from django.db import models
from django.conf import settings
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.utils.translation import gettext_lazy as _


class OnlineExamEvent(models.Model):

    EVENT_EXIT_FULLSCREEN = 'ExitFullScreen'
    EVENT_LOSTFOCUS = 'LostFocus'
    EVENT_IDENTITY_VERIFICATION = 'IdentityVerification'
    EVENT_GET_PAPER = 'GetPaper'
    EVENT_SAVE_DRAFT = 'SaveDraft'
    EVENT_SUBMIT = 'Submit'
    EVENT_ADMIN_FORCE_SUBMIT = 'AdminForceSubmit'
    EVENT_ADMIN_WARING_MESSAGE = 'AdminWarningMessage'
    EVENT_IDENTITY_FAILED = 'IdentityFailed'
    EVENT_FACE_CHECK_FAILED = 'FaceCheckFailed'

    EVENT_CHOICES = (
        (EVENT_EXIT_FULLSCREEN, _('Exit Full Screen')),
        (EVENT_LOSTFOCUS, _('Lost Focus')),
        (EVENT_IDENTITY_VERIFICATION, _('Identity Verification')),
        (EVENT_GET_PAPER, _('Get Paper')),
        (EVENT_SAVE_DRAFT, _('Save Draft')),
        (EVENT_SUBMIT, _('Submit Paper')),
        (EVENT_ADMIN_FORCE_SUBMIT, _('Force Submit By Admin')),
        (EVENT_ADMIN_WARING_MESSAGE, _('Send Warning Message By Admin')),
        (EVENT_IDENTITY_FAILED, _('Examinee Identity Failed')),
        (EVENT_FACE_CHECK_FAILED, _('Examinee Face Check Failed')),
    )

    user = models.ForeignKey(
        settings.AUTH_USER_MODEL, on_delete=models.DO_NOTHING)
    online_exam = models.ForeignKey(
        'university.OnlineExam', on_delete=models.CASCADE)
    user_online_exam = models.ForeignKey(
        'university.UserOnlineExam', on_delete=models.CASCADE)
    event_type = models.CharField(max_length=64, choices=EVENT_CHOICES)
    comment = models.CharField(max_length=255)
    ip = models.CharField(max_length=255, blank=True, null=True)
    user_agent = models.CharField(max_length=255, blank=True, null=True)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        db_table = 'online_exam_events'


@receiver(
    post_save,
    sender='university.OnlineExamEvent',
    dispatch_uid='_sync_online_exam_event_to_wechat')
def _sync_online_exam_event_to_wechat(sender, instance, created, **kwargs):
    # 将用户的异常操作发送到企业微信
    if not created or not instance.online_exam.alert_wechat_webhook:
        return

    # 跳过正常操作
    if instance.event_type in [
        OnlineExamEvent.EVENT_GET_PAPER,
        OnlineExamEvent.EVENT_SAVE_DRAFT,
        OnlineExamEvent.EVENT_SUBMIT]:
        return

    from university.tasks.online_exam import async_send_alert_to_wechat

    examinee_admin_url = '{}/admin/dashboard#/online-exam/{}/examinee/{}'.format(
        settings.BASE_URL, instance.online_exam_id, instance.user_id)

    msg_content = '### [{} - {} 异常行为]({})\n>\n'.format(
        instance.online_exam.name,
        instance.user_online_exam.examinee_name,
        examinee_admin_url)
    msg_content += '>**事件类型:**{}\n>\n'.format(instance.event_type)
    msg_content += '>**事件说明:**{}\n>\n'.format(instance.get_event_type_display())
    if instance.comment:
        msg_content += '>**备注:**{}\n>\n'.format(instance.comment)
    async_send_alert_to_wechat.delay(
        instance.online_exam.alert_wechat_webhook, msg_content)