from django.conf import settings

from ldt.ldt_utils.models import Project

import lxml.etree

import uuid

DATE_FORMATS = ["%d/%m/%Y", "%Y-%m-%d"]

class SegmentSerializer(object):

    """

    Serialize a set of annotations to a cinelab compatible array

    """

    def __init__(self, content, segments, viewable_contents=[], default_color=2194379):

        """

        viewable_contents should contain all contents from project that a user is allowed to see. The settings.FORBIDDDEN_STREAM_URL

        will be displayed if a content is not found in viewable_contents, and the real stream will be displayed if it is. 

        """

        self.content = content

        self.segments = segments

        self.viewable_contents = viewable_contents

        self.default_color = default_color

        self.views = None

        self.annotation_types = None

        self.medias = None

        self.annotations = None 

        self.tags = {}

        self.xml_docs = {}

    def __get_cutting_title(self, project_id, content_id, ensemble_id, cutting_id):

        if not self.xml_docs.has_key(project_id):

            project = Project.objects.get(ldt_id=project_id)

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

            self.xml_docs[project_id] = doc

        else:

            doc = self.xml_docs[project_id]

        cutting = doc.xpath('/iri/annotations/content[@id=\'%s\']/ensemble[@id=\'%s\']/decoupage[@id=\'%s\']/title' % (content_id, ensemble_id, cutting_id))

        if not cutting:

            return None

        cutting = cutting[0]

        return cutting.text       

    def __parse_views(self):

        view = {

                "id": "0",

                "contents": [

                    self.content.iri_id

                ],

                "annotation_types": [ ],

        }

        stat = {

                "id": "stat",

                "contents": [

                    self.content.iri_id

                ],

                "meta": {

                }

        }

        self.annotation_types = []

        annotation_types = []        

        for seg in self.segments:

            title = self.__get_cutting_title(seg.project_id, seg.iri_id, seg.ensemble_id, seg.cutting_id)

            annotation_types.append({'id': seg.cutting_id, 'title': title})

        for a in annotation_types:

            view['annotation_types'].append(a['id'])

            self.annotation_types.append({

                    "dc:contributor": "undefined",

                    "dc:creator": "undefined",

                    "dc:title": a['title'],

                    "id": a['id'],

                    "dc:created": "",

                    "dc:description": "",

                    "dc:modified": ""

                })

        self.views = [view, stat]

    def __parse_content(self):

        href = ""

        meta_item_value = ""

        if "Content" in settings.USE_GROUP_PERMISSIONS and self.content:

            if self.content not in self.viewable_contents:

                href = settings.FORBIDDEN_STREAM_URL

        elif self.content.videopath:

            href = self.content.videopath.rstrip('/') + "/" + self.content.src

            meta_item_value = self.content.videopath.rstrip('/') + "/"

        else:

            href = self.content.src

        media = {

             "http://advene.liris.cnrs.fr/ns/frame_of_reference/ms" : "o=0",

             "id" : self.content.iri_id,

             "href" : href,

             "unit" : "ms",

             "origin" : "0",

             "meta": {

                 "dc:creator" : "",

                 "dc:created" : self.content.creation_date.isoformat(),

                 "dc:contributor" : "",

                 "dc:modified" : self.content.update_date.isoformat(),

                 "dc:creator.contents" : "",

                 "dc:title" : self.content.title,

                 "dc:description" : self.content.description,

                 "dc:duration" : self.content.get_duration(),

                 "item": {

                     "name" : "streamer",

                     "value": meta_item_value,

                 },

             }

        }

        self.medias = [media]

    def __parse_segments(self):

        self.annotations = []

        for seg in self.segments:

            segment_tags = []

            for tag in seg.tags.split(';'):

                if not self.tags.has_key(tag):

                    new_tag = {

                        "meta": {

                            "dc:contributor": "IRI",

                            "dc:created": seg.date,

                            "dc:title": tag,

                            "dc:modified": seg.date,

                            "dc:creator": "IRI"

                        },

                        "id": unicode(uuid.uuid1())

                    }

                    self.tags[tag] = new_tag

                segment_tags.append({'id-ref': self.tags[tag]['id']})

            segment = {

                'begin': seg.start_ts,

                'end': seg.start_ts + seg.duration,

                'tags': seg.tags,

                'id': seg.element_id,

                'color': "%s" % self.default_color,

                'media': self.content.iri_id,

                'content': {

                    'mimetype': 'application/x-ldt-structured',

                    'description': seg.abstract,

                    'img': {

                        'src': ''

                    },

                    'title': seg.title,

                    'color': self.default_color,

                    'polemics': [ ],

                    'audio': {

                        'mimetype': 'audio/mp3',

                        'src': '',

                        'href': 'null'

                    }

                },

                'meta': {

                         "dc:creator": seg.author,

                         "dc:contributor": seg.author,

                         "dc:created": seg.date,

                         "dc:modified": seg.date,

                         "id-ref": seg.cutting_id,

                         "project": seg.project_id

                },

                'tags': segment_tags                       

            }

            self.annotations.append(segment)

    def serialize_to_cinelab(self):

        if not self.segments:

            return None

        self.__parse_content()

        self.__parse_segments()

        self.__parse_views()

        res = {}

        res['views'] = self.views 

        res['tags'] = self.tags.values() if len(self.tags) > 0 else None

        res['lists'] = None

        res['medias'] = self.medias

        res['annotations'] = self.annotations

        res['annotation-types'] = self.annotation_types

        return res