from django.conf import settings

from django.db import models

from django.utils.translation import ugettext_lazy as _

from ldt.core.models import Document, Owner

from django.contrib.auth.models import User

import tagging.fields

from utils import create_ldt, copy_ldt, create_empty_iri, update_iri, generate_uuid

import lxml.etree

import os.path

import uuid

class Author(models.Model):

    handle = models.CharField(max_length=512, unique=True, blank=True, null=True)

    email = models.EmailField(unique=False, blank=True, null=True)

    firstname = models.CharField(max_length=512, blank=True, null=True)

    lastname = models.CharField(max_length=512, blank=True, null=True)

    def __unicode__(self):

        return unicode(self.id) + " - " + self.handle + ", " + self.email + ", " + self.firstname + " " + self.lastname

class Media(models.Model):

    external_id = models.CharField(max_length=1024, null=True, blank=True, verbose_name=_('media.external_id'))

    external_permalink = models.URLField(max_length=1024, null=True, blank=True, verbose_name=_('content.external_permalink'))

    external_publication_url = models.URLField(max_length=1024, null=True, blank=True, verbose_name=_('content.external_publication_url'))

    external_src_url = models.URLField(max_length=1024, null=True, blank=True, verbose_name=_('content.external_publication_url'))

    creation_date = models.DateTimeField(auto_now_add=True, verbose_name=_('media.creation_date'))

    media_creation_date = models.DateTimeField(null=True, blank=True, verbose_name=_('media.media_creation_date'))

    update_date = models.DateTimeField(auto_now=True, verbose_name=_('media.update_date'))

    videopath = models.CharField(max_length=1024, null=True, blank=True, verbose_name=_('media.videopath'))

    duration = models.IntegerField(null=True, blank=True, verbose_name=_('media.duration'))

    creator = models.ForeignKey(User, blank=True, null=True, verbose_name=_('media.creator'))

    description = models.TextField(null=True, blank=True, verbose_name=_('description'))

    title = models.CharField(max_length=1024, null=True, blank=True, verbose_name=_('title'))

    src = models.CharField(max_length=1024, unique=True, verbose_name=_('media.src'))

    def __unicode__(self):

        strings = []

        if self.title:

            strings.append(unicode(self.title))

        else:

            strings.append(unicode(self.src))

        if self.external_id:

            strings.append(unicode(self.external_id))

        return "|".join(strings)

class Content(models.Model):

    iri_id = models.CharField(max_length=1024, unique=True, default=generate_uuid, verbose_name=_('content.iri_id'))

    iriurl = models.CharField(max_length=1024, verbose_name=_('content.iriurl'))

#    src = models.CharField(max_length=1024, null=True, blank=True, verbose_name=_('content.src'))

#    videopath = models.CharField(max_length=1024, null=True, blank=True, verbose_name=_('content.videopath'))

    creation_date = models.DateTimeField(auto_now_add=True, verbose_name=_('content.creation_date'))

    update_date = models.DateTimeField(auto_now=True, verbose_name=_('content.update_date'))

    title = models.CharField(max_length=1024, null=True, blank=True, verbose_name=_('content.title'))

    description = models.TextField(null=True, blank=True, verbose_name=_('content.description'))

#    external_id = models.CharField(max_length=1024, null=True, blank=True, verbose_name=_('content.external_id'))

    authors = models.ManyToManyField(Author, blank=True, verbose_name=_('content.authors'))

    duration = models.IntegerField(null=True, blank=True, verbose_name=_('content.duration'))

    content_creation_date = models.DateTimeField(null=True, blank=True, verbose_name=_('content.content_creation_date'))

    tags = tagging.fields.TagField(max_length=2048, null=True, blank=True )

    media_obj = models.ForeignKey('Media', blank=True, null=True )

    def get_duration(self):

        if self.duration is None:

            doc = lxml.etree.parse(self.iri_file_path())

            res = doc.xpath("/iri/body/medias/media[@id='video']/video")

            self.duration = int(res[0].get(u'dur') or 0)

            self.save()

        return self.duration

    def delete(self):

        super(Content, self).delete()

        writer = lucene.IndexWriter(STORE, ANALYZER, True, lucene.IndexWriter.MaxFieldLength.UNLIMITED)

        writer.deleteDocuments(lucene.Term("iri_id", self.iri_id))

        writer.commit()

    #TODO: better manage the change in .iri name and error scenario (save in temp file + rename

