import datetime
import json
import re

import requests
import xml.etree.ElementTree
from urllib.parse import urljoin
from django.db.models import Q
from django_filters.rest_framework import DjangoFilterBackend
from django_redis import get_redis_connection
from rest_framework import filters
from rest_framework import viewsets
from django.views.decorators.csrf import csrf_exempt
from django.http.response import JsonResponse, HttpResponse
# from rest_framework.response import Response
from django.utils import timezone
from dspt_api.util.sign import Sign
from dspt_api.models import EcChannel, EcEnv, EcApi, EcApiParams, EcCinemaIds, EcRequestLog, EcApiGroup
from dspt_api.serializers import EcChannelSerializer, EcEnvSerializer, EcApiSerializer, EcApiParamsSerializer, \
    EcCinemaIdsSerializer, EcRequestLogSerializer, EcApiGroupSerializer
from dspt_api.util.suggest_params import suggest_params
from dspt_api.util.general.handle_xml_resp import HandleXmlResp
from dspt_api.util.general.format_xml import format_xml
import chardet

# Create your views here.
class EcChannelViewSet(viewsets.ModelViewSet):
    queryset = EcChannel.objects.all()
    serializer_class = EcChannelSerializer


class EcEnvViewSet(viewsets.ModelViewSet):
    queryset = EcEnv.objects.all()
    serializer_class = EcEnvSerializer


class EcApiViewSet(viewsets.ModelViewSet):
    queryset = EcApi.objects.all()
    serializer_class = EcApiSerializer
    filter_backends = (DjangoFilterBackend,)
    # http://172.16.1.114:8000/ec/get_api?type=nonmember
    filterset_fields = ('type',)


class EcApiParamsViewSet(viewsets.ModelViewSet):
    queryset = EcApiParams.objects.all()
    serializer_class = EcApiParamsSerializer
    filter_backends = (DjangoFilterBackend,)
    # http://172.16.1.114:8000/ec/get_api_params?api_id=1
    filterset_fields = ('api_id',)


class EcCinemaIdsViewSet(viewsets.ModelViewSet):
    queryset = EcCinemaIds.objects.all()
    serializer_class = EcCinemaIdsSerializer


class EcRequestLogViewSet(viewsets.ModelViewSet):
    queryset = EcRequestLog.objects.all()
    serializer_class = EcRequestLogSerializer


class EcApiGroupViewSet(viewsets.ModelViewSet):
    queryset = EcApiGroup.objects.all()
    serializer_class = EcApiGroupSerializer
    filter_backends = (DjangoFilterBackend,)
    # http://172.16.1.114:8000/ec/get_api_group?type=nonmember
    filterset_fields = ('type',)


# 内部方法，用于生成requests请求对象
def handle_request(_request):
    """
        POST请求参数
        env dspt或zyds
        member_type member或nonmember
        api api地址
        params 请求参数
        """
    req = json.loads(_request.body)
    env = req.get('env')
    member_type = req.get('member_type')
    api = req.get('api')
    params = json.loads(req.get('params'))
    resp_format = params['format']
    try:
        base_url = EcEnv.objects.filter(Q(code=env) & Q(type=member_type)).values('host').first()['host']
    except Exception as e:
        return False, e
    pid = params.get('pid')
    try:
        key = EcChannel.objects.filter(Q(pid=pid) & Q(env=env)).values('channel_key').first()['channel_key']
    except Exception as e:
        return False, e
    sign = Sign(key)
    req_params = sign.add_sig(params)
    req_obj = prepare_request(base_url, api, req_params)
    return req_obj, req_params['_sig']


# 内部方法，用于拼接请求
def prepare_request(_url, _api, _params):
    req = requests.PreparedRequest()
    req.prepare_method('GET')
    req.prepare_url(url=urljoin(_url, _api), params=_params)
    req.prepare_headers({'host': _url[7:]})
    return req


@csrf_exempt
def get_api_params_by_api_type(request):
    """
    对比接口用于获取指定类型的接口参数
    http://172.16.1.168:8000/ec/get_params_by_type?type=nonmember
    """
    # 通过Api model获取会员或非会员的api id
    _type = request.GET.get('type')
    api_list = EcApi.objects.filter(type=_type).values('id')
    api_id = [api['id'] for api in api_list]
    # 通过 api id 查询对应api的参数
    api_params = EcApiParams.objects.filter(api_id__in=api_id)
    params_data = EcApiParamsSerializer(api_params, many=True).data
    # 组织数据结构，根据api id分组
    api_params_dict = {}
    for params in params_data:
        if params['api_id'] in api_params_dict.keys():
            api_params_dict[params['api_id']].append(params)
        else:
            api_params_dict[params['api_id']] = [params]
    return JsonResponse(api_params_dict, json_dumps_params={'ensure_ascii': False})


# 通过接口获取推荐参数的入口函数
@csrf_exempt
def get_suggest_params_by_api(request):
    # 获取基础数据
    member_type = request.GET.get('member_type')
    api = request.GET.get('api')
    user_ip = request.META.get('REMOTE_ADDR')
    params = suggest_params(member_type, api, user_ip)
    return JsonResponse(params, safe=False)


