"""云端控制面 HTTP server（首版）。

零第三方依赖，只用 http.server + sqlite3 + 标准库。

分工与边界（以实际代码为准，不夸大）：
- 本 server 只做控制面：项目/任务的创建、查询、取消、心跳、
  stale 任务回收，以及 GitHub/Slack webhook 的验签与解析。
- 本版不直接跑模型回合。任务状态机与 host.py 对齐：
  queued -> running -> completed/failed/interrupted/merged/merge-failed，
  其中 completed/merged 由 worker/控制面后续调用方更新（例如 worker
  调 host.py 跑完回合后回写），本 server 不提供“跑模型”端点。
- 其它已就绪模块（queue 的 order_tasks/ready_tasks、sandbox 的执行器、
  memory 的 MemoryStore、kb 的 KBStore、models 的 ModelRouter、
  cost 的 CostStore、webhooks 的 NotificationService）本版尚未接成
  HTTP 端点，留给 worker 接线时调用；本 server 只接入其中两处：
  AuthStore（认证/权限/审计）与 webhooks 的验签/解析函数。
- DockerExecutor 已接通（见 sandbox.py），CloudExecutor 目前仍是占位
  （见 sandbox.py），本 server 不假装已接通云端执行。

导入规则：只用绝对包导入（from cloud.auth import ...）。绝不要把
cloud/ 目录加进 sys.path：标准库已有 queue 模块，会和 cloud/queue.py
撞名，导致 stdlib queue 被错误模块覆盖。

状态库：单一 SQLite 文件。AuthStore 用 users/project_members/
audit_log 三张表；本 server 用 projects/tasks 两张表，表名不冲突。
并发：ThreadingHTTPServer 多线程处理请求，每个请求内新建 SQLite
连接（server 表用新连接，AuthStore 每次请求新建一个实例），绝不在
多线程 handler 间共用一个连接。

启动：
    python3 -m cloud.server [--host 127.0.0.1] [--port 8765] [--db <路径>]
    后端由 CLOUD_DB_BACKEND 选（sqlite 默认；postgres 已接通，
    驱动缺失时启动即明确报错，见 cloud/db.py）。

测试用 create_server(db_path, host, port) 只返回 ThreadingHTTPServer
实例，不自动 serve。
"""

import argparse
import hashlib
import html
import json
import os
import sqlite3
import threading
import time
import uuid
from collections import deque
from contextlib import contextmanager
from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
from urllib.parse import parse_qs, urlparse

from cloud.auth import AuthStore
from cloud.cost import CostStore
from cloud.db import connect as _db_connect
from cloud.db import create_database as _create_database
from cloud.db import init_postgres_schema as _init_postgres_schema
from cloud.db import PostgresIntegrityError as _PgIntegrityError
from cloud.db import PostgresOperationalError as _PgOperationalError
from cloud.kb import KBStore
from cloud.memory import MemoryStore
from cloud.oauth import (
    OAuthError,
    OAuthStateStore,
    default_userinfo_client,
    handle_oauth_callback,
    map_external_identity_to_local_user_with_key,
    start_oauth_login,
)
from cloud.push import (
    create_subscription as _push_create,
    delete_subscription as _push_delete,
    dispatch_event as _push_dispatch,
    list_subscriptions as _push_list,
)
from cloud.webhooks import (
    WebhookDeliveryStore,
    parse_github_check_run,
    parse_github_pr_comment,
    parse_slack_command,
    verify_github_signature,
    verify_slack_signature,
)

TERMINAL_STATUSES = frozenset(
    {"completed", "failed", "interrupted", "merged", "merge-failed"}
)
DEFAULT_SWEEP_THRESHOLD_SECONDS = 300
# 限流默认值：每 IP / 每 API key 每分钟 120 次；环境变量
# CLOUD_RATE_LIMIT_PER_MINUTE / CLOUD_RATE_LIMIT_WINDOW_SECONDS 可调。
# 限流是内存滑动窗口，不跨进程共享（多 worker 部署时每进程独立计数，
# 这是诚实边界，不是全局限流）。
DEFAULT_RATE_LIMIT_PER_MINUTE = 120
DEFAULT_RATE_LIMIT_WINDOW_SECONDS = 60
TASK_STATUS_KEYS = (
    "queued", "running", "completed", "failed",
    "interrupted", "merged", "merge-failed",
)


def _rate_limit_from_env(name, default):
    try:
        value = int(os.environ.get(name) or default)
    except (TypeError, ValueError):
        return default
    return value if value > 0 else default


class RateLimiter:
    """内存滑动窗口限流：每 key 每窗口最多 per_minute 次。

    只在 allow() 内部持一把短锁做 deque 修剪与计数，不持锁做
    任何 I/O，不会把正常请求串行化。key 由调用方给（本 server
    传“key:<API key 的 sha256>”或“ip:<客户端 IP>”，原始 API key
    绝不存进限流结构里）。窗口与阈值可在实例上改（测试注入小
    阈值验证 429 就靠改这两个属性）。
    """

    def __init__(self, per_minute=DEFAULT_RATE_LIMIT_PER_MINUTE,
                 window_seconds=DEFAULT_RATE_LIMIT_WINDOW_SECONDS,
                 time_fn=None):
        self.per_minute = per_minute
        self.window_seconds = window_seconds
        self._time_fn = time_fn or time.time
        self._lock = threading.Lock()
        self._hits = {}

    def allow(self, key):
        now = self._time_fn()
        window = self.window_seconds
        limit = self.per_minute
        with self._lock:
            queue = self._hits.get(key)
            if queue is None:
                queue = deque()
                self._hits[key] = queue
            cutoff = now - window
            while queue and queue[0] <= cutoff:
                queue.popleft()
            if len(queue) >= limit:
                return False
            queue.append(now)
            # 键数兜底：长期运行的 server 不应让 _hits 无限增长；
            # 超过 10000 个 key 时清掉最久未用的空队列（不影响计数）。
            if len(self._hits) > 10000:
                for old_key in list(self._hits):
                    if not self._hits[old_key]:
                        del self._hits[old_key]
                        break
            return True


def _db_backend_name():
    """当前数据库后端名：环境变量，未设则 sqlite；绝不返回连接串。"""
    return (os.environ.get("CLOUD_DB_BACKEND") or "sqlite").strip().lower()


def _connect(db_path):
    """每个请求新建一个连接；后端按 CLOUD_DB_BACKEND 分发。

    cloud.db.connect() 本身已按环境变量分发：sqlite 时是
    WAL + busy_timeout 的 SQLite 连接；postgres 时是 psycopg
    适配连接（db_path 被忽略，连接参数只走 CLOUD_DB_*
    环境变量，驱动缺失时明确报错，绝不回落）。因此 server
    自身的表与 AuthStore / MemoryStore 等沿用 connect() 的
    调用点在 PG 模式下同样走 Postgres，无需逐一改写。
    """
    return _db_connect(str(db_path))


def migrate_tasks_table(conn):
    """幂等迁移：给老库 tasks 表补新列，不丢数据。

    新列：result_text、error_text、actual_model、started_at、
    finished_at、child_pid。PRAGMA table_info 查现有列，缺哪个
    补哪个；已迁移的库再跑一次是 no-op。worker 写执行结果、
    server 读任务时都依赖这些列存在。
    """
    cols = {row[1] for row in conn.execute(
        "PRAGMA table_info(tasks)").fetchall()}
    new_cols = {
        "result_text": "TEXT",
        "error_text": "TEXT",
        "actual_model": "TEXT",
        "started_at": "REAL",
        "finished_at": "REAL",
        "child_pid": "INTEGER",
    }
    for name, coltype in new_cols.items():
        if name not in cols:
            conn.execute(
                "ALTER TABLE tasks ADD COLUMN %s %s" % (name, coltype))


def _is_postgres_backend():
    backend = os.environ.get("CLOUD_DB_BACKEND") or "sqlite"
    return str(backend).strip().lower() in ("postgres", "postgresql")


def init_db(db_path):
    """创建 server 自己的 projects/tasks 表（AuthStore 的表由其自建）。

    Postgres 模式：建 cloud.db.POSTGRES_SCHEMA 的全部表（其中
    projects/tasks 已含 migrate_tasks_table 的 6 列），再跑一次
    migrate_tasks_table——PRAGMA 翻译后在 PG 上是 no-op，老库
    迁移仍走同一函数。SQLite 模式：原行为不变。
    """
    conn = _connect(db_path)
    try:
        if _is_postgres_backend():
            _init_postgres_schema(conn)
            migrate_tasks_table(conn)
            conn.commit()
            return
        conn.execute(
            "CREATE TABLE IF NOT EXISTS projects("
            "id TEXT PRIMARY KEY, "
            "name TEXT, "
            "owner_id TEXT, "
            "created_at REAL)"
        )
        conn.execute(
            "CREATE TABLE IF NOT EXISTS tasks("
            "id TEXT PRIMARY KEY, "
            "project_id TEXT, "
            "prompt TEXT, "
            "status TEXT, "
            "idempotency_key TEXT, "
            "depends_on TEXT, "
            "priority INTEGER, "
            "created_by TEXT, "
            "created_at REAL, "
            "updated_at REAL, "
            "last_heartbeat REAL, "
            "UNIQUE(project_id, idempotency_key))"
        )
        migrate_tasks_table(conn)
        conn.commit()
    finally:
        conn.close()


