main.py

import json, time, os, asyncio, uuid, ssl, re, yaml, shutil
from datetime import datetime, timezone, timedelta
from typing import List, Optional, Union, Dict, Any
from pathlib import Path
import logging
from dotenv import load_dotenv

import httpx
import aiofiles
from fastapi import FastAPI, HTTPException, Header, Request, Body, Form
from fastapi.responses import StreamingResponse, HTMLResponse, JSONResponse, RedirectResponse
from fastapi.staticfiles import StaticFiles
from pydantic import BaseModel
from util.streaming_parser import parse_json_array_stream_async
from collections import deque
from threading import Lock

# ---------- 数据目录配置 ----------
# 自动检测环境：HF Spaces Pro 使用 /data，本地使用 ./data
if os.path.exists("/data"):
    DATA_DIR = "/data"  # HF Pro 持久化存储
    logger_prefix = "[HF-PRO]"
else:
    DATA_DIR = "./data"  # 本地持久化存储
    logger_prefix = "[LOCAL]"

# 确保数据目录存在
os.makedirs(DATA_DIR, exist_ok=True)

# 统一的数据文件路径
ACCOUNTS_FILE = os.path.join(DATA_DIR, "accounts.json")
SETTINGS_FILE = os.path.join(DATA_DIR, "settings.yaml")
STATS_FILE = os.path.join(DATA_DIR, "stats.json")
IMAGE_DIR = os.path.join(DATA_DIR, "images")

# 确保图片目录存在
os.makedirs(IMAGE_DIR, exist_ok=True)

# 导入认证模块
from core.auth import verify_api_key
from core.session_auth import is_logged_in, login_user, logout_user, require_login, generate_session_secret

# 导入核心模块
from core.message import (
    get_conversation_key,
    parse_last_message,
    build_full_context_text
)
from core.google_api import (
    get_common_headers,
    create_google_session,
    upload_context_file,
    get_session_file_metadata,
    download_image_with_jwt,
    save_image_to_hf
)
from core.account import (
    AccountManager,
    MultiAccountManager,
    format_account_expiration,
    load_multi_account_config,
    load_accounts_from_source,
    update_accounts_config as _update_accounts_config,
    delete_account as _delete_account,
    update_account_disabled_status as _update_account_disabled_status
)

# 导入 Uptime 追踪器
from core import uptime as uptime_tracker

# 导入配置管理和模板系统
from fastapi.templating import Jinja2Templates
from core.config import config_manager, config
from util.template_helpers import prepare_admin_template_data

# ---------- 日志配置 ----------

# 内存日志缓冲区 (保留最近 3000 条日志，重启后清空)
log_buffer = deque(maxlen=3000)
log_lock = Lock()

# 统计数据持久化
stats_lock = asyncio.Lock()  # 改为异步锁

async def load_stats():
    """加载统计数据（异步）"""
    try:
        if os.path.exists(STATS_FILE):
            async with aiofiles.open(STATS_FILE, 'r', encoding='utf-8') as f:
                content = await f.read()
                return json.loads(content)
    except Exception:
        pass
    return {
        "total_visitors": 0,
        "total_requests": 0,
        "request_timestamps": [],  # 最近1小时的请求时间戳
        "visitor_ips": {},  # {ip: timestamp} 记录访问IP和时间
        "account_conversations": {}  # {account_id: conversation_count} 账户对话次数
    }

async def save_stats(stats):
    """保存统计数据（异步，避免阻塞事件循环）"""
    try:
        async with aiofiles.open(STATS_FILE, 'w', encoding='utf-8') as f:
            await f.write(json.dumps(stats, ensure_ascii=False, indent=2))
    except Exception as e:
        logger.error(f"[STATS] 保存统计数据失败: {str(e)[:50]}")

# 初始化统计数据（需要在启动时异步加载）
global_stats = {
    "total_visitors": 0,
    "total_requests": 0,
    "request_timestamps": [],
    "visitor_ips": {},
    "account_conversations": {}
}

class MemoryLogHandler(logging.Handler):
    """自定义日志处理器，将日志写入内存缓冲区"""
    def emit(self, record):
        log_entry = self.format(record)
        # 转换为北京时间（UTC+8）
        beijing_tz = timezone(timedelta(hours=8))
        beijing_time = datetime.fromtimestamp(record.created, tz=beijing_tz)
        with log_lock:
            log_buffer.append({
                "time": beijing_time.strftime("%Y-%m-%d %H:%M:%S"),
                "level": record.levelname,
                "message": record.getMessage()
            })

# 配置日志
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s | %(levelname)s | %(message)s",
    datefmt="%H:%M:%S",
)
logger = logging.getLogger("gemini")

# 添加内存日志处理器
memory_handler = MemoryLogHandler()
memory_handler.setFormatter(logging.Formatter("%(asctime)s | %(levelname)s | %(message)s", datefmt="%H:%M:%S"))
logger.addHandler(memory_handler)

# ---------- 配置管理（使用统一配置系统）----------
# 所有配置通过 config_manager 访问，优先级：环境变量 > YAML > 默认值
TIMEOUT_SECONDS = 600
API_KEY = config.basic.api_key
PATH_PREFIX = config.security.path_prefix
ADMIN_KEY = config.security.admin_key
PROXY = config.basic.proxy
BASE_URL = config.basic.base_url
SESSION_SECRET_KEY = config.security.session_secret_key
SESSION_EXPIRE_HOURS = config.session.expire_hours

# ---------- 公开展示配置 ----------
LOGO_URL = config.public_display.logo_url
CHAT_URL = config.public_display.chat_url

# ---------- 图片生成配置 ----------
IMAGE_GENERATION_ENABLED = config.image_generation.enabled
IMAGE_GENERATION_MODELS = config.image_generation.supported_models

# ---------- 重试配置 ----------
MAX_NEW_SESSION_TRIES = config.retry.max_new_session_tries
MAX_REQUEST_RETRIES = config.retry.max_request_retries
MAX_ACCOUNT_SWITCH_TRIES = config.retry.max_account_switch_tries
ACCOUNT_FAILURE_THRESHOLD = config.retry.account_failure_threshold
RATE_LIMIT_COOLDOWN_SECONDS = config.retry.rate_limit_cooldown_seconds
SESSION_CACHE_TTL_SECONDS = config.retry.session_cache_ttl_seconds

# ---------- 模型映射配置 ----------
MODEL_MAPPING = {
    "gemini-auto": None,
    "gemini-2.5-flash": "gemini-2.5-flash",
    "gemini-2.5-pro": "gemini-2.5-pro",
    "gemini-3-flash-preview": "gemini-3-flash-preview",
    "gemini-3-pro-preview": "gemini-3-pro-preview"
}

# ---------- HTTP 客户端 ----------
http_client = httpx.AsyncClient(
    proxy=PROXY or None,
    verify=False,
    http2=False,
    timeout=httpx.Timeout(TIMEOUT_SECONDS, connect=60.0),
    limits=httpx.Limits(
        max_keepalive_connections=100,  # 增加5倍：20 -> 100
        max_connections=200              # 增加4倍：50 -> 200
    )
)

# ---------- 工具函数 ----------
def get_base_url(request: Request) -> str:
    """获取完整的base URL（优先环境变量，否则从请求自动获取）"""
    # 优先使用环境变量
    if BASE_URL:
        return BASE_URL.rstrip("/")

    # 自动从请求获取（兼容反向代理）
    forwarded_proto = request.headers.get("x-forwarded-proto", request.url.scheme)
    forwarded_host = request.headers.get("x-forwarded-host", request.headers.get("host"))

    return f"{forwarded_proto}://{forwarded_host}"

# ---------- 常量定义 ----------
USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36"

# ---------- 多账户支持 ----------
# (AccountConfig, AccountManager, MultiAccountManager 已移至 core/account.py)

# ---------- 配置文件管理 ----------
# (配置管理函数已移至 core/account.py)

# 初始化多账户管理器
multi_account_mgr = load_multi_account_config(
    http_client,
    USER_AGENT,
    ACCOUNT_FAILURE_THRESHOLD,
    RATE_LIMIT_COOLDOWN_SECONDS,
    SESSION_CACHE_TTL_SECONDS,
    global_stats
)

