import os.path
import io
import datetime
from pathlib import Path
from PIL import Image

from django.core.exceptions import ValidationError 
from django.core.files import File
from django.contrib.gis.db import models
from django.contrib.sitemaps import Sitemap
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.db.models.signals import m2m_changed
from django.utils.functional import cached_property
from django.urls import reverse
from django.apps import apps
from django.utils.html import format_html
from django.conf import settings
from django import forms

from resizeimage.imageexceptions import ImageSizeError

from taggit.managers import TaggableManager

from .readexif import readexif
from .utils import resize_image


def add_mp4(filepath, luxvideo):
    full_filepath = "/home/lxf/sites/django/luxagraf.net/"+filepath
    v = open(full_filepath, "rb")
    django_file = File(v)
    video = LuxVideo.objects.get(title=luxvideo)
    video.video_mp4.save(filepath, django_file, save=True)


def add_webm(filepath, luxvideo):
    full_filepath = "/home/lxf/sites/django/luxagraf.net/"+filepath
    v = open(full_filepath, "rb")
    django_file = File(v)
    video = LuxVideo.objects.get(title=luxvideo)
    video.video_webm.save(filepath, django_file, save=True)


def get_upload_path(self, filename):
    return "images/original/%s/%s" % (datetime.datetime.today().strftime("%Y"), filename)


def get_vid_upload_path(self, filename):
    return "images/videos/%s/%s" % (datetime.datetime.today().strftime("%Y"), filename)


def get_audio_upload_path(self, filename):
    return "audio/%s/%s" % (datetime.datetime.today().strftime("%Y"), filename)


class LuxImageSize(models.Model):
    name = models.CharField(null=True, blank=True, max_length=30)
    slug = models.SlugField(null=True, blank=True)
    width = models.IntegerField(null=True, blank=True)
    height = models.IntegerField(null=True, blank=True)
    quality = models.IntegerField()

    class Meta:
        ordering = ('-name', 'id')
        verbose_name_plural = 'Image Sizes'

    def __str__(self):
        if self.width:
            size = self.width
        if self.height:
            size = self.height
        return "%s - %s" %(self.name, str(size))


class LuxImage(models.Model):
    image = models.FileField(blank=True, null=True, upload_to=get_upload_path)
    title = models.CharField(null=True, blank=True, max_length=300)
    alt = models.CharField(null=True, blank=True, max_length=300)
    photo_credit_source = models.CharField(null=True, blank=True, max_length=300)
    photo_credit_url = models.CharField(null=True, blank=True, max_length=300)
    caption = models.TextField(blank=True, null=True)
    pub_date = models.DateTimeField(default=datetime.datetime.now)
    exif_raw = models.TextField(blank=True, null=True)
    exif_aperture = models.CharField(max_length=50, blank=True, null=True)
    exif_make = models.CharField(max_length=50, blank=True, null=True)
    exif_model = models.CharField(max_length=50, blank=True, null=True)
    exif_exposure = models.CharField(max_length=50, blank=True, null=True)
    exif_iso = models.CharField(max_length=50, blank=True, null=True)
    exif_focal_length = models.CharField(max_length=50, blank=True, null=True)
    exif_lens = models.CharField(max_length=50, blank=True, null=True)
    exif_date = models.DateTimeField(blank=True, null=True)
    height = models.CharField(max_length=6, blank=True, null=True)
    width = models.CharField(max_length=6, blank=True, null=True)
    point = models.PointField(null=True, blank=True)
    is_public = models.BooleanField(default=True)
    sizes = models.ManyToManyField(LuxImageSize, blank=True, related_name='sizes')
    sizes_cache = models.CharField(null=True, blank=True, max_length=300)

    class Meta:
        ordering = ('-pub_date', 'id')
        verbose_name_plural = 'Images'
        get_latest_by = 'pub_date'

    def __str__(self):
        if self.title:
            return "%s" % self.title
        else:
            return "%s" % self.pk

    def get_type(self):
        return str(self.__class__.__name__)

    def get_admin_image(self):
        for size in self.sizes.all():
            if size.width and size.width <= 820 or size.height and size.height <= 800:
                return self.get_image_url_by_size(size.name)

    def get_largest_image(self):
        t = []
        for size in self.sizes.all():
            t.append(size.width)
        t.sort(key=float)
        t.reverse()
        return self.get_image_path_by_size(t[0])

    @cached_property
    def image_name(self):
        return os.path.basename(self.image.path)[:-4]

    @cached_property
    def image_ext(self):
        return self.image.url[-3:]

    @cached_property
    def get_image_filename(self):
        return os.path.basename(self.image.path)

    @property
    def get_srcset(self):
        srcset = ""
        length = len(self.sizes.all())
        print(length)
        loopnum = 1
        for size in self.sizes.all():
            srcset += "%s%s/%s_%s.%s %sw" % (settings.IMAGES_URL, self.pub_date.strftime("%Y"), self.image_name, size.slug, self.image_ext, size.width)
            if loopnum < length:
                srcset += ", "
                loopnum = loopnum+1
        return srcset

