"""
OA 对接 API 基础功能。
"""
import asyncio
import datetime
import json

import apps
import dock
from paste.core import config
from paste.core.logging import echo_log


ApiUrl = config.get_config(f'dock.oa.env.{apps.get_active_env()}.api_url')
"""
对接 API 根目录。
"""


TokenPlatform = config.get_config(f'dock.oa.env.{apps.get_active_env()}.token_platform')
"""
OA Token 平台。
"""


async def new_api_request(api_url: str, request_body: dict, method: str = 'POST',
                          timeout: float = dock.DEFAULT_TIMEOUT, use_form: bool = False, headers: dict = None):
    """
    构造一个 API 请求对象

    :param api_url: API 地址，以斜杠开头的 URI 地址，非完整 URL
    :param request_body: 请求体，即所有请求参数
    :param method: 请求提交方式
    :param timeout: 超时时长
    :param use_form: 是否使用表单（Form）方式提交
    :param headers: 头数据，最高优先级
    :return: HTTPRequest 对象
    """
    # Token
    from dock.oa import oa_security
    token = await oa_security.get_token(TokenPlatform)

    # 构建扩展头
    user_agent, browser_ver, os_name = dock.get_random_user_agent()
    extra_headers = {
        'Content-Type': 'application/json',
        'Token': token,
        'User-Agent': user_agent,
    }
    if headers is not None:
        extra_headers = {**extra_headers, **headers}

    try:
        echo_log(json.dumps(request_body))
    except Exception:
        echo_log(str(request_body))

    # 构造请求对象
    request = dock.new_http_request(
        url=f"{ApiUrl}{api_url}",
        body=request_body,
        method=method,
        timeout=timeout,
        use_form=use_form,
        extra_headers=extra_headers,
    )
    return request


# 使用 asyncio.Lock 保证线（协）程安全
_lock = asyncio.Lock()
# _cache 作为内存缓存，结构 {date: counter}
_cache = {}

async def generate_serial_number():
    """
    取得当日流水号。
    :return: 流水号字符串
    """
    today = datetime.datetime.now().strftime("%Y%m%d")
    async with _lock:
        if today not in _cache:
            _cache[today] = 1
        else:
            _cache[today] += 1
        counter = _cache[today]
    return f"{today}{counter:05d}"