# 验证必需的环境变量
if not ADMIN_KEY:
    logger.error("[SYSTEM] 未配置 ADMIN_KEY 环境变量，请设置后重启")
    import sys
    sys.exit(1)

# 启动日志
if PATH_PREFIX:
    logger.info(f"[SYSTEM] 路径前缀已配置: {PATH_PREFIX[:4]}****")
    logger.info(f"[SYSTEM] API端点: /{PATH_PREFIX}/v1/chat/completions")
    logger.info(f"[SYSTEM] 管理端点: /{PATH_PREFIX}/")
else:
    logger.info("[SYSTEM] 未配置路径前缀，使用默认路径")
    logger.info("[SYSTEM] API端点: /v1/chat/completions")
    logger.info("[SYSTEM] 管理端点: /admin/")
logger.info("[SYSTEM] 公开端点: /public/log/html, /public/stats, /public/uptime/html")
logger.info(f"[SYSTEM] Session过期时间: {SESSION_EXPIRE_HOURS}小时")
logger.info("[SYSTEM] 系统初始化完成")

# ---------- JWT 管理 ----------
# (JWTManager已移至 core/jwt.py)

# ---------- Session & File 管理 ----------
# (Google API函数已移至 core/google_api.py)

# ---------- 消息处理逻辑 ----------
# (消息处理函数已移至 core/message.py)

# ---------- OpenAI 兼容接口 ----------
app = FastAPI(title="Gemini-Business OpenAI Gateway")

# ---------- 模板系统配置 ----------
templates = Jinja2Templates(directory="templates")

# 开发模式：支持热更新
if os.getenv("ENV") == "development":
    templates.env.auto_reload = True
    logger.info("[SYSTEM] 模板热更新已启用（开发模式）")

# 挂载静态文件
app.mount("/static", StaticFiles(directory="static"), name="static")

# ---------- Session 中间件配置 ----------
from starlette.middleware.sessions import SessionMiddleware
app.add_middleware(
    SessionMiddleware,
    secret_key=SESSION_SECRET_KEY,
    max_age=SESSION_EXPIRE_HOURS * 3600,  # 转换为秒
    same_site="lax",
    https_only=False  # 本地开发可设为False，生产环境建议True
)

# ---------- Uptime 追踪中间件 ----------
@app.middleware("http")
async def track_uptime_middleware(request: Request, call_next):
    """追踪每个请求的成功/失败状态，用于 Uptime 监控"""
    # 只追踪 API 请求（排除静态文件、管理端点等）
    path = request.url.path
    if path.startswith("/images/") or path.startswith("/public/") or path.startswith("/favicon"):
        return await call_next(request)

    start_time = time.time()
    success = False
    model = None

    try:
        response = await call_next(request)
        success = response.status_code < 400

        # 尝试从请求中提取模型信息
        if hasattr(request.state, "model"):
            model = request.state.model

        # 记录 API 主服务状态
        uptime_tracker.record_request("api_service", success)

        # 如果有模型信息，记录模型状态
        if model and model in uptime_tracker.SUPPORTED_MODELS:
            uptime_tracker.record_request(model, success)

        return response

    except Exception as e:
        # 请求失败 - 尝试提取模型信息（可能在异常前已设置）
        if hasattr(request.state, "model"):
            model = request.state.model

        uptime_tracker.record_request("api_service", False)
        if model and model in uptime_tracker.SUPPORTED_MODELS:
            uptime_tracker.record_request(model, False)
        raise

# ---------- 图片静态服务初始化 ----------
os.makedirs(IMAGE_DIR, exist_ok=True)
app.mount("/images", StaticFiles(directory=IMAGE_DIR), name="images")
if IMAGE_DIR == "/data/images":
    logger.info(f"[SYSTEM] 图片静态服务已启用: /images/ -> {IMAGE_DIR} (HF Pro持久化)")
else:
    logger.info(f"[SYSTEM] 图片静态服务已启用: /images/ -> {IMAGE_DIR} (本地持久化)")

# ---------- 后台任务启动 ----------
@app.on_event("startup")
async def startup_event():
    """应用启动时初始化后台任务"""
    global global_stats

    # 文件迁移逻辑：将根目录的旧文件迁移到 data 目录
    old_accounts = "accounts.json"
    if os.path.exists(old_accounts) and not os.path.exists(ACCOUNTS_FILE):
        try:
            shutil.copy(old_accounts, ACCOUNTS_FILE)
            logger.info(f"{logger_prefix} 已迁移 {old_accounts} -> {ACCOUNTS_FILE}")
        except Exception as e:
            logger.warning(f"{logger_prefix} 文件迁移失败: {e}")

    # 加载统计数据
    global_stats = await load_stats()
    logger.info(f"[SYSTEM] 统计数据已加载: {global_stats['total_requests']} 次请求, {global_stats['total_visitors']} 位访客")

    # 启动缓存清理任务
    asyncio.create_task(multi_account_mgr.start_background_cleanup())
    logger.info("[SYSTEM] 后台缓存清理任务已启动（间隔: 5分钟）")

    # 启动 Uptime 数据聚合任务
    asyncio.create_task(uptime_tracker.uptime_aggregation_task())
    logger.info("[SYSTEM] Uptime 数据聚合任务已启动（间隔: 240秒）")

# ---------- 日志脱敏函数 ----------
def get_sanitized_logs(limit: int = 100) -> list:
    """获取脱敏后的日志列表，按请求ID分组并提取关键事件"""
    with log_lock:
        logs = list(log_buffer)

    # 按请求ID分组（支持两种格式：带[req_xxx]和不带的）
    request_logs = {}
    orphan_logs = []  # 没有request_id的日志（如选择账户）

    for log in logs:
        message = log["message"]
        req_match = re.search(r'\[req_([a-z0-9]+)\]', message)

        if req_match:
            request_id = req_match.group(1)
            if request_id not in request_logs:
                request_logs[request_id] = []
            request_logs[request_id].append(log)
        else:
            # 没有request_id的日志（如选择账户），暂存
            orphan_logs.append(log)

    # 将orphan_logs（如选择账户）关联到对应的请求
    # 策略：将orphan日志关联到时间上最接近的后续请求
    for orphan in orphan_logs:
        orphan_time = orphan["time"]
        # 找到时间上最接近且在orphan之后的请求
        closest_request_id = None
        min_time_diff = None

        for request_id, req_logs in request_logs.items():
            if req_logs:
                first_log_time = req_logs[0]["time"]
                # orphan应该在请求之前或同时
                if first_log_time >= orphan_time:
                    if min_time_diff is None or first_log_time < min_time_diff:
                        min_time_diff = first_log_time
                        closest_request_id = request_id

        # 如果找到最接近的请求，将orphan日志插入到该请求的日志列表开头
        if closest_request_id:
            request_logs[closest_request_id].insert(0, orphan)

    # 为每个请求提取关键事件
    sanitized = []
    for request_id, req_logs in request_logs.items():
        # 收集关键信息
        model = None
        message_count = None
        retry_events = []
        final_status = "in_progress"
        duration = None
        start_time = req_logs[0]["time"]

        # 遍历该请求的所有日志
        for log in req_logs:
            message = log["message"]

            # 提取模型名称和消息数量（开始对话）
            if '收到请求:' in message and not model:
                model_match = re.search(r'收到请求: ([^ |]+)', message)
                if model_match:
                    model = model_match.group(1)
                count_match = re.search(r'(\d+)条消息', message)
                if count_match:
                    message_count = int(count_match.group(1))

            # 提取重试事件（包括失败尝试、账户切换、选择账户）
            # 注意：不提取"正在重试"日志，因为它和"失败 (尝试"是配套的
            if any(keyword in message for keyword in ['切换账户', '选择账户', '失败 (尝试']):
                retry_events.append({
                    "time": log["time"],
                    "message": message
                })

            # 提取响应完成（最高优先级 - 最终成功则忽略中间错误）
            if '响应完成:' in message:
                time_match = re.search(r'响应完成: ([\d.]+)秒', message)
                if time_match:
                    duration = time_match.group(1) + 's'
                    final_status = "success"

