"""
短信发送服务模块
=============================================================

封装阿里云短信 SDK 提供短信发送能力，供业务模块和定时任务调用。

使用方式：
    from application.services import sms_svc

    # 模板短信（推荐）
    sms_svc.send_sms(
        phone='13800138000',
        template_code='SMS_123456',
        template_params={'code': '123456'}
    )

    # 指定签名（覆盖默认签名）
    sms_svc.send_sms(
        phone='13800138000',
        template_code='SMS_123456',
        template_params={'code': '123456'},
        sign_name='我的应用'
    )

    # 群发（多号码）
    sms_svc.send_sms(
        phone=['13800138000', '13900139000'],
        template_code='SMS_123456',
        template_params={'name': '张三'}
    )
"""

import json
import logging
from typing import Dict, List, Optional, Union

from config import (
    SMS_ALIYUN_ACCESS_KEY_ID,
    SMS_ALIYUN_ACCESS_KEY_SECRET,
    SMS_ALIYUN_CONNECT_TIMEOUT,
    SMS_ALIYUN_ENDPOINT,
    SMS_ALIYUN_READ_TIMEOUT,
    SMS_ALIYUN_SIGN_NAME,
    SMS_PROVIDER,
)

logger = logging.getLogger(__name__)


# ============================================================
# 阿里云短信客户端（延迟初始化）
# ============================================================

_client = None


def _get_client():
    """
    获取阿里云短信客户端（单例，延迟初始化）

    Returns:
        dysmsapi.Client: 阿里云短信客户端实例

    Raises:
        ImportError: 阿里云 SDK 未安装
        Exception: 客户端创建失败
    """
    global _client
    if _client is not None:
        return _client

    try:
        from alibabacloud_dysmsapi20170525.client import Client
        from alibabacloud_tea_openapi.models import Config
    except ImportError:
        raise ImportError(
            "阿里云短信 SDK 未安装，请执行: "
            "pip install alibabacloud-dysmsapi20170525 alibabacloud-tea-openapi"
        )

    config = Config(
        access_key_id=SMS_ALIYUN_ACCESS_KEY_ID,
        access_key_secret=SMS_ALIYUN_ACCESS_KEY_SECRET,
        endpoint=SMS_ALIYUN_ENDPOINT,
        connect_timeout=SMS_ALIYUN_CONNECT_TIMEOUT,
        read_timeout=SMS_ALIYUN_READ_TIMEOUT,
    )
    _client = Client(config)
    return _client


# ============================================================
# 短信发送
# ============================================================

def send_sms(
    phone: Union[str, List[str]],
    template_code: str,
    template_params: Optional[Dict] = None,
    sign_name: Optional[str] = None,
) -> bool:
    """
    发送短信（阿里云模板短信）

    Args:
        phone:          手机号，字符串或列表（群发时传入多个号码）
        template_code:  短信模板CODE（在阿里云控制台获取，如 SMS_123456）
        template_params: 模板变量，如 {'code': '123456'} 对应模板中的 ${code}
        sign_name:      短信签名（可选，默认使用配置中的 SMS_ALIYUN_SIGN_NAME）

    Returns:
        bool: 全部发送成功返回 True，任一失败返回 False
    """
    if not phone:
        logger.warning("发送短信失败：手机号不能为空")
        return False

    if not template_code:
        logger.warning("发送短信失败：模板CODE不能为空")
        return False

    if not sign_name:
        sign_name = SMS_ALIYUN_SIGN_NAME

    if not sign_name:
        logger.warning("发送短信失败：短信签名未配置")
        return False

    # 统一转为列表
    phones = [phone] if isinstance(phone, str) else phone

    # 检查 AccessKey 配置
    if not SMS_ALIYUN_ACCESS_KEY_ID or not SMS_ALIYUN_ACCESS_KEY_SECRET:
        logger.warning("发送短信失败：阿里云 AccessKey 未配置")
        return False

    # 模板变量序列化
    params_str = json.dumps(template_params, ensure_ascii=False) if template_params else ''

    # 逐条发送（阿里云短信 API 不支持批量同发）
    all_success = True
    for p in phones:
        if not _send_one(p, sign_name, template_code, params_str):
            all_success = False

    return all_success


def _send_one(phone: str, sign_name: str, template_code: str, template_params: str) -> bool:
    """
    发送单条短信

    Args:
        phone:          手机号
        sign_name:      短信签名
        template_code:  模板CODE
        template_params: 模板变量 JSON 字符串

    Returns:
        bool: 发送成功返回 True
    """
    try:
        from alibabacloud_dysmsapi20170525 import models as dysms_models

        client = _get_client()

        request = dysms_models.SendSmsRequest(
            phone_numbers=phone,
            sign_name=sign_name,
            template_code=template_code,
            template_param=template_params,
        )

        response = client.send_sms(request)
        body = response.body

        if body.code == 'OK':
            logger.info(f"短信发送成功: phone={phone}, template={template_code}, biz_id={body.biz_id}")
            return True
        else:
            logger.warning(
                f"短信发送失败: phone={phone}, template={template_code}, "
                f"code={body.code}, message={body.message}"
            )
            return False

    except ImportError as e:
        logger.error(f"阿里云短信 SDK 未安装: {str(e)}")
        return False

    except Exception as e:
        logger.error(f"短信发送异常: phone={phone}, template={template_code}, error={str(e)}")
        return False