    @property
    def get_src(self):
        src = ""
        if self.sizes.all().count() > 1:
            src = self.get_image_url_by_size('picwide-med')
        else:
            size = "".join(size.name for size in self.sizes.all())
            src = self.get_image_url_by_size(size)
        return src

    def get_image_url_by_size(self, size="original"):
        if size == "original":
            return "%soriginal/%s/%s.%s" % (settings.IMAGES_URL, self.pub_date.strftime("%Y"), self.image_name, self.image_ext)
        if size == "admin_insert":
            return "images/%s/%s.%s" % (self.pub_date.strftime("%Y"), self.image_name, self.image_ext)
        else:
            luximagesize = LuxImageSize.objects.get(slug=size)
            #if luximagesize not in self.get_sizes:
                #self.sizes.add(luximagesize)
            return "%s%s/%s_%s.%s" % (settings.IMAGES_URL, self.pub_date.strftime("%Y"), self.image_name, luximagesize.slug, self.image_ext)

    def get_image_path_by_size(self, size="original"):
        if size == "original":
            return self.image.path
        else:
            luximagesize = LuxImageSize.objects.get(slug=size)
            return "%s/%s/%s_%s.%s" % (settings.IMAGES_ROOT, self.pub_date.strftime("%Y"), self.image_name, luximagesize.slug, self.image_ext)

    @cached_property
    def get_thumbnail_url(self):
        return self.get_image_url_by_size("tn")

    def admin_thumbnail(self):
        return format_html('<a href="%s"><img src="%s"></a>' % (self.get_image_url_by_size(), self.get_image_url_by_size("tn")))
    admin_thumbnail.short_description = 'Thumbnail'

    @property
    def get_sizes(self):
        return self.sizes_cache.split(",")

    @property
    def get_previous_published(self):
        return self.get_previous_by_pub_date()

    @property
    def get_next_published(self):
        return self.get_next_by_pub_date()

    @property
    def get_previous_admin_url(self):
        n = self.get_previous_by_pub_date()
        return reverse('admin:%s_%s_change' %(self._meta.app_label,  self._meta.model_name),  args=[n.id] )

    @property
    def get_next_admin_url(self):
        model = apps.get_model(app_label=self._meta.app_label, model_name=self._meta.model_name)
        try:
            return reverse('admin:%s_%s_change' %(self._meta.app_label,  self._meta.model_name),  args=[self.get_next_by_pub_date().pk] )
        except model.DoesNotExist:
            return ''

    @property
    def is_portait(self):
        if int(self.height) > int(self.width):
            return True
        else:
            return False 

    def save(self, *args, **kwargs):
        created = self.pk is None
        if not created:
            self.sizes_cache = ",".join(s.slug for s in self.sizes.all())
        super(LuxImage, self).save()


class LuxGallery(models.Model):
    title = models.CharField(blank=True, max_length=300)
    description = models.TextField(blank=True, null=True)
    slug = models.CharField(blank=True, max_length=300)
    thumb = models.ForeignKey(LuxImage, on_delete=models.CASCADE, related_name="gallery_thumb", null=True, blank=True)
    images = models.ManyToManyField(LuxImage)
    pub_date = models.DateTimeField(null=True)
    is_public = models.BooleanField(default=True)
    caption_style = models.CharField(blank=True, null=True, max_length=400)

    class Meta:
        ordering = ('-pub_date', 'id')
        verbose_name_plural = 'Galleries'
        get_latest_by = 'pub_date'

    def __str__(self):
        return self.title

    def get_main_image(self):
        return "%sgallery_thumbs/%s.jpg" % (settings.IMAGES_URL, self.id)

    def get_absolute_url(self):
        if self.is_public:
            return "/photos/galleries/%s" % (self.slug)
        else:
            return "/photos/galleries/private/%s" % (self.slug)

    def thumbs(self):
        lst = [x.image.name for x in self.images.all()]
        lst = ["<a href='/media/%s'>%s</a>" % (x, x.split('/')[-1]) for x in lst]
        return ', '.join(item for item in lst if item)
    thumbs.allow_tags = True


class LuxVideo(models.Model):
    video_mp4 = models.FileField(blank=True, null=True, upload_to=get_vid_upload_path)
    video_webm = models.FileField(blank=True, null=True, upload_to=get_vid_upload_path)
    video_poster = models.FileField(blank=True, null=True, upload_to=get_vid_upload_path)
    title = models.CharField(null=True, blank=True, max_length=300)
    pub_date = models.DateTimeField(default=datetime.datetime.now)
    youtube_url = models.CharField(null=True, blank=True, max_length=80)
    vimeo_url = models.CharField(null=True, blank=True, max_length=300)

    def __str__(self):
        if self.title:
            return self.title
        else:
            return str(self.pk)

    def get_type(self):
        return str(self.__class__.__name__)

    class Meta:
        ordering = ('-pub_date', 'id')
        verbose_name_plural = 'Videos'
        verbose_name = 'Video'
        get_latest_by = 'pub_date'