            # 检测非流式响应完成
            if '非流式响应完成' in message:
                final_status = "success"

            # 检测失败状态（仅在非success状态下）
            if final_status != "success" and (log['level'] == 'ERROR' or '失败' in message):
                final_status = "error"

            # 检测超时（仅在非success状态下）
            if final_status != "success" and '超时' in message:
                final_status = "timeout"

        # 如果没有模型信息但有错误，仍然显示
        if not model and final_status == "in_progress":
            continue

        # 构建关键事件列表
        events = []

        # 1. 开始对话
        if model:
            events.append({
                "time": start_time,
                "type": "start",
                "content": f"{model} | {message_count}条消息" if message_count else model
            })
        else:
            # 没有模型信息但有错误的情况
            events.append({
                "time": start_time,
                "type": "start",
                "content": "请求处理中"
            })

        # 2. 重试事件
        failure_count = 0  # 失败重试计数
        account_select_count = 0  # 账户选择计数

        for i, retry in enumerate(retry_events):
            msg = retry["message"]

            # 识别不同类型的重试事件（按优先级匹配）
            if '失败 (尝试' in msg:
                # 创建会话失败
                failure_count += 1
                events.append({
                    "time": retry["time"],
                    "type": "retry",
                    "content": f"服务异常，正在重试（{failure_count}）"
                })
            elif '选择账户' in msg:
                # 账户选择/切换
                account_select_count += 1

                # 检查下一条日志是否是"切换账户"，如果是则跳过当前"选择账户"（避免重复）
                next_is_switch = (i + 1 < len(retry_events) and '切换账户' in retry_events[i + 1]["message"])

                if not next_is_switch:
                    if account_select_count == 1:
                        # 第一次选择：显示为"选择服务节点"
                        events.append({
                            "time": retry["time"],
                            "type": "select",
                            "content": "选择服务节点"
                        })
                    else:
                        # 第二次及以后：显示为"切换服务节点"
                        events.append({
                            "time": retry["time"],
                            "type": "switch",
                            "content": "切换服务节点"
                        })
            elif '切换账户' in msg:
                # 运行时切换账户（显示为"切换服务节点"）
                events.append({
                    "time": retry["time"],
                    "type": "switch",
                    "content": "切换服务节点"
                })

        # 3. 完成事件
        if final_status == "success":
            if duration:
                events.append({
                    "time": req_logs[-1]["time"],
                    "type": "complete",
                    "status": "success",
                    "content": f"响应完成 | 耗时{duration}"
                })
            else:
                events.append({
                    "time": req_logs[-1]["time"],
                    "type": "complete",
                    "status": "success",
                    "content": "响应完成"
                })
        elif final_status == "error":
            events.append({
                "time": req_logs[-1]["time"],
                "type": "complete",
                "status": "error",
                "content": "请求失败"
            })
        elif final_status == "timeout":
            events.append({
                "time": req_logs[-1]["time"],
                "type": "complete",
                "status": "timeout",
                "content": "请求超时"
            })

        sanitized.append({
            "request_id": request_id,
            "start_time": start_time,
            "status": final_status,
            "events": events
        })

    # 按时间排序并限制数量
    sanitized.sort(key=lambda x: x["start_time"], reverse=True)
    return sanitized[:limit]

class Message(BaseModel):
    role: str
    content: Union[str, List[Dict[str, Any]]]

class ChatRequest(BaseModel):
    model: str = "gemini-auto"
    messages: List[Message]
    stream: bool = False
    temperature: Optional[float] = 0.7
    top_p: Optional[float] = 1.0

def create_chunk(id: str, created: int, model: str, delta: dict, finish_reason: Union[str, None]) -> str:
    chunk = {
        "id": id,
        "object": "chat.completion.chunk",
        "created": created,
        "model": model,
        "choices": [{
            "index": 0,
            "delta": delta,
            "logprobs": None,  # OpenAI 标准字段
            "finish_reason": finish_reason
        }],
        "system_fingerprint": None  # OpenAI 标准字段（可选）
    }
    return json.dumps(chunk)

# ---------- 辅助函数 ----------

def get_admin_template_data(request: Request):
    """获取管理页面模板数据（避免重复代码）"""
    return prepare_admin_template_data(
        request, multi_account_mgr, log_buffer, log_lock,
        api_key=API_KEY, base_url=BASE_URL, proxy=PROXY,
        logo_url=LOGO_URL, chat_url=CHAT_URL, path_prefix=PATH_PREFIX,
        max_new_session_tries=MAX_NEW_SESSION_TRIES,
        max_request_retries=MAX_REQUEST_RETRIES,
        max_account_switch_tries=MAX_ACCOUNT_SWITCH_TRIES,
        account_failure_threshold=ACCOUNT_FAILURE_THRESHOLD,
        rate_limit_cooldown_seconds=RATE_LIMIT_COOLDOWN_SECONDS,
        session_cache_ttl_seconds=SESSION_CACHE_TTL_SECONDS
    )

# ---------- 路由定义 ----------

@app.get("/")
async def home(request: Request):
    """首页 - 根据PATH_PREFIX配置决定行为"""
    if PATH_PREFIX:
        # 如果设置了PATH_PREFIX（隐藏模式），首页返回404，不暴露任何信息
        raise HTTPException(404, "Not Found")
    else:
        # 未设置PATH_PREFIX（公开模式），根据登录状态重定向
        if is_logged_in(request):
            template_data = get_admin_template_data(request)
            return templates.TemplateResponse("admin/index.html", template_data)
        else:
            return RedirectResponse(url="/login", status_code=302)

# ---------- 登录/登出端点（支持可选PATH_PREFIX） ----------

# 不带PATH_PREFIX的登录端点
@app.get("/login")
async def admin_login_get(request: Request, error: str = None):
    """登录页面"""
    return templates.TemplateResponse("auth/login.html", {"request": request, "error": error})

@app.post("/login")
async def admin_login_post(request: Request, admin_key: str = Form(...)):
    """处理登录表单提交"""
    if admin_key == ADMIN_KEY:
        login_user(request)
        logger.info(f"[AUTH] 管理员登录成功")
        return RedirectResponse(url="/", status_code=302)
    else:
        logger.warning(f"[AUTH] 登录失败 - 密钥错误")
        return templates.TemplateResponse("auth/login.html", {"request": request, "error": "密钥错误，请重试"})

@app.post("/logout")
@require_login(redirect_to_login=False)
async def admin_logout(request: Request):
    """登出"""
    logout_user(request)
    logger.info(f"[AUTH] 管理员已登出")
    return RedirectResponse(url="/login", status_code=302)

# 带PATH_PREFIX的登录端点（如果配置了PATH_PREFIX）
if PATH_PREFIX:
    @app.get(f"/{PATH_PREFIX}/login")
    async def admin_login_get_prefixed(request: Request, error: str = None):
        """登录页面（带前缀）"""
        return templates.TemplateResponse("auth/login.html", {"request": request, "error": error})

    @app.post(f"/{PATH_PREFIX}/login")
    async def admin_login_post_prefixed(request: Request, admin_key: str = Form(...)):
        """处理登录表单提交（带前缀）"""
        if admin_key == ADMIN_KEY:
            login_user(request)
            logger.info(f"[AUTH] 管理员登录成功")
            return RedirectResponse(url=f"/{PATH_PREFIX}", status_code=302)
        else:
            logger.warning(f"[AUTH] 登录失败 - 密钥错误")
            return templates.TemplateResponse("auth/login.html", {"request": request, "error": "密钥错误，请重试"})

    @app.post(f"/{PATH_PREFIX}/logout")
    @require_login(redirect_to_login=False)
    async def admin_logout_prefixed(request: Request):
        """登出（带前缀）"""
        logout_user(request)
        logger.info(f"[AUTH] 管理员已登出")
        return RedirectResponse(url=f"/{PATH_PREFIX}/login", status_code=302)

# ---------- 管理端点（需要登录） ----------

# 不带PATH_PREFIX的管理端点
@app.get("/admin")
@require_login()
async def admin_home_no_prefix(request: Request):
    """管理首页"""
    template_data = get_admin_template_data(request)
    return templates.TemplateResponse("admin/index.html", template_data)

