from __future__ import annotations

from datetime import datetime
from typing import Any

from sqlalchemy import DateTime, ForeignKey, Index, String
from sqlalchemy.types import JSON
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.sql import func

from app.models.base import BaseModel, ID_TYPE


class AuditLog(BaseModel):
    __tablename__ = "audit_logs"
    __table_args__ = (
        Index("idx_audit_logs_created_at", "created_at"),
        Index("idx_audit_logs_actor_created_at", "actor_user_id", "created_at"),
        Index("idx_audit_logs_action_created_at", "action_type", "created_at"),
        Index("idx_audit_logs_target", "target_type", "target_id", "created_at"),
    )

    id: Mapped[int] = mapped_column(ID_TYPE, primary_key=True)
    actor_user_id: Mapped[int | None] = mapped_column(
        ID_TYPE,
        ForeignKey("accounts.id", ondelete="SET NULL"),
        nullable=True,
    )
    actor_username: Mapped[str] = mapped_column(String(64), nullable=False)
    actor_display_name: Mapped[str | None] = mapped_column(String(64), nullable=True)
    action_type: Mapped[str] = mapped_column(String(32), nullable=False)
    target_type: Mapped[str] = mapped_column(String(32), nullable=False)
    target_id: Mapped[int | None] = mapped_column(ID_TYPE, nullable=True)
    target_display_name: Mapped[str | None] = mapped_column(String(128), nullable=True)
    before_data_json: Mapped[dict[str, object] | list[object] | None] = mapped_column(JSON, nullable=True)
    after_data_json: Mapped[dict[str, object] | list[object] | None] = mapped_column(JSON, nullable=True)
    request_path: Mapped[str | None] = mapped_column(String(255), nullable=True)
    request_method: Mapped[str | None] = mapped_column(String(16), nullable=True)
    ip_address: Mapped[str | None] = mapped_column(String(45), nullable=True)
    user_agent: Mapped[str | None] = mapped_column(String(512), nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime,
        nullable=False,
        server_default=func.now(),
    )

    actor: Mapped[Any] = relationship("Account", back_populates="audit_logs")