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

from django.core.exceptions import ValidationError 
from django.contrib.gis.db import models
from django.contrib.sitemaps import Sitemap
from django.utils.encoding import force_text
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.utils.text import slugify
from django.conf import settings
from django import forms

from taggit.managers import TaggableManager

from resizeimage.imageexceptions import ImageSizeError

from .utils import resize_image
from .readexif import readexif
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.db.models.signals import m2m_changed


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)

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

    class Meta:
        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)
    location = models.ForeignKey("locations.Location", on_delete=models.CASCADE, null=True, blank=True)
    is_public = models.BooleanField(default=True)
    sizes = models.ManyToManyField(LuxImageSize, blank=True)
    flickr_id = models.CharField(null=True, blank=True, max_length=80)
    twitter_link = models.CharField(null=True, blank=True, max_length=300)
    facebook_link = 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_by_size(size.name)

    def get_admin_insert(self):
        return "/media/images/%s/%s_tn.%s" % (self.pub_date.strftime("%Y"), self.get_image_name(), self.get_image_ext())

    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])

    def get_image_name(self):
        return self.image.url.split("original/")[1][5:-4]

    def get_image_ext(self):
        return self.image.url[-3:]

    @cached_property
    def get_featured_jrnl(self):
        ''' cached version of getting the primary image for archive page'''
        return "%s%s/%s_%s.%s" % (settings.IMAGES_URL, self.pub_date.strftime("%Y"), self.get_image_name(), 'featured_jrnl', self.get_image_ext())

    @cached_property
    def get_picwide_sm(self):
        ''' cached version of getting the second image for archive page'''
        return "%s%s/%s_%s.%s" % (settings.IMAGES_URL, self.pub_date.strftime("%Y"), self.get_image_name(), 'picwide-sm', self.get_image_ext())

    @cached_property
    def get_srcset(self):
        srcset = ""
        for size in self.sizes.all():
            srcset += "%s%s/%s_%s.%s %sw, " % (settings.IMAGES_URL, self.pub_date.strftime("%Y"), self.get_image_name(), size.name, self.get_image_ext(), size.width)
        return srcset

    @cached_property
    def get_src(self):
        src = ""
        if self.sizes.all().count() > 1:
            src += "%s%s/%s_%s.%s" % (settings.IMAGES_URL, self.pub_date.strftime("%Y"), self.get_image_name(), 'picwide-med', self.get_image_ext())
        else:
            src += "%s%s/%s_%s.%s" % (settings.IMAGES_URL, self.pub_date.strftime("%Y"), self.get_image_name(), [size.name for size in self.sizes.all()], self.get_image_ext())
        return src

    def get_image_by_size(self, size="original"):
        base = self.get_image_name()
        if size == "admin_insert":
            return "images/%s/%s.%s" % (self.pub_date.strftime("%Y"), base, self.get_image_ext())
        if size == "original":
            return "%soriginal/%s/%s.%s" % (settings.IMAGES_URL, self.pub_date.strftime("%Y"), base, self.get_image_ext())
        else:
            if size != 'tn':
                s = LuxImageSize.objects.get(name=size)
                if s not in self.sizes.all():
                    print("new size is "+s.name)
                    self.sizes.add(s)
            return "%s%s/%s_%s.%s" % (settings.IMAGES_URL, self.pub_date.strftime("%Y"), base, size, self.get_image_ext())

    def get_image_path_by_size(self, size="original"):
        base = self.get_image_name()
        if size == "original":
            return "%s/original/%s/%s.%s" % (settings.IMAGES_ROOT, self.pub_date.strftime("%Y"), base, self.get_image_ext())
        else:
            return "%s/%s/%s_%s.%s" % (settings.IMAGES_ROOT, self.pub_date.strftime("%Y"), base, size, self.get_image_ext())

    def get_thumbnail_url(self):
        return self.get_image_by_size("tn")

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

    def get_sizes(self):
        return self.sizes.all()

    @property
    def latitude(self):
        return self.point.y

    @property
    def longitude(self):
        return self.point.x

    @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):
        if not self.point:
            self.point = LuxImage.objects.latest().point
        try:
            self.location = apps.get_model('locations', 'Location').objects.filter(
                geometry__contains=self.point
            ).get()
        except apps.get_model('locations', 'Location').DoesNotExist:
            raise forms.ValidationError("There is no location associated with that point, add it:  %sadmin/locations/location/add/" % (settings.BASE_URL))
        super(LuxImage, self).save()


