import uuid
from datetime import datetime, timezone

from sqlalchemy import Boolean, DateTime, ForeignKey, String, Text
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.database import Base


def utcnow():
    return datetime.now(timezone.utc)


class AnomalyFlag(Base):
    __tablename__ = "anomaly_flags"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    completion_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("activity_completions.id"))
    flag_type: Mapped[str] = mapped_column(String(50), nullable=False)
    severity: Mapped[str] = mapped_column(String(20), default="warning")
    description: Mapped[str] = mapped_column(Text, nullable=False)
    auto_detected: Mapped[bool] = mapped_column(Boolean, default=True)
    resolved: Mapped[bool] = mapped_column(Boolean, default=False)
    resolved_by: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"))
    resolved_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    resolution_note: Mapped[str | None] = mapped_column(Text)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow)


class VerificationRequest(Base):
    __tablename__ = "verification_requests"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    completion_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("activity_completions.id", ondelete="CASCADE"), nullable=False)
    user_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=False)
    evidence_url: Mapped[str | None] = mapped_column(Text)
    evidence_type: Mapped[str | None] = mapped_column(String(50))
    notes: Mapped[str | None] = mapped_column(Text)
    status: Mapped[str] = mapped_column(String(30), default="pending")
    reviewed_by: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"))
    reviewed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    review_note: Mapped[str | None] = mapped_column(Text)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow)