from annoying.functions import get_object_or_None

from django.contrib.auth.models import User
from django.conf import settings
from django.db import models

from taggit.managers import TaggableManager
from taggit.utils import edit_string_for_tags

from markdown_deux import markdown
from pygments import highlight
from pygments.lexers import get_lexer_by_name
from pygments.util import ClassNotFound
from pygments.formatters import HtmlFormatter

from snipts.utils import slugify_uniquely

import datetime, hashlib, random, re


class Snipt(models.Model):
    """An individual Snipt."""

    user         = models.ForeignKey(User, blank=True, null=True)

    title        = models.CharField(max_length=255, blank=True, null=True, default='Untitled')
    slug         = models.SlugField(max_length=255, blank=True)
    custom_slug  = models.SlugField(max_length=255, blank=True)
    tags         = TaggableManager()

    lexer        = models.CharField(max_length=50)
    code         = models.TextField()
    description  = models.TextField(blank=True, null=True)
    stylized     = models.TextField(blank=True, null=True)
    stylized_min = models.TextField(blank=True, null=True)
    embedded     = models.TextField(blank=True, null=True)
    line_count   = models.IntegerField(blank=True, null=True, default=None)

    key          = models.CharField(max_length=100, blank=True, null=True)
    public       = models.BooleanField(default=False)
    blog_post    = models.BooleanField(default=False)

    views        = models.IntegerField(default=0)
    
    created      = models.DateTimeField(auto_now_add=True, editable=False)
    modified     = models.DateTimeField(auto_now=True, editable=False)
    publish_date = models.DateTimeField(blank=True, null=True)

    def save(self, *args, **kwargs):

        if not self.slug:
            self.slug = slugify_uniquely(self.title, Snipt)

        if not self.key:
            self.key = hashlib.md5(self.slug + str(datetime.datetime.now()) + str(random.random())).hexdigest()

        if self.lexer == 'markdown':
            self.stylized = markdown(self.code, 'default')

            # Snipt embeds
            for match in re.findall('\[\[(\w{32})\]\]', self.stylized):
                self.stylized = self.stylized.replace('[[' + str(match) + ']]',
                    '<script type="text/javascript" src="https://snipt.net/embed/{}/?snipt"></script><div id="snipt-embed-{}"></div>'.format(match, match))

            # YouTube embeds
            for match in re.findall('\[\[youtube-(\w{11})\-(\d+)x(\d+)\]\]', self.stylized):
                self.stylized = self.stylized.replace('[[youtube-{}-{}x{}]]'.format(str(match[0]), str(match[1]), str(match[2])),
                    '<iframe width="{}" height="{}" src="https://www.youtube.com/embed/{}" frameborder="0" allowfullscreen></iframe>'.format(match[1], match[2], match[0]))

            # Vimeo embeds
            for match in re.findall('\[\[vimeo-(\d+)\-(\d+)x(\d+)\]\]', self.stylized):
                self.stylized = self.stylized.replace('[[vimeo-{}-{}x{}]]'.format(str(match[0]), str(match[1]), str(match[2])),
                    '<iframe src="https://player.vimeo.com/video/{}" width="{}" height="{}" frameborder="0" webkitAllowFullScreen mozallowfullscreen allowFullScreen></iframe>'.format(match[0], match[1], match[2]))

            # Tweet embeds
            for match in re.findall('\[\[tweet-(\d+)\]\]', self.stylized):
                self.stylized = self.stylized.replace('[[tweet-{}]]'.format(str(match)), '<div class="embedded-tweet" data-tweet-id="{}"></div>'.format(str(match)))

            # Parse Snipt usernames
            for match in re.findall('@(\w+) ', self.stylized):

                # Try and get the Snipt user by username.
                user = get_object_or_None(User, username=match)

                if user:
                    url = user.profile.get_user_profile_url()
                    self.stylized = self.stylized.replace('@{} '.format(str(match)), '<a href="{}">@{}</a> '.format(url, match))

        else:
            self.stylized = highlight(self.code,
                                      get_lexer_by_name(self.lexer, encoding='UTF-8'),
                                      HtmlFormatter(linenos='table',
                                          anchorlinenos=True,
                                          lineanchors='L',
                                          linespans='L',
                                      )
                                  )
        self.line_count = len(self.code.split('\n'))

        if self.lexer == 'markdown':
            lexer_for_embedded = 'text'
        else:
            lexer_for_embedded = self.lexer

