src/streamlit_app.py

import streamlit as st
from openai import OpenAI
import time
import json # 导入json库
import os   # 导入os库用于读取环境变量

# =======================================================================
# 1. 导入您的类和数据
# =======================================================================

# 请将 'your_agent_file' 替换为包含 MsPatient 类的实际文件名
from ms_patient import MsPatient 

# 从本地JSON文件加载数据集的函数
def load_data_from_json(filepath="/app/src/CPsyCounS-3134.json"):
    """
    从本地的JSON文件加载数据集。
    请确保您已将数据集文件上传到与此应用相同的目录中。
    """
    try:
        with open(filepath, 'r', encoding='utf-8') as f:
            # 假设JSON文件的根是一个包含病人记录的列表
            return json.load(f)
    except FileNotFoundError:
        st.error(f"错误：找不到数据文件 '{filepath}'。请确保您已将该文件上传到Hugging Face Space。")
        return []
    except json.JSONDecodeError:
        st.error(f"错误：无法解析 '{filepath}'。请检查文件是否为有效的JSON格式。")
        return []
    except Exception as e:
        st.error(f"加载数据时发生未知错误: {e}")
        return []

# 加载数据
ALL_PATIENTS = load_data_from_json()


# =======================================================================
# 2. Streamlit 应用界面
# =======================================================================

# --- 页面配置 ---
st.set_page_config(
    page_title="与Anna对话",
    page_icon="�",
    layout="wide"
)

# --- 自定义CSS样式 ---
st.markdown("""
<style>
    /* 主聊天容器 */
    .st-emotion-cache-1y4p8pa { 
        padding-top: 2rem;
    }
    /* 聊天消息 */
    .st-chat-message {
        border-radius: 0.8rem;
        padding: 0.9rem 1.2rem;
        box-shadow: 0 2px 5px rgba(0,0,0,0.05);
        background-color: #ffffff;
    }
    .st-chat-message[data-testid="chat-message-container-user"] {
        background-color: #dcf8c6;
    }
    /* 侧边栏 */
    .st-sidebar {
        background-color: #f8f9fa;
        border-right: 1px solid #e9ecef;
    }
    .st-sidebar h2 {
        color: #343a40;
    }
    .st-expanderHeader {
        font-size: 1.1rem;
        font-weight: 600;
    }
</style>
""", unsafe_allow_html=True)


# --- 初始化 Session State 和 OpenAI Client ---
# 仅在会话状态中不存在时，才从环境变量初始化客户端
if "openai_client" not in st.session_state:
    api_key = os.getenv("OPENAI_API_KEY")
    if not api_key:
        st.session_state.openai_client = None
        st.session_state.model_name = None
    else:
        try:
            st.session_state.openai_client = OpenAI(api_key=api_key, base_url=os.getenv("OPENAI_BASE_URL"))
            st.session_state.model_name = os.getenv("OPENAI_MODEL_NAME", "gpt-4o-mini")
        except Exception as e:
            st.error(f"初始化OpenAI客户端失败: {e}")
            st.session_state.openai_client = None
            st.session_state.model_name = None

if "patient_agent" not in st.session_state:
    st.session_state.patient_agent = None
if "messages" not in st.session_state:
    st.session_state.messages = []
if "selected_patient_id" not in st.session_state:
    st.session_state.selected_patient_id = None


# --- 侧边栏 ---
with st.sidebar:
    st.title("👩 AnnaAgent 设置")
    st.markdown("---")

    # 病人选择
    if not ALL_PATIENTS:
        st.error("无法加载病人数据。请检查JSON文件是否已上传且格式正确。")
    else:
        patient_options = {p["id"]: f"{p['portrait']['gender']}，{p['portrait']['age']}岁 - {p['portrait']['symptoms']}" for p in ALL_PATIENTS}
        selected_id = st.selectbox(
            "选择一位病人进行对话",
            options=list(patient_options.keys()),
            format_func=lambda x: patient_options[x]
        )

        # 当选择的病人变化时，重置状态
        if st.session_state.selected_patient_id != selected_id:
            st.session_state.selected_patient_id = selected_id
            selected_patient_data = next((p for p in ALL_PATIENTS if p["id"] == selected_id), None)
            
            with st.spinner("正在生成病人角色..."):
                st.session_state.patient_agent = MsPatient(
                    portrait=selected_patient_data["portrait"],
                    report=selected_patient_data["report"],
                    previous_conversations=selected_patient_data["conversation"],
                    language="Chinese"
                )
            st.session_state.messages = [{"role": "assistant", "content": "你好，医生..."}]
            st.rerun()

    # 显示病人信息
    if st.session_state.patient_agent:
        st.markdown("---")
        st.subheader("病人信息")
        agent = st.session_state.patient_agent
        st.info(f"""
        **基本情况**: {agent.portrait['gender']}, {agent.portrait['age']}岁, {agent.portrait['occupation']}, {agent.portrait['marital_status']}
        
        **近期状态**: {agent.status}
        """)

        with st.expander("查看完整系统提示 (System Prompt)"):
            st.code(agent.get_system_prompt(), language='markdown')


# --- 主聊天界面 ---
st.title("💬 与 Anna 对话")
st.caption("这是一个模拟心理咨询的AI Agent。由 `MsPatient` 类驱动。")

# 检查API Key是否已在后台设置
if not st.session_state.openai_client:
    st.error("后台未设置 OPENAI_API_KEY。请在Hugging Face Space的'Settings' -> 'Secrets'中进行设置后刷新页面。")
else:
    # 显示聊天记录
    for message in st.session_state.messages:
        avatar = "👩" if message["role"] == "assistant" else "🧑‍⚕️"
        with st.chat_message(message["role"], avatar=avatar):
            st.markdown(message["content"])

    # 获取用户输入
    if prompt := st.chat_input("请输入您想说的话..."):
        st.session_state.messages.append({"role": "user", "content": prompt})
        with st.chat_message("user", avatar="🧑‍⚕️"):
            st.markdown(prompt)

        if st.session_state.patient_agent:
            with st.chat_message("assistant", avatar="👩"):
                with st.spinner("Anna正在思考..."):
                    response = st.session_state.patient_agent.chat(prompt)
                    st.markdown(response)
            
            st.session_state.messages.append({"role": "assistant", "content": response})
        else:
            st.warning("请先在左侧选择一位病人。")