#coding=utf-8
'''
'''
import json
import logging
import re
import traceback
import datetime
import hashlib

from django import http
from django.contrib.sessions.backends.cache import SessionStore
from django.core.cache import cache
from django.http import HttpResponse, JsonResponse
from django.shortcuts import render
from django.utils.decorators import method_decorator
from django.views import View
from django.views.decorators.csrf import csrf_exempt
from django.core.serializers.json import DjangoJSONEncoder

from common import error_info
from common.models import UserInfo
import common.error_info as ce

logger = logging.getLogger(__name__)


class CusDjangoJSONEncoder(json.JSONEncoder):
    """
    JSONEncoder subclass that knows how to encode date/time, decimal types and UUIDs.
    """
    def default(self, o):
        # See "Date Time String Format" in the ECMA-262 specification.
        if isinstance(o, datetime.datetime):
            r = datetime.datetime.strftime(o,'%Y-%m-%d %H:%M:%S')
            return r
        elif isinstance(o, datetime.date):
            return o.isoformat()
        elif isinstance(o, datetime.time):
            if is_aware(o):
                raise ValueError("JSON can't represent timezone-aware times.")
            r = o.isoformat()
            if o.microsecond:
                r = r[:12]
            return r
        elif isinstance(o, datetime.timedelta):
            return duration_iso_string(o)
        elif isinstance(o, decimal.Decimal):
            return str(o)
        elif isinstance(o, uuid.UUID):
            return str(o)
        elif isinstance(o, Promise):
            return six.text_type(o)
        elif isinstance(o, CallableBool):
            return bool(o)
        else:
            return super(DjangoJSONEncoder, self).default(o)


class SignView(View):
    """
    """
    def __init__(self):
        self.client_id = "1088"
        self.client_key = "3dea5896-0a5e-453f-821e-4db555c7cdb4"

    def get_ip(self,request):
        if request.META.has_key('HTTP_X_REAL_IP'):
            ip = request.META['HTTP_X_REAL_IP']
        elif request.META.has_key('HTTP_X_FORWARDED_FOR'):
            ip = request.META['HTTP_X_FORWARDED_FOR']
        else:
            ip = request.META['REMOTE_ADDR']
        return ip

    def gen_sign(self,params):
        """
        """
        params.pop("sign")
        keys = params.keys()
        keys.sort()
        signstr = ""
        for key in keys:
            signstr += u"{}={}&".format(key,params.get(key))
        signstr += "key={}".format(self.client_key)
        md5 = hashlib.md5(signstr).hexdigest().upper()
        return md5

    def check_auth(self,handler,request,*args,**kwargs):
        """鉴权
        """
        params = request.json
        sign = params.get("sign")

        if self.gen_sign(params) != sign:
            return JsonResponse({"status":"error","message":u"签名错误,sign的值错误!"})

        return handler(request,*args,**kwargs)

    @method_decorator(csrf_exempt)
    def dispatch(self, request, *args, **kwargs):
        """
        """
        if request.method.lower() in self.http_method_names:
            handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
            body = request.body if hasattr(request, "body") else ""
            if request.content_type == "application/x-www-form-urlencoded":
                info = http.QueryDict(body)
            elif request.content_type == "application/json":
                info = json.loads(body) if body else {}
            else:
                info = {}

            setattr(request, "json", info)
        else:
            handler = self.http_method_not_allowed
        return self.check_auth(handler,request,*args,**kwargs)



class AuthView(View):

    @method_decorator(csrf_exempt)
    def dispatch(self, request, *args, **kwargs):
        """
        @attention: as_view()方法使用该方法来分发不同http method,添加异常处理及登陆校验
        """
        if request.method.lower() in self.http_method_names:
            handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
        else:
            handler = self.http_method_not_allowed
        return api_wapper(handler, request, True, *args, **kwargs)

class AdminView(View):

