from django.conf import settings
from django.core.exceptions import ValidationError
from django.utils.crypto import get_random_string

from .. import helpers

# this is used by Media and Encoding models
# reflects media encoding status for objects
MEDIA_ENCODING_STATUS = (
    ("pending", "Pending"),
    ("running", "Running"),
    ("fail", "Fail"),
    ("success", "Success"),
)

# the media state of a Media object
# this is set by default according to the portal workflow
MEDIA_STATES = (
    ("private", "Private"),
    ("public", "Public"),
    ("unlisted", "Unlisted"),
)

# each uploaded Media gets a media_type hint
# by helpers.get_file_type

MEDIA_TYPES_SUPPORTED = (
    ("video", "Video"),
    ("image", "Image"),
    ("pdf", "Pdf"),
    ("audio", "Audio"),
)

ENCODE_EXTENSIONS = (
    ("mp4", "mp4"),
    ("webm", "webm"),
    ("gif", "gif"),
)

ENCODE_RESOLUTIONS = (
    (2160, "2160"),
    (1440, "1440"),
    (1080, "1080"),
    (720, "720"),
    (480, "480"),
    (360, "360"),
    (240, "240"),
    (144, "144"),
)

CODECS = (
    ("h265", "h265"),
    ("h264", "h264"),
    ("vp9", "vp9"),
)

ENCODE_EXTENSIONS_KEYS = [extension for extension, name in ENCODE_EXTENSIONS]
ENCODE_RESOLUTIONS_KEYS = [resolution for resolution, name in ENCODE_RESOLUTIONS]


def generate_uid():
    return get_random_string(length=16)


def original_media_file_path(instance, filename):
    """Helper function to place original media file"""
    file_name = f"{instance.uid.hex}.{helpers.get_file_name(filename)}"
    return settings.MEDIA_UPLOAD_DIR + f"user/{instance.user.username}/{file_name}"


def encoding_media_file_path(instance, filename):
    """Helper function to place encoded media file"""

    file_name = f"{instance.media.uid.hex}.{helpers.get_file_name(filename)}"
    return settings.MEDIA_ENCODING_DIR + f"{instance.profile.id}/{instance.media.user.username}/{file_name}"


def original_thumbnail_file_path(instance, filename):
    """Helper function to place original media thumbnail file"""

    return settings.THUMBNAIL_UPLOAD_DIR + f"user/{instance.user.username}/{filename}"


def subtitles_file_path(instance, filename):
    """Helper function to place subtitle file"""

    return settings.SUBTITLES_UPLOAD_DIR + f"user/{instance.media.user.username}/{filename}"


def category_thumb_path(instance, filename):
    """Helper function to place category thumbnail file"""

    file_name = f"{instance.uid}.{helpers.get_file_name(filename)}"
    return settings.MEDIA_UPLOAD_DIR + f"categories/{file_name}"


def validate_rating(value):
    if -1 >= value or value > 5:
        raise ValidationError("score has to be between 0 and 5")