ForcePilot/backend/package/yuxi/external_systems/integrations/microsoft365/operations.py

"""Microsoft 365 discover / preview_tools / create_tools handler 实现。

handler 签名遵循 ``OperationHandler`` 协议：
``(source_type: str, system_config: dict[str, Any]) -> Awaitable[Any]``。

handler 内部职责（见设计文档 §3.7 / §4.2 / §6.5）：

1. 从 ``system_config`` 提取 ``cloud`` / ``api_version`` / ``auth_type`` /
   ``_resolved_token`` 等。
2. 推导 ``auth_mode``（``application`` / ``delegated``）。
3. 构建 ``auth_headers``（token 由 use_cases 层注入到
   ``system_config["_resolved_token"]``）。
4. 构造带 429 退避的 ``request_fn``，可选调用 ``GET /v1.0/$metadata`` 补全字段类型。
5. 调用 ``Microsoft365ConfigGenerator`` 生成 Tool 配置草稿。

429 退避分层（见设计文档 §6.5）：

- **L1: handler 内部退避** — 本模块 ``_request_with_retry`` 实现（解析 Retry-After）。
- **L2: 工具运行时退避** — 通过工具 ``retry_policy.retry_status_codes: [429]`` 配置，
  由框架 executor 基于 tenacity 重试。
"""

from __future__ import annotations

import asyncio
from collections.abc import Awaitable, Callable
from typing import TYPE_CHECKING, Any

from yuxi.external_systems.exceptions import (
    AuthError,
    DomainValidationError,
    ExecutionError,
    RateLimitExceededError,
)
from yuxi.external_systems.integrations.microsoft365.cloud_endpoints import (
    resolve_graph_host,
    validate_cloud,
)
from yuxi.external_systems.integrations.microsoft365.error_extractor import (
    map_microsoft365_error,
)
from yuxi.external_systems.integrations.microsoft365.generators import (
    Microsoft365ConfigGenerator,
)
from yuxi.external_systems.integrations.microsoft365.resource_catalog import (
    RESOURCE_CATALOG,
    TEAMS_RESOURCE_CATALOG,
    TEAMS_RESOURCES,
)
from yuxi.external_systems.integrations.microsoft365.teams_permissions import (
    get_teams_permissions,
)
from yuxi.external_systems.integrations.schemas import GeneratedToolsDraft

if TYPE_CHECKING:
    import httpx

# discover/preview/create 阶段 429 退避参数
_RETRY_MAX_ATTEMPTS = 5
_RETRY_BASE_DELAY = 1.0

# Graph 通用请求头（除 Authorization 外）
_GRAPH_HEADERS: dict[str, str] = {
    "Accept": "application/json",
    "Content-Type": "application/json; charset=utf-8",
}

# auth_type -> auth_mode 映射
_AUTH_TYPE_TO_MODE: dict[str, str] = {
    "microsoft365_client_credentials": "application",
    "microsoft365_authorization_code": "delegated",
}


def _resolve_auth_mode(system_config: dict[str, Any]) -> str:
    """从 ``system_config["auth_type"]`` 推导 ``auth_mode``。

    - ``microsoft365_client_credentials`` → ``application``
    - ``microsoft365_authorization_code`` → ``delegated``
    """
    auth_type = system_config.get("auth_type", "")
    if auth_type not in _AUTH_TYPE_TO_MODE:
        raise DomainValidationError(
            f"microsoft365 不支持的 auth_type: {auth_type}，仅允许 {list(_AUTH_TYPE_TO_MODE.keys())}"
        )
    return _AUTH_TYPE_TO_MODE[auth_type]


def _resolve_cloud(system_config: dict[str, Any]) -> str:
    """从 ``system_config["connection_config"]["cloud"]`` 读取并校验 cloud。"""
    connection_config = system_config.get("connection_config") or {}
    cloud = connection_config.get("cloud", "global")
    return validate_cloud(cloud)


def _resolve_api_version(system_config: dict[str, Any]) -> str:
    """从 ``system_config["connection_config"]["api_version"]`` 读取，默认 ``v1.0``。"""
    connection_config = system_config.get("connection_config") or {}
    return str(connection_config.get("api_version", "v1.0"))


def _resolve_base_url(system_config: dict[str, Any]) -> str:
    """从 ``system_config["connection_config"]["base_url"]`` 读取，缺省由 cloud 推导。"""
    connection_config = system_config.get("connection_config") or {}
    base_url = connection_config.get("base_url")
    if base_url:
        return str(base_url).rstrip("/")
    cloud = _resolve_cloud(system_config)
    return resolve_graph_host(cloud)


