import tempfile
import uuid

from django.conf import settings
from django.contrib.postgres.fields import JSONField
from django.contrib.contenttypes.fields import GenericForeignKey
from django.contrib.contenttypes.models import ContentType
from django.core.exceptions import ObjectDoesNotExist
from django.core.serializers.json import DjangoJSONEncoder
from django.db import models
from django.utils import timezone
from django.urls import reverse

from funkwhale_api.common import session
from funkwhale_api.common import utils as common_utils
from funkwhale_api.music import utils as music_utils

from . import utils as federation_utils

TYPE_CHOICES = [
    ("Person", "Person"),
    ("Application", "Application"),
    ("Group", "Group"),
    ("Organization", "Organization"),
    ("Service", "Service"),
]


def empty_dict():
    return {}


def get_shared_inbox_url():
    return federation_utils.full_url(reverse("federation:shared-inbox"))


class FederationMixin(models.Model):
    # federation id/url
    fid = models.URLField(unique=True, max_length=500, db_index=True)
    url = models.URLField(max_length=500, null=True, blank=True)

    class Meta:
        abstract = True


class ActorQuerySet(models.QuerySet):
    def local(self, include=True):
        return self.exclude(user__isnull=include)

    def with_current_usage(self):
        qs = self
        for s in ["pending", "skipped", "errored", "finished"]:
            qs = qs.annotate(
                **{
                    "_usage_{}".format(s): models.Sum(
                        "libraries__uploads__size",
                        filter=models.Q(libraries__uploads__import_status=s),
                    )
                }
            )

        return qs


class Actor(models.Model):
    ap_type = "Actor"

    fid = models.URLField(unique=True, max_length=500, db_index=True)
    url = models.URLField(max_length=500, null=True, blank=True)
    outbox_url = models.URLField(max_length=500)
    inbox_url = models.URLField(max_length=500)
    following_url = models.URLField(max_length=500, null=True, blank=True)
    followers_url = models.URLField(max_length=500, null=True, blank=True)
    shared_inbox_url = models.URLField(max_length=500, null=True, blank=True)
    type = models.CharField(choices=TYPE_CHOICES, default="Person", max_length=25)
    name = models.CharField(max_length=200, null=True, blank=True)
    domain = models.CharField(max_length=1000)
    summary = models.CharField(max_length=500, null=True, blank=True)
    preferred_username = models.CharField(max_length=200, null=True, blank=True)
    public_key = models.TextField(max_length=5000, null=True, blank=True)
    private_key = models.TextField(max_length=5000, null=True, blank=True)
    creation_date = models.DateTimeField(default=timezone.now)
    last_fetch_date = models.DateTimeField(default=timezone.now)
    manually_approves_followers = models.NullBooleanField(default=None)
    followers = models.ManyToManyField(
        to="self",
        symmetrical=False,
        through="Follow",
        through_fields=("target", "actor"),
        related_name="following",
    )

    objects = ActorQuerySet.as_manager()

    class Meta:
        unique_together = ["domain", "preferred_username"]

    @property
    def webfinger_subject(self):
        return "{}@{}".format(self.preferred_username, settings.FEDERATION_HOSTNAME)

    @property
    def private_key_id(self):
        return "{}#main-key".format(self.fid)

    @property
    def full_username(self):
        return "{}@{}".format(self.preferred_username, self.domain)

    def __str__(self):
        return "{}@{}".format(self.preferred_username, self.domain)

    def save(self, **kwargs):
        lowercase_fields = ["domain"]
        for field in lowercase_fields:
            v = getattr(self, field, None)
            if v:
                setattr(self, field, v.lower())

        super().save(**kwargs)

    @property
    def is_local(self):
        return self.domain == settings.FEDERATION_HOSTNAME

    @property
    def is_system(self):
        from . import actors

        return all(
            [
                settings.FEDERATION_HOSTNAME == self.domain,
                self.preferred_username in actors.SYSTEM_ACTORS,
            ]
        )

    @property
    def system_conf(self):
        from . import actors

        if self.is_system:
            return actors.SYSTEM_ACTORS[self.preferred_username]

    def get_approved_followers(self):
        follows = self.received_follows.filter(approved=True)
        return self.followers.filter(pk__in=follows.values_list("actor", flat=True))

    def should_autoapprove_follow(self, actor):
        return False

    def get_user(self):
        try:
            return self.user
        except ObjectDoesNotExist:
            return None

    def get_current_usage(self):
        actor = self.__class__.objects.filter(pk=self.pk).with_current_usage().get()
        data = {}
        for s in ["pending", "skipped", "errored", "finished"]:
            data[s] = getattr(actor, "_usage_{}".format(s)) or 0

        data["total"] = sum(data.values())
        return data


class InboxItem(models.Model):
    """
    Store activities binding to local actors, with read/unread status.
    """

    actor = models.ForeignKey(
        Actor, related_name="inbox_items", on_delete=models.CASCADE
    )
    activity = models.ForeignKey(
        "Activity", related_name="inbox_items", on_delete=models.CASCADE
    )
    type = models.CharField(max_length=10, choices=[("to", "to"), ("cc", "cc")])
    is_read = models.BooleanField(default=False)


class Delivery(models.Model):
    """
    Store deliveries attempt to remote inboxes
    """

    is_delivered = models.BooleanField(default=False)
    last_attempt_date = models.DateTimeField(null=True, blank=True)
    attempts = models.PositiveIntegerField(default=0)
    inbox_url = models.URLField(max_length=500)

    activity = models.ForeignKey(
        "Activity", related_name="deliveries", on_delete=models.CASCADE
    )


class Activity(models.Model):
    actor = models.ForeignKey(
        Actor, related_name="outbox_activities", on_delete=models.CASCADE
    )
    recipients = models.ManyToManyField(
        Actor, related_name="inbox_activities", through=InboxItem
    )
    uuid = models.UUIDField(default=uuid.uuid4, unique=True)
    fid = models.URLField(unique=True, max_length=500, null=True, blank=True)
    url = models.URLField(max_length=500, null=True, blank=True)
    payload = JSONField(default=empty_dict, max_length=50000, encoder=DjangoJSONEncoder)
    creation_date = models.DateTimeField(default=timezone.now, db_index=True)
    type = models.CharField(db_index=True, null=True, max_length=100)

