from MySQLdb import IntegrityError
from django.shortcuts import render

# Create your views here.

# Create your views here.
from django.http import JsonResponse
from .models import Teacher
from django.views.decorators.csrf import csrf_exempt
from io import BytesIO
from django.http.multipartparser import MultiPartParser
from django.http import QueryDict
from course.models import Course, SC
from Student.models import Student
from django.db.models import Q
from django.db.models import Subquery, OuterRef
from django.core.exceptions import ObjectDoesNotExist

from EduSystemServer.utils import ResponseUtil


@csrf_exempt
def teacher(request): # 教师个人信息修改
    if request.method == "POST":
        teacher_information = Teacher()
        teacher_information.username = request.POST.get('username')
        teacher_information.password = request.POST.get('password')
        teacher_information.name = request.POST.get('name')
        teacher_information.sex = request.POST.get('sex')
        teacher_information.title = request.POST.get('title')
        teacher_information.education = request.POST.get('education')
        teacher_information.dept = request.POST.get('dept')
        teacher_information.save()
        response = ResponseUtil.ok(teacher_information.to_dict(), "老师信息插入成功")
        return JsonResponse(response)

    elif request.method == "GET":
        name = request.GET.get('name')
        sex = request.GET.get('sex')
        title = request.GET.get('title')
        education = request.GET.get('education')
        dept = request.GET.get('dept')
        # 定义空查询条件
        conditions = Q()
        if name:
            conditions &= Q(name=name)
        if sex:
            conditions &= Q(sex=sex)
        if title:
            conditions &= Q(title=title)
        if education:
            conditions &= Q(education=education)
        if dept:
            conditions &= Q(dept=dept)
        # 添加非空查询条件至基本查询集
        query = Teacher.objects.filter(conditions)
        data = query.values()  # 将 QuerySet 对象转换为字典列表
        data = list(data)  # 转换为列表以便序列化为 JSON
        print(query)
        response = ResponseUtil.ok(data, "老师信息查询成功")
        return JsonResponse(response)

    elif request.method == "DELETE":
        parser = MultiPartParser(request.META, BytesIO(request.body), request.upload_handlers, request.encoding)
        posdict = parser.parse()
        print(posdict)
        tid = int(posdict[0]['tid'])
        print(tid)
        try:
            info = Teacher.objects.filter(tid=tid).get().to_dict()
            Teacher.objects.filter(tid=tid).delete()
            response = {"code": 200, "message": "删除成功！", "data": info}
            return JsonResponse(response)
        except:
            response = ResponseUtil.ok("")
            return JsonResponse(response)
    elif request.method == 'PUT':
        put = MultiPartParser(request.META, request, request.upload_handlers, request.encoding).parse()
        # request.PUT = put[0]
        print(put)
        tid = put[0]['tid']
        name = put[0]['name']
        sex = put[0]['sex']
        title = put[0]['title']
        education = put[0]['education']
        dept = put[0]['dept']
        Teacher.objects.filter(tid=tid).update(name=name,sex=sex,title=title)
        Teacher.objects.filter(tid=tid).update(education=education,dept=dept)
        data = Teacher.objects.filter(tid=tid)[0].to_dict()
        return JsonResponse({'code': 200, 'msg': 'success','data':data}, safe=False)

def delete(request):
    tid = request.GET.get('tid')
    try:
        Teacher.objects.filter(tid = tid).delete()
        return JsonResponse({'code': 200, 'msg': 'success'}, safe=False)
    except:
        return JsonResponse({'code': 200, 'msg': '删除失败'}, safe=False)

@csrf_exempt
def teaching_resources(request): # 课程程序
    if request.method == 'POST':
        cid = int(request.POST.get('cid'))
        name = request.POST.get('name')
        type = request.POST.get('type')
        credit = request.POST.get('credit')
        tid = int(request.POST.get('tid'))
        teacher_name = request.POST.get('t_name')
        # 定义空子字典查询条件
        conditions = {}
        if cid:
            conditions.update({'cid': cid}) # 追加信息
        if name:
            conditions.update({'name': cid})
        if type:
            conditions.update({'type': cid})
        if credit:
            conditions.update({'credit': cid})
        if tid:
            conditions.update({'tid': cid})
        if teacher_name:
            conditions.update({'teacher_name': teacher_name})
        def check_subdict_exists(dictionary, subdict): # 判断子字典是否存在字典
            for key, value in subdict.items():
                if key not in dictionary or dictionary[key] != value:
                    return False
            return True
        # 获取第一个查询表的数据
        table1_result = Teacher.objects.values('tid', 'name', 'title', 'dept')
        # 获取第二个查询表的数据
        table2_result = Course.objects.values('tid', 'cid', 'name', 'type', 'credit')
        # 构建子查询，获取第一个查询表的结果并注入到第二个查询表中
        table2_result = table2_result.annotate(teacher_name=Subquery(
            table1_result.filter(tid=OuterRef('tid')).values('name')[:1]
        ), teacher_title=Subquery(
            table1_result.filter(tid=OuterRef('tid')).values('title')[:1]
        ), teacher_dept=Subquery(
            table1_result.filter(tid=OuterRef('tid')).values('dept')[:1]
        ))
        # 合并两个查询表的结果
        merged_result =list(table2_result)
        combined_data = []
        print(conditions)
        # 输出合并结果
        for item in merged_result:
            # 判断子字典是否存在于字典中
            print(item)
            if check_subdict_exists(item, conditions):
                combined_data.append(item)
        response = ResponseUtil.ok(combined_data, "课程信息查询成功")
        return JsonResponse(response)