# 带PATH_PREFIX的管理端点（如果配置了PATH_PREFIX）
if PATH_PREFIX:
    @app.get(f"/{PATH_PREFIX}")
    @require_login()
    async def admin_home_prefixed(request: Request):
        """管理首页（带前缀）"""
        return await admin_home_no_prefix(request=request)

# ---------- 管理API端点（需要登录） ----------

@app.get("/admin/health")
@require_login()
async def admin_health(request: Request):
    return {"status": "ok", "time": datetime.utcnow().isoformat()}

@app.get("/admin/accounts")
@require_login()
async def admin_get_accounts(request: Request):
    """获取所有账户的状态信息"""
    accounts_info = []
    for account_id, account_manager in multi_account_mgr.accounts.items():
        config = account_manager.config
        remaining_hours = config.get_remaining_hours()
        status, status_color, remaining_display = format_account_expiration(remaining_hours)
        cooldown_seconds, cooldown_reason = account_manager.get_cooldown_info()

        accounts_info.append({
            "id": config.account_id,
            "status": status,
            "expires_at": config.expires_at or "未设置",
            "remaining_hours": remaining_hours,
            "remaining_display": remaining_display,
            "is_available": account_manager.is_available,
            "error_count": account_manager.error_count,
            "disabled": config.disabled,
            "cooldown_seconds": cooldown_seconds,
            "cooldown_reason": cooldown_reason,
            "conversation_count": account_manager.conversation_count
        })

    return {"total": len(accounts_info), "accounts": accounts_info}

@app.get("/admin/accounts-config")
@require_login()
async def admin_get_config(request: Request):
    """获取完整账户配置"""
    try:
        accounts_data = load_accounts_from_source()
        return {"accounts": accounts_data}
    except Exception as e:
        logger.error(f"[CONFIG] 获取配置失败: {str(e)}")
        raise HTTPException(500, f"获取失败: {str(e)}")

@app.put("/admin/accounts-config")
@require_login()
async def admin_update_config(request: Request, accounts_data: list = Body(...)):
    """更新整个账户配置"""
    global multi_account_mgr
    try:
        multi_account_mgr = _update_accounts_config(
            accounts_data, multi_account_mgr, http_client, USER_AGENT,
            ACCOUNT_FAILURE_THRESHOLD, RATE_LIMIT_COOLDOWN_SECONDS,
            SESSION_CACHE_TTL_SECONDS, global_stats
        )
        return {"status": "success", "message": "配置已更新", "account_count": len(multi_account_mgr.accounts)}
    except Exception as e:
        logger.error(f"[CONFIG] 更新配置失败: {str(e)}")
        raise HTTPException(500, f"更新失败: {str(e)}")

@app.delete("/admin/accounts/{account_id}")
@require_login()
async def admin_delete_account(request: Request, account_id: str):
    """删除单个账户"""
    global multi_account_mgr
    try:
        multi_account_mgr = _delete_account(
            account_id, multi_account_mgr, http_client, USER_AGENT,
            ACCOUNT_FAILURE_THRESHOLD, RATE_LIMIT_COOLDOWN_SECONDS,
            SESSION_CACHE_TTL_SECONDS, global_stats
        )
        return {"status": "success", "message": f"账户 {account_id} 已删除", "account_count": len(multi_account_mgr.accounts)}
    except Exception as e:
        logger.error(f"[CONFIG] 删除账户失败: {str(e)}")
        raise HTTPException(500, f"删除失败: {str(e)}")

@app.put("/admin/accounts/{account_id}/disable")
@require_login()
async def admin_disable_account(request: Request, account_id: str):
    """手动禁用账户"""
    global multi_account_mgr
    try:
        multi_account_mgr = _update_account_disabled_status(
            account_id, True, multi_account_mgr, http_client, USER_AGENT,
            ACCOUNT_FAILURE_THRESHOLD, RATE_LIMIT_COOLDOWN_SECONDS,
            SESSION_CACHE_TTL_SECONDS, global_stats
        )
        return {"status": "success", "message": f"账户 {account_id} 已禁用", "account_count": len(multi_account_mgr.accounts)}
    except Exception as e:
        logger.error(f"[CONFIG] 禁用账户失败: {str(e)}")
        raise HTTPException(500, f"禁用失败: {str(e)}")

@app.put("/admin/accounts/{account_id}/enable")
@require_login()
async def admin_enable_account(request: Request, account_id: str):
    """启用账户"""
    global multi_account_mgr
    try:
        multi_account_mgr = _update_account_disabled_status(
            account_id, False, multi_account_mgr, http_client, USER_AGENT,
            ACCOUNT_FAILURE_THRESHOLD, RATE_LIMIT_COOLDOWN_SECONDS,
            SESSION_CACHE_TTL_SECONDS, global_stats
        )
        return {"status": "success", "message": f"账户 {account_id} 已启用", "account_count": len(multi_account_mgr.accounts)}
    except Exception as e:
        logger.error(f"[CONFIG] 启用账户失败: {str(e)}")
        raise HTTPException(500, f"启用失败: {str(e)}")

# ---------- 系统设置 API ----------
@app.get("/admin/settings")
@require_login()
async def admin_get_settings(request: Request):
    """获取系统设置"""
    # 返回当前配置（转换为字典格式）
    return {
        "basic": {
            "api_key": config.basic.api_key,
            "base_url": config.basic.base_url,
            "proxy": config.basic.proxy
        },
        "image_generation": {
            "enabled": config.image_generation.enabled,
            "supported_models": config.image_generation.supported_models
        },
        "retry": {
            "max_new_session_tries": config.retry.max_new_session_tries,
            "max_request_retries": config.retry.max_request_retries,
            "max_account_switch_tries": config.retry.max_account_switch_tries,
            "account_failure_threshold": config.retry.account_failure_threshold,
            "rate_limit_cooldown_seconds": config.retry.rate_limit_cooldown_seconds,
            "session_cache_ttl_seconds": config.retry.session_cache_ttl_seconds
        },
        "public_display": {
            "logo_url": config.public_display.logo_url,
            "chat_url": config.public_display.chat_url
        },
        "session": {
            "expire_hours": config.session.expire_hours
        }
    }

@app.put("/admin/settings")
@require_login()
async def admin_update_settings(request: Request, new_settings: dict = Body(...)):
    """更新系统设置"""
    global API_KEY, PROXY, BASE_URL, LOGO_URL, CHAT_URL
    global IMAGE_GENERATION_ENABLED, IMAGE_GENERATION_MODELS
    global MAX_NEW_SESSION_TRIES, MAX_REQUEST_RETRIES, MAX_ACCOUNT_SWITCH_TRIES
    global ACCOUNT_FAILURE_THRESHOLD, RATE_LIMIT_COOLDOWN_SECONDS, SESSION_CACHE_TTL_SECONDS
    global SESSION_EXPIRE_HOURS, multi_account_mgr, http_client

    try:
        # 保存旧配置用于对比
        old_proxy = PROXY
        old_retry_config = {
            "account_failure_threshold": ACCOUNT_FAILURE_THRESHOLD,
            "rate_limit_cooldown_seconds": RATE_LIMIT_COOLDOWN_SECONDS,
            "session_cache_ttl_seconds": SESSION_CACHE_TTL_SECONDS
        }

        # 保存到 YAML
        config_manager.save_yaml(new_settings)

        # 热更新配置
        config_manager.reload()

        # 更新全局变量（实时生效）
        API_KEY = config.basic.api_key
        PROXY = config.basic.proxy
        BASE_URL = config.basic.base_url
        LOGO_URL = config.public_display.logo_url
        CHAT_URL = config.public_display.chat_url
        IMAGE_GENERATION_ENABLED = config.image_generation.enabled
        IMAGE_GENERATION_MODELS = config.image_generation.supported_models
        MAX_NEW_SESSION_TRIES = config.retry.max_new_session_tries
        MAX_REQUEST_RETRIES = config.retry.max_request_retries
        MAX_ACCOUNT_SWITCH_TRIES = config.retry.max_account_switch_tries
        ACCOUNT_FAILURE_THRESHOLD = config.retry.account_failure_threshold
        RATE_LIMIT_COOLDOWN_SECONDS = config.retry.rate_limit_cooldown_seconds
        SESSION_CACHE_TTL_SECONDS = config.retry.session_cache_ttl_seconds
        SESSION_EXPIRE_HOURS = config.session.expire_hours