# 外部接口， 用于实时生成url并返回前端
@csrf_exempt
def general_api_url(request):
    """
    此接口为POST接口
    request 包含
    env dspt或zyds
    member_type member或nonmember
    api api地址
    params 请求参数
    """
    # req = json.loads(request.body)
    # params = json.loads(req.get('params'))
    # resp_format = params['format']
    req_obj, sig = handle_request(request)
    failed_resp_data = {'url': '请检查foramt、pid参数', 'sig': ''}
    result = {'url': req_obj.url, 'sig': sig}
    if req_obj is False:
        return JsonResponse(failed_resp_data)
    return JsonResponse(result)


#  对外接口，用于收集用户提交内容后发送请求
@csrf_exempt
def send_request(request):
    """
    request 包含
    1. 请求链接 request_url
    2. 返回数据 response_data
    3. 接口 api
    4. 环境 env
    """
    # 获取返回类型结果
    req = json.loads(request.body)
    params = json.loads(req.get('params'))
    resp_format = params['format']
    member_type = req.get('member_type')
    # 初始化redis
    redis_conn = get_redis_connection()
    user_ip = request.META.get('REMOTE_ADDR')
    web_req = json.loads(request.body)
    api = web_req.get('api')
    redis_key_api = f'dspt_api_{user_ip}_{member_type}_{api}'
    # redis_key_user_data = f'dspt_api_{user_ip}_{api}_data'

    # 发送请求
    req, sig = handle_request(request)
    failed_resp_data = {'url': '请检查foramt、pid参数', 'sig': ''}

    if req is False:
        return JsonResponse(failed_resp_data)
    response = requests.Session().send(req)
    print('response', response.content)

    # 记录Redis
    if redis_conn.exists(redis_key_api):
        redis_conn.delete(redis_key_api)
    data = {
        'request_url': req.url,
        'member_type': member_type,
        'format': resp_format,
        'params': params,
        'response_data': response.text
    }
    print(data)
    redis_conn.set(redis_key_api, json.dumps(data), 10 * 60 * 60)
    # redis_conn.delete(redis_key_user_data)
    # 插入数据
    db_data = {
        'ip': user_ip,
        'env': web_req.get('env'),
        'request': req.url,
        'response': response.content,
        'request_datetime': timezone.now(),
    }
    print(db_data)
    EcRequestLog.objects.create(**db_data)
    # 处理xml数据
    handled_data = ''
    _data = ''
    if resp_format == 'json':
        _data = response.text
        handled_data = json.loads(response.text)
    if resp_format == 'xml':
        _data = format_xml(re.sub(r'>\n?\s+?<', r'>\n<', response.text))
        print('---format_xml-----', _data)
        handled_data = HandleXmlResp(response.text).format_xml()
    return JsonResponse({'format': resp_format, 'data': _data, 'handled': json.dumps(handled_data)})


# 对外接口，用于收集用户选择的数据，例如场次，卖品等，以便后续接口直接调用
@csrf_exempt
def set_user_select_data(request):
    """
    参数 包含
    1. api地址
    2. 接口类型 会员 非会员
    3. 接口数据类型 json xml
    4. 用户选择数据
    """
    # 获取返回类型结果
    req = json.loads(request.body)
    api = req.get('api')
    member_type = req.get('member_type')
    resp_format = req.get('format')
    user_data = req.get('user_data')
    user_ip = request.META.get('REMOTE_ADDR')
    # 初始化redis
    redis_conn = get_redis_connection()
    redis_key_user_data = f'dspt_api_{user_ip}_{member_type}_{api}_user_data'
    # 记录用户选择
    data = {
        'api': api,
        'member_type': member_type,
        'format': resp_format,
        'user_data': user_data,
    }
    if redis_conn.exists(redis_key_user_data):
        redis_conn.delete(redis_key_user_data)
    if redis_conn.set(redis_key_user_data, json.dumps(data), 10 * 60 * 60):
        return JsonResponse({'result': 'success'})
    return JsonResponse({'result': 'fail'})


@csrf_exempt
def clear_user_select_data(request):
    """
        参数 包含
        1. api地址
        2. 接口类型 会员 非会员
    """
    # 获取返回类型结果
    req = json.loads(request.body)
    api = req.get('api')
    member_type = req.get('member_type')
    user_ip = request.META.get('REMOTE_ADDR')
    # 初始化redis
    redis_conn = get_redis_connection()
    redis_key_user_data = f'dspt_api_{user_ip}_{member_type}_{api}_user_data'
    if redis_conn.exists(redis_key_user_data):
        if redis_conn.delete(redis_key_user_data):
            return JsonResponse({'result': 'success'})
    return JsonResponse({'result': 'fail'})


# 对外接口，用于给前端提供上次请求的数据，如果没有则返回数据库中的默认值
# 若果有些字段是依赖于其他接口返回值生成的则单独处理此接口， 单独处理逻辑在util目录下
@csrf_exempt
def get_last_request_data(request):
    redis_conn = get_redis_connection()
    user_ip = request.META.get('REMOTE_ADDR')
    api = request.get('api')

    match api:
        case '':
            pass
        case _:
            pass