def _resolve_resources(system_config: dict[str, Any]) -> list[str]:
    """从 ``discovery_options.resources`` 读取，缺省返回全部 P0 + Teams 资源维度。"""
    discovery_options = system_config.get("discovery_options") or {}
    resources = discovery_options.get("resources")
    if resources:
        return list(resources)
    return [item["resource"] for item in RESOURCE_CATALOG] + [item["resource"] for item in TEAMS_RESOURCE_CATALOG]


def _build_auth_headers(system_config: dict[str, Any]) -> dict[str, str]:
    """从 ``system_config["_resolved_token"]`` 提取 token，构建 Graph 请求头。

    handler 不自行换取 token——token 获取/刷新由 use_cases 层通过
    ``TokenManager.get_token`` 预处理后注入到 ``system_config["_resolved_token"]``。
    若 ``_resolved_token`` 缺失，抛 ``AuthError``（与 dynamics365 一致）。
    """
    token_info = system_config.get("_resolved_token")
    if not isinstance(token_info, dict) or not token_info.get("access_token"):
        raise AuthError("microsoft365: system_config 缺少 _resolved_token，use_cases 层未注入 token")
    access_token = token_info["access_token"]
    headers = dict(_GRAPH_HEADERS)
    headers["Authorization"] = f"Bearer {access_token}"
    return headers


async def _request_with_retry(
    method: str,
    url: str,
    headers: dict[str, str],
    *,
    max_retries: int = _RETRY_MAX_ATTEMPTS,
    base_delay: float = _RETRY_BASE_DELAY,
) -> httpx.Response:
    """handler 内部 HTTP 调用的 429 退避（仅用于 discover/preview/create 阶段）。

    优先使用响应头 ``Retry-After``，否则指数退避（``base_delay * 2 ** attempt``）。
    运行时工具执行的 429 退避由框架 executor + 工具 ``retry_policy`` 处理。

    非 2xx 响应（非 429）通过 ``map_microsoft365_error`` 转换为
    ``ExternalSystemError`` 子类。网络层异常（超时 / 连接错误）转换为
    ``ExecutionError``。
    """
    import httpx

    try:
        async with httpx.AsyncClient() as client:
            last_response: httpx.Response | None = None
            for attempt in range(max_retries + 1):
                response = await client.request(method, url, headers=headers)
                if response.status_code != 429:
                    last_response = response
                    break
                if attempt == max_retries:
                    retry_after_header = response.headers.get("Retry-After", "60")
                    try:
                        retry_after = int(retry_after_header)
                    except ValueError:
                        retry_after = 60
                    raise RateLimitExceededError(
                        f"Microsoft Graph 限流，已重试 {max_retries} 次仍失败: {url}",
                        retry_after=retry_after,
                        limit_type="qps",
                    )
                # 优先使用 Retry-After 头，否则指数退避
                retry_after_header = response.headers.get("Retry-After")
                if retry_after_header:
                    try:
                        delay = float(retry_after_header)
                    except ValueError:
                        delay = base_delay * (2**attempt)
                else:
                    delay = base_delay * (2**attempt)
                await asyncio.sleep(delay)
    except httpx.RequestError as exc:
        raise ExecutionError(f"Microsoft Graph 网络请求失败: {exc}") from exc

    assert last_response is not None
    if last_response.is_success:
        return last_response
    # 非 2xx：解析错误 body 并映射为 ExternalSystemError 子类
    try:
        error_body = last_response.json()
    except Exception:
        error_body = {"error": {"message": last_response.text}}
    raise map_microsoft365_error(last_response.status_code, error_body)


def _make_request_fn() -> Callable[[str, str, dict[str, str]], Awaitable[httpx.Response]]:
    """构造带 429 退避的 request_fn，供元数据发现函数使用。"""

    async def request_fn(method: str, url: str, headers: dict[str, str]) -> httpx.Response:
        return await _request_with_retry(method, url, headers)

    return request_fn


def _build_generator_payload(
    system_config: dict[str, Any],
    auth_headers: dict[str, str],
) -> dict[str, Any]:
    """从 system_config 构造生成器 payload（见 ``Microsoft365ConfigGenerator.generate``）。"""
    return {
        "auth_mode": _resolve_auth_mode(system_config),
        "cloud": _resolve_cloud(system_config),
        "api_version": _resolve_api_version(system_config),
        "base_url": _resolve_base_url(system_config),
        "auth_headers": auth_headers,
        "auth_type": system_config.get("auth_type", "microsoft365_client_credentials"),
        "auth_config": system_config.get("auth_config") or {},
        "resources": _resolve_resources(system_config),
        "request_fn": _make_request_fn(),
    }


def _has_teams_resources(resources: list[str]) -> bool:
    """判断资源列表中是否包含 Teams 维度资源。"""
    return any(resource in TEAMS_RESOURCES for resource in resources)


async def _verify_teams_permissions(
    system_config: dict[str, Any],
    auth_mode: str,
    auth_headers: dict[str, str],
) -> None:
    """验证 Teams 权限已授予（见设计文档 §4.2 / §6.4）。