        # 检查是否需要重建 HTTP 客户端（代理变化）
        if old_proxy != PROXY:
            logger.info(f"[CONFIG] 代理配置已变化，重建 HTTP 客户端")
            await http_client.aclose()  # 关闭旧客户端
            http_client = httpx.AsyncClient(
                proxy=PROXY or None,
                verify=False,
                http2=False,
                timeout=httpx.Timeout(TIMEOUT_SECONDS, connect=60.0),
                limits=httpx.Limits(
                    max_keepalive_connections=100,
                    max_connections=200
                )
            )

        # 检查是否需要更新账户管理器配置（重试策略变化）
        retry_changed = (
            old_retry_config["account_failure_threshold"] != ACCOUNT_FAILURE_THRESHOLD or
            old_retry_config["rate_limit_cooldown_seconds"] != RATE_LIMIT_COOLDOWN_SECONDS or
            old_retry_config["session_cache_ttl_seconds"] != SESSION_CACHE_TTL_SECONDS
        )

        if retry_changed:
            logger.info(f"[CONFIG] 重试策略已变化，更新账户管理器配置")
            # 更新所有账户管理器的配置
            multi_account_mgr.session_cache_ttl_seconds = SESSION_CACHE_TTL_SECONDS
            for account_id, account_mgr in multi_account_mgr.accounts.items():
                account_mgr.account_failure_threshold = ACCOUNT_FAILURE_THRESHOLD
                account_mgr.rate_limit_cooldown_seconds = RATE_LIMIT_COOLDOWN_SECONDS

        logger.info(f"[CONFIG] 系统设置已更新并实时生效")
        return {"status": "success", "message": "设置已保存并实时生效！"}
    except Exception as e:
        logger.error(f"[CONFIG] 更新设置失败: {str(e)}")
        raise HTTPException(500, f"更新失败: {str(e)}")

@app.get("/admin/log")
@require_login()
async def admin_get_logs(
    request: Request,
    limit: int = 1500,
    level: str = None,
    search: str = None,
    start_time: str = None,
    end_time: str = None
):
    with log_lock:
        logs = list(log_buffer)

    stats_by_level = {}
    error_logs = []
    chat_count = 0
    for log in logs:
        level_name = log.get("level", "INFO")
        stats_by_level[level_name] = stats_by_level.get(level_name, 0) + 1
        if level_name in ["ERROR", "CRITICAL"]:
            error_logs.append(log)
        if "收到请求" in log.get("message", ""):
            chat_count += 1

    if level:
        level = level.upper()
        logs = [log for log in logs if log["level"] == level]
    if search:
        logs = [log for log in logs if search.lower() in log["message"].lower()]
    if start_time:
        logs = [log for log in logs if log["time"] >= start_time]
    if end_time:
        logs = [log for log in logs if log["time"] <= end_time]

    limit = min(limit, 3000)
    filtered_logs = logs[-limit:]

    return {
        "total": len(filtered_logs),
        "limit": limit,
        "filters": {"level": level, "search": search, "start_time": start_time, "end_time": end_time},
        "logs": filtered_logs,
        "stats": {
            "memory": {"total": len(log_buffer), "by_level": stats_by_level, "capacity": log_buffer.maxlen},
            "errors": {"count": len(error_logs), "recent": error_logs[-10:]},
            "chat_count": chat_count
        }
    }

@app.delete("/admin/log")
@require_login()
async def admin_clear_logs(request: Request, confirm: str = None):
    if confirm != "yes":
        raise HTTPException(400, "需要 confirm=yes 参数确认清空操作")
    with log_lock:
        cleared_count = len(log_buffer)
        log_buffer.clear()
    logger.info("[LOG] 日志已清空")
    return {"status": "success", "message": "已清空内存日志", "cleared_count": cleared_count}

@app.get("/admin/log/html")
@require_login()
async def admin_logs_html_route(request: Request):
    """返回美化的 HTML 日志查看界面"""
    return templates.TemplateResponse("admin/logs.html", {"request": request})

# 带PATH_PREFIX的管理API端点（如果配置了PATH_PREFIX）
if PATH_PREFIX:
    @app.get(f"/{PATH_PREFIX}/health")
    @require_login()
    async def admin_health_prefixed(request: Request):
        return await admin_health(request=request)

    @app.get(f"/{PATH_PREFIX}/accounts")
    @require_login()
    async def admin_get_accounts_prefixed(request: Request):
        return await admin_get_accounts(request=request)

    @app.get(f"/{PATH_PREFIX}/accounts-config")
    @require_login()
    async def admin_get_config_prefixed(request: Request):
        return await admin_get_config(request=request)

    @app.put(f"/{PATH_PREFIX}/accounts-config")
    @require_login()
    async def admin_update_config_prefixed(request: Request, accounts_data: list = Body(...)):
        return await admin_update_config(request=request, accounts_data=accounts_data)

    @app.delete(f"/{PATH_PREFIX}/accounts/{{account_id}}")
    @require_login()
    async def admin_delete_account_prefixed(request: Request, account_id: str):
        return await admin_delete_account(request=request, account_id=account_id)

    @app.put(f"/{PATH_PREFIX}/accounts/{{account_id}}/disable")
    @require_login()
    async def admin_disable_account_prefixed(request: Request, account_id: str):
        return await admin_disable_account(request=request, account_id=account_id)

    @app.put(f"/{PATH_PREFIX}/accounts/{{account_id}}/enable")
    @require_login()
    async def admin_enable_account_prefixed(request: Request, account_id: str):
        return await admin_enable_account(request=request, account_id=account_id)

    @app.get(f"/{PATH_PREFIX}/log")
    @require_login()
    async def admin_get_logs_prefixed(
        request: Request,
        limit: int = 1500,
        level: str = None,
        search: str = None,
        start_time: str = None,
        end_time: str = None
    ):
        return await admin_get_logs(request=request, limit=limit, level=level, search=search, start_time=start_time, end_time=end_time)

    @app.delete(f"/{PATH_PREFIX}/log")
    @require_login()
    async def admin_clear_logs_prefixed(request: Request, confirm: str = None):
        return await admin_clear_logs(request=request, confirm=confirm)

    @app.get(f"/{PATH_PREFIX}/log/html")
    @require_login()
    async def admin_logs_html_route_prefixed(request: Request):
        return await admin_logs_html_route(request=request)

    @app.get(f"/{PATH_PREFIX}/settings")
    @require_login()
    async def admin_get_settings_prefixed(request: Request):
        return await admin_get_settings(request=request)

    @app.put(f"/{PATH_PREFIX}/settings")
    @require_login()
    async def admin_update_settings_prefixed(request: Request, new_settings: dict = Body(...)):
        return await admin_update_settings(request=request, new_settings=new_settings)

# ---------- API端点（API Key认证） ----------

@app.get("/v1/models")
async def list_models(authorization: str = Header(None)):
    verify_api_key(API_KEY, authorization)
    data = []
    now = int(time.time())
    for m in MODEL_MAPPING.keys():
        data.append({"id": m, "object": "model", "created": now, "owned_by": "google", "permission": []})
    return {"object": "list", "data": data}

@app.get("/v1/models/{model_id}")
async def get_model(model_id: str, authorization: str = Header(None)):
    verify_api_key(API_KEY, authorization)
    return {"id": model_id, "object": "model"}

# 带PATH_PREFIX的API端点（如果配置了PATH_PREFIX）
if PATH_PREFIX:
    @app.get(f"/{PATH_PREFIX}/v1/models")
    async def list_models_prefixed(authorization: str = Header(None)):
        return await list_models(authorization)

    @app.get(f"/{PATH_PREFIX}/v1/models/{{model_id}}")
    async def get_model_prefixed(model_id: str, authorization: str = Header(None)):
        return await get_model(model_id, authorization)

# ---------- 聊天API端点 ----------

@app.post("/v1/chat/completions")
async def chat(
    req: ChatRequest,
    request: Request,
    authorization: Optional[str] = Header(None)
):
    # API Key 验证
    verify_api_key(API_KEY, authorization)
    # ... (保留原有的chat逻辑)
    return await chat_impl(req, request, authorization)

if PATH_PREFIX:
    @app.post(f"/{PATH_PREFIX}/v1/chat/completions")
    async def chat_prefixed(
        req: ChatRequest,
        request: Request,
        authorization: Optional[str] = Header(None)
    ):
        return await chat(req, request, authorization)

