import datetime
import uuid
from sqlalchemy import Column, String, Boolean, DateTime, Text, ForeignKey
from sqlalchemy.dialects.postgresql import UUID, JSON
from sqlalchemy.orm import relationship
from app.db import Base


class AgentConfig(Base):
    __tablename__ = "agent_configs"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4, index=True)

    # 一对一关联到 App
    app_id = Column(UUID(as_uuid=True), ForeignKey("apps.id"), nullable=False, unique=True, index=True)

    # Agent 行为配置
    system_prompt = Column(Text, nullable=True, comment="系统提示词")
    default_model_config_id = Column(UUID(as_uuid=True), ForeignKey("model_configs.id"), nullable=True, index=True, comment="默认模型配置ID")
    
    # 结构化配置（直接存储 JSON）
    model_parameters = Column(JSON, nullable=True, comment="模型参数配置（temperature、max_tokens等）")
    knowledge_retrieval = Column(JSON, nullable=True, comment="知识库检索配置")
    memory = Column(JSON, nullable=True, comment="记忆配置")
    variables = Column(JSON, default=list, nullable=True, comment="变量配置")
    tools = Column(JSON, default=dict, nullable=True, comment="工具配置")
    
    # 多 Agent 相关字段
    agent_role = Column(String(20), comment="Agent 角色: master|sub|standalone")
    agent_domain = Column(String(50), comment="专业领域: customer_service|technical_support|sales 等")
    parent_agent_id = Column(UUID(as_uuid=True), ForeignKey("agent_configs.id"), comment="父 Agent ID")
    capabilities = Column(JSON, default=list, comment="Agent 能力列表")

    # 状态与时间戳
    is_active = Column(Boolean, default=True, nullable=False)
    created_at = Column(DateTime, default=datetime.datetime.now)
    updated_at = Column(DateTime, default=datetime.datetime.now, onupdate=datetime.datetime.now)

    # 关系
    app = relationship("App", back_populates="agent_config")
    parent_agent = relationship("AgentConfig", remote_side=[id], backref="sub_agents")

    def __repr__(self):
        return f"<AgentConfig(id={self.id}, app_id={self.app_id})>"