from django.db import models
from apps.utils.models import CommonAModel, BaseModel, CommonADModel
from apps.system.models import User, Dept

# Create your models here.
class Questioncat(CommonAModel):
    name = models.CharField(max_length=200, verbose_name='名称')
    parent = models.ForeignKey('self', on_delete=models.SET_NULL, null=True, blank=True, verbose_name='父级', related_name='cate_parent')
    sort = models.PositiveIntegerField(default=0, verbose_name='排序')

    class Meta:
        verbose_name = '题库分类'
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name
class Question(CommonAModel):
    Q_DAN = 10
    Q_DUO = 20
    Q_PAN = 30
    Q_EASY = 10
    Q_SIMPLE = 20
    Q_HARD = 30
    name = models.TextField('题干')
    img = models.TextField('题干图片', null=True, blank=True)
    type = models.PositiveSmallIntegerField('题型', choices=((Q_DAN, '单选'), (Q_DUO, '多选'), (Q_PAN, '判断')))
    level = models.PositiveSmallIntegerField('难度', default=Q_SIMPLE, choices=((Q_EASY, '简单'), (Q_SIMPLE, '一般'), (Q_HARD, '困难')))
    questioncat = models.ForeignKey(Questioncat, blank=True, null=True, on_delete=models.SET_NULL, verbose_name='所属题库', related_name='questioncat')
    options = models.JSONField('选项')
    right = models.JSONField('正确答案')
    resolution = models.TextField('解析',  null=True, blank=True)
    enabled = models.BooleanField('是否启用', default=False)
    class Meta:
        verbose_name = '题目'
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name
    

class Paper(CommonAModel):
    name = models.CharField(max_length=200, verbose_name='名称')
    questions = models.ManyToManyField(Question, through='PaperQuestion')
    limit = models.IntegerField(default=0, verbose_name='限时(分钟)')
    total_score = models.FloatField(default=0, verbose_name='满分')
    pass_score = models.FloatField(default=0, verbose_name='通过分数')
    danxuan_count = models.IntegerField(default=0, verbose_name='单选数量')
    danxuan_score = models.FloatField(default=2, verbose_name='单选分数')
    duoxuan_count = models.IntegerField(default=0, verbose_name='多选数量')
    duoxuan_score = models.FloatField(default=4, verbose_name='多选分数')
    panduan_count = models.IntegerField(default=0, verbose_name='判断数量')
    panduan_score = models.FloatField(default=2, verbose_name='判断分数')
    class Meta:
        verbose_name = '押题卷'
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name
    

class PaperQuestion(BaseModel):
    paper = models.ForeignKey(Paper, on_delete=models.CASCADE, verbose_name='试卷')
    question = models.ForeignKey(Question, on_delete=models.CASCADE, verbose_name='试题')
    total_score = models.FloatField(default=0, verbose_name='单题满分')
    sort = models.IntegerField(default=0, verbose_name='排序')


class Exam(CommonADModel):
    name = models.CharField('名称', max_length=100)
    open_time = models.DateTimeField('开启时间')
    close_time = models.DateTimeField('关闭时间', null=True, blank=True)
    chance = models.IntegerField('考试机会', default=1) # 0表示不限次数
    paper = models.ForeignKey(Paper, verbose_name='使用的试卷', on_delete=models.SET_NULL, null=True, blank=True)
    is_public = models.BooleanField('是否公开', default=False)
    p_users = models.ManyToManyField(User, verbose_name='指定用户', blank=True)
    p_depts = models.ManyToManyField(Dept, verbose_name='指定部门', blank=True)
    paper_json = models.JSONField('试卷JSON', null=True, blank=True)

    class Meta:
        verbose_name = '在线考试'
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name

class ExamRecord(CommonADModel):
    '''
    考试记录表
    '''
    exam = models.ForeignKey(Exam, on_delete=models.CASCADE, verbose_name='关联考试', related_name='record_exam')
    score = models.FloatField(default=0, verbose_name='得分')
    took = models.IntegerField(default=0, verbose_name='耗时(秒)')
    start_time = models.DateTimeField(verbose_name='开始答题时间')
    end_time = models.DateTimeField(verbose_name='结束答题时间', null=True, blank=True)
    questions = models.ManyToManyField(Question, verbose_name='答题记录', through='AnswerDetail')
    is_pass = models.BooleanField(default=True, verbose_name='是否通过')
    is_submited = models.BooleanField(default=False, verbose_name='是否提交')
    is_last = models.BooleanField(default=False, verbose_name='是否最后一次考试记录')

    class Meta:
        verbose_name = '考试记录'
        verbose_name_plural = verbose_name


class AnswerDetail(BaseModel):
    examrecord = models.ForeignKey(ExamRecord, on_delete=models.CASCADE, related_name='detail_er')
    total_score = models.FloatField(default=0, verbose_name='该题满分') 
    question = models.ForeignKey(Question, on_delete=models.CASCADE)
    user_answer = models.JSONField(null=True,blank=True)
    score = models.FloatField(default=0, verbose_name='本题得分')
    is_right = models.BooleanField(default=False, verbose_name='是否正确')

    class Meta:
        verbose_name = '答题记录'
        verbose_name_plural = verbose_name