"""Entity history table for undo/restore functionality.

Revision ID: 0025_entity_history
Revises: 0024_heartbeat_config
Create Date: 2026-07-23
"""

from __future__ import annotations

from typing import Sequence, Union

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

revision: str = "0025_entity_history"
down_revision: Union[str, None] = "0024_heartbeat_config"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "entity_history",
        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True),
        sa.Column("tenant_id", postgresql.UUID(as_uuid=True), sa.ForeignKey("tenants.id", ondelete="CASCADE"), nullable=False),
        sa.Column("user_id", postgresql.UUID(as_uuid=True), sa.ForeignKey("users.id", ondelete="SET NULL"), nullable=True),
        sa.Column("entity_type", sa.String(50), nullable=False),
        sa.Column("entity_id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column("action", sa.String(20), nullable=False),
        sa.Column("snapshot_before", postgresql.JSONB, nullable=True),
        sa.Column("snapshot_after", postgresql.JSONB, nullable=True),
        sa.Column("changes", postgresql.JSONB, nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
        sa.Column("updated_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
        sa.Column("deleted_at", sa.DateTime(timezone=True), nullable=True),
    )
    op.create_index("ix_entity_history_tenant_id", "entity_history", ["tenant_id"])
    op.create_index("ix_entity_history_entity_type", "entity_history", ["entity_type"])
    op.create_index("ix_entity_history_entity_id", "entity_history", ["entity_id"])
    op.create_index("ix_entity_history_user_id", "entity_history", ["user_id"])
    op.create_index("ix_entity_history_created_at", "entity_history", ["created_at"])
    op.create_index(
        "ix_entity_history_tenant_entity",
        "entity_history",
        ["tenant_id", "entity_type", "entity_id", "created_at"],
    )


def downgrade() -> None:
    op.drop_index("ix_entity_history_tenant_entity", table_name="entity_history")
    op.drop_index("ix_entity_history_created_at", table_name="entity_history")
    op.drop_index("ix_entity_history_user_id", table_name="entity_history")
    op.drop_index("ix_entity_history_entity_id", table_name="entity_history")
    op.drop_index("ix_entity_history_entity_type", table_name="entity_history")
    op.drop_index("ix_entity_history_tenant_id", table_name="entity_history")
    op.drop_table("entity_history")