 'tasks', ['completed'])
    op.create_index('ix_tasks_user_id_completed', 'tasks', ['user_id', 'completed'])
    op.create_index('ix_tasks_created_at', 'tasks', ['created_at'])


def downgrade() -> None:
    # Drop indexes
    op.drop_index('ix_tasks_created_at', table_name='tasks')
    op.drop_index('ix_tasks_user_id_completed', table_name='tasks')
    op.drop_index('ix_tasks_completed', table_name='tasks')
    op.drop_index('ix_tasks_user_id', table_name='tasks')

    # Drop tables
    op.drop_table('tasks')
    op.drop_index('ix_users_email', table_name='users')
    op.drop_table('users')