"""
通讯录子图节点
Contact Subgraph Nodes
"""

from typing import Dict, Any
from datetime import datetime

from .state import ContactState, ContactAction, Contact, Email


def parse_intent(state: ContactState) -> ContactState:
    """
    解析用户意图节点
    确定用户想做什么操作
    """
    state.current_phase = "intent_parsing"
    
    query_lower = state.user_query.lower()
    
    # 简单的关键词匹配（真实场景应该用LLM）
    if any(keyword in query_lower for keyword in ["联系人", "contact", "list"]):
        state.action = ContactAction.CONTACT_LIST
        state.action_params = {"query": state.user_query}
    
    elif any(keyword in query_lower for keyword in ["添加", "add", "新建", "save"]):
        state.action = ContactAction.CONTACT_ADD
        # TODO: 提取联系人信息
    
    elif any(keyword in query_lower for keyword in ["邮件", "email", "inbox"]):
        state.action = ContactAction.EMAIL_LIST
    
    elif any(keyword in query_lower for keyword in ["发送邮件", "send email", "发邮件"]):
        state.action = ContactAction.EMAIL_SEND
    
    else:
        state.action = ContactAction.SNIFF_CONTACTS
    
    return state


def list_contacts(state: ContactState) -> ContactState:
    """
    列出联系人节点
    """
    state.current_phase = "listing_contacts"
    
    # TODO: 从数据库查询
    # 暂时返回空列表
    state.contacts = []
    state.success = True
    state.final_result = "暂无联系人"
    
    return state


def add_contact(state: ContactState) -> ContactState:
    """
    添加联系人节点
    """
    state.current_phase = "adding_contact"
    
    # TODO: 实现添加联系人逻辑
    state.success = True
    state.final_result = "联系人添加成功（待实现）"
    
    return state


def list_emails(state: ContactState) -> ContactState:
    """
    列出邮件节点
    """
    state.current_phase = "listing_emails"
    
    # TODO: 从IMAP查询
    state.emails = []
    state.success = True
    state.final_result = "暂无邮件"
    
    return state


def generate_email_draft(state: ContactState) -> ContactState:
    """
    生成邮件草稿节点
    """
    state.current_phase = "generating_draft"
    
    # TODO: 使用LLM生成邮件草稿
    state.draft_subject = "邮件主题"
    state.draft_recipient = "recipient@example.com"
    state.draft_body = "这是邮件内容..."
    
    # 进入人工审核状态
    state.pending_review = True
    state.review_type = "email_send"
    state.review_prompt = "请确认是否发送此邮件"
    
    return state


def human_review(state: ContactState) -> ContactState:
    """
    人工审核节点
    这里会让用户确认/修改
    """
    state.current_phase = "reviewing"
    
    # 注意：真实的LangGraph会在这里使用interrupt()暂停
    # 这里我们只设置状态，让外层处理
    if state.review_approved is True:
        state.pending_review = False
    elif state.review_approved is False:
        state.pending_review = False
        state.error_message = "发送已取消"
        state.success = False
    
    return state


def send_email(state: ContactState) -> ContactState:
    """
    发送邮件节点
    """
    state.current_phase = "sending_email"
    
    # TODO: 使用SMTP发送邮件
    state.success = True
    state.final_result = "邮件发送成功（待实现）"
    
    return state


def sniff_contacts(state: ContactState) -> ContactState:
    """
    智能嗅探节点
    从对话中提取可能的联系人信息
    """
    state.current_phase = "sniffing"
    
    # TODO: 实现智能嗅探
    state.success = True
    state.final_result = "智能嗅探完成（待实现）"
    
    return state


def format_result(state: ContactState) -> ContactState:
    """
    格式化结果节点
    """
    state.current_phase = "formatting"
    
    # 根据不同action生成不同的格式化输出
    if state.action == ContactAction.CONTACT_LIST:
        if state.contacts:
            result = "联系人列表：\n"
            for i, contact in enumerate(state.contacts, 1):
                result += f"{i}. {contact.name}"
                if contact.phone:
                    result += f" - {contact.phone}"
                if contact.email:
                    result += f" ({contact.email})"
                result += "\n"
        else:
            result = "暂无联系人"
        state.final_result = result
    
    elif state.action == ContactAction.EMAIL_LIST:
        if state.emails:
            result = "邮件列表：\n"
            for i, email in enumerate(state.emails[:10], 1):
                result += f"{i}. {email.subject} - {email.sender}\n"
        else:
            result = "暂无邮件"
        state.final_result = result
    
    else:
        if not state.final_result:
            state.final_result = "操作完成"
    
    state.current_phase = "done"
    return state


def should_continue(state: ContactState) -> str:
    """
    条件路由：决定下一步该做什么
    """
    if state.error_message:
        return "finalize"
    
    # 如果在审核中，等待
    if state.pending_review:
        return "human_review"
    
    # 根据action路由
    if state.action == ContactAction.NONE:
        return "parse_intent"
    elif state.action == ContactAction.CONTACT_LIST:
        return "list_contacts"
    elif state.action == ContactAction.CONTACT_ADD:
        return "add_contact"
    elif state.action == ContactAction.EMAIL_LIST:
        return "list_emails"
    elif state.action == ContactAction.EMAIL_SEND:
        if state.pending_review:
            return "human_review"
        elif state.draft_subject:
            return "send_email"
        else:
            return "generate_email_draft"
    elif state.action == ContactAction.SNIFF_CONTACTS:
        return "sniff_contacts"
    else:
        return "format_result"