import json
from django.db.models.signals import post_save
from django.dispatch import receiver
from asgiref.sync import async_to_sync
from channels.layers import get_channel_layer

from submissions.models import Submission, SubmissionFile, ImageCrop
from submissions.schemas import SubmissionOut, SubmissionFileOut, ImageCropOut


channel_layer = get_channel_layer()


@receiver(post_save, sender=Submission)
def broadcast_submission_update(sender, instance, created, **kwargs):
    if not instance.user:
        return

    user_group_name = f"submissions_user_{instance.user.id}"
    schema = SubmissionOut.model_validate(instance)
    submission_data = schema.model_dump(mode="json")

    async_to_sync(channel_layer.group_send)(
        user_group_name,
        {
            "type": "submission.updated",
            "submission": submission_data,
        }
    )


@receiver(post_save, sender=SubmissionFile)
def broadcast_submission_file_update(sender, instance, created, **kwargs):
    submission = instance.submission
    if not submission.user:
        return

    user_group_name = f"submissions_user_{submission.user.id}"
    schema = SubmissionFileOut.model_validate(instance)
    file_data = schema.model_dump(mode="json")

    async_to_sync(channel_layer.group_send)(
        user_group_name,
        {
            "type": "submission.file.updated",
            "file": file_data,
        }
    )


@receiver(post_save, sender=ImageCrop)
def broadcast_image_crop_update(sender, instance, created, **kwargs):
    submission = instance.submission_file.submission
    if not submission.user:
        return

    user_group_name = f"submissions_user_{submission.user.id}"
    schema = ImageCropOut.model_validate(instance)
    crop_data = schema.model_dump(mode="json")

    async_to_sync(channel_layer.group_send)(
        user_group_name,
        {
            "type": "submission.crop.updated",
            "crop": crop_data,
        }
    )