"""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

from luxx.database import Base


def local_now():
    return datetime.now()


class LLMProvider(Base):
    """LLM Provider configuration model"""
    __tablename__ = "llm_providers"
    
    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    user_id: Mapped[int] = mapped_column(Integer, ForeignKey("users.id"), nullable=False)
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    provider_type: Mapped[str] = mapped_column(String(50), nullable=False, default="openai")
    base_url: Mapped[str] = mapped_column(String(500), nullable=False)
    api_key: Mapped[str] = mapped_column(String(500), nullable=False)
    default_model: Mapped[str] = mapped_column(String(100), nullable=False, default="gpt-4")
    max_tokens: Mapped[int] = mapped_column(Integer, default=8192)
    is_default: Mapped[bool] = mapped_column(Boolean, default=False)
    enabled: Mapped[bool] = mapped_column(Boolean, default=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=local_now)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=local_now, onupdate=local_now)
    
    user: Mapped["User"] = relationship("User", backref="llm_providers")
    
    def to_dict(self, include_key: bool = False):
        result = {
            "id": self.id,
            "user_id": self.user_id,
            "name": self.name,
            "provider_type": self.provider_type,
            "base_url": self.base_url,
            "default_model": self.default_model,
            "max_tokens": self.max_tokens,
            "is_default": self.is_default,
            "enabled": self.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
        }
        if include_key:
            result["api_key"] = self.api_key
        return result


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=local_now)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=local_now, onupdate=local_now)
    
    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")
    permission_level: Mapped[int] = mapped_column(Integer, default=1)
    workspace_path: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=local_now)
    
    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,
            "permission_level": self.permission_level,
            "workspace_path": self.workspace_path,
            "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)
    provider_id: Mapped[Optional[int]] = mapped_column(Integer, ForeignKey("llm_providers.id"), nullable=True)
    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=local_now)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=local_now, onupdate=local_now)
    
    user: Mapped["User"] = relationship("User", back_populates="conversations")
    provider: Mapped[Optional["LLMProvider"]] = relationship("LLMProvider")
    messages: Mapped[List["Message"]] = relationship(
        "Message", back_populates="conversation", cascade="all, delete-orphan",
        primaryjoin="Conversation.id == foreign(Message.conversation_id)"
    )
    
    def to_dict(self):
        return {
            "id": self.id,
            "user_id": self.user_id,
            "provider_id": self.provider_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

    同时服务于普通会话和聊天室：
    - 普通会话：conversation_id 非空，room_id 为空
    - 聊天室：room_id 非空，conversation_id 为空，sender_name/sender_color/round_number 有值
    """
    __tablename__ = "messages"
    
    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    conversation_id: Mapped[Optional[str]] = mapped_column(String(64), ForeignKey("conversations.id"), nullable=True)
    room_id: Mapped[Optional[str]] = mapped_column(String(64), ForeignKey("chat_rooms.id"), nullable=True)
    role: Mapped[str] = mapped_column(String(16), nullable=False)
    content: Mapped[str] = mapped_column(Text, nullable=False, default="")
    token_count: Mapped[int] = mapped_column(Integer, default=0)
    usage: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    # 聊天室专属字段（普通会话为空）
    sender_name: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
    sender_color: Mapped[Optional[str]] = mapped_column(String(7), nullable=True, default="#2563eb")
    round_number: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=local_now)
    
    conversation: Mapped[Optional["Conversation"]] = relationship("Conversation", back_populates="messages")
    room: Mapped[Optional["ChatRoom"]] = relationship("ChatRoom", back_populates="messages")
    
    def to_dict(self):
        import json
        
        result = {
            "id": self.id,
            "conversation_id": self.conversation_id,
            "room_id": self.room_id,
            "role": self.role,
            "token_count": self.token_count,
            "created_at": self.created_at.isoformat() if self.created_at else None
        }
        
        if self.usage:
            try:
                result["usage"] = json.loads(self.usage)
            except json.JSONDecodeError:
                result["usage"] = None
        
