import enum
import uuid

from django.conf import settings
from django.core.files.uploadedfile import UploadedFile
from django.db import models
from pathlib import Path
from pycs_api.models import base
from pycs_api.models.project import Project


class Extensions(enum.Enum):
    JPG = ".jpg"
    JPEG = ".jpeg"
    PNG = ".png"


def project_directory(instance: "File", filename: str):
    project_dir = Path(instance.project.data_folder).relative_to(settings.MEDIA_ROOT)
    return f"{project_dir}/{filename}"

class File(base.BaseModel):

    EXTENSIONS = [
        (Extensions.JPG, "JPG Image"),
        (Extensions.JPEG, "JPEG Image"),
        (Extensions.PNG, "PNG Image"),
    ]

    uuid = models.UUIDField(
        default=uuid.uuid4
    )

    project = models.ForeignKey(
        Project,
        on_delete=models.CASCADE,
        related_name="files",
        related_query_name="file",
    )

    extension = models.CharField(
        max_length=16,
        choices=EXTENSIONS
    )

    size = models.PositiveIntegerField()

    created = models.DateTimeField(auto_now_add=True)

    path = models.ImageField(upload_to=project_directory)

    serializer_fields = base.BaseModel.serializer_fields + [
        "project",
        "created",
        "url",
        "uuid",
    ]

    @property
    def url(self):
        return self.path.url

    @classmethod
    def create(cls, uploaded_file: UploadedFile, project: Project):

        filename = Path(uploaded_file.name)
        file = cls.objects.create(
            project=project,
            size=uploaded_file.size,
            name=filename.stem,
            extension=filename.suffix.lower(),
            path=uploaded_file
        )

        return file


    class Meta:
        unique_together = [
            "project",
            "path"
        ]