"""
Modello AuditLog – immutabile per compliance e tracciabilità.
"""

import uuid
from datetime import datetime

from sqlalchemy import (
    BigInteger,
    DateTime,
    ForeignKey,
    Index,
    String,
    Text,
    func,
)
from sqlalchemy.dialects.postgresql import INET, JSONB, UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.database import Base


class AuditLog(Base):
    __tablename__ = "audit_log"

    id: Mapped[int] = mapped_column(BigInteger, primary_key=True, autoincrement=True)
    tenant_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("tenants.id"), nullable=True
    )
    user_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("users.id"), nullable=True
    )
    action: Mapped[str] = mapped_column(String(100), nullable=False)
    resource_type: Mapped[str | None] = mapped_column(String(100), nullable=True)
    resource_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), nullable=True)
    ip_address: Mapped[str | None] = mapped_column(INET, nullable=True)
    user_agent: Mapped[str | None] = mapped_column(Text, nullable=True)
    payload: Mapped[dict | None] = mapped_column(JSONB, nullable=True)
    outcome: Mapped[str] = mapped_column(String(20), nullable=False, default="success")
    occurred_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )

    __table_args__ = (
        Index("idx_audit_tenant_date", "tenant_id", "occurred_at"),
        Index("idx_audit_user", "user_id", "occurred_at"),
        Index("idx_audit_action", "action"),
    )

    def __repr__(self) -> str:
        return f"<AuditLog {self.action!r} user={self.user_id} outcome={self.outcome!r}>"