@receiver(post_save, sender=LuxImage)
def post_save_events(sender, update_fields, created, instance, **kwargs):
    if instance.exif_raw == '':
        filename, file_extension = os.path.splitext(instance.image.path)
        if file_extension != ".mp4":
            img = Image.open(instance.image.path)
            instance.height = img.height
            instance.width = img.width
            #instance = readexif(instance)
            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):
    base_path = "%s/%s/" % (settings.IMAGES_ROOT, instance.pub_date.strftime("%Y"))
    filename, file_extension = os.path.splitext(instance.image.path)
    if file_extension != ".mp4":
        img = Image.open(instance.image.path)
        resize_image(img, 160, None, 78, base_path, "%s_tn.%s" % (instance.get_image_name(), instance.get_image_ext()))
        for size in instance.sizes.all():
            if size.width:
                print("Image width is:"+str(img.width))
                try:
                    if size.width <= img.width:
                        resize_image(img, size.width, None, size.quality, base_path, "%s_%s.%s" % (instance.get_image_name(), slugify(size.name), instance.get_image_ext()))
                    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(size)
                    m2m_changed.connect(update_photo_sizes, sender=LuxImage.sizes.through)
            if size.height:
                try:
                    if size.height <= img.height:
                        resize_image(img, None, size.height, size.quality, base_path, "%s_%s.%s" % (instance.get_image_name(), slugify(size.name), instance.get_image_ext()))

                    else:
                        pass
                except ImageSizeError:
                    m2m_changed.disconnect(update_photo_sizes, sender=LuxImage.sizes.through)
                    instance.sizes.remove(size)
                    m2m_changed.connect(update_photo_sizes, sender=LuxImage.sizes.through)


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)
    point = models.PointField(null=True, blank=True)
    location = models.ForeignKey("locations.Location", on_delete=models.CASCADE, null=True, blank=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 latitude(self):
        if self.point:
            return self.point.y

    def longitude(self):
        if self.point:
            return self.point.x

    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'
        get_latest_by = 'pub_date'

class Photo(models.Model):
    description = models.TextField(blank=True, null=True)
    title = models.CharField(blank=True, max_length=300)
    pub_date = models.DateTimeField()
    tags = TaggableManager(blank=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()
    """Flickr Specific Stuff"""
    # Vlickr id is varchar since Flickr ids are larger than than integerfield can handle and BigIntegerField gets weird in Postgres.
    flickr_id = models.CharField(max_length=300)
    flickr_owner = models.CharField(max_length=20)
    flickr_server = models.IntegerField()
    flickr_farm = models.IntegerField()
    flickr_secret = models.CharField(max_length=50)
    flickr_originalsecret = models.CharField(max_length=50)
    lon = models.FloatField('Longitude', help_text="Longitude of centerpoint", null=True)
    lat = models.FloatField('Latitude', help_text="Latitude of centerpoint", null=True)
    location = models.ForeignKey("locations.Location", on_delete=models.CASCADE, null=True)
    region = models.ForeignKey("locations.Region", on_delete=models.CASCADE, null=True)
    slideshowimage_width = models.CharField(max_length=4, blank=True, null=True)
    slideshowimage_height = models.CharField(max_length=4, blank=True, null=True)
    slideshowimage_margintop = models.CharField(max_length=4, blank=True, null=True)
    slideshowimage_marginleft = models.CharField(max_length=4, blank=True, null=True)
    is_public = models.BooleanField(default=True)

    class Meta:
        ordering = ('-pub_date',)

    def admin_thumbnail(self):
        return force_text('<a href="%s"><img src="%s"></a>' % (self.get_absolute_url(), self.get_small_square_url()))
    admin_thumbnail.allow_tags = True
    admin_thumbnail.short_description = 'Thumbnail'

    def get_local_medium_url(self):
        return '%sflickr/med/%s/%s.jpg' % (settings.IMAGES_URL, self.pub_date.strftime("%Y"), self.flickr_id)

    def get_local_orig_url(self):
        return '%s/flickr/full/%s/%s.jpg' % (settings.IMAGES_ROOT, self.pub_date.strftime("%Y"), self.flickr_id)

    def get_local_slideshow_url(self):
        return '%sslideshow/%s/%s.jpg' % (settings.IMAGES_URL, self.pub_date.strftime("%Y"), self.flickr_id)

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return "/photo/%s/" % (self.id)

    def get_model_name(self):
        return 'photo'

    def get_small_square_url(self):
        return self.get_pic_url(size="small_square")

    def get_large_url(self):
        return self.get_pic_url(size="large")

    def get_small_url(self):
        return self.get_pic_url(size="small")

    def get_medium_url(self):
        return self.get_pic_url(size="medium")

    def get_original_url(self):
        # return self.get_pic_url(size="original")
        return "http://farm%s.static.flickr.com/%s/%s_%s_o.jpg" % (self.flickr_farm, self.flickr_server, self.flickr_id, self.flickr_originalsecret)

    def get_retina_slideshow_url(self):
        return '%sslideshow/%s/%sx2.jpg' % (settings.IMAGES_URL, self.pub_date.strftime("%Y"), self.flickr_id)

    def has_retina(self):
        return os.path.isfile('%s/slideshow/%s/%sx2.jpg' % (settings.IMAGES_ROOT, self.pub_date.strftime("%Y"), self.flickr_id))

