"""ORM model definitions"""
from datetime import datetime
from typing import Optional, List
from sqlalchemy import String, Integer, Boolean, Float, Text, DateTime, ForeignKey
from sqlalchemy.orm import Mapped, mapped_column, relationship, DeclarativeBase


class Base(DeclarativeBase):
    pass


class Project(Base):
    """Project model"""
    __tablename__ = "projects"
    
    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    user_id: Mapped[int] = mapped_column(Integer, ForeignKey("users.id"), nullable=False)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    
    # Relationships
    user: Mapped["User"] = relationship("User", backref="projects")


class User(Base):
    """User model"""
    __tablename__ = "users"
    
    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    username: Mapped[str] = mapped_column(String(50), unique=True, nullable=False)
    email: Mapped[Optional[str]] = mapped_column(String(120), unique=True, nullable=True)
    password_hash: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
    role: Mapped[str] = mapped_column(String(20), default="user")
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    
    # Relationships
    conversations: Mapped[List["Conversation"]] = relationship(
        "Conversation", back_populates="user", cascade="all, delete-orphan"
    )
    
    def to_dict(self):
        return {
            "id": self.id,
            "username": self.username,
            "email": self.email,
            "role": self.role,
            "is_active": self.is_active,
            "created_at": self.created_at.isoformat() if self.created_at else None
        }


class Conversation(Base):
    """Conversation model"""
    __tablename__ = "conversations"
    
    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    user_id: Mapped[int] = mapped_column(Integer, ForeignKey("users.id"), nullable=False)
    project_id: Mapped[Optional[str]] = mapped_column(String(64), ForeignKey("projects.id"), nullable=True)
    title: Mapped[str] = mapped_column(String(255), nullable=False)
    model: Mapped[str] = mapped_column(String(64), nullable=False, default="deepseek-chat")
    system_prompt: Mapped[str] = mapped_column(Text, nullable=False, default="You are a helpful assistant.")
    temperature: Mapped[float] = mapped_column(Float, default=0.7)
    max_tokens: Mapped[int] = mapped_column(Integer, default=2000)
    thinking_enabled: Mapped[bool] = mapped_column(Boolean, default=False)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    
    # Relationships
    user: Mapped["User"] = relationship("User", back_populates="conversations")
    messages: Mapped[List["Message"]] = relationship(
        "Message", back_populates="conversation", cascade="all, delete-orphan"
    )
    
    def to_dict(self):
        return {
            "id": self.id,
            "user_id": self.user_id,
            "project_id": self.project_id,
            "title": self.title,
            "model": self.model,
            "system_prompt": self.system_prompt,
            "temperature": self.temperature,
            "max_tokens": self.max_tokens,
            "thinking_enabled": self.thinking_enabled,
            "created_at": self.created_at.isoformat() if self.created_at else None,
            "updated_at": self.updated_at.isoformat() if self.updated_at else None
        }


class Message(Base):
    """Message model"""
    __tablename__ = "messages"
    
    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    conversation_id: Mapped[str] = mapped_column(String(64), ForeignKey("conversations.id"), nullable=False)
    role: Mapped[str] = mapped_column(String(16), nullable=False)
    content: Mapped[str] = mapped_column(Text, nullable=False)
    token_count: Mapped[int] = mapped_column(Integer, default=0)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    
    # Relationships
    conversation: Mapped["Conversation"] = relationship("Conversation", back_populates="messages")
    
    def to_dict(self):
        return {
            "id": self.id,
            "conversation_id": self.conversation_id,
            "role": self.role,
            "content": self.content,
            "token_count": self.token_count,
            "created_at": self.created_at.isoformat() if self.created_at else None
        }