        embedded = highlight(self.code,
                             get_lexer_by_name(lexer_for_embedded, encoding='UTF-8'),
                             HtmlFormatter(
                                 style='native',
                                 noclasses=True,
                                 prestyles="""
                                     background-color: #1C1C1C;
                                     border-radius: 5px;
                                     color: #D0D0D0;
                                     display: block;
                                     font: 11px Monaco, monospace;
                                     margin: 0;
                                     overflow: auto;
                                     padding: 15px;
                                     -webkit-border-radius: 5px;
                                     -moz-border-radius: 5px;
                                     """))
        embedded = (embedded.replace("\\\"","\\\\\"")
                            .replace('\'','\\\'')
                            .replace("\\", "\\\\")
                            .replace('background: #202020', ''))
        self.embedded = embedded

        return super(Snipt, self).save(*args, **kwargs)

    def __unicode__(self):
        return self.title

    def favs(self):
        return Favorite.objects.filter(snipt=self).count()

    def get_stylized_min(self):
        if self.stylized_min is None:
            if self.lexer == 'markdown':
                self.stylized_min = markdown(self.code[:1000], 'default')
            else:
                self.stylized_min = highlight(self.code[:1000],
                                          get_lexer_by_name(self.lexer, encoding='UTF-8'),
                                          HtmlFormatter(linenos='table', linenospecial=1, lineanchors='line'))
        return self.stylized_min

    def get_absolute_url(self):

        if self.blog_post:
            if self.user.profile.blog_domain:
                return u'http://{}/{}/'.format(self.user.profile.blog_domain.split(' ')[0], self.slug)
            else:
                return u'https://{}.snipt.net/{}/'.format(self.user.username.replace('_', '-'), self.slug)

        if self.custom_slug:
            return u'/{}/'.format(self.custom_slug)

        if self.public:
            return u'/{}/{}/'.format(self.user.username, self.slug)
        else:
            return u'/{}/{}/?key={}'.format(self.user.username, self.slug, self.key)

    def get_full_absolute_url(self):

        if self.blog_post:
            if self.user.profile.blog_domain:
                return u'http://{}/{}/'.format(self.user.profile.blog_domain.split(' ')[0], self.slug)
            else:
                return u'https://{}.snipt.net/{}/'.format(self.user.username, self.slug)

        if settings.DEBUG:
            root = 'http://local.snipt.net'
        else:
            root = 'https://snipt.net'

        if self.public:
            return u'{}/{}/{}/'.format(root, self.user.username, self.slug)
        else:
            return u'{}/{}/{}/?key={}'.format(root, self.user.username, self.slug, self.key)

    def get_download_url(self):

        try:
            lexer_obj = get_lexer_by_name(self.lexer)
        except ClassNotFound:
            lexer_obj = None

        if lexer_obj and lexer_obj.filenames:
            filename = lexer_obj.filenames[0].replace('*', self.slug)
        else:
            if self.lexer == 'markdown':
                filename = u'{}.md'.format(self.slug)
            else:
                filename = u'{}.txt'.format(self.slug)

        if settings.DEBUG:
            root = 'http://local.snipt.net'
        else:
            root = 'https://snipt.net'

        return u'{}/download/{}/{}'.format(root, self.key, filename)

    def get_embed_url(self):

        if settings.DEBUG:
            root = 'http://local.snipt.net'
        else:
            root = 'https://snipt.net'

        return '{}/embed/{}/'.format(root, self.key)

    def get_raw_url(self):

        if settings.DEBUG:
            root = 'http://local.snipt.net'
        else:
            root = 'https://snipt.net'

        return '{}/raw/{}/'.format(root, self.key)

    @property
    def sorted_tags(self):
        return self.tags.all().order_by('name')

    @property
    def tags_list(self):
        return edit_string_for_tags(self.tags.all())

    @property
    def lexer_name(self):
        if self.lexer == 'markdown':
            return 'Markdown'
        else:
            return get_lexer_by_name(self.lexer).name

class Favorite(models.Model):
    snipt = models.ForeignKey(Snipt)
    user  = models.ForeignKey(User)

    created  = models.DateTimeField(auto_now_add=True, editable=False)
    modified = models.DateTimeField(auto_now=True, editable=False)
    
    def __unicode__(self):
        return u'{} favorited by {}'.format(self.snipt.title, self.user.username)