@contextmanager
def _auth_store(db_path):
    """每请求一个 AuthStore 实例（自带新连接），用完即关闭。"""
    store = AuthStore(db_path)
    try:
        yield store
    finally:
        try:
            store.conn.close()
        except Exception:
            pass


def _row_get(row, name):
    """sqlite Row 的容错取值：老库行缺列时返回 None 不炸。"""
    try:
        return row[name]
    except (KeyError, IndexError, TypeError):
        return None


def _task_to_dict(row):
    depends_on = row["depends_on"]
    try:
        depends_on = json.loads(depends_on) if depends_on else []
    except (TypeError, ValueError):
        depends_on = []
    if not isinstance(depends_on, list):
        depends_on = [depends_on]
    return {
        "id": row["id"],
        "project_id": row["project_id"],
        "prompt": row["prompt"],
        "status": row["status"],
        "idempotency_key": row["idempotency_key"],
        "depends_on": depends_on,
        "priority": row["priority"],
        "created_by": row["created_by"],
        "created_at": row["created_at"],
        "updated_at": row["updated_at"],
        "last_heartbeat": row["last_heartbeat"],
        "result_text": _row_get(row, "result_text"),
        "error_text": _row_get(row, "error_text"),
        "actual_model": _row_get(row, "actual_model"),
        "started_at": _row_get(row, "started_at"),
        "finished_at": _row_get(row, "finished_at"),
        "child_pid": _row_get(row, "child_pid"),
    }


def _project_to_dict(row):
    return {
        "id": row["id"],
        "name": row["name"],
        "owner_id": row["owner_id"],
        "created_at": row["created_at"],
    }


def sweep_stale_tasks(db_path, threshold_seconds=300):
    """把 running 且心跳过期的任务改为 interrupted，返回被扫任务 id 列表。

    心跳取 last_heartbeat，无心跳则用 updated_at；早于
    now - threshold_seconds 即过期。审计记一条 "sweep_interrupted"
   （user_id 记 "system"，因为回收不是某个用户的操作）。
    独立可单测，不依赖 HTTP。
    """
    now = time.time()
    cutoff = now - threshold_seconds
    conn = _connect(db_path)
    try:
        conn.row_factory = sqlite3.Row
        rows = conn.execute(
            "SELECT id, project_id FROM tasks WHERE status = 'running'"
            " AND COALESCE(last_heartbeat, updated_at) < ?",
            (cutoff,),
        ).fetchall()
        swept = []
        for row in rows:
            cur = conn.execute(
                "UPDATE tasks SET status = 'interrupted', updated_at = ?"
                " WHERE id = ? AND status = 'running'",
                (now, row["id"]),
            )
            if cur.rowcount:
                swept.append(row["id"])
        conn.commit()
        stale = [(row["id"], row["project_id"]) for row in rows
                 if row["id"] in swept]
    finally:
        conn.close()
    with _auth_store(db_path) as store:
        for task_id, project_id in stale:
            store.audit("system", project_id, "sweep_interrupted", task_id)
    return swept


class CloudControlPlaneHandler(BaseHTTPRequestHandler):
    """控制面请求处理：除 /health 与 /webhooks/* 外一律要求 X-API-Key。"""

    protocol_version = "HTTP/1.1"

    # -- 通用工具 ------------------------------------------------------
    def log_message(self, *args):  # 测试输出保持干净
        pass

    def _send_json(self, status, obj):
        body = json.dumps(obj).encode("utf-8")
        self.send_response(status)
        self.send_header("Content-Type", "application/json")
        self.send_header("Content-Length", str(len(body)))
        self.end_headers()
        self.wfile.write(body)

    def _send_html(self, status, html_body):
        body = html_body.encode("utf-8")
        self.send_response(status)
        self.send_header("Content-Type", "text/html; charset=utf-8")
        self.send_header("Content-Length", str(len(body)))
        self.end_headers()
        self.wfile.write(body)

    def _read_body(self):
        try:
            length = int(self.headers.get("Content-Length") or 0)
        except ValueError:
            length = 0
        if length <= 0:
            return b""
        return self.rfile.read(length)

    def _read_json(self):
        """返回 (obj, error)：空 body 视为 {}；非法 JSON 返回 error。"""
        raw = self._read_body()
        if not raw:
            return {}, None
        try:
            obj = json.loads(raw.decode("utf-8"))
        except (ValueError, UnicodeDecodeError):
            return None, "invalid json"
        if not isinstance(obj, dict):
            return None, "body must be a JSON object"
        return obj, None

    def _db(self):
        conn = _connect(self.server.db_path)
        conn.row_factory = sqlite3.Row
        return conn

    def _authenticate(self):
        """X-API-Key -> user_id；无 key 或 key 错返回 None。"""
        api_key = self.headers.get("X-API-Key")
        if not api_key:
            return None
        with _auth_store(self.server.db_path) as store:
            return store.authenticate(api_key)

    # -- 入口 ----------------------------------------------------------
    def do_GET(self):
        self._dispatch("GET")

    def do_POST(self):
        self._dispatch("POST")

    def do_DELETE(self):
        self._dispatch("DELETE")

    def _dispatch(self, method):
        parsed = urlparse(self.path)
        path = parsed.path
        if len(path) > 1 and path.endswith("/"):
            path = path.rstrip("/")
        query = parse_qs(parsed.query)

        if path == "/health" and method == "GET":
            # 健康检查不走限流与认证；db_ok 只做一次轻量查询，
            # 绝不返回连接串、密码或任何凭据。
            db_ok = False
            try:
                conn = _connect(self.server.db_path)
                try:
                    conn.execute("SELECT 1").fetchone()
                    db_ok = True
                finally:
                    conn.close()
            except Exception:
                db_ok = False
            self._send_json(200, {
                "ok": True, "service": "cloud-control-plane",
                "backend": _db_backend_name(), "db_ok": db_ok,
            })
            return
        if path.startswith("/oauth/"):
            # OAuth 登录/回调是 pre-auth 端点（用户还没本站 API key，
            # 这正是 OAuth 要解决的问题），靠 state + client_secret
            # 认证，不走 X-API-Key；不要把它当成无认证后门。
            if method == "GET" and path.endswith("/login"):
                self._oauth_login(path)
            elif method == "GET" and path.endswith("/callback"):
                # 真实浏览器流程：provider 重定向到这里，query 带
                # code + state（不带 client_id，靠 state 记录取回）。
                self._oauth_callback_get(path)
            elif method == "POST" and path.endswith("/callback"):
                self._oauth_callback(path)
            else:
                self._send_json(404, {"error": "not found"})
            return
        if path.startswith("/webhooks/"):
            # webhook 靠签名认证（外部服务无法持 X-API-Key），不走 API key。
            if method != "POST":
                self._send_json(404, {"error": "not found"})
                return
            if path == "/webhooks/github":
                self._handle_github_webhook()
            elif path == "/webhooks/slack":
                self._handle_slack_webhook()
            else:
                self._send_json(404, {"error": "not found"})
            return

