"""Initial tables

Revision ID: 001
Revises:
Create Date: 2023-07-01

"""
import sqlalchemy as sa
from alembic import op

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


def upgrade():
    # Create enum types
    task_status = sa.Enum(
        'todo', 'in_progress', 'completed', 'cancelled',
        name='taskstatus'
    )
    task_priority = sa.Enum('low', 'medium', 'high', 'urgent', name='taskpriority')

    # Create tables
    op.create_table(
        'users',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('email', sa.String(), nullable=False),
        sa.Column('username', sa.String(), nullable=False),
        sa.Column('hashed_password', sa.String(), nullable=False),
        sa.Column('full_name', sa.String(), nullable=True),
        sa.Column('is_active', sa.Boolean(), default=True),
        sa.Column('is_superuser', sa.Boolean(), default=False),
        sa.Column('created_at', sa.DateTime(), default=sa.func.now()),
        sa.Column('updated_at', sa.DateTime(),
                  default=sa.func.now(), onupdate=sa.func.now()),
        sa.PrimaryKeyConstraint('id'),
        sa.UniqueConstraint('email'),
        sa.UniqueConstraint('username')
    )
    op.create_index(op.f('ix_users_id'), 'users', ['id'], unique=False)
    op.create_index(op.f('ix_users_email'), 'users', ['email'], unique=True)
    op.create_index(op.f('ix_users_username'), 'users', ['username'], unique=True)

    op.create_table(
        'tasks',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('title', sa.String(255), nullable=False),
        sa.Column('description', sa.Text(), nullable=True),
        sa.Column('status', task_status, nullable=False, default='todo'),
        sa.Column('priority', task_priority, nullable=False, default='medium'),
        sa.Column('due_date', sa.DateTime(), nullable=True),
        sa.Column('owner_id', sa.Integer(), nullable=False),
        sa.Column('is_deleted', sa.Boolean(), default=False),
        sa.Column('created_at', sa.DateTime(), default=sa.func.now()),
        sa.Column('updated_at', sa.DateTime(),
                  default=sa.func.now(), onupdate=sa.func.now()),
        sa.Column('completed_at', sa.DateTime(), nullable=True),
        sa.ForeignKeyConstraint(['owner_id'], ['users.id'], ),
        sa.PrimaryKeyConstraint('id')
    )
    op.create_index(op.f('ix_tasks_id'), 'tasks', ['id'], unique=False)
    op.create_index(op.f('ix_tasks_title'), 'tasks', ['title'], unique=False)

    op.create_table(
        'task_assignments',
        sa.Column('task_id', sa.Integer(), nullable=False),
        sa.Column('user_id', sa.Integer(), nullable=False),
        sa.Column('assigned_at', sa.DateTime(), default=sa.func.now()),
        sa.ForeignKeyConstraint(['task_id'], ['tasks.id'], ),
        sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
        sa.PrimaryKeyConstraint('task_id', 'user_id')
    )


def downgrade():
    # Drop tables
    op.drop_table('task_assignments')
    op.drop_table('tasks')
    op.drop_table('users')

    # Drop enum types
    op.execute('DROP TYPE taskstatus')
    op.execute('DROP TYPE taskpriority')