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

        # create iri file if needed

        created = False

        try:

            iri_file_path = self.iri_file_path()

            if not os.path.exists(iri_file_path):

                dir = os.path.dirname(iri_file_path)

                if not os.path.exists(dir):

                    os.makedirs(dir)

                created = True

                file = open(iri_file_path,"w")

                create_empty_iri(file, self, "IRI")

            else:

                created = False

                update_iri(iri_file_path, self, "IRI")

        except Exception, e:

            if created:

                if os.path.exists(iri_file_path):

                    os.remove(iri_file_path)

            raise e

        # update it 

        super(Content, self).save(*args, **kwargs)

    def __unicode__(self):

        return str(self.id) + ": " + self.iri_id

    def iri_url(self, web_url=settings.WEB_URL):

        if 'http' in self.iriurl or 'https' in self.iriurl:

            return self.iriurl

        else:

            return unicode(web_url) + unicode(settings.MEDIA_URL)+u"media/ldt/"+unicode(self.iriurl)

    def iri_file_path(self):

        return os.path.join(os.path.join(os.path.join(os.path.join(settings.MEDIA_ROOT, "media"), "ldt"), self.iri_id), os.path.basename(self.iriurl))

    def iri_url_template(self):

        return "${web_url}${media_url}media/ldt/" + unicode(self.iri_id) + "/" + os.path.basename(self.iriurl)

    def __get_empty_media(self):

        if settings.EMPTY_MEDIA_EXTERNALID:

            empty_media = Media.objects.get(externalid=settings.EMPTY_MEDIA_EXTERNALID)

            return empty_media

        else:

            return None

    def videopath(): #@NoSelf

        doc = """simulate videopath""" #@UnusedVariable

        def fget(self):

            if self.media_obj is None:

                empty_media = self.__get_empty_media()

                if empty_media:

                    return empty_media.videopath

                else: 

                    return None

            else:

                return self.media_obj.videopath

        def fset(self, value):

            if self.media_obj is not None:

                self.media_obj.videopath = value

        return locals()

    videopath = property(**videopath())

    def src(): #@NoSelf

        doc = """simulate videopath""" #@UnusedVariable

        def fget(self):

            if self.media_obj is None:

                empty_media = self.__get_empty_media()

                if empty_media:

                    return empty_media.src

                else:

                    return None

            else:

                return self.media_obj.src

        def fset(self, value):

            if self.media_obj is None or self.media_obj.src != value:

                media, created = Media.objects.get_or_create(src=value, defaults={'src':value})                

                self.media_obj = media

                self.save()

        return locals()

    src = property(**src())

class Project(Document):  

    STATE_CHOICES=(

    (1, 'edition'),

    (2, 'published'),

    (3, 'moderated'),

    (4, 'rejected'),

    (5, 'deleted')

    )

    ldt_id = models.CharField(max_length=1024, unique=True)

    ldt = models.TextField(null=True)

    title = models.CharField(max_length=1024)

    contents = models.ManyToManyField(Content)

    creation_date = models.DateTimeField(auto_now_add=True)

    modification_date = models.DateTimeField(auto_now=True)

    created_by = models.CharField(_("created by"), max_length=70)

    changed_by = models.CharField(_("changed by"), max_length=70)

    state = models.IntegerField(choices=STATE_CHOICES, default=1)

    def __unicode__(self):

        return unicode(self.id) + u": " + unicode(self.ldt_id)

    def get_description(self, doc=None):

        if doc is None:

            doc = lxml.etree.fromstring(self.ldt)

        res = doc.xpath("/iri/project")

        if len(res) > 0:

            return res[0].get(u'abstract')

        else:

            return None

    @staticmethod

    def create_project(user, title, contents):

        owner = Owner.objects.get(user=user)

        project = Project(title=title, owner=owner)

        project.ldt_id = str(uuid.uuid1())

        project.created_by=user.username

        project.changed_by=user.username

        project.state = 1

        project.save()

        for content in contents:

            project.contents.add(content)

        project.save()

        return create_ldt(project, user)

    def copy_project(self, user, title):

        owner = Owner.objects.get(user=user)

        project = Project(title=title, owner=owner)

        project = copy_ldt(self, project, user)

        project.save()

        for content in self.contents.all():

            project.contents.add(content)

        project.save()

        return project

class Segment(models.Model):

    project_obj = models.ForeignKey(Project, null=True)

    content = models.ForeignKey(Content)

    project_id = models.CharField(max_length=1024, unique=False, blank=True, null=True)

    iri_id = models.CharField(max_length=1024, unique=False)

    ensemble_id = models.CharField(max_length=1024, unique=False)

    cutting_id = models.CharField(max_length=1024, unique=False)    

    element_id = models.CharField(max_length=1024, unique=False)

    tags = tagging.fields.TagField(max_length=2048, null=True, blank=True, unique=False)

    title = models.CharField(max_length=2048, unique=False, null=True, blank=True)

    duration = models.IntegerField(null=True)

    start_ts = models.IntegerField(null=True)

    author = models.CharField(max_length=1024, unique=False, null=True, blank=True)

    date = models.CharField(max_length=128, unique=False, null=True, blank=True)

    abstract = models.TextField(null=True, blank=True)

    def __unicode__(self):

        return "/".join((unicode(self.project_id), unicode(self.iri_id), unicode(self.ensemble_id), unicode(self.cutting_id), unicode(self.element_id)))

    class Meta:

        unique_together = (('project_id', 'iri_id', 'ensemble_id', 'cutting_id', 'element_id'),)