        # 限流在认证之前、健康/OAuth/webhook 之后：超限返回 429，
        # 不是 401（不要把“请求太频繁”记成“认证失败”）。
        # key：有 X-API-Key 时按 key 的 sha256 计（原始 key 不存），
        # 无 key 时按客户端 IP 计。
        limiter = getattr(self.server, "rate_limiter", None)
        if limiter is None:
            limiter = RateLimiter(
                per_minute=_rate_limit_from_env(
                    "CLOUD_RATE_LIMIT_PER_MINUTE",
                    DEFAULT_RATE_LIMIT_PER_MINUTE),
                window_seconds=_rate_limit_from_env(
                    "CLOUD_RATE_LIMIT_WINDOW_SECONDS",
                    DEFAULT_RATE_LIMIT_WINDOW_SECONDS))
            self.server.rate_limiter = limiter
        # 测试注入：server.rate_limit_per_minute / rate_limit_window_seconds
        # 改动后即时生效，不用重启 server。
        if getattr(self.server, "rate_limit_per_minute", None) is not None:
            limiter.per_minute = self.server.rate_limit_per_minute
        if getattr(self.server, "rate_limit_window_seconds", None) is not None:
            limiter.window_seconds = self.server.rate_limit_window_seconds
        api_key_header = self.headers.get("X-API-Key")
        if api_key_header:
            limit_key = "key:" + hashlib.sha256(
                api_key_header.encode("utf-8")).hexdigest()
        else:
            limit_key = "ip:" + (self.client_address[0]
                                 if self.client_address else "unknown")
        if not limiter.allow(limit_key):
            self._send_json(429, {"error": "rate_limited"})
            return

        user_id = self._authenticate()
        if user_id is None:
            self._send_json(401, {"error": "unauthorized"})
            return

        if path == "/projects" and method == "POST":
            self._create_project(user_id)
        elif path == "/projects" and method == "GET":
            self._list_projects(user_id)
        elif path == "/metrics" and method == "GET":
            self._metrics(user_id)
        elif path == "/models" and method == "GET":
            self._models_overview(user_id)
        elif path.startswith("/projects/"):
            self._dispatch_project(user_id, method, path, query)
        elif path == "/tasks" and method == "POST":
            self._create_task(user_id)
        elif path == "/tasks" and method == "GET":
            self._list_tasks(user_id, query)
        elif path == "/admin/sweep" and method == "POST":
            self._admin_sweep()
        elif path == "/admin/backup" and method == "POST":
            self._admin_backup(user_id)
        elif path == "/admin/push/dispatch" and method == "POST":
            self._push_dispatch_endpoint(user_id)
        elif path.startswith("/tasks/"):
            rest = path[len("/tasks/"):]
            if "/" not in rest and method == "GET":
                self._get_task(user_id, rest)
            elif rest.endswith("/cost") and method == "GET":
                self._task_cost(user_id, rest[: -len("/cost")])
            elif rest.endswith("/cancel") and method == "POST":
                self._cancel_task(user_id, rest[: -len("/cancel")])
            elif rest.endswith("/merge") and method == "POST":
                self._merge_task(user_id, rest[: -len("/merge")])
            elif rest.endswith("/heartbeat") and method == "POST":
                self._heartbeat_task(user_id, rest[: -len("/heartbeat")])
            else:
                self._send_json(404, {"error": "not found"})
        else:
            self._send_json(404, {"error": "not found"})

    # -- 项目 ----------------------------------------------------------
    def _create_project(self, user_id):
        body, err = self._read_json()
        if err:
            self._send_json(400, {"error": err})
            return
        name = body.get("name")
        if not name or not isinstance(name, str):
            self._send_json(400, {"error": "name required"})
            return
        project_id = body.get("id") or uuid.uuid4().hex
        if not isinstance(project_id, str):
            self._send_json(400, {"error": "id must be a string"})
            return
        now = time.time()
        conn = self._db()
        try:
            existing = conn.execute(
                "SELECT id FROM projects WHERE id = ?", (project_id,)
            ).fetchone()
            if existing:
                self._send_json(409, {"error": "project exists"})
                return
            conn.execute(
                "INSERT INTO projects(id, name, owner_id, created_at)"
                " VALUES(?, ?, ?, ?)",
                (project_id, name, user_id, now),
            )
            conn.commit()
            project = {
                "id": project_id,
                "name": name,
                "owner_id": user_id,
                "created_at": now,
            }
        except (sqlite3.IntegrityError, _PgIntegrityError):
            self._send_json(409, {"error": "project exists"})
            return
        finally:
            conn.close()
        # AuthStore.create_project 只写成员表（owner 角色），项目记录
        # 本身在上面的 projects 表；两者配合才算一个完整项目。
        with _auth_store(self.server.db_path) as store:
            store.create_project(project_id, user_id)
            store.audit(user_id, project_id, "create_project", name)
        self._send_json(201, project)

    def _list_projects(self, user_id):
        conn = self._db()
        try:
            member_ids = {
                row["project_id"]
                for row in conn.execute(
                    "SELECT project_id FROM project_members WHERE user_id = ?",
                    (user_id,),
                ).fetchall()
            }
            rows = conn.execute(
                "SELECT id, name, owner_id, created_at FROM projects"
                " ORDER BY created_at, id"
            ).fetchall()
        finally:
            conn.close()
        projects = [_project_to_dict(r) for r in rows
                    if r["id"] in member_ids]
        self._send_json(200, {"projects": projects})

    # -- 项目子资源：记忆 / 知识库 / 成本 -------------------------------
    def _project_exists(self, project_id):
        conn = self._db()
        try:
            row = conn.execute(
                "SELECT id FROM projects WHERE id = ?", (project_id,)
            ).fetchone()
            return row is not None
        finally:
            conn.close()

    def _check_project(self, user_id, project_id, action):
        """返回 None 表示通过；否则返回 (status, error) 先行响应。"""
        if not self._project_exists(project_id):
            return 404, "project not found"
        with _auth_store(self.server.db_path) as store:
            if not store.check_permission(user_id, project_id, action):
                return 403, "forbidden"
        return None

    def _dispatch_project(self, user_id, method, path, query):
        rest = path[len("/projects/"):]
        parts = rest.split("/")
        project_id = parts[0] if parts else ""
        if not project_id:
            self._send_json(404, {"error": "not found"})
            return
        # /projects/{id}/memory
        if len(parts) == 2 and parts[1] == "memory":
            if method == "POST":
                err = self._check_project(user_id, project_id, "create_task")
                if err:
                    self._send_json(err[0], {"error": err[1]})
                    return
                self._memory_create(user_id, project_id)
            elif method == "GET":
                err = self._check_project(user_id, project_id, "read")
                if err:
                    self._send_json(err[0], {"error": err[1]})
                    return
                self._memory_list(project_id, query)
            else:
                self._send_json(404, {"error": "not found"})
            return
        # /projects/{id}/memory/{mid}/supersede
        if len(parts) == 4 and parts[1] == "memory" and parts[3] == "supersede":
            if method != "POST":
                self._send_json(404, {"error": "not found"})
                return
            err = self._check_project(user_id, project_id, "create_task")
            if err:
                self._send_json(err[0], {"error": err[1]})
                return
            self._memory_supersede(user_id, project_id, parts[2])
            return
        # /projects/{id}/kb/index
        if len(parts) == 3 and parts[1] == "kb" and parts[2] == "index":
            if method != "POST":
                self._send_json(404, {"error": "not found"})
                return
            err = self._check_project(user_id, project_id, "create_task")
            if err:
                self._send_json(err[0], {"error": err[1]})
                return
            self._kb_index(user_id, project_id)
            return
        # /projects/{id}/kb/search
        if len(parts) == 3 and parts[1] == "kb" and parts[2] == "search":
            if method != "GET":
                self._send_json(404, {"error": "not found"})
                return
            err = self._check_project(user_id, project_id, "read")
            if err:
                self._send_json(err[0], {"error": err[1]})
                return
            self._kb_search(project_id, query)
            return
        # /projects/{id}/cost
        if len(parts) == 2 and parts[1] == "cost":
            if method != "GET":
                self._send_json(404, {"error": "not found"})
                return
            err = self._check_project(user_id, project_id, "read")
            if err:
                self._send_json(err[0], {"error": err[1]})
                return
            self._project_cost(project_id, query)
            return
        # /projects/{id}/push/subscriptions
        if len(parts) == 3 and parts[1] == "push" and parts[2] == "subscriptions":
            if method == "POST":
                err = self._check_project(user_id, project_id, "create_task")
                if err:
                    self._send_json(err[0], {"error": err[1]})
                    return
                self._push_create_endpoint(user_id, project_id)
            elif method == "GET":
                err = self._check_project(user_id, project_id, "read")
                if err:
                    self._send_json(err[0], {"error": err[1]})
                    return
                self._send_json(200, {
                    "subscriptions": _push_list(
                        self.server.db_path, project_id, user_id=user_id)})
            else:
                self._send_json(404, {"error": "not found"})
            return
        # /projects/{id}/push/subscriptions/{sid}  DELETE
        if len(parts) == 4 and parts[1] == "push" and parts[2] == "subscriptions":
            if method != "DELETE":
                self._send_json(404, {"error": "not found"})
                return
            err = self._check_project(user_id, project_id, "create_task")
            if err:
                self._send_json(err[0], {"error": err[1]})
                return
            subs = _push_list(self.server.db_path, project_id)
            mine = [s for s in subs if s["id"] == parts[3]]
            if not mine:
                self._send_json(404, {"error": "subscription not found"})
                return
            # 只能删自己的订阅，项目 owner 可删任意（owner 角色检查）。
            with _auth_store(self.server.db_path) as auth:
                is_owner = auth.check_permission(
                    user_id, project_id, "manage_project")
            if mine[0]["user_id"] != user_id and not is_owner:
                self._send_json(403, {"error": "forbidden"})
                return
            deleted = _push_delete(self.server.db_path,
                                   subscription_id=parts[3])
            self._send_json(200, {"deleted": bool(deleted)})
            return
        self._send_json(404, {"error": "not found"})