# chat实现函数
async def chat_impl(
    req: ChatRequest,
    request: Request,
    authorization: Optional[str]
):
    # 生成请求ID（最优先，用于所有日志追踪）
    request_id = str(uuid.uuid4())[:6]

    # 获取客户端IP（用于会话隔离）
    client_ip = request.headers.get("x-forwarded-for")
    if client_ip:
        client_ip = client_ip.split(",")[0].strip()
    else:
        client_ip = request.client.host if request.client else "unknown"

    # 记录请求统计
    async with stats_lock:
        global_stats["total_requests"] += 1
        global_stats["request_timestamps"].append(time.time())
        await save_stats(global_stats)

    # 2. 模型校验
    if req.model not in MODEL_MAPPING:
        logger.error(f"[CHAT] [req_{request_id}] 不支持的模型: {req.model}")
        raise HTTPException(
            status_code=404,
            detail=f"Model '{req.model}' not found. Available models: {list(MODEL_MAPPING.keys())}"
        )

    # 保存模型信息到 request.state（用于 Uptime 追踪）
    request.state.model = req.model

    # 3. 生成会话指纹，获取Session锁（防止同一对话的并发请求冲突）
    conv_key = get_conversation_key([m.model_dump() for m in req.messages], client_ip)
    session_lock = await multi_account_mgr.acquire_session_lock(conv_key)

    # 4. 在锁的保护下检查缓存和处理Session（保证同一对话的请求串行化）
    async with session_lock:
        cached_session = multi_account_mgr.global_session_cache.get(conv_key)

        if cached_session:
            # 使用已绑定的账户
            account_id = cached_session["account_id"]
            account_manager = await multi_account_mgr.get_account(account_id, request_id)
            google_session = cached_session["session_id"]
            is_new_conversation = False
            logger.info(f"[CHAT] [{account_id}] [req_{request_id}] 继续会话: {google_session[-12:]}")
        else:
            # 新对话：轮询选择可用账户，失败时尝试其他账户
            max_account_tries = min(MAX_NEW_SESSION_TRIES, len(multi_account_mgr.accounts))
            last_error = None

            for attempt in range(max_account_tries):
                try:
                    account_manager = await multi_account_mgr.get_account(None, request_id)
                    google_session = await create_google_session(account_manager, http_client, USER_AGENT, request_id)
                    # 线程安全地绑定账户到此对话
                    await multi_account_mgr.set_session_cache(
                        conv_key,
                        account_manager.config.account_id,
                        google_session
                    )
                    is_new_conversation = True
                    logger.info(f"[CHAT] [{account_manager.config.account_id}] [req_{request_id}] 新会话创建并绑定账户")
                    # 记录账号池状态（账户可用）
                    uptime_tracker.record_request("account_pool", True)
                    break
                except Exception as e:
                    last_error = e
                    error_type = type(e).__name__
                    # 安全获取账户ID
                    account_id = account_manager.config.account_id if 'account_manager' in locals() and account_manager else 'unknown'
                    logger.error(f"[CHAT] [req_{request_id}] 账户 {account_id} 创建会话失败 (尝试 {attempt + 1}/{max_account_tries}) - {error_type}: {str(e)}")
                    # 记录账号池状态（单个账户失败）
                    uptime_tracker.record_request("account_pool", False)
                    if attempt == max_account_tries - 1:
                        logger.error(f"[CHAT] [req_{request_id}] 所有账户均不可用")
                        raise HTTPException(503, f"All accounts unavailable: {str(last_error)[:100]}")
                    # 继续尝试下一个账户

    # 提取用户消息内容用于日志
    if req.messages:
        last_content = req.messages[-1].content
        if isinstance(last_content, str):
            # 显示完整消息，但限制在500字符以内
            if len(last_content) > 500:
                preview = last_content[:500] + "...(已截断)"
            else:
                preview = last_content
        else:
            preview = f"[多模态: {len(last_content)}部分]"
    else:
        preview = "[空消息]"

    # 记录请求基本信息
    logger.info(f"[CHAT] [{account_manager.config.account_id}] [req_{request_id}] 收到请求: {req.model} | {len(req.messages)}条消息 | stream={req.stream}")

    # 单独记录用户消息内容（方便查看）
    logger.info(f"[CHAT] [{account_manager.config.account_id}] [req_{request_id}] 用户消息: {preview}")

    # 3. 解析请求内容
    last_text, current_images = await parse_last_message(req.messages, http_client, request_id)

    # 4. 准备文本内容
    if is_new_conversation:
        # 新对话只发送最后一条
        text_to_send = last_text
        is_retry_mode = True
    else:
        # 继续对话只发送当前消息
        text_to_send = last_text
        is_retry_mode = False
        # 线程安全地更新时间戳
        await multi_account_mgr.update_session_time(conv_key)

    chat_id = f"chatcmpl-{uuid.uuid4()}"
    created_time = int(time.time())

    # 封装生成器 (含图片上传和重试逻辑)
    async def response_wrapper():
        nonlocal account_manager  # 允许修改外层的 account_manager

        retry_count = 0
        max_retries = MAX_REQUEST_RETRIES  # 使用配置的最大重试次数

        current_text = text_to_send
        current_retry_mode = is_retry_mode

        # 图片 ID 列表 (每次 Session 变化都需要重新上传，因为 fileId 绑定在 Session 上)
        current_file_ids = []

        # 记录已失败的账户，避免重复使用
        failed_accounts = set()

        # 重试逻辑：最多尝试 max_retries+1 次（初次+重试）
        while retry_count <= max_retries:
            try:
                # 安全：使用.get()防止缓存被清理导致KeyError
                cached = multi_account_mgr.global_session_cache.get(conv_key)
                if not cached:
                    logger.warning(f"[CHAT] [{account_manager.config.account_id}] [req_{request_id}] 缓存已清理，重建Session")
                    new_sess = await create_google_session(account_manager, http_client, USER_AGENT, request_id)
                    await multi_account_mgr.set_session_cache(
                        conv_key,
                        account_manager.config.account_id,
                        new_sess
                    )
                    current_session = new_sess
                    current_retry_mode = True
                    current_file_ids = []
                else:
                    current_session = cached["session_id"]

                # A. 如果有图片且还没上传到当前 Session，先上传
                # 注意：每次重试如果是新 Session，都需要重新上传图片
                if current_images and not current_file_ids:
                    for img in current_images:
                        fid = await upload_context_file(current_session, img["mime"], img["data"], account_manager, http_client, USER_AGENT, request_id)
                        current_file_ids.append(fid)

                # B. 准备文本 (重试模式下发全文)
                if current_retry_mode:
                    current_text = build_full_context_text(req.messages)

                # C. 发起对话
                async for chunk in stream_chat_generator(
                    current_session,
                    current_text,
                    current_file_ids,
                    req.model,
                    chat_id,
                    created_time,
                    account_manager,
                    req.stream,
                    request_id,
                    request
                ):
                    yield chunk

                # 请求成功，重置账户失败计数
                account_manager.is_available = True
                account_manager.error_count = 0
                account_manager.conversation_count += 1  # 增加对话次数

                # 记录账号池状态（请求成功）
                uptime_tracker.record_request("account_pool", True)

                # 保存对话次数到统计数据
                async with stats_lock:
                    if "account_conversations" not in global_stats:
                        global_stats["account_conversations"] = {}
                    global_stats["account_conversations"][account_manager.config.account_id] = account_manager.conversation_count
                    await save_stats(global_stats)

                break

            except (httpx.HTTPError, ssl.SSLError, HTTPException) as e:
                # 记录当前失败的账户
                failed_accounts.add(account_manager.config.account_id)