    # generic relations
    object_id = models.IntegerField(null=True)
    object_content_type = models.ForeignKey(
        ContentType,
        null=True,
        on_delete=models.SET_NULL,
        related_name="objecting_activities",
    )
    object = GenericForeignKey("object_content_type", "object_id")
    target_id = models.IntegerField(null=True)
    target_content_type = models.ForeignKey(
        ContentType,
        null=True,
        on_delete=models.SET_NULL,
        related_name="targeting_activities",
    )
    target = GenericForeignKey("target_content_type", "target_id")
    related_object_id = models.IntegerField(null=True)
    related_object_content_type = models.ForeignKey(
        ContentType,
        null=True,
        on_delete=models.SET_NULL,
        related_name="related_objecting_activities",
    )
    related_object = GenericForeignKey(
        "related_object_content_type", "related_object_id"
    )


class AbstractFollow(models.Model):
    ap_type = "Follow"
    fid = models.URLField(unique=True, max_length=500, null=True, blank=True)
    uuid = models.UUIDField(default=uuid.uuid4, unique=True)
    creation_date = models.DateTimeField(default=timezone.now)
    modification_date = models.DateTimeField(auto_now=True)
    approved = models.NullBooleanField(default=None)

    class Meta:
        abstract = True

    def get_federation_id(self):
        return federation_utils.full_url(
            "{}#follows/{}".format(self.actor.fid, self.uuid)
        )


class Follow(AbstractFollow):
    actor = models.ForeignKey(
        Actor, related_name="emitted_follows", on_delete=models.CASCADE
    )
    target = models.ForeignKey(
        Actor, related_name="received_follows", on_delete=models.CASCADE
    )

    class Meta:
        unique_together = ["actor", "target"]


class LibraryFollow(AbstractFollow):
    actor = models.ForeignKey(
        Actor, related_name="library_follows", on_delete=models.CASCADE
    )
    target = models.ForeignKey(
        "music.Library", related_name="received_follows", on_delete=models.CASCADE
    )

    class Meta:
        unique_together = ["actor", "target"]


class Library(models.Model):
    creation_date = models.DateTimeField(default=timezone.now)
    modification_date = models.DateTimeField(auto_now=True)
    fetched_date = models.DateTimeField(null=True, blank=True)
    actor = models.OneToOneField(
        Actor, on_delete=models.CASCADE, related_name="library"
    )
    uuid = models.UUIDField(default=uuid.uuid4)
    url = models.URLField(max_length=500)

    # use this flag to disable federation with a library
    federation_enabled = models.BooleanField()
    # should we mirror files locally or hotlink them?
    download_files = models.BooleanField()
    # should we automatically import new files from this library?
    autoimport = models.BooleanField()
    tracks_count = models.PositiveIntegerField(null=True, blank=True)
    follow = models.OneToOneField(
        Follow, related_name="library", null=True, blank=True, on_delete=models.SET_NULL
    )


get_file_path = common_utils.ChunkedPath("federation_cache")


class LibraryTrack(models.Model):
    url = models.URLField(unique=True, max_length=500)
    audio_url = models.URLField(max_length=500)
    audio_mimetype = models.CharField(max_length=200)
    audio_file = models.FileField(upload_to=get_file_path, null=True, blank=True)

    creation_date = models.DateTimeField(default=timezone.now)
    modification_date = models.DateTimeField(auto_now=True)
    fetched_date = models.DateTimeField(null=True, blank=True)
    published_date = models.DateTimeField(null=True, blank=True)
    library = models.ForeignKey(
        Library, related_name="tracks", on_delete=models.CASCADE
    )
    artist_name = models.CharField(max_length=500)
    album_title = models.CharField(max_length=500)
    title = models.CharField(max_length=500)
    metadata = JSONField(
        default=empty_dict, max_length=10000, encoder=DjangoJSONEncoder
    )

    @property
    def mbid(self):
        try:
            return self.metadata["recording"]["musicbrainz_id"]
        except KeyError:
            pass

    def download_audio(self):
        from . import actors

        auth = actors.SYSTEM_ACTORS["library"].get_request_auth()
        remote_response = session.get_session().get(
            self.audio_url,
            auth=auth,
            stream=True,
            timeout=20,
            verify=settings.EXTERNAL_REQUESTS_VERIFY_SSL,
            headers={"Content-Type": "application/activity+json"},
        )
        with remote_response as r:
            remote_response.raise_for_status()
            extension = music_utils.get_ext_from_type(self.audio_mimetype)
            title = " - ".join([self.title, self.album_title, self.artist_name])
            filename = "{}.{}".format(title, extension)
            tmp_file = tempfile.TemporaryFile()
            for chunk in r.iter_content(chunk_size=512):
                tmp_file.write(chunk)
            self.audio_file.save(filename, tmp_file)

    def get_metadata(self, key):
        return self.metadata.get(key)