    def _memory_create(self, user_id, project_id):
        body, err = self._read_json()
        if err:
            self._send_json(400, {"error": err})
            return
        goal = body.get("goal")
        conclusion = body.get("conclusion")
        if not goal or not isinstance(goal, str):
            self._send_json(400, {"error": "goal required"})
            return
        if not conclusion or not isinstance(conclusion, str):
            self._send_json(400, {"error": "conclusion required"})
            return
        store = MemoryStore(self.server.db_path)
        try:
            mid = store.add_summary(
                project_id,
                body.get("thread_id") or "",
                goal,
                conclusion,
                files_changed=body.get("files_changed") or [],
                open_issues=body.get("open_issues") or [],
            )
        finally:
            try:
                store.conn.close()
            except Exception:
                pass
        with _auth_store(self.server.db_path) as auth:
            auth.audit(user_id, project_id, "create_memory", str(mid))
        self._send_json(201, {"id": mid, "project_id": project_id})

    def _memory_list(self, project_id, query):
        try:
            top_k = int((query.get("top_k") or ["5"])[0])
        except (TypeError, ValueError):
            self._send_json(400, {"error": "top_k must be an integer"})
            return
        store = MemoryStore(self.server.db_path)
        try:
            summaries = store.list_summaries(project_id)
            context = store.build_prompt_context(project_id, top_k=top_k)
        finally:
            try:
                store.conn.close()
            except Exception:
                pass
        self._send_json(200, {
            "project_id": project_id,
            "summaries": summaries[:top_k],
            "prompt_context": context,
        })

    def _memory_supersede(self, user_id, project_id, mid_raw):
        try:
            mid = int(mid_raw)
        except (TypeError, ValueError):
            self._send_json(400, {"error": "id must be an integer"})
            return
        conn = self._db()
        try:
            row = conn.execute(
                "SELECT project_id FROM summaries WHERE id = ?", (mid,)
            ).fetchone()
        finally:
            conn.close()
        if row is None or row["project_id"] != project_id:
            self._send_json(404, {"error": "summary not found"})
            return
        store = MemoryStore(self.server.db_path)
        try:
            store.deprecate(mid)
        finally:
            try:
                store.conn.close()
            except Exception:
                pass
        with _auth_store(self.server.db_path) as auth:
            auth.audit(user_id, project_id, "supersede_memory", str(mid))
        self._send_json(200, {"id": mid, "status": "deprecated"})

    def _kb_index(self, user_id, project_id):
        body, err = self._read_json()
        if err:
            self._send_json(400, {"error": err})
            return
        path = body.get("path")
        content = body.get("content")
        if not path or not isinstance(path, str):
            self._send_json(400, {"error": "path required"})
            return
        if content is None or not isinstance(content, str):
            self._send_json(400, {"error": "content required"})
            return
        store = KBStore(self.server.db_path)
        try:
            doc_id = store.index_file(
                project_id, path, content,
                kind=body.get("kind") or "file")
        except ValueError as e:
            self._send_json(400, {"error": str(e)})
            return
        finally:
            try:
                store.conn.close()
            except Exception:
                pass
        with _auth_store(self.server.db_path) as auth:
            auth.audit(user_id, project_id, "kb_index", path)
        self._send_json(201, {"id": doc_id, "project_id": project_id,
                              "path": path})

    def _kb_search(self, project_id, query):
        q = (query.get("q") or [""])[0]
        if not q:
            self._send_json(400, {"error": "q required"})
            return
        try:
            top_k = int((query.get("top_k") or ["5"])[0])
        except (TypeError, ValueError):
            self._send_json(400, {"error": "top_k must be an integer"})
            return
        store = KBStore(self.server.db_path)
        try:
            results = store.search(project_id, q, top_k=top_k)
        finally:
            try:
                store.conn.close()
            except Exception:
                pass
        self._send_json(200, {"project_id": project_id, "query": q,
                              "results": results})

    def _project_cost(self, project_id, query):
        store = CostStore(self.server.db_path)
        try:
            overall = store.report_by_project(project_id)
            conn = store._conn
            conn.row_factory = sqlite3.Row
            days = (query.get("days") or [None])[0]
            day = (query.get("day") or [None])[0]
            daily = []
            if day:
                row = conn.execute(
                    "SELECT day, COALESCE(SUM(total_tokens),0) AS t,"
                    " COALESCE(SUM(usd_micros),0) AS u, COUNT(*) AS c,"
                    " COALESCE(SUM(fallback_count),0) AS f"
                    " FROM cost_records WHERE project_id = ? AND day = ?"
                    " GROUP BY day",
                    (project_id, day)).fetchone()
                if row:
                    daily = [{"day": row["day"], "total_tokens": row["t"],
                              "usd_micros": row["u"], "turns": row["c"],
                              "fallback_count": row["f"]}]
            elif days is not None:
                try:
                    n = int(days)
                except (TypeError, ValueError):
                    self._send_json(400, {"error": "days must be an integer"})
                    return
                from datetime import date, timedelta
                cutoff = (date.today() - timedelta(days=max(n - 1, 0))
                          ).isoformat()
                rows = conn.execute(
                    "SELECT day, COALESCE(SUM(total_tokens),0) AS t,"
                    " COALESCE(SUM(usd_micros),0) AS u, COUNT(*) AS c,"
                    " COALESCE(SUM(fallback_count),0) AS f"
                    " FROM cost_records WHERE project_id = ? AND day >= ?"
                    " GROUP BY day ORDER BY day",
                    (project_id, cutoff)).fetchall()
                daily = [{"day": r["day"], "total_tokens": r["t"],
                          "usd_micros": r["u"], "turns": r["c"],
                          "fallback_count": r["f"]} for r in rows]
        finally:
            try:
                store._conn.close()
            except Exception:
                pass
        self._send_json(200, {"project_id": project_id, "overall": overall,
                              "daily": daily})

