"""ChatRoom models - unified participant architecture"""
from datetime import datetime
from typing import Optional, List
from sqlalchemy import String, Integer, Boolean, Text, DateTime, ForeignKey
from sqlalchemy.orm import Mapped, mapped_column, relationship

from luxx.core.database import Base


def local_now():
    return datetime.now()


class ChatRoom(Base):
    """Chat Room - group chat for multiple participants"""
    __tablename__ = "chat_rooms"

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    owner_id: Mapped[int] = mapped_column(Integer, ForeignKey("users.id"), nullable=False)
    is_active: 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)

    owner: Mapped["User"] = relationship("User", backref="chat_rooms")
    participants: Mapped[List["RoomParticipant"]] = relationship(
        "RoomParticipant", back_populates="room", cascade="all, delete-orphan"
    )
    # Note: messages are now stored in unified Message table with target_type="room"

    def to_dict(self, include_agents: bool = False):
        result = {
            "id": self.id, "name": self.name, "description": self.description,
            "owner_id": self.owner_id, "is_active": self.is_active,
            "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_agents and self.participants:
            result["participants"] = [p.to_dict() for p in self.participants]
        return result


class Agent(Base):
    """Agent model - defines an AI agent"""
    __tablename__ = "agents"

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    name: Mapped[str] = mapped_column(String(50), nullable=False)
    role: Mapped[str] = mapped_column(String(50), nullable=False, default="helper")
    avatar: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
    system_prompt: Mapped[str] = mapped_column(Text, nullable=False, default="You are helpful.")
    provider_id: Mapped[Optional[int]] = mapped_column(Integer, ForeignKey("llm_providers.id"), nullable=True)
    model: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
    tools: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    priority: Mapped[int] = mapped_column(Integer, default=5)
    auto_response: Mapped[bool] = mapped_column(Boolean, default=True)
    mention_trigger: Mapped[bool] = mapped_column(Boolean, default=False)
    temperature: Mapped[float] = mapped_column(Text, default="0.7")
    max_tokens: Mapped[int] = mapped_column(Integer, default=2048)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=local_now)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=local_now, onupdate=local_now)

    provider: Mapped[Optional["LLMProvider"]] = relationship("LLMProvider")
    room_participations: Mapped[List["RoomParticipant"]] = relationship(
        "RoomParticipant", back_populates="agent", cascade="all, delete-orphan"
    )

    def to_dict(self, include_secrets: bool = False):
        import json
        result = {
            "id": self.id, "name": self.name, "role": self.role, "avatar": self.avatar,
            "system_prompt": self.system_prompt, "provider_id": self.provider_id, "model": self.model,
            "is_active": self.is_active, "priority": self.priority,
            "auto_response": self.auto_response, "mention_trigger": self.mention_trigger,
            "temperature": float(self.temperature) if self.temperature else 0.7,
            "max_tokens": self.max_tokens,
            "created_at": self.created_at.isoformat() if self.created_at else None,
            "updated_at": self.updated_at.isoformat() if self.updated_at else None
        }
        try:
            result["tools"] = json.loads(self.tools) if self.tools else []
        except json.JSONDecodeError:
            result["tools"] = []
        if include_secrets and self.provider:
            result["provider"] = self.provider.to_dict(include_key=True)
        return result


class RoomParticipant(Base):
    """Room participant - unified for users and agents"""
    __tablename__ = "room_participants"

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    room_id: Mapped[str] = mapped_column(String(64), ForeignKey("chat_rooms.id"), nullable=False)
    agent_id: Mapped[Optional[str]] = mapped_column(String(64), ForeignKey("agents.id"), nullable=True)
    user_id: Mapped[Optional[int]] = mapped_column(Integer, ForeignKey("users.id"), nullable=True)
    role: Mapped[str] = mapped_column(String(32), default="member")
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    joined_at: Mapped[datetime] = mapped_column(DateTime, default=local_now)

    room: Mapped["ChatRoom"] = relationship("ChatRoom", back_populates="participants")
    agent: Mapped[Optional["Agent"]] = relationship("Agent", back_populates="room_participations")

    @property
    def participant_id(self) -> str:
        if self.agent_id:
            return f"agent:{self.agent_id}"
        return f"user:{self.user_id}" if self.user_id else ""

    @property
    def participant_type(self) -> str:
        return "agent" if self.agent_id else "user"

    @property
    def name(self) -> str:
        return self.agent.name if self.agent else f"user_{self.user_id}"

    def to_dict(self):
        return {
            "id": self.id, "room_id": self.room_id, "agent_id": self.agent_id, "user_id": self.user_id,
            "participant_id": self.participant_id, "participant_type": self.participant_type,
            "name": self.name, "role": self.role, "is_active": self.is_active,
            "joined_at": self.joined_at.isoformat() if self.joined_at else None
        }