    通过调用 Graph API 健康检查端点验证 Teams 权限：
    - application 模式：``GET {base_url}/v1.0/teams?$top=1``
    - delegated 模式：``GET {base_url}/v1.0/me/joinedTeams``

    权限验证失败时由 ``_request_with_retry`` → ``map_microsoft365_error`` 抛出
    ``AccessDeniedError`` / ``AuthError``，**不静默标记 ``permission_missing``**——
    权限缺失属于配置问题，应在 discover 阶段暴露而非运行时触发 403。
    """
    base_url = _resolve_base_url(system_config)
    api_version = _resolve_api_version(system_config)
    if auth_mode == "application":
        url = f"{base_url}/{api_version}/teams?$top=1"
    else:
        url = f"{base_url}/{api_version}/me/joinedTeams"
    await _request_with_retry("GET", url, auth_headers)


async def discover_microsoft365(
    source_type: str,
    system_config: dict[str, Any],
) -> list[dict[str, Any]]:
    """discover handler：发现 Microsoft 365 可用资源（含 Teams 维度）。

    handler 不自行换取 token，token 由 use_cases 层注入到
    ``system_config["_resolved_token"]["access_token"]``（见设计文档 §3.7）。

    Returns:
        资源摘要列表，每项含 ``resource`` / ``paths``（按 auth_mode 选择 ``/me``
        或 ``/users/{id}`` 或 ``/teams/{id}``）/ ``required_permissions`` / ``methods``。
    """
    auth_mode = _resolve_auth_mode(system_config)
    resources = _resolve_resources(system_config)
    auth_headers = _build_auth_headers(system_config)

    # Teams 资源在发现范围内时，调用 Graph API 验证 Teams 权限已授予。
    # 权限验证失败抛 AccessDeniedError / AuthError，不静默标记 permission_missing。
    if _has_teams_resources(resources):
        await _verify_teams_permissions(system_config, auth_mode, auth_headers)

    results: list[dict[str, Any]] = []
    for resource in resources:
        # M365 通用资源维度
        for item in RESOURCE_CATALOG:
            if item["resource"] != resource:
                continue
            paths_entry = item.get("paths", {})
            results.append(
                {
                    "resource": resource,
                    "paths": paths_entry.get(auth_mode, ""),
                    "required_permissions": item.get("permissions", {}).get(auth_mode, []),
                    "methods": ["GET", "POST", "PATCH", "DELETE"],
                }
            )
            break
        # Teams 资源维度
        if resource in TEAMS_RESOURCES:
            for item in TEAMS_RESOURCE_CATALOG:
                if item["resource"] != resource:
                    continue
                paths_entry = item.get("paths", {})
                results.append(
                    {
                        "resource": resource,
                        "paths": paths_entry.get(auth_mode, ""),
                        "required_permissions": get_teams_permissions(resource, auth_mode),
                        "methods": ["GET", "POST", "PATCH", "DELETE"],
                    }
                )
                break
    return results


async def preview_microsoft365_tools(
    source_type: str,
    system_config: dict[str, Any],
) -> list[dict[str, Any]]:
    """preview_tools handler：预览将生成的 Tool 列表（不持久化）。

    Returns:
        工具预览列表，每项为 ``ExternalToolCreateInput`` 兼容的 dict。
    """
    auth_headers = _build_auth_headers(system_config)
    payload = _build_generator_payload(system_config, auth_headers)
    generator = Microsoft365ConfigGenerator()
    return await generator.generate(payload)


async def create_microsoft365_tools(
    source_type: str,
    system_config: dict[str, Any],
) -> GeneratedToolsDraft:
    """create_tools handler：生成 Tool 草稿，返回 ``GeneratedToolsDraft``（不直接持久化）。

    持久化由 use_cases 层 ``integration_tool_service`` / ``import_service`` 统一完成。
    """
    auth_headers = _build_auth_headers(system_config)
    payload = _build_generator_payload(system_config, auth_headers)
    generator = Microsoft365ConfigGenerator()
    tool_configs = await generator.generate(payload)
    return GeneratedToolsDraft(tool_configs=tool_configs, override_existing=False)