from django.conf import settings

from datetime import datetime

from django.utils.datastructures import SortedDict

from ldt.ldt_utils.models import Content

from ldt.ldt_utils.utils import reduce_text_node

from ldt.ldt_utils.models import User, Project

import logging

import lxml.etree

import uuid

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

"""

Serialize a project object to a cinelab compatible array

"""

class ProjectSerializer:

    def __init__(self, project, from_contents=True, from_display=True, first_cutting=None, viewable_contents=[]):

        self.project = project

        self.parsed = False

        self.ldt_doc = None

        self.medias_dict = SortedDict()

        self.annotations_dict = SortedDict()

        self.annotations_by_annotation_types = {}

        self.tags = {}

        self.tags_dict = SortedDict()

        self.annotation_types_dict = SortedDict()

        self.views_dict = SortedDict()

        self.lists_dict = SortedDict()

        self.serialize_contents = from_contents

        self.from_display = from_display

        self.display_contents_list = []

        self.display_cuttings_list = []

        self.display_ensemble_list = []

        self.viewable_contents = viewable_contents

        self.first_cutting = first_cutting

    def __parse_views(self, display_node_list):

        for display_node in display_node_list:

            display_id = display_node.get(u"id", None)

            if not display_id:

                continue

            content_list = []

            cuttings_list = []

            new_display = {

                "id": display_id,

                "contents": content_list,

                "annotation_types": cuttings_list,

            }

            for content_node in display_node.xpath("content"):

                content_id = content_node.get("id")

                if content_id not in content_list:

                    content_list.append(content_id)                    

                if content_id not in self.display_contents_list:

                    self.display_contents_list.append(content_id)

                for cutting_node  in content_node.xpath("decoupage"):

                    cutting_id = cutting_node.get("id")

                    if cutting_id not in cuttings_list:

                        cuttings_list.append(cutting_id)

                    if cutting_id not in self.display_cuttings_list:

                        self.display_cuttings_list.append(cutting_id)

                    ensemble_id = cutting_node.get("idens")

                    if ensemble_id not in self.display_ensemble_list:

                        self.display_ensemble_list.append(ensemble_id)

            # sets cutting to display in first position for the metadataplayer

            if self.first_cutting:

                annotation_types = new_display['annotation_types']

                if len(annotation_types) > 1:

                    index = -1

                    for i, s in enumerate(annotation_types):

                        if s == self.first_cutting: 

                            index = i

                            break

                    if index >= 0:

                        annotation_types[0], annotation_types[index] = annotation_types[index], annotation_types[0]

            self.views_dict[display_id] = new_display

    def __parse_ensemble(self, ensemble_node, content):

        ensemble_id = ensemble_node.attrib[u"id"]

        ensemble_author = ensemble_node.attrib[u"author"]

        ensemble_title = ensemble_node.attrib[u"title"]

        ensemble_description = ensemble_node.attrib[u"abstract"]

        ensemble_created = datetime.utcnow().isoformat()

        ensemble_modified = ensemble_created 

        list_items = []

        new_list = {

            "id" : ensemble_id,

            "items" : list_items,

            "meta" : {

                "dc:creator":ensemble_author,

                "dc:created": ensemble_created,

                "dc:contributor":"undefined",

                "dc:modified": ensemble_modified,

                "dc:title":ensemble_title,

                "dc:description": ensemble_description,

                "id-ref":content.iri_id,

                "editable":"false"

            }

        }

        for decoupage_node in ensemble_node:

            if decoupage_node.tag != "decoupage" :

                continue

            decoupage_id = decoupage_node.attrib[ u"id"]

            if self.from_display and decoupage_id not in self.display_cuttings_list:

                continue

            decoupage_creator = decoupage_node.attrib[u"author"]

            if not decoupage_creator:

                decoupage_creator = "IRI"

            decoupage_contributor = decoupage_creator

            date_str = decoupage_node.get(u"date")

            decoupage_created = None

            if date_str :

                for date_format in DATE_FORMATS:

                    try:

                        decoupage_created = datetime.strptime(date_str, date_format).isoformat()