    def save(self, *args, **kwargs):
        super(LuxVideo, self).save(*args, **kwargs)


class LuxAudio(models.Model):
    title = models.CharField(max_length=200)
    subtitle = models.CharField(max_length=200, blank=True)
    slug = models.SlugField(unique_for_date='pub_date', blank=True)
    body_html = models.TextField(blank=True)
    body_markdown = models.TextField(blank=True)
    pub_date = models.DateTimeField(default=datetime.datetime.now)
    mp3 = models.FileField(blank=True, null=True, upload_to=get_audio_upload_path)
    ogg = models.FileField(blank=True, null=True, upload_to=get_audio_upload_path)
    point = models.PointField(blank=True, null=True)

    class Meta:
        ordering = ('-pub_date',)
        verbose_name_plural = 'Audio'
        verbose_name = 'Audio'
        get_latest_by = 'pub_date'

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse("prompt:detail", kwargs={"slug": self.slug})

    def get_image_url_by_size(self, size="original"):
        pass

    @property
    def get_previous_published(self):
        return self.get_previous_by_pub_date(status__exact=1)

    @property
    def get_previous_admin_url(self):
        n = self.get_previous_by_pub_date()
        return reverse('admin:%s_%s_change' % (self._meta.app_label,  self._meta.model_name),  args=[n.id])

    @property
    def get_next_published(self):
        return self.get_next_by_pub_date(status__exact=1)

    @property
    def get_next_admin_url(self):
        model = apps.get_model(app_label=self._meta.app_label, model_name=self._meta.model_name)
        try:
            return reverse('admin:%s_%s_change' % (self._meta.app_label,  self._meta.model_name),  args=[self.get_next_by_pub_date().pk])
        except model.DoesNotExist:
            return ''

    def get_type(self):
        return str(self.__class__.__name__)

    def save(self, *args, **kwargs):
        md = render_images(self.body_markdown)
        self.body_html = markdown_to_html(md)
        if not self.point:
            self.point = CheckIn.objects.latest().point
        super(LuxAudio, self).save(*args, **kwargs)


@receiver(post_save, sender=LuxImage)
def post_save_events(sender, update_fields, created, instance, **kwargs):
    if created:
        if instance.exif_raw == '':
            instance = readexif(instance)
        instance.sizes.add(LuxImageSize.objects.get(slug="tn"))
        img = Image.open(instance.image.path)
        instance.height = img.height
        instance.width = img.width
        post_save.disconnect(post_save_events, sender=LuxImage)
        instance.save()
        post_save.connect(post_save_events, sender=LuxImage)


@receiver(m2m_changed, sender=LuxImage.sizes.through)
def update_photo_sizes(sender, instance, **kwargs):
    # update the local cache of sizes
    sizes = instance.sizes.all()
    if sizes:
        instance.sizes_cache = ",".join(s.slug for s in sizes)
        instance.save()
        for size in instance.get_sizes:
            print("SIZE is: %s" % size)
            # check each size and see if there's an image there already
            my_file = Path(instance.get_image_path_by_size(size))
            if not my_file.is_file():
                #file doesn't exist, so create it
                new_size = LuxImageSize.objects.get(slug=size)
                if new_size.width:
                    img = Image.open(instance.image.path)
                    try:
                        if new_size.width <= img.width:
                            resize_image(img, new_size.width, None, new_size.quality, instance.get_image_path_by_size(size))
                        else:
                            raise ValidationError({'items': ["Size is larger than source image"]})
                    except ImageSizeError:
                        m2m_changed.disconnect(update_photo_sizes, sender=LuxImage.sizes.through)
                        instance.sizes.remove(new_size)
                        m2m_changed.connect(update_photo_sizes, sender=LuxImage.sizes.through)
                if new_size.height:
                    img = Image.open(instance.image.path)
                    try:
                        if new_size.height <= img.height:
                            resize_image(img, None, new_size.height, new_size.quality, instance.get_image_path_by_size(size))
                        else:
                            pass
                    except ImageSizeError:
                        m2m_changed.disconnect(update_photo_sizes, sender=LuxImage.sizes.through)
                        instance.sizes.remove(new_size)
                        m2m_changed.connect(update_photo_sizes, sender=LuxImage.sizes.through)
            else:
                # file exists, might add something here to force it to do the above when I want
                print("file %s exists" % size)
                pass


def generate_image(luximage, size):
    new_size = LuxImageSize.objects.get(slug=size)
    if new_size.width:
        img = Image.open(luximage.image.path)
        try:
            if new_size.width <= img.width:
                resize_image(img, new_size.width, None, new_size.quality, luximage.get_image_path_by_size(size))
            else:
                raise ValidationError({'items': ["Size is larger than source image"]})
        except ImageSizeError:
            print("error creating size")
    if new_size.height:
        img = Image.open(luximage.image.path)
        try:
            if new_size.height <= img.height:
                resize_image(img, None, new_size.height, new_size.quality, luximage.get_image_path_by_size(size))
            else:
                pass
        except ImageSizeError:
            print("error creating size")