from django.shortcuts import render
from django.http import HttpResponse, JsonResponse
from user.models import user
from user.models import student
import pandas as pd
import random
# Create your views here.
def loginpage(request):
    return render(request, 'login.html')

def Loginadmit(request):
    if request.method == 'POST':
        username = request.POST.get('username')
        password = request.POST.get('password')
        print(username,password)
        if user.objects.filter(username=username).exists():
            if user.objects.filter(username=username,password=password).exists():
                request.session["info"]=username
                return render(request, 'firstpage.html')
            else:
                return HttpResponse("密码错误")
        else:
            return HttpResponse("用户名不存在")

    
def Register(request):
    sign=0
    if request.method == 'POST':#判断是否登录
        
        username = request.POST.get('username')
        password = request.POST.get('password')
        qs = user.objects.values
        if user.objects.filter(username=username).exists():
            return HttpResponse("用户名已存在")
        else:
            user.objects.create(username=username,password=password)
            return render(request, 'login.html',{'success':'注册成功'})

# 第一页
def firstpage(request):
    if request.session.get("info"):#判断是否登录
        return render(request, 'firstpage.html')
    else:
        return render(request, 'login.html')
    
#随机点名
def dianming(request):
    if request.session.get("info"):#判断是否登录
        User=user.objects.filter(username=request.session.get("info")).first()#获取当前用户
        studentlist=student.objects.filter(teather_id=User.id)#获取当前用户的学生表
        if len(studentlist)==0:#判断学生表是否为空
            return render(request, 'firstpage.html',{'form':'暂无学生'})        
        #权重随机点名算法
        form=weights_random_choice(studentlist)
        #随机事件
        random_number = random.randint(1, 11)#随机数
        if random_number ==5:#触发事件双倍扣分
            fair='zhongkou'
            return render(request,'firstpage.html',{'form':form.student_name,'sign':fair})
        elif random_number ==6:#触发事件可以指定同学帮忙回答
            fair='lucky'
            return render(request,'firstpage.html',{'form':form.student_name,'sign':fair})
        else:
            return render(request,'firstpage.html',{'form':form.student_name,'sign':'none'})
    else:
        return render(request, 'login.html')
#权重随机点名算法
def weights_random_choice(studentlist):
    # 偏移所有分数
    offset = max(1, abs(min(student.student_score for student in studentlist)))#计算最小值的绝对值
    adjusted_points = [student.student_score + offset for student in studentlist]#添加偏移

     # 计算逆向权重
    inverse_weights = [1 / (point+1) for point in adjusted_points]
     # 归一化逆向权重
    total_inverse_weight = sum(inverse_weights)
    normalized_inverse_weights = [w / total_inverse_weight for w in inverse_weights]
    # 选择一个学生
    selected_student = random.choices(studentlist, weights=normalized_inverse_weights, k=1)[0]
    print(selected_student)
    return selected_student


# 分数写入
def submitscore(request):
    teather=request.session.get("info")#获取当前用户
    if teather:#判断是否登录
        if request.method == 'POST':
            print(request.POST)
            User=user.objects.filter(username=teather).first()#获取当前用户的id
            STdname=request.POST.get('student_name','')#获取被点到的学生姓名
            print(STdname)
            STudent=student.objects.filter(teather_id=User.id,student_name=STdname ).first()#获取被点到的学生
            print(request.POST)
            #{'student_name': ['才需困'], 'daoda': ['1'], 'score1': ['1'], 'score2': ['0.5']}>
            daoda=request.POST.get('daoda','')
            score1=request.POST.get('score1','')
            score2=request.POST.get('score2','')
            if daoda=='1':#到课堂加1分
                STudent.student_score+=1
            elif daoda=='2':#没到扣1分
                STudent.student_score-=1
            elif daoda=='22':#没到扣2分（双倍扣分）
                STudent.student_score-=2
            #重复问题
            if score1=='1':#重复问题加0.5分
                STudent.student_score+=0.5
            elif score1=='2':#重复不了问题扣1分
                STudent.student_score-=1
            elif score1=='22':#重复不了问题扣2分（双倍扣分）
                STudent.student_score-=2
            #回答问题
            STudent.student_score+=float(score2)
            print(STudent.student_score)
            #写入数据库
            STudent.save()
            return render(request, 'firstpage.html')
    else:
        return render(request, 'login.html')
# 第二页
def secondpage(request):
    teather=request.session.get("info")#获取用户信息
    if teather:#判断是否登录
        User=user.objects.filter(username=teather).first()#获取用户
        form=student.objects.filter(teather_id=User.id)
        return render(request, 'secondpage.html',{'form':form})#返回学生数据
    else:
        return render(request, 'login.html')

# 第三页
def thirdpage(request):
    teather=request.session.get("info")#获取用户session信息
    if teather:
        User=user.objects.filter(username=teather).first()#获取当前用户的id

        form=student.objects.filter(teather_id=User.id).order_by('-student_score')

        return render(request, 'thirdpage.html',{"form":form})
    else:
        return render(request, 'login.html')

#上传Excel文件
def upload_excel(request):
    if request.session.get("info"):
        return render(request, 'upload.html')
    else:
        return render(request, 'login.html')
#接收文件
def upload_file(request):
    teather=request.session.get("info")#获取session中的用户名
    if teather:
        User=user.objects.filter(username=teather).first()#获取用户
        if request.method == 'POST':
            excel_file = request.FILES.get('file')#获取excel表格文件
            df=pd.read_excel(excel_file)#读取excel表格
            for index, row in df.iterrows():
                    if student.objects.filter(student_xuehao=row['学号'],teather_id=User.id).exists():#判断是否已经存在当前老师的学生表中
                        continue
                    student.objects.create(student_xuehao=row['学号'],student_name=row['姓名'],student_major=row['专业'],student_class=row['班级'],teather_id=User.id)#写入学生表
            form=student.objects.filter(teather_id=User.id)#返回当前老师的学生表
            return render(request, 'secondpage.html',{'form':form})
    else:
        return render(request, 'login.html')    
    

#删除表格
def delete_excel(request):
    teather=request.session.get("info")#获取session中的用户名
    if teather:
        User=user.objects.filter(username=teather).first()#获取用户
        print("删除当前老师的所有学生")
        student.objects.filter(teather_id=User.id).delete()
        return render(request, 'secondpage.html')
    else:
        return render(request, 'login.html')


#第四页
def fourthpage(request):
    teather=request.session.get("info")#获取当前用户
    if teather:#判断是否登录
        User=user.objects.filter(username=teather).first()#获取当前用户的id
        return render(request, 'fourthpage.html',{'name':User.username})
    else:
        return render(request, 'login.html')
    
#账号和密码修改
def xiugai(request):
    teather=request.session.get("info")#获取当前用户名
    if teather:#判断是否登录
        User=user.objects.filter(username=teather).first()#获取当前用户
        if request.method == 'POST':
            username=request.POST.get('username','')
            password=request.POST.get('password','')
            print(username,password)
            if username=='' and password=='':
                return render(request, 'fourthpage.html',{'name':User.username})
            else:
                if username!='':
                    User.username=username
                if password!='':
                    User.password=password
            User.save()
            return render(request, 'login.html')
    else:
        return render(request, 'login.html')

#账户注销
def zhuxiao(request):
    teather=request.session.get("info")#获取当前用户名
    if teather:#判断是否登录
        User=user.objects.filter(username=teather).first()#获取当前用户
        if request.method == 'POST':
            User.delete()
            return render(request, 'login.html')
    else:
        return render(request, 'login.html')