from django.shortcuts import render

# Create your views here.
from django.http import JsonResponse
from course.models import *
from django.views.decorators.csrf import csrf_exempt
from io import BytesIO
from django.http.multipartparser import MultiPartParser

@csrf_exempt
def courses(request):
    if request.method == "POST":
        course = Course()
        course.c_name = request.POST.get("c_name")
        course.type = request.POST.get('type')
        course.credit = request.POST.get("credit")
        course.tid = request.POST.get('tid')
        course.save()
        response = {"code": 200, "message": "添加成功！", "data": course.to_dict()}
        return JsonResponse(response)
    elif request.method == "GET":
        cid = request.GET.get('cid')
        c_name = request.GET.get('c_name')
        c_type = request.GET.get('type')
        tid = request.GET.get('tid')
        data = []
        if cid:
            filtered = Course.objects.filter(cid=cid)
            for item in filtered:
                data.append(item.to_dict())
        elif c_name:
            filtered = Course.objects.filter(name=c_name)
            for item in filtered:
                data.append(item.to_dict())
        elif c_type:
            filtered = Course.objects.filter(type=c_type)
            for item in filtered:
                data.append(item.to_dict())
        elif tid:
            filtered = Course.objects.filter(tid=tid)
            for item in filtered:
                data.append(item.to_dict())
        else:
            all_objects = Course.objects.all()
            for item in all_objects:
                data.append(item.to_dict())
        return JsonResponse({'code': 200, 'msg': 'success', 'data': data}, safe=False)
    elif request.method == "DELETE":
        delete = MultiPartParser(request.META, BytesIO(request.body), request.upload_handlers, request.encoding).parse()
        cid = delete[0]['cid']
        try:
            info = Course.objects.filter(cid=cid).get().to_dict()
            Course.objects.filter(cid=cid).delete()
            response = {"code": 200, "message": "删除成功！", "data": info}
            return JsonResponse(response)
        except:
            response = {"code": 200, "message": "删除失败，未找到课程信息！"}
            return JsonResponse(response)
    elif request.method == "PUT":
        put = MultiPartParser(request.META, request, request.upload_handlers, request.encoding).parse()
        cid = put[0]['cid']
        c_name = put[0]['c_name']
        c_type = put[0]['type']
        credit = put[0]['credit']
        tid = put[0]['tid']
        Course.objects.filter(cid=cid).update(c_name=c_name, type=c_type, credit=credit, tid=tid)
        data = Course.objects.filter(cid=cid)[0].to_dict()
        return JsonResponse({'code': 200, 'msg': 'success', 'data': data}, safe=False)