    elif request.method == "GET":
        # 获取第一个查询表的数据
        table1_result = Teacher.objects.values('tid', 'name', 'title', 'dept')
        # 获取第二个查询表的数据
        table2_result = Course.objects.values('tid', 'cid', 'name', 'type', 'credit')
        # 构建子查询，获取第一个查询表的结果并注入到第二个查询表中
        table2_result = table2_result.annotate(teacher_name=Subquery(
            table1_result.filter(tid=OuterRef('tid')).values('name')[:1]
        ), teacher_title=Subquery(
            table1_result.filter(tid=OuterRef('tid')).values('title')[:1]
        ), teacher_dept=Subquery(
            table1_result.filter(tid=OuterRef('tid')).values('dept')[:1]
        ))
        data = list(table2_result)  # 转换为列表以便序列化为 JSON
        response = ResponseUtil.ok(data, "课程信息查询成功")
        return JsonResponse(response)

@csrf_exempt
def query_student_information(request): # 学生信息查询
    if request.method == 'POST':
        name = request.POST.get('name')
        sid = request.POST.get('sid')
        sex = request.POST.get('sex')
        grade = request.POST.get('grade')
        class_name = request.POST.get('class_name')
        major = request.POST.get('major')
        # 定义空查询条件
        conditions = Q()
        if name:
            conditions &= Q(name=name)
        if sid:
            conditions &= Q(sid=sid)
        if sex:
            conditions &= Q(sex=sex)
        if grade:
            conditions &= Q(grade=grade)
        if class_name:
            conditions &= Q(class_name=class_name)
        if major:
            conditions &= Q(major=major)
        # 添加非空查询条件至基本查询集
        query = Student.objects.filter(conditions)
        data = query.values()  # 将 QuerySet 对象转换为字典列表
        data = list(data)  # 转换为列表以便序列化为 JSON
        print(query)
        response = ResponseUtil.ok(data, "学生信息查询成功")
        return JsonResponse(response)
    elif request.method == "GET":
        query = Student.objects.all()
        data = query.values()  # 将 QuerySet 对象转换为字典列表
        data = list(data)  # 转换为列表以便序列化为 JSON
        response = ResponseUtil.ok(data, "学生信息查询成功")
        return JsonResponse(response)
@csrf_exempt
def student_performance_management(request): # 学生成绩管理
    if request.method == "POST": # 学生成绩录入
        sid = request.POST.get('sid')
        cid = request.POST.get('cid')
        middle_grade = float(request.POST.get('middle_grade'))
        end_grade = float(request.POST.get('end_grade'))
        if middle_grade <= 100 and middle_grade >= 0 and end_grade <= 100 and end_grade >= 0:
            query = SC.objects.filter(sid = sid, cid =cid)
            if query.exists(): # 如果学生存在，则修改学生成绩
                query.update(middle_grade = middle_grade, end_grade= end_grade)
            else: # 如果学生成绩不存在，则插入学生成绩信息
                sc = SC()
                sid = Student.objects.get(sid=sid)
                cid = Course.objects.get(cid=cid)
                sc.sid = sid
                sc.cid = cid
                sc.middle_grade = middle_grade
                sc.end_grade=end_grade
                sc.save()
            filtered = SC.objects.filter(sid = sid, cid =cid)
            data = filtered.values()# 将 QuerySet 对象转换为字典列表
            data = list(data) # 转换为列表以便序列化为 JSON
            response = ResponseUtil.ok(data,"学生成绩录入成功")
            return JsonResponse(response)
        else:
            response = ResponseUtil.error("成绩输入有误")
            return JsonResponse(response)
    elif request.method == "GET":
        cid = request.GET.get('cid')
        c_name = request.GET.get('c_name')
        sid = request.GET.get('sid')
        s_name = request.GET.get('s_name')
        data = []
        if c_name:
            data.append(SC.objects.filter(cid__name=c_name))
        elif s_name:
            data.append(SC.objects.filter(sid__name=s_name))
        elif sid and cid:
            data.append(SC.objects.filter(sid=sid, cid=cid))
        elif sid:
            data.append(SC.objects.filter(sid=sid))
        elif cid:
            data.append(SC.objects.filter(cid=cid))
        else:
            data.append(SC.objects.all())
        response = ResponseUtil.ok(list(data[0].values()), "成绩查询成功")
        return JsonResponse(response)

