import uuid
from datetime import datetime, timezone
from typing import Optional, TYPE_CHECKING
from sqlalchemy import String, DateTime, ForeignKey, Boolean
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.dialects.postgresql import UUID
from app.core.database import Base

if TYPE_CHECKING:
    from app.models.user import User
    from app.models.subscription import Subscription
    from app.models.tree import Tree
    from app.models.category import TreeCategory
    from app.models.tag import TreeTag
    from app.models.step_category import StepCategory
    from app.models.step_library import StepLibrary
    from app.models.account_limit_override import AccountLimitOverride


class Account(Base):
    __tablename__ = "accounts"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    display_code: Mapped[str] = mapped_column(String(8), unique=True, nullable=False)
    owner_id: Mapped[Optional[uuid.UUID]] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="RESTRICT"), nullable=True)
    stripe_customer_id: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc))
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc))
    allow_public_shares: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        default=True,
        server_default="true",
        comment="Policy: engineers can create public shares. Only affects NEW shares (grandfathered)."
    )

    # Relationships
    owner: Mapped["User"] = relationship("User", foreign_keys=[owner_id], back_populates="owned_account")
    users: Mapped[list["User"]] = relationship("User", foreign_keys="[User.account_id]", back_populates="account")
    subscription: Mapped[Optional["Subscription"]] = relationship("Subscription", back_populates="account", uselist=False)
    trees: Mapped[list["Tree"]] = relationship("Tree", foreign_keys="[Tree.account_id]", back_populates="account")
    categories: Mapped[list["TreeCategory"]] = relationship("TreeCategory", foreign_keys="[TreeCategory.account_id]", back_populates="account")
    tags: Mapped[list["TreeTag"]] = relationship("TreeTag", foreign_keys="[TreeTag.account_id]", back_populates="account")
    step_categories: Mapped[list["StepCategory"]] = relationship("StepCategory", foreign_keys="[StepCategory.account_id]", back_populates="account")
    step_library: Mapped[list["StepLibrary"]] = relationship("StepLibrary", foreign_keys="[StepLibrary.account_id]", back_populates="account")
    limit_override: Mapped[Optional["AccountLimitOverride"]] = relationship("AccountLimitOverride", back_populates="account", uselist=False)