"""SQLAlchemy ORM models."""

import datetime
from enum import Enum

from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, String, Text, UniqueConstraint, func
from sqlalchemy.orm import Mapped, mapped_column, relationship

from guarddog_nexus.database import Base


class ScanStatus(str, Enum):
    PENDING = "pending"
    SCANNING = "scanning"
    COMPLETED = "completed"
    FAILED = "failed"


class Scan(Base):
    __tablename__ = "scans"
    __table_args__ = (
        UniqueConstraint("package_name", "package_version", "repository", name="uq_scan_pkg"),
    )

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    package_name: Mapped[str] = mapped_column(String(255), nullable=False)
    package_version: Mapped[str] = mapped_column(String(255), nullable=False)
    ecosystem: Mapped[str] = mapped_column(String(50), nullable=False, default="pypi")
    repository: Mapped[str] = mapped_column(String(255), nullable=False)
    nexus_asset_url: Mapped[str] = mapped_column(Text, nullable=False)
    sha256: Mapped[str | None] = mapped_column(String(64), nullable=True)
    status: Mapped[str] = mapped_column(
        String(20), nullable=False, default=ScanStatus.PENDING.value
    )
    total_findings: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    flagged: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    started_at: Mapped[datetime.datetime] = mapped_column(
        DateTime, nullable=False, default=func.now()
    )
    finished_at: Mapped[datetime.datetime | None] = mapped_column(DateTime, nullable=True)
    error_message: Mapped[str | None] = mapped_column(Text, nullable=True)

    findings: Mapped[list["Finding"]] = relationship(
        "Finding", back_populates="scan", cascade="all, delete-orphan"
    )


class Finding(Base):
    __tablename__ = "findings"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    scan_id: Mapped[int] = mapped_column(Integer, ForeignKey("scans.id"), nullable=False)
    rule: Mapped[str] = mapped_column(String(255), nullable=False)
    severity: Mapped[str] = mapped_column(String(50), nullable=False)
    message: Mapped[str] = mapped_column(Text, nullable=False)
    location: Mapped[str | None] = mapped_column(String(512), nullable=True)
    created_at: Mapped[datetime.datetime] = mapped_column(
        DateTime, nullable=False, default=func.now()
    )

    scan: Mapped["Scan"] = relationship("Scan", back_populates="findings")