        # 聊天室专属字段
        if self.sender_name:
            result["sender_name"] = self.sender_name
        if self.sender_color:
            result["sender_color"] = self.sender_color
        if self.round_number is not None:
            result["round_number"] = self.round_number
        
        try:
            content_obj = json.loads(self.content) if self.content else {}
        except json.JSONDecodeError:
            result["content"] = self.content
            result["text"] = self.content
            result["attachments"] = []
            result["process_steps"] = []
            return result

        steps = content_obj.get("steps", [])
        result["process_steps"] = steps

        text_content = "".join(
            s.get("content", "") for s in steps
            if s.get("type") == "text"
        )
        result["text"] = text_content
        result["content"] = text_content
        result["attachments"] = content_obj.get("attachments", [])

        return result


# ============ Chat Room Models ============

class ChatRoom(Base):
    """Multi-agent chat room model"""
    __tablename__ = "chat_rooms"
    
    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    user_id: Mapped[int] = mapped_column(Integer, ForeignKey("users.id"), nullable=False)
    title: Mapped[str] = mapped_column(String(255), nullable=False)
    task: Mapped[str] = mapped_column(Text, nullable=False, default="")
    status: Mapped[str] = mapped_column(String(20), nullable=False, default="idle")  # idle, running, paused, completed, error
    max_rounds: Mapped[int] = mapped_column(Integer, default=5)
    current_round: Mapped[int] = mapped_column(Integer, default=0)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=local_now)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=local_now, onupdate=local_now)
    
    user: Mapped["User"] = relationship("User", backref="chat_rooms")
    agents: Mapped[List["RoomAgent"]] = relationship(
        "RoomAgent", back_populates="room", cascade="all, delete-orphan", order_by="RoomAgent.turn_order"
    )
    messages: Mapped[List["Message"]] = relationship(
        "Message", back_populates="room", cascade="all, delete-orphan",
        primaryjoin="ChatRoom.id == foreign(Message.room_id)",
        order_by="Message.created_at"
    )
    
    def to_dict(self, include_messages: bool = False):
        result = {
            "id": self.id,
            "user_id": self.user_id,
            "title": self.title,
            "task": self.task,
            "status": self.status,
            "max_rounds": self.max_rounds,
            "current_round": self.current_round,
            "created_at": self.created_at.isoformat() if self.created_at else None,
            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
            "agents": [a.to_dict() for a in self.agents]
        }
        if include_messages:
            result["messages"] = [m.to_dict() for m in self.messages]
        return result


class RoomAgent(Base):
    """Agent configuration in a chat room"""
    __tablename__ = "room_agents"
    
    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    room_id: Mapped[str] = mapped_column(String(64), ForeignKey("chat_rooms.id"), nullable=False)
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    role: Mapped[str] = mapped_column(String(255), nullable=False, default="")
    provider_id: Mapped[Optional[int]] = mapped_column(Integer, ForeignKey("llm_providers.id"), nullable=True)
    model: Mapped[str] = mapped_column(String(100), nullable=False, default="")
    system_prompt: Mapped[str] = mapped_column(Text, nullable=False, default="You are a helpful AI assistant.")
    color: Mapped[str] = mapped_column(String(7), nullable=False, default="#2563eb")
    turn_order: Mapped[int] = mapped_column(Integer, default=0)
    
    room: Mapped["ChatRoom"] = relationship("ChatRoom", back_populates="agents")
    provider: Mapped[Optional["LLMProvider"]] = relationship("LLMProvider")
    
    def to_dict(self):
        return {
            "id": self.id,
            "room_id": self.room_id,
            "name": self.name,
            "role": self.role,
            "provider_id": self.provider_id,
            "model": self.model,
            "system_prompt": self.system_prompt,
            "color": self.color,
            "turn_order": self.turn_order
        }