    # -- 任务成本与模型总览 ----------------------------------------------
    def _task_cost(self, user_id, task_id):
        row = self._fetch_task(task_id)
        if row is None:
            self._send_json(404, {"error": "task not found"})
            return
        task = _task_to_dict(row)
        with _auth_store(self.server.db_path) as auth:
            if not auth.check_permission(user_id, task["project_id"], "read"):
                self._send_json(403, {"error": "forbidden"})
                return
        store = CostStore(self.server.db_path)
        try:
            report = store.report_by_task(task_id)
        finally:
            try:
                store._conn.close()
            except Exception:
                pass
        self._send_json(200, {"task_id": task_id,
                              "project_id": task["project_id"], **report})

    def _models_overview(self, user_id):
        # 优先级列表来自环境变量 MODELS_PRIORITY（逗号分隔），未设时
        # 用默认列表；这只是控制面的默认配置，不是 provider 的承诺。
        raw = os.environ.get("MODELS_PRIORITY", "")
        priority = [m.strip() for m in raw.split(",") if m.strip()] or [
            "gpt-6.1-sol", "gpt-6-sol", "gpt-5.6-sol"]
        # 只统计调用者是成员的项目，避免跨项目泄露成本。
        conn = self._db()
        try:
            member_ids = [r["project_id"] for r in conn.execute(
                "SELECT project_id FROM project_members WHERE user_id = ?",
                (user_id,)).fetchall()]
        finally:
            conn.close()
        if not member_ids:
            self._send_json(200, {"priority_list": priority,
                                  "model_stats": [], "fallback_events": []})
            return
        placeholders = ",".join("?" for _ in member_ids)
        store = CostStore(self.server.db_path)
        try:
            conn = store._conn
            conn.row_factory = sqlite3.Row
            rows = conn.execute(
                "SELECT model, COUNT(*) AS turns,"
                " COALESCE(SUM(total_tokens),0) AS tokens,"
                " COALESCE(SUM(fallback_count),0) AS fallbacks"
                " FROM cost_records WHERE project_id IN (%s)"
                " GROUP BY model ORDER BY model" % placeholders,
                member_ids).fetchall()
            fb_rows = conn.execute(
                "SELECT task_id, project_id, model, fallback_count"
                " FROM cost_records WHERE project_id IN (%s)"
                " AND fallback_count > 0"
                " ORDER BY created_at DESC LIMIT 50" % placeholders,
                member_ids).fetchall()
        finally:
            try:
                store._conn.close()
            except Exception:
                pass
        self._send_json(200, {
            "priority_list": priority,
            "model_stats": [
                {"model": r["model"], "turns": r["turns"],
                 "total_tokens": r["tokens"],
                 "fallback_count": r["fallbacks"]} for r in rows],
            "fallback_events": [
                {"task_id": r["task_id"], "project_id": r["project_id"],
                 "model": r["model"],
                 "fallback_count": r["fallback_count"]} for r in fb_rows],
        })

    # -- 任务 ----------------------------------------------------------
    def _create_task(self, user_id):
        body, err = self._read_json()
        if err:
            self._send_json(400, {"error": err})
            return
        project_id = body.get("project_id")
        prompt = body.get("prompt")
        if not project_id or not isinstance(project_id, str):
            self._send_json(400, {"error": "project_id required"})
            return
        if not prompt or not isinstance(prompt, str):
            self._send_json(400, {"error": "prompt required"})
            return
        depends_on = body.get("depends_on") or []
        if isinstance(depends_on, str):
            depends_on = [depends_on]
        if not isinstance(depends_on, list):
            self._send_json(400, {"error": "depends_on must be a list"})
            return
        try:
            priority = int(body.get("priority", 0) or 0)
        except (TypeError, ValueError):
            self._send_json(400, {"error": "priority must be an integer"})
            return
        idempotency_key = body.get("idempotency_key")
        if idempotency_key is not None and not isinstance(idempotency_key, str):
            self._send_json(400, {"error": "idempotency_key must be a string"})
            return
        with _auth_store(self.server.db_path) as store:
            if not store.check_permission(user_id, project_id, "create_task"):
                self._send_json(403, {"error": "forbidden"})
                return
        now = time.time()
        conn = self._db()
        try:
            if idempotency_key is not None:
                row = conn.execute(
                    "SELECT * FROM tasks WHERE project_id = ?"
                    " AND idempotency_key = ?",
                    (project_id, idempotency_key),
                ).fetchone()
                if row:
                    self._send_json(200, _task_to_dict(row))
                    return
            task_id = uuid.uuid4().hex
            try:
                conn.execute(
                    "INSERT INTO tasks(id, project_id, prompt, status,"
                    " idempotency_key, depends_on, priority, created_by,"
                    " created_at, updated_at, last_heartbeat)"
                    " VALUES(?, ?, ?, 'queued', ?, ?, ?, ?, ?, ?, NULL)",
                    (task_id, project_id, prompt, idempotency_key,
                     json.dumps(depends_on), priority, user_id, now, now),
                )
                conn.commit()
            except (sqlite3.IntegrityError, _PgIntegrityError):
                # 并发下同幂等键抢建：回读已有任务，不建重复。
                row = conn.execute(
                    "SELECT * FROM tasks WHERE project_id = ?"
                    " AND idempotency_key = ?",
                    (project_id, idempotency_key),
                ).fetchone()
                if row:
                    self._send_json(200, _task_to_dict(row))
                    return
                raise
            row = conn.execute(
                "SELECT * FROM tasks WHERE id = ?", (task_id,)
            ).fetchone()
            task = _task_to_dict(row)
        finally:
            conn.close()
        with _auth_store(self.server.db_path) as store:
            store.audit(user_id, project_id, "create_task", task_id)
        self._send_json(201, task)

    def _list_tasks(self, user_id, query):
        project_ids = query.get("project_id")
        project_id = project_ids[0] if project_ids else None
        if not project_id:
            self._send_json(400, {"error": "project_id required"})
            return
        with _auth_store(self.server.db_path) as store:
            if not store.check_permission(user_id, project_id, "read"):
                self._send_json(403, {"error": "forbidden"})
                return
        conn = self._db()
        try:
            rows = conn.execute(
                "SELECT * FROM tasks WHERE project_id = ?"
                " ORDER BY created_at, id",
                (project_id,),
            ).fetchall()
        finally:
            conn.close()
        self._send_json(200, {"tasks": [_task_to_dict(r) for r in rows]})

    def _fetch_task(self, task_id):
        conn = self._db()
        try:
            return conn.execute(
                "SELECT * FROM tasks WHERE id = ?", (task_id,)
            ).fetchone()
        finally:
            conn.close()

    def _get_task(self, user_id, task_id):
        row = self._fetch_task(task_id)
        if row is None:
            self._send_json(404, {"error": "task not found"})
            return
        task = _task_to_dict(row)
        with _auth_store(self.server.db_path) as store:
            if not store.check_permission(user_id, task["project_id"], "read"):
                self._send_json(403, {"error": "forbidden"})
                return
        self._send_json(200, task)

    def _cancel_task(self, user_id, task_id):
        row = self._fetch_task(task_id)
        if row is None:
            self._send_json(404, {"error": "task not found"})
            return
        task = _task_to_dict(row)
        with _auth_store(self.server.db_path) as store:
            if not store.check_permission(
                    user_id, task["project_id"], "create_task"):
                self._send_json(403, {"error": "forbidden"})
                return
        if task["status"] in TERMINAL_STATUSES:
            self._send_json(400, {"error": "task already terminal"})
            return
        now = time.time()
        conn = self._db()
        try:
            conn.execute(
                "UPDATE tasks SET status = 'interrupted', updated_at = ?"
                " WHERE id = ?",
                (now, task_id),
            )
            conn.commit()
            task = _task_to_dict(
                conn.execute(
                    "SELECT * FROM tasks WHERE id = ?", (task_id,)
                ).fetchone()
            )
        finally:
            conn.close()
        with _auth_store(self.server.db_path) as store:
            store.audit(user_id, task["project_id"], "cancel_task", task_id)
        self._send_json(200, task)

    def _merge_task(self, user_id, task_id):
        """把云端任务标记为已合并：只补状态，不执行合并本身。

        合并本身仍由 host.py merge（本地或 Docker 容器内）执行，
        成功后再调本接口同步云端状态——两者分离是故意的：合并
        是要人看 diff 才点的操作，云端不该在任务 completed 时
        自动把主分支改了。规则：任务必须存在（404）、调用方
        必须是项目 maintainer 以上（approve_merge，403）、任务
        必须是 completed（其它状态一律 409，含已 merged 的重复
        调用，避免二次合并混淆）。成功后写审计 merge_task。
        """
        row = self._fetch_task(task_id)
        if row is None:
            self._send_json(404, {"error": "task not found"})
            return
        task = _task_to_dict(row)
        with _auth_store(self.server.db_path) as store:
            if not store.check_permission(
                    user_id, task["project_id"], "approve_merge"):
                self._send_json(403, {"error": "forbidden"})
                return
        if task["status"] != "completed":
            self._send_json(409, {
                "error": "only completed tasks can be marked merged",
                "status": task["status"],
            })
            return
        now = time.time()
        conn = self._db()
        try:
            conn.execute(
                "UPDATE tasks SET status = 'merged', updated_at = ?"
                " WHERE id = ?",
                (now, task_id),
            )
            conn.commit()
            task = _task_to_dict(
                conn.execute(
                    "SELECT * FROM tasks WHERE id = ?", (task_id,)
                ).fetchone()
            )
        finally:
            conn.close()
        with _auth_store(self.server.db_path) as store:
            store.audit(user_id, task["project_id"], "merge_task", task_id)
        self._send_json(200, task)

