from sqlalchemy import Boolean, Column, DateTime, ForeignKey, Integer, String, Text
from sqlalchemy.orm import relationship

from app.core.db import Base, utc_now


class Conversation(Base):
    __tablename__ = "conversations"

    id = Column(String, primary_key=True)
    user_id = Column(String, ForeignKey("users.id"), nullable=False)
    started_at = Column(DateTime(timezone=True), default=utc_now)
    last_message_at = Column(DateTime(timezone=True), nullable=True)
    ended_at = Column(DateTime(timezone=True), nullable=True)
    duration_seconds = Column(Integer, default=0)
    summary = Column(Text, nullable=True)
    status = Column(String, default="active")
    current_topic = Column(String, nullable=True)
    conversation_stage = Column(String, nullable=True)

    user = relationship("User", back_populates="conversations")
    segments = relationship(
        "Segment", back_populates="conversation", cascade="all, delete-orphan"
    )


class Segment(Base):
    __tablename__ = "segments"

    id = Column(String, primary_key=True)
    conversation_id = Column(String, ForeignKey("conversations.id"), nullable=False)
    audio_url = Column(String, nullable=True)
    transcript_text = Column(Text, nullable=False)
    created_at = Column(DateTime(timezone=True), default=utc_now)
    processed = Column(Boolean, default=False)
    topic_category = Column(String, nullable=True)
    agent_response = Column(Text, nullable=True)

    conversation = relationship("Conversation", back_populates="segments")