import uuid
from datetime import datetime
from typing import Optional, Any
from sqlalchemy import String, Text, DateTime, ForeignKey, Boolean, Integer, Index
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.dialects.postgresql import UUID, JSONB
from app.core.database import Base


class Tree(Base):
    __tablename__ = "trees"

    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)
    description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    category: Mapped[Optional[str]] = mapped_column(String(100), nullable=True, index=True)
    tree_structure: Mapped[dict[str, Any]] = mapped_column(JSONB, nullable=False)
    author_id: Mapped[Optional[uuid.UUID]] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("users.id"),
        nullable=True
    )
    team_id: Mapped[Optional[uuid.UUID]] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("teams.id"),
        nullable=True,
        index=True
    )
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    version: Mapped[int] = mapped_column(Integer, default=1)
    created_at: Mapped[datetime] = mapped_column(
        DateTime,
        default=datetime.utcnow
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime,
        default=datetime.utcnow,
        onupdate=datetime.utcnow
    )
    usage_count: Mapped[int] = mapped_column(Integer, default=0)

    # Relationships
    author: Mapped[Optional["User"]] = relationship("User", back_populates="trees")
    team: Mapped[Optional["Team"]] = relationship("Team", back_populates="trees")
    sessions: Mapped[list["Session"]] = relationship("Session", back_populates="tree")

    # Full-text search index will be created in migration