                        break

                    except Exception:

                        decoupage_created = None

            if decoupage_created is None:

                decoupage_created = datetime.utcnow().isoformat()

            decoupage_modified = decoupage_created

            decoupage_title = ""

            for txtRes in decoupage_node.xpath("title/text()", smart_strings=False): 

                    decoupage_title += txtRes

            decoupage_description = ""

            for txtRes in decoupage_node.xpath("abstract/text()", smart_strings=False): 

                    decoupage_description += txtRes

            list_items.append({"id-ref":decoupage_id})

            new_annotation_types = {

                "id":decoupage_id,

                "dc:creator":decoupage_creator,

                "dc:created":decoupage_created,

                "dc:contributor":decoupage_contributor,

                "dc:modified":decoupage_modified,

                "dc:title":decoupage_title,

                "dc:description":decoupage_description

            }

            self.annotation_types_dict[decoupage_id] = new_annotation_types

            self.annotations_by_annotation_types[decoupage_id] = []

            res = decoupage_node.xpath("elements/element")

            for element_node in res:

                element_id = element_node.attrib[u"id"]

                element_begin = element_node.attrib[u"begin"]

                element_duration = element_node.attrib[u"dur"]

                element_media = content.iri_id

                element_color = element_node.attrib.get(u"color", "")

                element_ldt_src = element_node.attrib.get(u"src", "")

                element_title = reduce_text_node(element_node, "title/text()")        

                element_description = reduce_text_node(element_node, "abstract/text()")                

                element_source_node_list = element_node.xpath("meta/source")

                if len(element_source_node_list) > 0:

                    element_source_node = element_source_node_list[0]

                    element_source = {"mimetype" :element_source_node.get(u'mimetype'), "url":element_source_node.get(u'url'), "content":reduce_text_node(element_source_node)}

                else:

                    element_source = None

                element_audio_src = ""

                element_audio_href = ""

                res = element_node.xpath("audio")

                if len(res) > 0:

                    element_audio_src = res[0].get(u"source", u"")

                    element_audio_href = res[0].text                

                element_tags = []

                tags = element_node.get(u"tags", u"")

                tags_list = map(lambda s:s.strip(), tags.split(","))

                #tags                                

                if tags is None or len(tags) == 0:

                    tags_list = []

                    restagnode = element_node.xpath("tag/text()", smart_strings=False)

                    for tagnode in restagnode:

                        tags_list.append(tagnode)

                if tags_list is None or len(tags_list) == 0:

                    tags_list = []

                    restagnode = element_node.xpath("tags/tag/text()", smart_strings=False)

                    for tagnode in restagnode:

                        tags_list.append(tagnode)

                tag_date = datetime.utcnow().isoformat()

                for tag_title in tags_list:

                    if tag_title not in self.tags:

                        tag_id = unicode(uuid.uuid1())

                        new_tag = {

                            "id":tag_id,

                            "meta" : {

                                "dc:creator":"IRI",

                                "dc:created": tag_date,

                                "dc:contributor":"IRI",

                                "dc:modified": tag_date,

                                "dc:title":tag_title

                            }

                        }

                        self.tags[tag_title] = new_tag

                        self.tags_dict[tag_id] = new_tag

                    element_tags.append({"id-ref":tag_id})

                if not element_tags:

                    element_tags = None

                new_annotation = {

                    "begin": int(element_begin),

                    "end": int(element_begin) + int(element_duration),

                    "id": element_id,

                    "media": element_media,

                    "color": element_color,

                    "content": {

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

                        "title": element_title,

                        "description": element_description,

                        "color": element_color,

                        "img": {

                            "src": element_ldt_src,

                        },

                        "audio": {

                            "src" : element_audio_src,

                            "mimetype": "audio/mp3",

                            "href": element_audio_href

                        },

                        "polemics" :[pol_elem.text for pol_elem in element_node.xpath("meta/polemics/polemic")],

