"""
主图状态定义 - React 模式增强版
Main Graph State Definition - React Mode Enhanced

字段分类说明：
- 持久化字段：跨轮次保留，不重置
- 临时字段：每轮对话开始时重置
"""

from enum import Enum, auto
from typing import Optional, Dict, Any, Annotated, Sequence, TypedDict, List
from dataclasses import dataclass, field
from langgraph.graph import add_messages
from langchain_core.messages import BaseMessage


# ========== 枚举类型 ==========
class CurrentAction(Enum):
    """主图当前操作类型"""
    NONE = auto()
    GENERAL_CHAT = auto()
    NEWS_ANALYSIS = auto()
    DICTIONARY = auto()
    CONTACT = auto()


class ErrorSeverity(Enum):
    """错误严重程度"""
    INFO = auto()     # 信息级别，继续执行
    WARNING = auto()  # 警告级别，可以重试
    ERROR = auto()    # 错误级别，需要处理
    FATAL = auto()    # 致命错误，终止执行


@dataclass
class ErrorRecord:
    """错误记录"""
    error_type: str
    error_message: str
    severity: ErrorSeverity = ErrorSeverity.ERROR
    source: str = ""  # 来源：哪个节点/子图/工具
    timestamp: str = ""
    retry_count: int = 0  # 已重试次数
    max_retries: int = 3  # 最大重试次数
    context: Dict[str, Any] = field(default_factory=dict)  # 错误上下文


@dataclass
class ReactReasoningState:
    """React 推理状态"""
    last_reasoning: Optional[Dict[str, Any]] = None
    reasoning_result: Optional[Any] = None  # 实际类型是 ReasoningResult


@dataclass
class HybridRouterState:
    """混合路由状态"""
    decision: Optional[Any] = None  # 实际类型是 HybridRouterResult
    start_time: Optional[str] = None


@dataclass
class FastPathState:
    """快速路径状态"""
    chitchat_success: bool = False
    rag_success: bool = False
    tool_success: bool = False
    failed: bool = False
    fail_reason: str = ""


@dataclass
class MainGraphState:
    """
    主图状态定义
    
    字段分类：
    - 持久化字段：跨轮次保留，不重置
    - 临时字段：每轮对话开始时重置
    """
    
    # ==================================================
    # 持久化字段（每轮保留）
    # ==================================================
    
    messages: Annotated[Sequence[BaseMessage], add_messages] = field(default_factory=list)
    turns_since_last_summary: int = 0  # 距离上次总结的轮数
    user_id: str = ""
    
    # ==================================================
    # 临时字段（每轮重置）
    # ==================================================
    
    # 主图控制字段
    user_query: str = ""
    current_action: CurrentAction = CurrentAction.NONE
    current_model: str = ""  # 本次请求使用的模型
    intent_confidence: float = 0.0
    
    # React 推理专用字段
    reasoning_step: int = 0
    max_steps: int = 10  # 避免过长循环
    last_action: str = ""
    reasoning_history: List[Dict[str, Any]] = field(default_factory=list)
    
    # RAG 相关字段
    rag_context: str = ""
    rag_retrieved: bool = False
    rag_docs: List[Dict[str, Any]] = field(default_factory=list)
    rag_confidence: float = 0.0  # RAG 检索置信度 (0.0-1.0)
    rag_attempts: int = 0  # RAG 检索次数统计
    
    # 联网搜索相关字段
    web_search_results: List[str] = field(default_factory=list)
    
    # 错误处理字段
    errors: List[ErrorRecord] = field(default_factory=list)
    current_error: Optional[ErrorRecord] = None
    retry_action: Optional[str] = None
    error_message: str = ""
    
    # 子图结果字段
    news_result: Optional[Dict[str, Any]] = None
    dictionary_result: Optional[Dict[str, Any]] = None
    contact_result: Optional[Dict[str, Any]] = None
    
    # 执行状态
    current_phase: str = "init"
    final_result: str = ""
    success: bool = False
    
    # 元数据
    start_time: Optional[str] = None
    end_time: Optional[str] = None
    
    # 结构化状态
    react_reasoning: ReactReasoningState = field(default_factory=ReactReasoningState)
    hybrid_router: HybridRouterState = field(default_factory=HybridRouterState)
    fast_path: FastPathState = field(default_factory=FastPathState)
    
    # 统计字段（用于反馈）
    llm_calls: int = 0
    last_token_usage: Dict[str, Any] = field(default_factory=dict)
    last_elapsed_time: float = 0.0
    memory_context: str = ""  # 记忆检索结果
    
    # 向后兼容（保留但不推荐使用）
    debug_info: Dict[str, Any] = field(default_factory=dict)