    def _heartbeat_task(self, user_id, task_id):
        row = self._fetch_task(task_id)
        if row is None:
            self._send_json(404, {"error": "task not found"})
            return
        task = _task_to_dict(row)
        with _auth_store(self.server.db_path) as store:
            if not store.check_permission(
                    user_id, task["project_id"], "create_task"):
                self._send_json(403, {"error": "forbidden"})
                return
        now = time.time()
        new_status = "running" if task["status"] == "queued" else task["status"]
        conn = self._db()
        try:
            conn.execute(
                "UPDATE tasks SET status = ?, last_heartbeat = ?,"
                " updated_at = ? WHERE id = ?",
                (new_status, now, now, task_id),
            )
            conn.commit()
            task = _task_to_dict(
                conn.execute(
                    "SELECT * FROM tasks WHERE id = ?", (task_id,)
                ).fetchone()
            )
        finally:
            conn.close()
        self._send_json(200, task)

    # -- 管理 ----------------------------------------------------------
    def _admin_sweep(self):
        body, err = self._read_json()
        if err:
            self._send_json(400, {"error": err})
            return
        threshold = body.get(
            "threshold_seconds", DEFAULT_SWEEP_THRESHOLD_SECONDS)
        try:
            threshold = int(threshold)
        except (TypeError, ValueError):
            self._send_json(400, {"error": "threshold_seconds must be an integer"})
            return
        swept = sweep_stale_tasks(self.server.db_path, threshold)
        self._send_json(200, {"swept": swept})

    def _admin_backup(self, user_id):
        """POST /admin/backup：备份当前后端数据库，返回路径与规模信息。

        权限：调用方须在至少一个项目里是 maintainer 以上（全局
        管理端点没有单个项目上下文，按“任一项目 maintainer+”
        判定；无此角色返回 403）。返回只含 backend、备份文件
        路径、文件大小与任务行数，绝不返回数据库密码、备份文件
        内容或任何凭据。out_dir 可由 body 指定，否则走环境变量
        CLOUD_BACKUP_DIR，未设则用 cloud-backups。
        """
        body, err = self._read_json()
        if err:
            self._send_json(400, {"error": err})
            return
        conn = self._db()
        try:
            member_rows = conn.execute(
                "SELECT role FROM project_members WHERE user_id = ?",
                (user_id,),
            ).fetchall()
        finally:
            conn.close()
        role_levels = {"viewer": 0, "contributor": 1,
                       "maintainer": 2, "owner": 3}
        is_maintainer = any(
            role_levels.get(row[0], 0) >= 2 for row in member_rows)
        if not is_maintainer:
            self._send_json(403, {"error": "forbidden"})
            return
        out_dir = body.get("out_dir") or os.environ.get(
            "CLOUD_BACKUP_DIR") or "cloud-backups"
        if not isinstance(out_dir, str) or not out_dir:
            self._send_json(400, {"error": "out_dir must be a string"})
            return
        backend = _db_backend_name()
        try:
            if backend == "postgres":
                from cloud.backup import backup_postgres as _backup_pg
                dest = _backup_pg(out_dir, keep=3)
            else:
                from cloud.backup import backup_db as _backup_sqlite
                dest = _backup_sqlite(self.server.db_path, out_dir, keep=3)
            size_bytes = os.path.getsize(dest)
            conn = self._db()
            try:
                task_count = conn.execute(
                    "SELECT COUNT(*) FROM tasks").fetchone()[0]
            finally:
                conn.close()
        except Exception as exc:
            self._send_json(500, {"error": "backup failed: %s" % (exc,)})
            return
        self._send_json(200, {
            "backend": backend, "path": dest,
            "size_bytes": size_bytes, "task_count": task_count,
        })

    def _metrics(self, user_id):
        """可观测性：任务计数、成功率、平均耗时、fallback、成本合计。

        权限：任意项目成员即可读（不要求 owner），但只统计调用者
        是成员的项目——不是全库数字，避免跨项目信息泄露。
        成本真数与估算分开：cost_records 的 source 列区分。
        """
        conn = self._db()
        try:
            member_ids = {
                row["project_id"]
                for row in conn.execute(
                    "SELECT project_id FROM project_members WHERE user_id = ?",
                    (user_id,),
                ).fetchall()
            }
            rows = conn.execute(
                "SELECT project_id, status, started_at, finished_at"
                " FROM tasks"
            ).fetchall()
            # 按状态分计数：七个状态键恒存在（缺失为 0），调用方
            # 不用再猜某个状态是“零”还是“没统计”。
            by_status = {key: 0 for key in TASK_STATUS_KEYS}
            durations = []
            for row in rows:
                if row["project_id"] not in member_ids:
                    continue
                by_status[row["status"]] = by_status.get(row["status"], 0) + 1
                if row["started_at"] and row["finished_at"]:
                    durations.append(row["finished_at"] - row["started_at"])
            total = sum(by_status.values())
            done = by_status.get("completed", 0) + by_status.get("merged", 0)
            failed = by_status.get("failed", 0) + by_status.get("merge-failed", 0)
            finished = done + failed
            try:
                cost_rows = conn.execute(
                    "SELECT project_id, source, total_tokens, usd_micros,"
                    " fallback_count FROM cost_records"
                ).fetchall()
            except (sqlite3.OperationalError, _PgOperationalError):
                cost_rows = []
            actual_tokens = estimated_tokens = 0
            actual_usd = estimated_usd = 0
            fallback_total = 0
            for row in cost_rows:
                if row["project_id"] not in member_ids:
                    continue
                if row["source"] == "actual":
                    actual_tokens += row["total_tokens"] or 0
                    actual_usd += row["usd_micros"] or 0
                else:
                    estimated_tokens += row["total_tokens"] or 0
                    estimated_usd += row["usd_micros"] or 0
                fallback_total += row["fallback_count"] or 0
        finally:
            conn.close()
        self._send_json(200, {
            "total_tasks": total,
            "by_status": by_status,
            "success_rate": (done / finished) if finished else None,
            "avg_duration_seconds": (
                sum(durations) / len(durations)) if durations else None,
            "fallback_total": fallback_total,
            "cost": {
                "actual_tokens": actual_tokens,
                "estimated_tokens": estimated_tokens,
                "actual_usd_micros": actual_usd,
                "estimated_usd_micros": estimated_usd,
            },
        })

    # -- OAuth（pre-auth，靠 state + secret，不走 X-API-Key）-----------
    def _oauth_provider(self, path):
        parts = [p for p in path.split("/") if p]
        if len(parts) != 3 or parts[0] != "oauth":
            return None
        return parts[1]

    def _oauth_login(self, path):
        provider = self._oauth_provider(path)
        if provider is None:
            self._send_json(404, {"error": "not found"})
            return
        query = parse_qs(urlparse(self.path).query)
        client_id = (query.get("client_id") or [None])[0]
        redirect_uri = (query.get("redirect_uri") or [None])[0]
        scope = (query.get("scope") or [None])[0]
        if not client_id or not redirect_uri:
            self._send_json(400, {"error": "client_id and redirect_uri required"})
            return
        store = OAuthStateStore(self.server.db_path)
        try:
            state, url = start_oauth_login(
                store, provider, client_id, redirect_uri, scope=scope)
        except OAuthError as e:
            self._send_json(400, {"error": str(e), "reason": e.reason})
            return
        except ValueError as e:
            self._send_json(400, {"error": str(e)})
            return
        finally:
            try:
                store.conn.close()
            except Exception:
                pass
        # 只返回 URL，不直接跳转到任何登录页；跳转由调用方决定。
        self._send_json(200, {"provider": provider, "state": state,
                              "authorization_url": url})

    def _oauth_clients(self, provider):
        """回调用的 http/userinfo 客户端：测试注入优先，生产走真实路径。

        server 属性 oauth_http_client / oauth_userinfo_client 由
        create_server 置为 None（生产）或由测试注入 fake；http_client
        已注入（fake）而 userinfo 未注入时不走真实 userinfo（fake
        token 自带身份字段时不需要它，走真实端点反而会用假 token
        撞真实 GitHub）。生产（两者都未注入）时 userinfo 走真实端点。
        """
        http_client = getattr(self.server, "oauth_http_client", None)
        userinfo_client = getattr(self.server, "oauth_userinfo_client", None)
        if userinfo_client is None and http_client is None:
            userinfo_client = default_userinfo_client(provider)
        return http_client, userinfo_client

    def _oauth_finish(self, provider, code, state, client_id, redirect_uri):
        """回调共用后半段：验 state -> 换 token -> 取身份 -> 发本站 key。