    @method_decorator(csrf_exempt)
    def dispatch(self, request, *args, **kwargs):
        """
        @attention: as_view()方法使用该方法来分发不同http method,添加异常处理及登陆校验
        """
        self.http_method_names.append("options")
        if request.method.lower() in self.http_method_names:
            handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
        else:
            handler = self.http_method_not_allowed
        return admin_handler(handler, request, True, *args, **kwargs)


class BaseView(View):

    @method_decorator(csrf_exempt)
    def dispatch(self, request, *args, **kwargs):
        """
        @attention: as_view()方法使用该方法来分发不同http method,添加异常处理及登陆校验
        """
        if request.method.lower() in self.http_method_names:
            handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
        else:
            handler = self.http_method_not_allowed

        return api_wapper(handler, request, False, *args, **kwargs)


class UploadView(View):
    
    @method_decorator(csrf_exempt)
    def dispatch(self, request, *args, **kwargs):
        """
        @attention: as_view()方法使用该方法来分发不同http method,添加异常处理及登陆校验
        """
        if request.method.lower() in self.http_method_names:
            handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
        else:
            handler = self.http_method_not_allowed

        return upload_wapper(handler,request,True, *args, **kwargs)


class InnerView(View):
    
    @method_decorator(csrf_exempt)
    def dispatch(self, request, *args, **kwargs):
        """
        @attention: as_view()方法使用该方法来分发不同http method,添加异常处理及登陆校验
        """
        if request.method.lower() in self.http_method_names:
            handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
            if request.META.get("HTTP_TOKEN") != "7dpHIhpweckghdoSvrXwMftcjZRIzKwJ":
                handler = self.http_method_not_allowed
        else:
            handler = self.http_method_not_allowed

        return api_wapper(handler, request, False, *args, **kwargs)


def show_history(request):
    logined_history = cache.get("logined_history", {})
    for k, v in logined_history.iteritems():
        logger.info("k: %s, v: %s", str(k), str(v))
    logger.info("current session: %s", str(request.session.session_key))
    ss = SessionStore(request.session.session_key)
    for k, v in ss.iteritems():
        logger.info("k: %s, v: %s", str(k), str(v))


def api_wapper(handler, request, is_vauth, *args, **kwargs):
    """
    @attention: 调试API时使用的装饰器
    """
    req_path = request.META["PATH_INFO"]
    ip = request.META.get("HTTP_X_REAL_IP","")
    openid = request.META.get("HTTP_OPENID")
    user = UserInfo.objects.filter(openid=openid).first()
    #if is_vauth and not request.user.is_authenticated():
    if is_vauth and not user:
        return HttpResponse(status=403)

    body = request.body if hasattr(request, "body") else ""
    if "x-www-form-urlencoded" in request.content_type:
        info = http.QueryDict(body).dict()
        if not info:
            info = request.GET.dict()
    elif "application/json" in request.content_type:
        info = json.loads(body) if body else {}
        if not info:
            info = request.GET.dict()
    else:
        try:
            info = json.loads(body) if body else {}
            if not info:
                info = request.GET.dict()
        except:
            info = {}

    print 66666666666666666666666
    setattr(request, "json", info)
    setattr(request, "ip", get_ip(request))
    setattr(request, "user", user)
    if request.method == "OPTIONS":
        return JsonResponse({})
    try:
        ret = handler(request, *args, **kwargs)
        return ret
    except Exception as e:
        return to_fail(e)

def admin_handler(handler, request, is_vauth, *args, **kwargs):
    """
    登录session校验
    """
    req_path = request.META["PATH_INFO"]
    ip = request.META.get("HTTP_X_REAL_IP","")
    print request.META,9999
    openid = request.META.get("HTTP_OPENID")
    user = UserInfo.objects.filter(openid=openid).first()
    if is_vauth and not request.user.is_authenticated():
        return HttpResponse(status=403)