                    },

                    "tags": element_tags,

                    "meta": {

                        "id-ref": decoupage_id,

                        "dc:creator": decoupage_creator,

                        "dc:contributor": decoupage_contributor,

                        "dc:created": decoupage_created,

                        "dc:modified": decoupage_modified,

                    }

                }

                if element_source:

                    new_annotation['meta']['dc:source'] = element_source

                self.annotations_dict[element_id] = new_annotation

                self.annotations_by_annotation_types[decoupage_id].append(new_annotation)

        if not list_items:

            new_list["items"] = None

        self.lists_dict[ensemble_id] = new_list

    def __parse_ldt(self):

        self.ldt_doc = lxml.etree.fromstring(self.project.ldt.encode("utf-8"))

        if self.from_display:

            xpath_str = "/iri/displays/display[position()=1]"

            if isinstance(self.from_display, basestring):

                xpath_str = "/iri/displays/display[@id='%s']" % self.from_display

            self.__parse_views(self.ldt_doc.xpath(xpath_str))

        res = self.ldt_doc.xpath("/iri/medias/media")

        for mediaNode in res:

            iri_id = mediaNode.attrib[u"id"]

            if self.from_display and iri_id not in self.display_contents_list:

                continue

            content = Content.objects.get(iri_id=iri_id) #@UndefinedVariable

            self.__parse_content(content)

        res = self.ldt_doc.xpath("/iri/annotations/content")

        for content_node in res:

            content_id = content_node.attrib[u"id"]

            if self.from_display and content_id not in self.display_contents_list:

                continue

            content = Content.objects.get(iri_id=content_id) #@UndefinedVariable

            for ensemble_node in content_node:

                if ensemble_node.tag != "ensemble" :

                    continue

                ensemble_id = ensemble_node.get("id")

                if self.from_display and ensemble_id not in self.display_ensemble_list:

                    continue

                self.__parse_ensemble(ensemble_node, content)            

        #reorder annotations and annotation type from view

        if self.from_display and len(self.views_dict) > 0:

            new_annotation_types_dict = SortedDict()

            new_annotations_dict = SortedDict()

            for annotation_type in self.display_cuttings_list:

                if annotation_type in self.annotation_types_dict:

                    new_annotation_types_dict[annotation_type] = self.annotation_types_dict[annotation_type]

                    for annot in self.annotations_by_annotation_types[annotation_type]:

                        new_annotations_dict[annot['id']] = annot

            self.annotations_dict = new_annotations_dict

            self.annotation_types_dict = new_annotation_types_dict

        self.parsed = True

    def __parse_content(self, content):

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

        authors = content.authors.all()

        if len(authors) > 0 :

            author = authors[0].handle

        else :

            author = "IRI"

        if len(authors) > 1 :

            contributor = authors[1].handle

        else :

            contributor = author

        content_author = ""

        res = doc.xpath("/iri/head/meta[@name='author']/@content")

        if len(res) > 0:

            content_author = res[0]

        content_date = ""

        res = doc.xpath("/iri/head/meta[@name='date']/@content")

        if len(res) > 0:

            content_date = res[0]

        href = ""

        meta_item_value = ""

        if content.iri_id not in self.viewable_contents:

            href = settings.FORBIDDEN_STREAM_URL

        elif content.videopath:

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

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

        else:

            href = content.src

        new_media = {

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

             "id" : content.iri_id,

             "href" : href,

             "unit" : "ms",

             "origin" : "0",

             "meta": {

                 "dc:creator" : author,

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

                 "dc:contributor" : contributor,

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

                 "dc:creator.contents" : content_author,

                 "dc:created.contents" : content_date,

                 "dc:title" : content.title,

                 "dc:description" : content.description,

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

                 "item": {

                     "name" : "streamer",

                     "value": meta_item_value,

                 },

             }

        }

        self.medias_dict[content.iri_id] = new_media

        if self.serialize_contents:        

            res = doc.xpath("/iri/body/ensembles/ensemble")

            for ensemble_node in res:

                self.__parse_ensemble(ensemble_node, content)

    def serialize_to_cinelab(self):

        res = {}

        if not self.parsed:

            self.__parse_ldt()