        成功返回 (local_id, created, api_key_plain, rotated, identity)；
        失败抛 OAuthError（调用方按 JSON/HTML 分别呈现，绝不把
        access_token、client_secret、旧 API key 写进任何响应）。
        client_id / redirect_uri 为 None 时由 handle_oauth_callback
        从 state 记录取回（真实浏览器回调只带 code + state）。
        """
        store = OAuthStateStore(self.server.db_path)
        try:
            http_client, userinfo_client = self._oauth_clients(provider)
            identity = handle_oauth_callback(
                store, provider, code, state, client_id, redirect_uri,
                http_client=http_client, userinfo_client=userinfo_client)
        finally:
            try:
                store.conn.close()
            except Exception:
                pass
        with _auth_store(self.server.db_path) as auth:
            local_id, created, api_key_plain, rotated = \
                map_external_identity_to_local_user_with_key(
                    auth, provider, identity)
            auth.audit(local_id, "", "oauth_login",
                       "%s:%s" % (provider, identity.get("external_id")))
            if rotated:
                auth.audit(local_id, "", "api_key_rotated", provider)
        return local_id, created, api_key_plain, rotated, identity

    def _oauth_callback(self, path):
        provider = self._oauth_provider(path)
        if provider is None:
            self._send_json(404, {"error": "not found"})
            return
        body, err = self._read_json()
        if err:
            self._send_json(400, {"error": err})
            return
        code = body.get("code")
        state = body.get("state")
        client_id = body.get("client_id")
        redirect_uri = body.get("redirect_uri")
        if not code or not state:
            self._send_json(400, {"error": "code and state required"})
            return
        try:
            local_id, created, api_key_plain, rotated, identity = \
                self._oauth_finish(provider, code, state, client_id,
                                   redirect_uri)
        except OAuthError as e:
            self._send_json(400, {"error": str(e), "reason": e.reason})
            return
        # api_key 明文只在这里出现一次：调用方须立即保存，
        # 之后任何接口都不再返回它；轮换时旧 key 已失效。
        self._send_json(200, {"user_id": local_id, "created": created,
                              "provider": provider,
                              "login": identity.get("login"),
                              "email": identity.get("email"),
                              "api_key": api_key_plain,
                              "api_key_rotated": rotated})

    def _oauth_error_page(self, reason, message):
        """GET 回调的 400 错误页：只含 reason 与提示，不含任何密钥、
        token 或旧 API key（message 来自 OAuthError，本身不含密钥，
        仍做 HTML 转义）。"""
        return (
            "<!doctype html><html><head><meta charset='utf-8'>"
            "<title>OAuth login failed</title></head><body>"
            "<h1>OAuth login failed</h1>"
            "<p>reason: %s</p><p>%s</p>"
            "<p>Please restart login from the login page.</p>"
            "</body></html>"
            % (html.escape(str(reason or "error")),
               html.escape(str(message))))

    def _oauth_success_page(self, provider, local_id, created, login,
                            api_key_plain, rotated):
        """GET 回调的成功页：只显示 login、user_id、created 与新 API key
        一次；绝不显示 access_token、client_secret、旧 API key。"""
        rotation_note = (
            "<p>Your previous API key has been rotated and no longer works.</p>"
            if rotated else "")
        return (
            "<!doctype html><html><head><meta charset='utf-8'>"
            "<title>OAuth login succeeded</title></head><body>"
            "<h1>OAuth login succeeded</h1>"
            "<p>provider: %s</p>"
            "<p>login: %s</p>"
            "<p>user_id: %s</p>"
            "<p>new user: %s</p>"
            "%s"
            "<p>Your API key (shown only once, save it now):</p>"
            "<p><code>%s</code></p>"
            "<p>Please save it immediately. It will not be shown again "
            "after you leave or refresh this page."
            "%s</p>"
            "<p>Use it as the X-API-Key header for API calls.</p>"
            "</body></html>"
            % (html.escape(str(provider)),
               html.escape(str(login)),
               html.escape(str(local_id)),
               "yes" if created else "no",
               rotation_note,
               html.escape(str(api_key_plain)),
               " Your old key has expired (rotated)." if rotated else ""))

    def _oauth_callback_get(self, path):
        provider = self._oauth_provider(path)
        if provider is None:
            self._send_html(404, self._oauth_error_page(
                "not_found", "unknown oauth path"))
            return
        query = parse_qs(urlparse(self.path).query)
        code = (query.get("code") or [None])[0]
        state = (query.get("state") or [None])[0]
        client_id = (query.get("client_id") or [None])[0]
        redirect_uri = (query.get("redirect_uri") or [None])[0]
        if not code or not state:
            self._send_html(400, self._oauth_error_page(
                "missing_params", "code and state required"))
            return
        try:
            local_id, created, api_key_plain, rotated, identity = \
                self._oauth_finish(provider, code, state, client_id,
                                   redirect_uri)
        except OAuthError as e:
            self._send_html(400, self._oauth_error_page(
                e.reason or "oauth_failed", str(e)))
            return
        self._send_html(200, self._oauth_success_page(
            provider, local_id, created, identity.get("login"),
            api_key_plain, rotated))

    # -- 推送订阅与分发 ---------------------------------------------------
    def _push_create_endpoint(self, user_id, project_id):
        body, err = self._read_json()
        if err:
            self._send_json(400, {"error": err})
            return
        try:
            sub = _push_create(
                self.server.db_path, project_id, user_id,
                body.get("channel"), body.get("target"),
                body.get("preference") or "instant")
        except ValueError as e:
            self._send_json(400, {"error": str(e)})
            return
        self._send_json(201, sub)

    def _push_dispatch_endpoint(self, user_id):
        body, err = self._read_json()
        if err:
            self._send_json(400, {"error": err})
            return
        event_type = body.get("event_type")
        project_id = body.get("project_id")
        if not event_type or not project_id:
            self._send_json(400, {"error": "event_type and project_id required"})
            return
        # 分发者须是该项目的成员（至少可读），否则不能往别人项目里推。
        with _auth_store(self.server.db_path) as auth:
            if not auth.check_permission(user_id, project_id, "read"):
                self._send_json(403, {"error": "forbidden"})
                return
        # HTTP 层无可注入 sender：webhook/slack 会报“无 sender”，
        # webpush/apns/fcm 会报缺凭证——都不静默成功。真实发送端
        # 由 worker 注入 sender 后调 push.dispatch_event。
        result = _push_dispatch(
            self.server.db_path, event_type, project_id,
            body.get("payload") or {}, sender=None)
        self._send_json(200, result)

    # -- webhooks（签名认证，不走 X-API-Key）---------------------------
    def _handle_github_webhook(self):
        """GitHub webhook：验签 -> delivery 去重 -> 解析 -> 执行建任务。

