import json

from django.core import serializers
from django.shortcuts import render

# Create your views here.
from django.http import JsonResponse
from .models import Student

from EduSystemServer.utils import ResponseUtil
from Student.models import Student
from .models import Student
from django.views.decorators.csrf import csrf_exempt
from django.http import QueryDict
from io import BytesIO
from django.http.multipartparser import MultiPartParser
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger


@csrf_exempt
def studnets(request):
    if request.method == "POST":
        try:
            request_data = json.loads(request.body)
            print(request_data)
            student = Student.objects.filter(sid=request_data.get("sid")).first()
            student.username = request_data.get("username")
            student.password = request_data.get("password")
            student.name = request_data.get("name")
            student.sex = request_data.get("sex")
            student.grade = request_data.get("grade")
            student.class_name = request_data.get("class_name")
            student.major = request_data.get("major")
            student.save()
            response = ResponseUtil.ok(student.to_dict(), "更新成功！")
            return JsonResponse(response)
        except Exception as E:
            return JsonResponse(ResponseUtil.error(E))
    elif request.method == "GET":
        sid = request.GET.get('sid')
        s_name = request.GET.get('s_name')
        s_sex = request.GET.get('s_sex')
        s_grade = request.GET.get('s_grade')
        s_class_name = request.GET.get('s_class_name')
        s_major = request.GET.get('s_major')
        data = []
        if sid:
            filtered = Student.objects.filter(sid=sid)
            for student in filtered:
                data.append(student.to_dict())
        elif s_name:
            filtered = Student.objects.filter(s_name=s_name)
            for student in filtered:
                data.append(student.to_dict())
        elif s_sex:
            filtered = Student.objects.filter(s_sex=s_sex)
            for student in filtered:
                data.append(student.to_dict())
        elif s_grade:
            filtered = Student.objects.filter(s_grade=s_grade)
            for student in filtered:
                data.append(student.to_dict())
        elif s_class_name:
            filtered = Student.objects.filter(s_class_name=s_class_name)
            for student in filtered:
                data.append(student.to_dict())
        elif s_major:
            filtered = Student.objects.filter(s_major=s_major)
            for student in filtered:
                data.append(student.to_dict())
        else:
            all_objects = Student.objects.all()
            for studnet in all_objects:
                data.append(studnet.to_dict())
        return JsonResponse({'code': 200, 'msg': 'success', 'data': data}, safe=False)
    elif request.method == "DELETE":
        parser = MultiPartParser(request.META, BytesIO(request.body), request.upload_handlers, request.encoding)
        post_dict = parser.parse()
        sid = post_dict[0]['sid']
        try:
            info = Student.objects.filter(sid=sid).get().to_dict()
            Student.objects.filter(sid=sid).delete()
            response = {"code": 200, "message": "删除成功！", "data": info}
            return JsonResponse(response)
        except:
            response = {"code": 200, "message": "删除失败，未找到学生信息！"}
            return JsonResponse(response)
    elif request.method == "PUT":
        put = MultiPartParser(request.META, request, request.upload_handlers, request.encoding).parse()
        sid = put[0]['sid']
        s_username = put[0]['s_username']
        s_name = put[0]['s_name']
        s_sex = put[0]['s_sex']
        s_grade = put[0]['s_grade']
        s_class_name = put[0]['s_class_name']
        s_major = put[0]['s_major']
        try:
            Student.objects.filter(sid=sid).update(s_username=s_username, s_name=s_name, s_sex=s_sex, s_grade=s_grade,
                                                   s_class_name=s_class_name,
                                                   s_major=s_major)
        except:
            Student.objects.create(sid=sid, s_username=s_username, s_name=s_name, s_sex=s_sex, s_grade=s_grade,
                                   s_class_name=s_class_name,
                                   s_major=s_major)
        data = Student.objects.filter(sid=sid)[0].to_dict()
        return JsonResponse({'code': 200, 'msg': 'success', 'data': data}, safe=False)
        student_list = Student.objects.all()
        response_json = {"code": 200, "message": "success", "data": []}
        for student in student_list:
            response_json["data"].append(student.to_dict())
        return JsonResponse(response_json)
    elif request.method == 'DELETE':
        params = QueryDict(request.body)
        key = next(iter(params.keys()))  # 获取键名
        value = params.get(key)  # 获取值
        xx = str(value).split('-')[0]
        print(xx.split('\r\n'))
        return JsonResponse({'code': 200, 'msg': 'success'}, safe=False)


@csrf_exempt
def add_student(request):
    if not request.method == "POST":
        return JsonResponse(ResponseUtil.error("request method error!"))
    try:
        request_data = json.loads(request.body)
        student = Student()
        student.username = request_data.get("username")
        student.password = request_data.get("password")
        student.name = request_data.get("name")
        student.sex = request_data.get("sex")
        student.grade = request_data.get("grade")
        student.class_name = request_data.get("class_name")
        student.major = request_data.get("major")
        student.save()
        result = ResponseUtil.ok(student.to_dict(), "添加成功！")
    except Exception as E:
        result = ResponseUtil.error(E)
    return JsonResponse(result)

@csrf_exempt
def search_student(request):
    currentPage = request.GET.get("currentPage")
    pageSize = request.GET.get("pageSize")
    request_data = json.loads(request.body)
    search_students = Student.objects.all()
    if not request_data.get("sid") == "":
        search_students =search_students.filter(sid=request_data.get("sid"))
    if not request_data.get("name") == "":
        search_students =search_students.filter(name__contains=request_data.get("name"))
    if not request_data.get("sex") == "":
        search_students =search_students.filter(sex=request_data.get("sex"))
    if not request_data.get("class_name") == "":
        search_students =search_students.filter(class_name__contains=request_data.get("class_name"))
    if not request_data.get("major") == "":
        search_students =search_students.filter(major__contains=request_data.get("major"))
    paginator = Paginator(search_students, pageSize)
    try:
        students = paginator.page(currentPage).object_list
    except PageNotAnInteger:
        students = paginator.page(1)
    except EmptyPage:
        students = paginator.page(paginator.num_pages).object_list
    result = ResponseUtil.ok(json.loads(serializers.serialize("json", students)), "success!")
    result["pageTotal"] = paginator.count
    result["pageNum"] = paginator.num_pages
    return JsonResponse(result)


@csrf_exempt
def del_student(request):
    if not request.method == "GET":
        return JsonResponse(ResponseUtil.error("request method error!"))
    try:
        sid = request.GET.get("sid")
        student = Student.objects.filter(sid=sid).first()
        student.delete()
        result = ResponseUtil.ok(None, "删除成功！")
    except Exception as E:
        result = ResponseUtil.error(E)
    return JsonResponse(result)


def get_select_course_by_id(request):
    pass