import time
import requests
import json
import hashlib
import logging
from flask import current_app


# ==========================================
# 1. 配置获取 (从 Flask 全局配置读取)
# ==========================================
def get_config(key):
    """
    优先从 Flask 应用上下文获取配置
    """
    try:
        if current_app:
            return current_app.config.get(key)
    except RuntimeError:
        # 如果在非 Flask 上下文运行（如单独调试），返回 None 或报错
        print("[Warning] Not in Flask context")
        pass
    return None


# ==========================================
# 2. 核心签名算法 (Java 兼容版)
# ==========================================
def generate_signature_final(params, is_json_body=False):
    """
    签名公式: secret + appid + timestamp + paramData + secret -> MD5(lower)
    """
    appid = get_config('IOT_APP_ID')
    secret = get_config('IOT_SECRET')

    # 1. 拷贝参数，避免修改原字典
    params_copy = params.copy()

    # 2. 移除不参与签名的字段 (timestamp, appid, signature)
    # 注意：timestamp 在签名公式中是单独拼接的，不在 paramData 里
    timestamp = str(params_copy.pop('timestamp', int(time.time() * 1000)))
    if 'appid' in params_copy: params_copy.pop('appid')
    if 'signature' in params_copy: params_copy.pop('signature')

    # 3. 生成 paramData
    param_data = ""
    if is_json_body:
        # POST JSON 模式: 无空格 JSON 字符串，按 key 排序
        # separators=(',', ':') 去除默认的空格
        param_data = json.dumps(params_copy, sort_keys=True, separators=(',', ':'), ensure_ascii=False)
    else:
        # GET 键值对模式: key=value 直接拼接 (注意：Java版没有 '&' 符号)
        sorted_keys = sorted([k for k in params_copy.keys() if params_copy[k] is not None])
        kv_list = [f"{k}={params_copy[k]}" for k in sorted_keys]
        param_data = "".join(kv_list)

    # 4. 拼接最终字符串
    sign_str = f"{secret}{appid}{timestamp}{param_data}{secret}"

    # 5. MD5 加密并转小写
    return hashlib.md5(sign_str.encode('utf-8')).hexdigest().lower()


# ==========================================
# 3. 业务接口封装
# ==========================================

def get_access_token():
    """
    登录获取 Token
    """
    base_url = get_config('IOT_BASE_URL')
    login_url = get_config('IOT_URL_LOGIN')

    if not base_url or not login_url:
        print("[IoT API] 配置缺失")
        return None

    url = base_url + login_url
    payload = {
        "username": get_config('IOT_USERNAME'),
        "password": get_config('IOT_PASSWORD')
    }

    try:
        # print(f"DEBUG: 正在登录 IoT 平台...")
        res = requests.post(url, json=payload, timeout=10).json()
        if res.get('code') == 0:
            token = res['data']['accessToken']
            return token
        else:
            print(f"[IoT API] 登录失败: {res.get('msg')}")
            return None
    except Exception as e:
        print(f"[IoT API] 登录异常: {e}")
        return None


def get_iot_card_page(token, page_no=1, page_size=100):
    """
    获取单页卡列表
    """
    base_url = get_config('IOT_BASE_URL')
    page_url = get_config('IOT_URL_PAGE')
    url = base_url + page_url

    timestamp = int(time.time() * 1000)

    params = {
        "appid": get_config('IOT_APP_ID'),
        "pageNo": page_no,
        "pageSize": page_size,
        "timestamp": timestamp
    }

    # 计算签名
    sign = generate_signature_final(params, is_json_body=False)
    params['signature'] = sign

    headers = {'Authorization': f'Bearer {token}'}

    try:
        resp = requests.get(url, params=params, headers=headers, timeout=15)
        return resp.json()
    except Exception as e:
        print(f"[IoT API] 获取列表页失败 (Page {page_no}): {e}")
        return None


def get_iot_card_details_batch(token, iccids):
    """
    批量获取卡详情
    """
    if not iccids: return None

    base_url = get_config('IOT_BASE_URL')
    detail_url = get_config('IOT_URL_DETAIL')
    url = base_url + detail_url

    timestamp = int(time.time() * 1000)

    payload = {
        "iccids": iccids,
        "timestamp": timestamp
    }

    # 计算签名 (POST JSON)
    sign = generate_signature_final(payload, is_json_body=True)
    payload['signature'] = sign
    # 补回 timestamp 到 body 中，因为签名计算时 pop 掉了
    payload['timestamp'] = timestamp

    headers = {
        'Authorization': f'Bearer {token}',
        'Content-Type': 'application/json'
    }

    try:
        resp = requests.post(url, json=payload, headers=headers, timeout=20)
        return resp.json()
    except Exception as e:
        print(f"[IoT API] 获取详情失败: {e}")
        return None


# ==========================================
# 4. 主服务入口 (供 api.py 调用)
# ==========================================

def sync_iot_data_service():
    """
    执行完整的同步流程：
    1. 登录
    2. 遍历所有分页获取 ICCID
    3. 批量查询详情
    4. 返回完整数据列表 (List[Dict])
    """
    print("[IoT Service] 开始同步任务...")

    # 1. 登录
    token = get_access_token()
    if not token:
        return []

    # 2. 循环翻页获取所有 ICCID
    all_iccids = []
    page_no = 1
    page_size = 100

    while True:
        res = get_iot_card_page(token, page_no, page_size)

        # 校验响应
        if not res or (res.get('code') != 0 and res.get('code') != 200):
            print(f"[IoT Service] 列表获取结束或中断: {res.get('msg') if res else 'No Response'}")
            break

        # 解析数据结构 (兼容 data 为 list 或 data.rows)
        data_field = res.get('data', {})
        rows = []
        if isinstance(data_field, list):
            rows = data_field
        elif isinstance(data_field, dict):
            rows = data_field.get('rows', []) or data_field.get('list', [])

        if not rows:
            break

        # 提取 ICCID
        current_batch = [str(x.get('iccid')) for x in rows if x.get('iccid')]
        all_iccids.extend(current_batch)

        # print(f"DEBUG: page {page_no} done, items: {len(current_batch)}")

        # 判断是否最后一页
        if len(rows) < page_size:
            break

        page_no += 1
        time.sleep(0.2)  # 避免请求过快

    total_count = len(all_iccids)
    if total_count == 0:
        print("[IoT Service] 未找到任何卡片")
        return []

    # 3. 分批查询详情
    final_data_list = []
    batch_size = 50

    # print(f"DEBUG: 开始查询 {total_count} 张卡的详情...")

    for i in range(0, total_count, batch_size):
        batch_iccids = all_iccids[i: i + batch_size]

        detail_res = get_iot_card_details_batch(token, batch_iccids)

        if detail_res and (detail_res.get('code') == 0 or detail_res.get('code') == 200):
            details = detail_res.get('data', [])
            if isinstance(details, list):
                final_data_list.extend(details)

        time.sleep(0.2)

    print(f"[IoT Service] 同步完成，共获取 {len(final_data_list)} 条详情数据")

    # 4. 返回列表供 api.py 写入数据库
    return final_data_list