    body = request.body if hasattr(request, "body") else ""
    if "x-www-form-urlencoded" in request.content_type:
        info = http.QueryDict(body).dict()
        if not info:
            info = request.GET.dict()
    elif "application/json" in request.content_type:
        info = json.loads(body) if body else {}
        if not info:
            info = request.GET.dict()
    else:
        try:
            info = json.loads(body) if body else {}
            if not info:
                info = request.GET.dict()
        except:
            info = {}

    setattr(request, "json", info)
    setattr(request, "ip", get_ip(request))
    #setattr(request, "user", user)
    try:
        ret = handler(request, *args, **kwargs)
        return ret
    except Exception as e:
        return to_fail(e)

def upload_wapper(handler,request,is_vauth, *args, **kwargs):
    """
    @attention: 上传使用
    """
    logger.info("request.GET: %s", str(request.GET))
    if is_vauth and (not request.user.is_authenticated()):
        return to_redirect("/")
    info = {}
    setattr(request, "json", info)
    setattr(request, "ip", get_ip(request))
    try:
        ret = handler(request, *args, **kwargs)
        logger.info("ret: %s", str(ret.content))
        return ret
    except error_info.TipException as e:
        return to_normal_fail(e.msg)
    except le.ReasonException as e:
        # operation log here
        user = request.user
        name = user.realname
        email = user.name
        return to_normal_fail(e.msg)
    except le.SpecialReasonException as e:
        user = request.user
        name = user.realname
        email = user.name
        e.inner_info.update({'reason': e.msg})
        return to_normal_fail(e.msg)
    except:
        traceback.print_exc()
        return to_normal_fail("system error!")


def to_suc(data={}):
    info = {}
    info["data"] = data
    info["code"] = 0
    return JsonResponse(info,encoder=CusDjangoJSONEncoder)

def to_suc_msg(data={},msg=""):
    info = {}
    info["data"] = data
    info["msg"] = msg
    info["status"] = "suc"
    return JsonResponse(info)


def to_normal_fail(msg=""):
    info = {}
    info["code"] = 1000
    info["message"] = msg
    return JsonResponse(info)

def to_fail(e=None):
    info = {}
    info["code"] = 1000
    if isinstance(e,ce.TipException):
        info["message"] = e.msg
    else:
        info["message"] = str(e)
    return JsonResponse(info)

def to_redirect(curl):
    info = {}
    info["status"] = "red"
    info["url"] = curl
    return JsonResponse(info)

def to_render(request,template,data={}):
    return render(request,template,data)


def raw_json(data):
    return JsonResponse(data, safe=False)

def tracefail():
    traceback.print_exc()

EXCEL_TYPE = "application/vnd.ms-excel"


def stream_file(content, content_type, file_name):
    """
    输出文件
    :param content: 内容 StringIO 类型
    :param content_type: 类型  eg: "application/vnd.ms-excel"
    :param file_name: 文件名（需指定后缀）
    """
    response = HttpResponse(content=content, content_type=content_type)
    response['Content-Disposition'] = 'attachment; filename={}'.format(file_name)
    return response


def check_permission(*codes):
    code_set = set(codes)

    def function_wapper(fn):
        def wapper(cls, request, *args, **kargs):
            try:
                user = UserInfo.objects.filter(pk=request.user.id).first()
                plist = json.loads(user.role.permission_codes) if user else []
            except Exception as e:
                plist = []
            pset = set(plist)
            #logger.info("have permission: %s, need permission: %s", str(plist), str(code_set))
            flag = True
            for code in code_set:
                res = filter(lambda item: re.match(item, code), pset)
                if not (code in code_set):
                    flag = False
                    break
            if flag:
                return fn(cls, request, *args, **kargs)
            else:
                return to_normal_fail(u"该用户没有此操作权限")

        return wapper

    return function_wapper


def get_ip(request):
    if request.META.has_key('HTTP_X_REAL_IP'):
        ip = request.META['HTTP_X_REAL_IP']
    elif request.META.has_key('HTTP_X_FORWARDED_FOR'):
        ip = request.META['HTTP_X_FORWARDED_FOR']
    else:
        ip = request.META['REMOTE_ADDR']
    return ip