from __future__ import unicode_literals

import os

import uuid

from django.core.urlresolvers import reverse

from django.db import models

from django.db.models import Q

from django.utils.encoding import python_2_unicode_compatible

from django.utils.translation import ugettext_lazy as _

from django.utils.timezone import now

from django.contrib.auth.models import User

from django.core.exceptions import ObjectDoesNotExist

from django.core.exceptions import ValidationError

from model_utils.managers import InheritanceManager

from reversion import revisions as reversion

from symposion.markdown_parser import parse

from symposion.conference.models import Section

from symposion.speakers.models import Speaker

@python_2_unicode_compatible

class ProposalSection(models.Model):

    """

    configuration of proposal submissions for a specific Section.

    a section is available for proposals iff:

      * it is after start (if there is one) and

      * it is before end (if there is one) and

      * closed is NULL or False

    """

    section = models.OneToOneField(Section, verbose_name=_("Section"))

    start = models.DateTimeField(null=True, blank=True, verbose_name=_("Start"))

    end = models.DateTimeField(null=True, blank=True, verbose_name=_("End"))

    closed = models.NullBooleanField(verbose_name=_("Closed"))

    published = models.NullBooleanField(verbose_name=_("Published"))

    @classmethod

    def available(cls):

        return cls._default_manager.filter(

            Q(start__lt=now()) | Q(start=None),

            Q(end__gt=now()) | Q(end=None),

            Q(closed=False) | Q(closed=None),

        )

    def is_available(self):

        if self.closed:

            return False

        if self.start and self.start > now():

            return False

        if self.end and self.end < now():

            return False

        return True

    def __str__(self):

        return self.section.name

@python_2_unicode_compatible

class ProposalKind(models.Model):

    """

    e.g. talk vs panel vs tutorial vs poster

    Note that if you have different deadlines, reviewers, etc. you'll want

    to distinguish the section as well as the kind.

    """

    section = models.ForeignKey(Section, related_name="proposal_kinds", verbose_name=_("Section"))

    name = models.CharField(_("Name"), max_length=100)

    slug = models.SlugField(verbose_name=_("Slug"))

    def __str__(self):

        return self.name

@python_2_unicode_compatible

class ProposalBase(models.Model):

    objects = InheritanceManager()

    kind = models.ForeignKey(ProposalKind, verbose_name=_("Kind"))

    title = models.CharField(max_length=100, verbose_name=_("Title"))

    abstract = models.TextField(

        _("Abstract"),

                    "href='http://daringfireball.net/projects/markdown/basics' " "target='_blank'>Markdown</a>.")

    )

    abstract_html = models.TextField(blank=True)

    private_abstract = models.TextField(

        _("Private Abstract"),

        help_text=_("This will only be shown to organisers and reviewers. You "

                    "should provide any details about your proposal that you "

                    "don't want to be public here. Edit using <a " "href='http://daringfireball.net/projects/markdown/basics' "

                    "target='_blank'>Markdown</a>.")

    )

    private_abstract_html = models.TextField(blank=True)

    technical_requirements = models.TextField(

        _("Special Requirements"),

        blank=True,

        help_text=_("Speakers will be provided with: Internet access, power, "

                    "projector, audio.  If you require anything in addition, "

                    "please list your technical requirements here.  Such as: a "

                    "static IP address, A/V equipment or will be demonstrating "

                    "security-related techniques on the conference network. "

                    "Edit using <a "

                    "href='http://daringfireball.net/projects/markdown/basics' "

                    "target='_blank'>Markdown</a>.")

    )

    technical_requirements_html = models.TextField(blank=True)

        max_length=100,

        blank=True,

        help_text=_("The name of the project you will be talking about."),

    )

    project_url = models.URLField(

        _("Project URL"),

        blank=True,

        help_text=_("If your project has a webpage, specify the URL here so "

                    "the committee can find out more about your proposal.")

    )

    video_url = models.URLField(

        _("Video"),

        blank=True,

        help_text=_("You may optionally provide us with a link to a video of "

                    "you speaking at another event, or of a short 'elevator "

                    "pitch' of your proposed talk.")

    )

    submitted = models.DateTimeField(

        default=now,

        editable=False,

        verbose_name=_("Submitted")

    )

    speaker = models.ForeignKey(Speaker, related_name="proposals", verbose_name=_("Speaker"))

    # @@@ this validation used to exist as a validators keyword on additional_speakers

    #     M2M field but that is no longer supported by Django. Should be moved to

    #     the form level

    def additional_speaker_validator(self, a_speaker):

        if a_speaker.speaker.email == self.speaker.email:

            raise ValidationError(_("%s is same as primary speaker.") % a_speaker.speaker.email)

        if a_speaker in [self.additional_speakers]:

            raise ValidationError(_("%s has already been in speakers.") % a_speaker.speaker.email)

    additional_speakers = models.ManyToManyField(Speaker, through="AdditionalSpeaker",

                                                 blank=True, verbose_name=_("Addtional speakers"))

    cancelled = models.BooleanField(default=False, verbose_name=_("Cancelled"))

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

        self.abstract_html = parse(self.abstract)

        self.private_abstract_html = parse(self.private_abstract)

        self.technical_requirements_html = parse(self.technical_requirements)

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

    def can_edit(self):

        return True

    @property

    def section(self):

        return self.kind.section

    @property

    def speaker_email(self):

        return self.speaker.email

    @property

    def number(self):

        return str(self.pk).zfill(3)

    @property

    def status(self):

        try:

            return self.result.status

        except ObjectDoesNotExist:

            return _('Undecided')

    def speakers(self):

        yield self.speaker

        speakers = self.additional_speakers.exclude(

            additionalspeaker__status=AdditionalSpeaker.SPEAKING_STATUS_DECLINED)

        for speaker in speakers:

            yield speaker

    def notification_email_context(self):

        return {

            "title": self.title,

            "speaker": self.speaker.name,

            "speakers": ', '.join([x.name for x in self.speakers()]),

            "kind": self.kind.name,

        }

    def __str__(self):

        return self.title

reversion.register(ProposalBase)

@python_2_unicode_compatible

class AdditionalSpeaker(models.Model):

    SPEAKING_STATUS_PENDING = 1

    SPEAKING_STATUS_ACCEPTED = 2

    SPEAKING_STATUS_DECLINED = 3

    SPEAKING_STATUS = [

        (SPEAKING_STATUS_PENDING, _("Pending")),