    elif request.method == "DELETE":
        put = MultiPartParser(request.META, request, request.upload_handlers, request.encoding).parse()
        sid = put[0]['sid']
        print(sid)
        try:
            info = SC.objects.filter(sid=sid)
            data = info.values()  # 将 QuerySet 对象转换为字典列表
            data = list(data)  # 转换为列表以便序列化为 JSON
            print(info)
            SC.objects.filter(sid=sid).delete()
            response = ResponseUtil.ok(data,"删除成功！")
            return JsonResponse(response)
        except:
            response = ResponseUtil.error("未找到学生成绩")
            return JsonResponse(response)
    elif request.method == 'PUT':
        put = MultiPartParser(request.META, request, request.upload_handlers, request.encoding).parse()
        # request.PUT = put[0]
        print(put)
        sid = put[0]['sid']
        cid = put[0]['cid']
        middle_grade = put[0]['middle_grade']
        end_grade = put[0]['end_grade']
        SC.objects.filter(sid=sid, cid=cid).update(middle_grade=middle_grade)
        SC.objects.filter(sid=sid, cid=cid).update(end_grade=end_grade)
        filtered = SC.objects.filter(sid=sid, cid=cid)
        data = filtered.values()  # 将 QuerySet 对象转换为字典列表
        data = list(data)  # 转换为列表以便序列化为 JSON
        response = ResponseUtil.ok(data, "学生成绩修改成功")
        return JsonResponse(response)

@csrf_exempt
def course_selection(request):
    if request.method == 'POST':
        # 假设需要将 tid 为 1 的老师赋值给某个课程的 tid 字段
        teacher_id = int(request.POST.get('tid'))
        try:
            course = Course()
            course.name = request.POST.get('name')
            course.type = request.POST.get('type')
            course.credit = int(request.POST.get('credit'))
            course.tid = Teacher.objects.get(tid=teacher_id)  # 将 Teacher 对象赋给 Course.tid 字段
            course.save()
            response = ResponseUtil.ok(course.tid_dict(), "课程信息插入成功")
            return JsonResponse(response)
        except ObjectDoesNotExist:
            response = ResponseUtil.error("找不到 id 为 " + str(teacher_id)+" 的老师")
            return JsonResponse(response)
        except IntegrityError:
            response = ResponseUtil.error("插入数据失败：tid_id 列不能为 null")
            return JsonResponse(response)
    if request.method == 'DELETE':
        parser = MultiPartParser(request.META, BytesIO(request.body), request.upload_handlers, request.encoding)
        posdict = parser.parse()
        print(posdict)
        cid = int(posdict[0]['cid'])
        print(cid)
        try:
            data = Course.objects.filter(cid=cid).get()
            Course.objects.filter(cid=cid).delete()
            response = ResponseUtil.ok(data.tid_dict, "删除课程成功！")
            return JsonResponse(response)
        except:
            response = ResponseUtil.ok("未查询到课程，删除失败")
            return JsonResponse(response)
    if request.method == 'PUT':
        put = MultiPartParser(request.META, request, request.upload_handlers, request.encoding).parse()
        # request.PUT = put[0]
        print(put)
        cid = put[0]['cid']
        name = put[0]['name']
        type = put[0]['type']
        credit = put[0]['credit']
        tid = put[0]['tid']
        if cid and name and type and credit and tid:
            Course.objects.filter(cid=cid).update(name=name, type=type, credit=credit)
            Course.objects.filter(cid=cid).update(tid=Teacher.objects.get(tid=tid))
            data = Course.objects.filter(cid=cid)[0].tid_dict()
            response = ResponseUtil.ok(data, "课程信息修改成功")
            return JsonResponse(response)
        else:
            response = ResponseUtil.error("课程信息修改失败，信息不全")
            return JsonResponse(response)