"""E2 B21: аудит (audit_events + audit_changes, immutable, 90 дней).

Revision ID: 008_e2_audit
Revises: 007_e1_rbac
"""
from __future__ import annotations

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

revision = '008_e2_audit'
down_revision = '007_e1_rbac'
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.create_table(
        'audit_events',
        sa.Column('id', pg.UUID(as_uuid=True), primary_key=True,
                  server_default=sa.text('gen_random_uuid()')),
        sa.Column('user_id', pg.UUID(as_uuid=True), sa.ForeignKey('users.id', ondelete='SET NULL')),
        sa.Column('username', sa.String(100)),
        sa.Column('event_type', sa.String(40), nullable=False),
        sa.Column('object_type', sa.String(40)),
        sa.Column('object_id', sa.String(64)),
        sa.Column('ip_address', sa.String(64)),
        sa.Column('user_agent', sa.String(255)),
        sa.Column('details', sa.JSON().with_variant(pg.JSONB(), 'postgresql')),
        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('NOW()')),
    )
    op.create_index('idx_audit_events_created', 'audit_events', ['created_at'])
    op.create_table(
        'audit_changes',
        sa.Column('id', pg.UUID(as_uuid=True), primary_key=True,
                  server_default=sa.text('gen_random_uuid()')),
        sa.Column('event_id', pg.UUID(as_uuid=True),
                  sa.ForeignKey('audit_events.id', ondelete='CASCADE'), nullable=False),
        sa.Column('field_name', sa.String(100), nullable=False),
        sa.Column('old_value', sa.Text()),
        sa.Column('new_value', sa.Text()),
    )
    op.create_index('idx_audit_changes_event', 'audit_changes', ['event_id'])


def downgrade() -> None:
    op.drop_index('idx_audit_changes_event', table_name='audit_changes')
    op.drop_table('audit_changes')
    op.drop_index('idx_audit_events_created', table_name='audit_events')
    op.drop_table('audit_events')