前端修改

frontend/components/sidebar.py

@@ -0,0 +1,169 @@
+"""
+左侧栏组件
+包含用户登录和历史对话列表
+"""
+
+import streamlit as st
+from datetime import datetime
+
+# 使用绝对导入
+from frontend.state import AppState
+from frontend.api_client import api_client
+from frontend.config import config
+
+
+def render_sidebar():
+    """渲染左侧栏"""
+    _render_user_section()
+    st.divider()
+    _render_history_section()
+
+
+def _render_user_section():
+    """渲染用户登录区域"""
+    st.header("👤 用户")
+    
+    if not AppState.is_logged_in():
+        _render_login_form()
+    else:
+        _render_user_info()
+
+
+def _render_login_form():
+    """渲染登录表单"""
+    username = st.text_input(
+        "输入用户名（可选）",
+        key="login_input",
+        placeholder="留空使用默认用户",
+        help="未登录将使用 default_user，可能导致对话污染"
+    )
+    
+    if st.button("✅ 进入", type="primary", use_container_width=True):
+        AppState.login(username)
+        _refresh_threads()
+        st.rerun()
+    
+    st.info("💡 建议登录以隔离对话历史")
+
+
+def _render_user_info():
+    """渲染用户信息"""
+    st.success(f"✅ 当前用户: `{AppState.get_user_id()}`")
+    
+    if st.button("🔄 切换用户", use_container_width=True):
+        AppState.logout()
+        st.rerun()
+
+
+def _render_history_section():
+    """渲染历史对话列表"""
+    st.header("📚 对话历史")
+    
+    # 操作按钮
+    _render_history_actions()
+    
+    st.divider()
+    
+    # 历史列表
+    _render_thread_list()
+
+
+def _render_history_actions():
+    """渲染历史操作按钮"""
+    if st.button("🔄 刷新列表", use_container_width=True):
+        _refresh_threads()
+    
+    if st.button("➕ 新对话", type="primary", use_container_width=True):
+        AppState.start_new_thread()
+        st.rerun()
+
+
+def _render_thread_list():
+    """渲染线程列表"""
+    threads = AppState.get_threads()
+    
+    if not threads:
+        st.info("暂无对话历史")
+        return
+    
+    for thread in threads:
+        _render_thread_item(thread)
+
+
+def _render_thread_item(thread: dict):
+    """
+    渲染单个线程项
+    
+    Args:
+        thread: 线程信息字典
+    """
+    thread_id = thread["thread_id"]
+    summary = thread.get("summary", "空对话")
+    message_count = thread.get("message_count", 0)
+    last_updated = thread.get("last_updated", "")
+    
+    # 格式化时间
+    time_str = _format_time(last_updated)
+    
+    # 判断是否为当前线程
+    is_current = thread_id == AppState.get_current_thread_id()
+    button_type = "primary" if is_current else "secondary"
+    
+    # 截断摘要
+    summary_display = summary[:config.summary_max_length]
+    if len(summary) > config.summary_max_length:
+        summary_display += "..."
+    
+    # 渲染按钮
+    if st.button(
+        f"💬 {summary_display}\n\n🕐 {time_str} | {message_count}条",
+        key=f"thread_{thread_id}",
+        use_container_width=True,
+        type=button_type
+    ):
+        _load_thread(thread_id)
+
+
+def _format_time(time_str: str) -> str:
+    """
+    格式化时间字符串
+    
+    Args:
+        time_str: ISO 格式时间字符串
+        
+    Returns:
+        格式化后的时间字符串
+    """
+    if not time_str:
+        return "未知"
+    
+    try:
+        dt = datetime.fromisoformat(time_str.replace("Z", "+00:00"))
+        return dt.strftime("%m-%d %H:%M")
+    except Exception:
+        return time_str[:10]
+
+
+def _refresh_threads():
+    """刷新历史线程列表"""
+    threads = api_client.get_user_threads(AppState.get_user_id())
+    AppState.set_threads(threads)
+
+
+def _load_thread(thread_id: str):
+    """
+    加载指定线程的消息历史
+    
+    Args:
+        thread_id: 线程 ID
+    """
+    messages = api_client.get_thread_messages(thread_id, AppState.get_user_id())
+    
+    if messages:
+        AppState.set_current_thread_id(thread_id)
+        AppState.clear_messages()
+        for msg in messages:
+            AppState.add_message(msg["role"], msg["content"])
+        st.rerun()
+    else:
+        st.error("加载对话失败")