from datetime import datetime

from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, String, Text, func
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.db.base import Base


class ChatSession(Base):
    __tablename__ = "chat_sessions"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    title: Mapped[str] = mapped_column(String(255), default="Новый чат")
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )

    messages: Mapped[list["Message"]] = relationship(
        back_populates="session", cascade="all, delete-orphan", order_by="Message.created_at"
    )


class Message(Base):
    __tablename__ = "messages"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    session_id: Mapped[int] = mapped_column(ForeignKey("chat_sessions.id", ondelete="CASCADE"), index=True)
    role: Mapped[str] = mapped_column(String(32))
    content: Mapped[str] = mapped_column(Text, default="")
    tool_calls_json: Mapped[str | None] = mapped_column(Text, nullable=True)
    tool_call_id: Mapped[str | None] = mapped_column(String(64), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    session: Mapped["ChatSession"] = relationship(back_populates="messages")


class PomodoroSession(Base):
    __tablename__ = "pomodoro_sessions"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    status: Mapped[str] = mapped_column(String(32), default="idle")
    duration_min: Mapped[int] = mapped_column(Integer, default=25)
    task_note: Mapped[str] = mapped_column(Text, default="")
    result: Mapped[str | None] = mapped_column(Text, nullable=True)
    completed: Mapped[bool] = mapped_column(Boolean, default=False)
    started_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    paused_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    elapsed_seconds: Mapped[int] = mapped_column(Integer, default=0)
    finished_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())