        顺序是故意的：secret 未配 503、签名无效 401（两者都在
        去重之前，避免未验签的重复送达污染去重表）；同一
        X-GitHub-Delivery 第二次送达直接回 200 duplicate，不
        重复建任务、不重复记审计。/fix-review 解析成功后在
        控制面建一个 queued 任务（prompt 含 repo、PR 号、评论
        原文、作者），由 worker 认领执行——webhook 本身不跑模型。
        任务归属：按项目名 == repo full_name 匹配项目；没有匹配
        项目时不凭空建项目、不建任务，返回 task_id 为 None 并
        说明原因（worker 的 repo 仍是配置里的 repo，不是任意
        GitHub 仓库的自动克隆，见 README）。check_run /
        check_suite 只做通知解析，返回解析结果而不建任务、不改
        云端任务状态（CI 状态回填由 pr-checks 主动拉取）。
        """
        raw = self._read_body()
        secret = os.environ.get("GITHUB_WEBHOOK_SECRET")
        if not secret:
            self._send_json(503, {"error": "github webhook secret not configured"})
            return
        signature = self.headers.get("X-Hub-Signature-256")
        if not verify_github_signature(secret, raw, signature):
            self._send_json(401, {"error": "unauthorized"})
            return
        try:
            payload = json.loads(raw.decode("utf-8")) if raw else {}
        except (ValueError, UnicodeDecodeError):
            self._send_json(400, {"error": "invalid json"})
            return
        if not isinstance(payload, dict):
            self._send_json(400, {"error": "body must be a JSON object"})
            return
        event = self.headers.get("X-GitHub-Event")
        delivery_id = self.headers.get("X-GitHub-Delivery")
        repository = payload.get("repository") or {}
        repo_name = repository.get("full_name")
        store = WebhookDeliveryStore(self.server.db_path)
        try:
            if not store.claim(delivery_id, event=event, repo=repo_name):
                self._send_json(200, {
                    "duplicate": True, "delivery_id": delivery_id,
                })
                return
        finally:
            try:
                store.close()
            except Exception:
                pass
        # check_run / check_suite：只解析，不建任务、不改状态。
        check = parse_github_check_run(payload)
        if check is not None:
            self._send_json(200, check)
            return
        # issue_comment 与 pull_request_review_comment：后者把
        # pull_request.number 归一化成 parser 要的 issue.number。
        result = parse_github_pr_comment(payload)
        if result is None and payload.get("pull_request") and \
                payload.get("comment"):
            normalized = dict(payload)
            normalized["issue"] = {
                "number": (payload["pull_request"] or {}).get("number")}
            result = parse_github_pr_comment(normalized)
        if result is None:
            self._send_json(200, {"result": None})
            return
        # /fix-review 执行：建 queued 任务（不跑模型，worker 认领）。
        conn = self._db()
        try:
            project_row = None
            if repo_name:
                project_row = conn.execute(
                    "SELECT id FROM projects WHERE name = ?",
                    (repo_name,),
                ).fetchone()
            if project_row is None:
                self._send_json(200, dict(
                    result, task_id=None, project_id=None,
                    error="no matching project for repo"))
                return
            project_id = project_row[0]
            task_id = uuid.uuid4().hex
            now = time.time()
            prompt = (
                "[webhook /fix-review] repo=%s pr=%s author=%s\n%s"
                % (result.get("repo"), result.get("pr_number"),
                   result.get("author"), result.get("comment")))
            try:
                conn.execute(
                    "INSERT INTO tasks(id, project_id, prompt, status,"
                    " idempotency_key, depends_on, priority, created_by,"
                    " created_at, updated_at, last_heartbeat)"
                    " VALUES(?, ?, ?, 'queued', ?, '[]', 0, 'system',"
                    " ?, ?, NULL)",
                    (task_id, project_id, prompt,
                     "webhook:%s" % delivery_id if delivery_id else None,
                     now, now),
                )
                conn.commit()
            except (sqlite3.IntegrityError, _PgIntegrityError):
                # 并发/去重兜底：同 delivery 已建过任务时回读它，
                # 不建重复任务、不重复记审计。
                row = conn.execute(
                    "SELECT id FROM tasks WHERE project_id = ?"
                    " AND idempotency_key = ?",
                    (project_id,
                     "webhook:%s" % delivery_id if delivery_id else None),
                ).fetchone()
                if row:
                    self._send_json(200, dict(
                        result, task_id=row[0], project_id=project_id,
                        duplicate=True))
                    return
                raise
        finally:
            conn.close()
        with _auth_store(self.server.db_path) as auth:
            auth.audit("system", project_id, "webhook_fix_review", task_id)
        self._send_json(200, dict(
            result, task_id=task_id, project_id=project_id))

    def _handle_slack_webhook(self):
        raw = self._read_body()
        secret = os.environ.get("SLACK_SIGNING_SECRET")
        if not secret:
            self._send_json(503, {"error": "slack webhook secret not configured"})
            return
        signature = self.headers.get("X-Slack-Signature")
        timestamp = self.headers.get("X-Slack-Request-Timestamp")
        if not verify_slack_signature(secret, timestamp, raw, signature):
            self._send_json(401, {"error": "unauthorized"})
            return
        # 只解析不执行任务：Slack 斜杠命令的执行由控制面后续决定。
        content_type = self.headers.get("Content-Type") or ""
        text = ""
        if "application/x-www-form-urlencoded" in content_type:
            parsed = parse_qs(raw.decode("utf-8", "replace"))
            values = parsed.get("text")
            text = values[0] if values else ""
        elif raw:
            try:
                payload = json.loads(raw.decode("utf-8"))
                if isinstance(payload, dict):
                    text = payload.get("text", "") or ""
                else:
                    text = raw.decode("utf-8", "replace")
            except (ValueError, UnicodeDecodeError):
                text = raw.decode("utf-8", "replace")
        self._send_json(200, parse_slack_command(text))


def create_server(db_path, host="127.0.0.1", port=8765, backend=None):
    """建 server 实例（不自动 serve，供测试与 __main__ 共用）。

    backend 为 None 时读环境变量 CLOUD_DB_BACKEND，未设则默认
    sqlite（旧行为不变）。选 postgres 时在建表之前就调用工厂：
    驱动缺失则初始化即抛明确错误（文案含 psycopg），启动即失败，
    绝不在运行时中途才炸、也绝不静默回落到 SQLite；驱动已装
    且能连上服务器时 Postgres 即为可用后端（适配层见
    cloud/db.py，部署步骤见 cloud/README.md）。
    """
    db_path = str(db_path)
    # 后端校验必须在 init_db 之前：postgres 模式不能先建 SQLite 表
    # 再失败，那会假装 sqlite 已可用。
    _create_database(backend=backend, db_path=db_path)
    init_db(db_path)
    # 确保 AuthStore 的三张表也存在，后续请求才能直接查 project_members。
    with _auth_store(db_path):
        pass
    server = ThreadingHTTPServer((host, port), CloudControlPlaneHandler)
    server.db_path = db_path
    server.daemon_threads = True
    # 限流器：内存滑动窗口，默认值与环境变量覆盖见 RateLimiter；
    # 测试可直接改 server.rate_limit_per_minute / window_seconds。
    server.rate_limiter = RateLimiter(
        per_minute=_rate_limit_from_env(
            "CLOUD_RATE_LIMIT_PER_MINUTE", DEFAULT_RATE_LIMIT_PER_MINUTE),
        window_seconds=_rate_limit_from_env(
            "CLOUD_RATE_LIMIT_WINDOW_SECONDS",
            DEFAULT_RATE_LIMIT_WINDOW_SECONDS))
    server.rate_limit_per_minute = None
    server.rate_limit_window_seconds = None
    # OAuth 回调注入点：生产为 None（走真实换 token + 真实 userinfo），
    # 测试可注入 fake http_client / userinfo_client；绝不注入真实 secret。
    server.oauth_http_client = None
    server.oauth_userinfo_client = None
    return server


def main(argv=None):
    parser = argparse.ArgumentParser(description="cloud control plane")
    parser.add_argument("--host", default="127.0.0.1")
    parser.add_argument("--port", type=int, default=8765)
    parser.add_argument("--db", default="cloud-control-plane.db")
    parser.add_argument("--db-backend", default=None,
                        help="sqlite（默认）或 postgres；未给则读 "
                             "CLOUD_DB_BACKEND 环境变量")
    args = parser.parse_args(argv)
    server = create_server(args.db, args.host, args.port,
                           backend=args.db_backend)
    print(
        "cloud-control-plane listening on %s:%d db=%s"
        % (args.host, server.server_address[1], args.db),
        flush=True,
    )
    try:
        server.serve_forever()
    except KeyboardInterrupt:
        pass


if __name__ == "__main__":
    main()