"""Add alerts table

Revision ID: 0007_add_alerts_table
Revises: 0006_add_host_metrics_details
Create Date: 2025-12-12

"""

from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


revision: str = '0007_add_alerts_table'
down_revision: Union[str, None] = '0006_add_host_metrics_details'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        'alerts',
        sa.Column('id', sa.Integer(), primary_key=True, autoincrement=True),
        sa.Column('user_id', sa.Integer(), sa.ForeignKey('users.id', ondelete='SET NULL'), nullable=True),
        sa.Column('category', sa.String(length=50), nullable=False),
        sa.Column('level', sa.String(length=20), nullable=True),
        sa.Column('title', sa.String(length=255), nullable=True),
        sa.Column('message', sa.Text(), nullable=False),
        sa.Column('source', sa.String(length=50), nullable=True),
        sa.Column('details', sa.JSON(), nullable=True),
        sa.Column('read_at', sa.DateTime(timezone=True), nullable=True),
        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('CURRENT_TIMESTAMP'), nullable=False),
    )

    op.create_index('idx_alerts_created_at', 'alerts', ['created_at'])
    op.create_index('idx_alerts_user_id', 'alerts', ['user_id'])
    op.create_index('idx_alerts_category', 'alerts', ['category'])
    op.create_index('idx_alerts_read_at', 'alerts', ['read_at'])


def downgrade() -> None:
    op.drop_index('idx_alerts_read_at', table_name='alerts')
    op.drop_index('idx_alerts_category', table_name='alerts')
    op.drop_index('idx_alerts_user_id', table_name='alerts')
    op.drop_index('idx_alerts_created_at', table_name='alerts')
    op.drop_table('alerts')