                # 记录账号池状态（请求失败）
                uptime_tracker.record_request("account_pool", False)

                # 检查是否为429错误（Rate Limit）
                is_rate_limit = isinstance(e, HTTPException) and e.status_code == 429

                # 增加账户失败计数（触发熔断机制）
                account_manager.last_error_time = time.time()
                if is_rate_limit:
                    account_manager.last_429_time = time.time()

                account_manager.error_count += 1
                if account_manager.error_count >= ACCOUNT_FAILURE_THRESHOLD:
                    account_manager.is_available = False
                    if is_rate_limit:
                        logger.error(f"[ACCOUNT] [{account_manager.config.account_id}] [req_{request_id}] 遇到429错误{account_manager.error_count}次，账户已禁用（需休息{RATE_LIMIT_COOLDOWN_SECONDS}秒）")
                    else:
                        logger.error(f"[ACCOUNT] [{account_manager.config.account_id}] [req_{request_id}] 请求连续失败{account_manager.error_count}次，账户已永久禁用")

                retry_count += 1

                # 详细记录错误信息
                error_type = type(e).__name__
                error_detail = str(e)

                # 特殊处理HTTPException，提取状态码和详情
                if isinstance(e, HTTPException):
                    if is_rate_limit:
                        logger.error(f"[CHAT] [{account_manager.config.account_id}] [req_{request_id}] 遇到429限流错误，账户将休息{RATE_LIMIT_COOLDOWN_SECONDS}秒")
                    else:
                        logger.error(f"[CHAT] [{account_manager.config.account_id}] [req_{request_id}] HTTP错误 {e.status_code}: {e.detail}")
                else:
                    logger.error(f"[CHAT] [{account_manager.config.account_id}] [req_{request_id}] {error_type}: {error_detail}")

                # 检查是否还能继续重试
                if retry_count <= max_retries:
                    logger.warning(f"[CHAT] [{account_manager.config.account_id}] [req_{request_id}] 正在重试 ({retry_count}/{max_retries})")
                    # 尝试切换到其他账户（客户端会传递完整上下文）
                    try:
                        # 获取新账户，跳过已失败的账户
                        max_account_tries = MAX_ACCOUNT_SWITCH_TRIES  # 使用配置的账户切换尝试次数
                        new_account = None

                        for _ in range(max_account_tries):
                            candidate = await multi_account_mgr.get_account(None, request_id)
                            if candidate.config.account_id not in failed_accounts:
                                new_account = candidate
                                break

                        if not new_account:
                            logger.error(f"[CHAT] [req_{request_id}] 所有账户均已失败，无可用账户")
                            if req.stream: yield f"data: {json.dumps({'error': {'message': 'All Accounts Failed'}})}\n\n"
                            return

                        logger.info(f"[CHAT] [req_{request_id}] 切换账户: {account_manager.config.account_id} -> {new_account.config.account_id}")

                        # 创建新 Session
                        new_sess = await create_google_session(new_account, http_client, USER_AGENT, request_id)

                        # 更新缓存绑定到新账户
                        await multi_account_mgr.set_session_cache(
                            conv_key,
                            new_account.config.account_id,
                            new_sess
                        )

                        # 更新账户管理器
                        account_manager = new_account

                        # 设置重试模式（发送完整上下文）
                        current_retry_mode = True
                        current_file_ids = []  # 清空 ID，强制重新上传到新 Session

                    except Exception as create_err:
                        error_type = type(create_err).__name__
                        logger.error(f"[CHAT] [req_{request_id}] 账户切换失败 ({error_type}): {str(create_err)}")
                        # 记录账号池状态（账户切换失败）
                        uptime_tracker.record_request("account_pool", False)
                        if req.stream: yield f"data: {json.dumps({'error': {'message': 'Account Failover Failed'}})}\n\n"
                        return
                else:
                    # 已达到最大重试次数
                    logger.error(f"[CHAT] [req_{request_id}] 已达到最大重试次数 ({max_retries})，请求失败")
                    if req.stream: yield f"data: {json.dumps({'error': {'message': f'Max retries ({max_retries}) exceeded: {e}'}})}\n\n"
                    return

    if req.stream:
        return StreamingResponse(response_wrapper(), media_type="text/event-stream")
    
    full_content = ""
    full_reasoning = ""
    async for chunk_str in response_wrapper():
        if chunk_str.startswith("data: [DONE]"): break
        if chunk_str.startswith("data: "):
            try:
                data = json.loads(chunk_str[6:])
                delta = data["choices"][0]["delta"]
                if "content" in delta:
                    full_content += delta["content"]
                if "reasoning_content" in delta:
                    full_reasoning += delta["reasoning_content"]
            except json.JSONDecodeError as e:
                logger.error(f"[CHAT] [{account_manager.config.account_id}] [req_{request_id}] JSON解析失败: {str(e)}")
            except (KeyError, IndexError) as e:
                logger.error(f"[CHAT] [{account_manager.config.account_id}] [req_{request_id}] 响应格式错误 ({type(e).__name__}): {str(e)}")

    # 构建响应消息
    message = {"role": "assistant", "content": full_content}
    if full_reasoning:
        message["reasoning_content"] = full_reasoning

    # 非流式请求完成日志
    logger.info(f"[CHAT] [{account_manager.config.account_id}] [req_{request_id}] 非流式响应完成")

    # 记录响应内容（限制500字符）
    response_preview = full_content[:500] + "...(已截断)" if len(full_content) > 500 else full_content
    logger.info(f"[CHAT] [{account_manager.config.account_id}] [req_{request_id}] AI响应: {response_preview}")

    return {
        "id": chat_id,
        "object": "chat.completion",
        "created": created_time,
        "model": req.model,
        "choices": [{"index": 0, "message": message, "finish_reason": "stop"}],
        "usage": {"prompt_tokens": 0, "completion_tokens": 0, "total_tokens": 0}
    }

# ---------- 图片生成处理函数 ----------
def parse_images_from_response(data_list: list) -> tuple[list, str]:
    """从API响应中解析图片文件引用
    返回: (file_ids_list, session_name)
    file_ids_list: [{"fileId": str, "mimeType": str}, ...]
    """
    file_ids = []
    session_name = ""

    for data in data_list:
        sar = data.get("streamAssistResponse")
        if not sar:
            continue

        # 获取session信息（优先使用最新的）
        session_info = sar.get("sessionInfo", {})
        if session_info.get("session"):
            session_name = session_info["session"]

        answer = sar.get("answer") or {}
        replies = answer.get("replies") or []

        for reply in replies:
            gc = reply.get("groundedContent", {})
            content = gc.get("content", {})

            # 检查file字段（图片生成的关键）
            file_info = content.get("file")
            if file_info and file_info.get("fileId"):
                file_ids.append({
                    "fileId": file_info["fileId"],
                    "mimeType": file_info.get("mimeType", "image/png")
                })

    return file_ids, session_name


async def stream_chat_generator(session: str, text_content: str, file_ids: List[str], model_name: str, chat_id: str, created_time: int, account_manager: AccountManager, is_stream: bool = True, request_id: str = "", request: Request = None):
    start_time = time.time()

    # 记录发送给API的内容
    text_preview = text_content[:500] + "...(已截断)" if len(text_content) > 500 else text_content
    logger.info(f"[API] [{account_manager.config.account_id}] [req_{request_id}] 发送内容: {text_preview}")
    if file_ids:
        logger.info(f"[API] [{account_manager.config.account_id}] [req_{request_id}] 附带文件: {len(file_ids)}个")

    jwt = await account_manager.get_jwt(request_id)
    headers = get_common_headers(jwt, USER_AGENT)

    # 构建 toolsSpec（根据配置决定是否启用图片生成）
    tools_spec = {
        "webGroundingSpec": {},
        "toolRegistry": "default_tool_registry",
    }
    # 只在启用且模型支持时添加图片生成
    if IMAGE_GENERATION_ENABLED and model_name in IMAGE_GENERATION_MODELS:
        tools_spec["imageGenerationSpec"] = {}
        tools_spec["videoGenerationSpec"] = {}

    body = {
        "configId": account_manager.config.config_id,
        "additionalParams": {"token": "-"},
        "streamAssistRequest": {
            "session": session,
            "query": {"parts": [{"text": text_content}]},
            "filter": "",
            "fileIds": file_ids, # 注入文件 ID
            "answerGenerationMode": "NORMAL",
            "toolsSpec": tools_spec,
            "languageCode": "zh-CN",
            "userMetadata": {"timeZone": "Asia/Shanghai"},
            "assistSkippingMode": "REQUEST_ASSIST"
        }
    }

    target_model_id = MODEL_MAPPING.get(model_name)
    if target_model_id:
        body["streamAssistRequest"]["assistGenerationConfig"] = {
            "modelId": target_model_id
        }

    if is_stream:
        chunk = create_chunk(chat_id, created_time, model_name, {"role": "assistant"}, None)
        yield f"data: {chunk}\n\n"

