from sqlalchemy import Column, String, Boolean, DateTime, ForeignKey, Enum as SQLEnum
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.sql import func
import uuid
import enum
from app.database import Base


class SharePermission(str, enum.Enum):
    """Permission levels for map sharing."""
    READ = "read"  # Read-only access
    EDIT = "edit"  # Can edit map items


class MapShare(Base):
    """Map sharing with specific users."""

    __tablename__ = "map_shares"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    map_id = Column(UUID(as_uuid=True), ForeignKey("maps.id", ondelete="CASCADE"), nullable=False, index=True)
    user_id = Column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    permission = Column(SQLEnum(SharePermission, values_callable=lambda x: [e.value for e in x]), nullable=False, default=SharePermission.READ)
    shared_by = Column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False)


class MapShareLink(Base):
    """Public/guest share links for maps."""

    __tablename__ = "map_share_links"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    map_id = Column(UUID(as_uuid=True), ForeignKey("maps.id", ondelete="CASCADE"), nullable=False, index=True)
    token = Column(String(64), unique=True, nullable=False, index=True)  # Random token for the share URL
    permission = Column(SQLEnum(SharePermission, values_callable=lambda x: [e.value for e in x]), nullable=False, default=SharePermission.READ)
    is_active = Column(Boolean, default=True, nullable=False)
    created_by = Column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    expires_at = Column(DateTime(timezone=True), nullable=True)  # Optional expiration
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False)