    @property
    def get_height(self):
        im = Image.open('%s/slideshow/%s/%s.jpg' % (settings.IMAGES_ROOT,
                        self.pub_date.strftime("%Y"), self.flickr_id))
        xsize, ysize = im.size
        return ysize

    @property
    def get_width(self):
        im = Image.open('%s/slideshow/%s/%s.jpg' % (settings.IMAGES_ROOT,
                        self.pub_date.strftime("%Y"), self.flickr_id))
        xsize, ysize = im.size
        return xsize

    @property
    def get_margin_top(self):
        im = Image.open('%s/slideshow/%s/%s.jpg' % (settings.IMAGES_ROOT,
                        self.pub_date.strftime("%Y"), self.flickr_id))
        xsize, ysize = im.size
        mtop = 340 - (ysize / 2)
        return mtop

    @property
    def get_margin_left(self):
        im = Image.open('%s/slideshow/%s/%s.jpg' % (settings.IMAGES_ROOT,
                        self.pub_date.strftime("%Y"), self.flickr_id))
        xsize, ysize = im.size
        mtop = 500 - (xsize / 2)
        return mtop

    @property
    def flickr_link(self):
        return '%s%s/' % ('http://www.flickr.com/photos/luxagraf/', self.flickr_id)

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

    def get_pic_url(self, size='small'):
        # small_square=75x75
        # thumb=100 on longest side
        # small=240 on longest side
        # medium=500 on longest side
        # large=1024 on longest side
        # original=duh
        base_url = "http://static.flickr.com"
        size_char = 's'  # default to small_square
        if size == 'small_square':
            size_char = '_s'
        elif size == 'thumb':
            size_char = '_t'
        elif size == 'small':
            size_char = '_m'
        elif size == 'medium':
            size_char = ''
        elif size == 'large':
            size_char = '_b'
        elif size == 'original':
            size_char = '_o'

        return "http://farm%s.static.flickr.com/%s/%s_%s%s.jpg" % (self.flickr_farm, self.flickr_server, self.flickr_id, self.flickr_secret, size_char)

    def get_tumble_image(self):
        return "%s/crops/%s/%s.jpg" % (settings.IMAGES_URL, self.pub_date.strftime("%Y/%b").lower(), self.id)

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

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

    def comment_period_open(self):
        return self.enable_comments and datetime.datetime.today() - datetime.timedelta(30) <= self.pub_date

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


class PhotoGallery(models.Model):
    set_id = models.CharField(blank=True, max_length=300)
    set_title = models.CharField(blank=True, max_length=300)
    set_desc = models.TextField(blank=True, null=True)
    set_slug = models.CharField(blank=True, max_length=300)
    primary = models.CharField(blank=True, max_length=300)
    photos = models.ManyToManyField(Photo)
    location = models.ForeignKey("locations.Location", on_delete=models.CASCADE, null=True)
    region = models.ForeignKey("locations.Region", on_delete=models.CASCADE, null=True)
    pub_date = models.DateTimeField(null=True)

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

    def __str__(self):
        return self.set_title

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

    def get_absolute_url(self):
        return "/photos/galleries/%s/" % (self.set_slug)


class PhotoGallerySitemap(Sitemap):
    changefreq = "never"
    priority = 0.7
    protocol = "https"

    def items(self):
        return PhotoGallery.objects.all()

    def lastmod(self, obj):
        return obj.pub_date


def resize_luximage(self, image):
    image.save()
    img = Image.open(image.image.path)
    base_path = "%s/galleries/" % settings.IMAGES_ROOT
    if img.size[0] > img.size[1]:
        resize_image(img, 2280, None, 65, base_path+'large/', image.get_image_name())
        resize_image(img, 1140, None, 72, base_path+'medium/', image.get_image_name())
        resize_image(img, 720, None, 68, base_path+'small/', image.get_image_name())
    if img.size[1] > img.size[0]:
        resize_image(img, None, 1600, 65, base_path+'large/', image.get_image_name())
        resize_image(img, None, 800, 72, base_path+'medium/', image.get_image_name())
        resize_image(img, None, 460, 60, base_path+'small/', image.get_image_name())

    resize_image(img, 160, None, 68, base_path+'thumb/', image.get_image_name())