    # 使用流式请求
    async with http_client.stream(
        "POST",
        "https://biz-discoveryengine.googleapis.com/v1alpha/locations/global/widgetStreamAssist",
        headers=headers,
        json=body,
    ) as r:
        if r.status_code != 200:
            error_text = await r.aread()
            raise HTTPException(status_code=r.status_code, detail=f"Upstream Error {error_text.decode()}")

        # 使用异步解析器处理 JSON 数组流
        json_objects = []  # 收集所有响应对象用于图片解析
        try:
            async for json_obj in parse_json_array_stream_async(r.aiter_lines()):
                json_objects.append(json_obj)  # 收集响应

                # 提取文本内容
                for reply in json_obj.get("streamAssistResponse", {}).get("answer", {}).get("replies", []):
                    content_obj = reply.get("groundedContent", {}).get("content", {})
                    text = content_obj.get("text", "")

                    if not text:
                        continue

                    # 区分思考过程和正常内容
                    if content_obj.get("thought"):
                        # 思考过程使用 reasoning_content 字段（类似 OpenAI o1）
                        chunk = create_chunk(chat_id, created_time, model_name, {"reasoning_content": text}, None)
                        yield f"data: {chunk}\n\n"
                    else:
                        # 正常内容使用 content 字段
                        chunk = create_chunk(chat_id, created_time, model_name, {"content": text}, None)
                        yield f"data: {chunk}\n\n"

            # 处理图片生成
            if json_objects:
                file_ids, session_name = parse_images_from_response(json_objects)

                if file_ids and session_name:
                    logger.info(f"[IMAGE] [{account_manager.config.account_id}] [req_{request_id}] 检测到{len(file_ids)}张生成图片")

                    try:
                        base_url = get_base_url(request) if request else ""
                        file_metadata = await get_session_file_metadata(account_manager, session_name, http_client, USER_AGENT, request_id)

                        # 并行下载所有图片
                        download_tasks = []
                        for file_info in file_ids:
                            fid = file_info["fileId"]
                            mime = file_info["mimeType"]
                            meta = file_metadata.get(fid, {})
                            correct_session = meta.get("session") or session_name
                            task = download_image_with_jwt(account_manager, correct_session, fid, http_client, USER_AGENT, request_id)
                            download_tasks.append((fid, mime, task))

                        results = await asyncio.gather(*[task for _, _, task in download_tasks], return_exceptions=True)

                        # 处理下载结果
                        for idx, ((fid, mime, _), result) in enumerate(zip(download_tasks, results), 1):
                            if isinstance(result, Exception):
                                logger.error(f"[IMAGE] [{account_manager.config.account_id}] [req_{request_id}] 图片{idx}下载失败: {type(result).__name__}")
                                continue

                            image_url = save_image_to_hf(result, chat_id, fid, mime, base_url, IMAGE_DIR)
                            logger.info(f"[IMAGE] [{account_manager.config.account_id}] [req_{request_id}] 图片{idx}已保存: {image_url}")

                            markdown = f"\n\n![生成的图片]({image_url})\n\n"
                            chunk = create_chunk(chat_id, created_time, model_name, {"content": markdown}, None)
                            yield f"data: {chunk}\n\n"

                    except Exception as e:
                        logger.error(f"[IMAGE] [{account_manager.config.account_id}] [req_{request_id}] 图片处理失败: {str(e)}")

        except ValueError as e:
            logger.error(f"[API] [{account_manager.config.account_id}] [req_{request_id}] JSON解析失败: {str(e)}")
        except Exception as e:
            error_type = type(e).__name__
            logger.error(f"[API] [{account_manager.config.account_id}] [req_{request_id}] 流处理错误 ({error_type}): {str(e)}")
            raise

        total_time = time.time() - start_time
        logger.info(f"[API] [{account_manager.config.account_id}] [req_{request_id}] 响应完成: {total_time:.2f}秒")
    
    if is_stream:
        final_chunk = create_chunk(chat_id, created_time, model_name, {}, "stop")
        yield f"data: {final_chunk}\n\n"
        yield "data: [DONE]\n\n"

# ---------- 公开端点（无需认证） ----------
@app.get("/public/uptime")
async def get_public_uptime(days: int = 90):
    """获取 Uptime 监控数据（JSON格式）"""
    if days < 1 or days > 90:
        days = 90
    return await uptime_tracker.get_uptime_summary(days)

@app.get("/public/uptime/html")
async def get_public_uptime_html(request: Request):
    """Uptime 监控页面（类似 status.openai.com）"""
    return templates.TemplateResponse("public/uptime.html", {"request": request})

@app.get("/public/stats")
async def get_public_stats():
    """获取公开统计信息"""
    async with stats_lock:
        # 清理1小时前的请求时间戳
        current_time = time.time()
        global_stats["request_timestamps"] = [
            ts for ts in global_stats["request_timestamps"]
            if current_time - ts < 3600
        ]

        # 计算每分钟请求数
        recent_minute = [
            ts for ts in global_stats["request_timestamps"]
            if current_time - ts < 60
        ]
        requests_per_minute = len(recent_minute)

        # 计算负载状态
        if requests_per_minute < 10:
            load_status = "low"
            load_color = "#10b981"  # 绿色
        elif requests_per_minute < 30:
            load_status = "medium"
            load_color = "#f59e0b"  # 黄色
        else:
            load_status = "high"
            load_color = "#ef4444"  # 红色

        return {
            "total_visitors": global_stats["total_visitors"],
            "total_requests": global_stats["total_requests"],
            "requests_per_minute": requests_per_minute,
            "load_status": load_status,
            "load_color": load_color
        }

@app.get("/public/log")
async def get_public_logs(request: Request, limit: int = 100):
    """获取脱敏后的日志（JSON格式）"""
    try:
        # 基于IP的访问统计（24小时内去重）
        # 优先从 X-Forwarded-For 获取真实IP（处理代理情况）
        client_ip = request.headers.get("x-forwarded-for")
        if client_ip:
            # X-Forwarded-For 可能包含多个IP，取第一个
            client_ip = client_ip.split(",")[0].strip()
        else:
            # 没有代理时使用直连IP
            client_ip = request.client.host if request.client else "unknown"

        current_time = time.time()

        async with stats_lock:
            # 清理24小时前的IP记录
            if "visitor_ips" not in global_stats:
                global_stats["visitor_ips"] = {}

            expired_ips = [
                ip for ip, timestamp in global_stats["visitor_ips"].items()
                if current_time - timestamp > 86400  # 24小时
            ]
            for ip in expired_ips:
                del global_stats["visitor_ips"][ip]

            # 记录新访问（24小时内同一IP只计数一次）
            if client_ip not in global_stats["visitor_ips"]:
                global_stats["visitor_ips"][client_ip] = current_time

            # 同步访问者计数（清理后的实际数量）
            global_stats["total_visitors"] = len(global_stats["visitor_ips"])
            await save_stats(global_stats)

        sanitized_logs = get_sanitized_logs(limit=min(limit, 1000))
        return {
            "total": len(sanitized_logs),
            "logs": sanitized_logs
        }
    except Exception as e:
        logger.error(f"[LOG] 获取公开日志失败: {e}")
        return {"total": 0, "logs": [], "error": str(e)}

@app.get("/public/log/html")
async def get_public_logs_html(request: Request):
    """公开的脱敏日志查看器"""
    return templates.TemplateResponse("public/logs.html", {
        "request": request,
        "logo_url": LOGO_URL,
        "chat_url": CHAT_URL
    })

# ---------- 全局 404 处理（必须在最后） ----------

@app.exception_handler(404)
async def not_found_handler(request: Request, exc: HTTPException):
    """全局 404 处理器"""
    return JSONResponse(
        status_code=404,
        content={"detail": "Not Found"}
    )

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=7860)