"""
Forms for the forums application.

"""
from collections import OrderedDict

from django import forms
from django.conf import settings

from forums.models import Forum
from forums.models import Topic
from forums.models import Post
from forums.attachments import AttachmentProcessor
import forums.permissions as perms
from forums.signals import notify_new_topic, notify_new_post
from core.html import ImageCheckError
from core.html import image_check
from core.markup import site_markup


FORUMS_FORM_CSS = {
    'all': (settings.GPP_THIRD_PARTY_CSS['markitup'] +
            settings.GPP_THIRD_PARTY_CSS['jquery-ui'])
}
FORUMS_FORM_JS = (
    settings.GPP_THIRD_PARTY_JS['markitup'] +
    settings.GPP_THIRD_PARTY_JS['jquery-ui'] +
    ['js/jquery.form.min.js', 'js/forums.js']
)


class NewPostForm(forms.Form):
    """Form for creating a new post."""
    body = forms.CharField(label='',
            required=False,
            widget=forms.Textarea(attrs={'class': 'markItUp smileyTarget'}))
    topic_id = forms.IntegerField(widget=forms.HiddenInput)
    topic = None

    class Media:
        css = FORUMS_FORM_CSS
        js = FORUMS_FORM_JS

    def __init__(self, *args, **kwargs):
        super(NewPostForm, self).__init__(*args, **kwargs)
        attachments = args[0].getlist('attachment') if len(args) else []
        self.attach_proc = AttachmentProcessor(attachments)

    def clean_body(self):
        body = self.cleaned_data['body']
        self.body_html = None
        if not body and not self.attach_proc.has_attachments():
            raise forms.ValidationError("Please enter some text")

        if body:
            self.body_html = site_markup(body)
            try:
                image_check(self.body_html)
            except ImageCheckError as ex:
                raise forms.ValidationError(str(ex))

        return body

    def clean_topic_id(self):
        id = self.cleaned_data['topic_id']
        try:
            self.topic = Topic.objects.select_related().get(pk=id)
        except Topic.DoesNotExist:
            raise forms.ValidationError('Invalid topic')
        return id

    def save(self, user, ip=None):
        """
        Creates a new post from the form data and supplied arguments.
        """
        post = Post(topic=self.topic, user=user, body=self.cleaned_data['body'],
                user_ip=ip)
        post.save(html=self.body_html)
        self.attach_proc.save_attachments(post)
        notify_new_post(post)
        return post


class NewTopicForm(forms.Form):
    """
    Form for creating a new topic and 1st post to that topic.
    Superusers and moderators can also create the topic as a sticky or initially
    locked.
    """
    name = forms.CharField(label='Subject', max_length=255,
            widget=forms.TextInput(attrs={'style': 'width:70%'}))
    body = forms.CharField(label='', required=False,
            widget=forms.Textarea(attrs={'class': 'markItUp smileyTarget'}))
    user = None
    forum = None
    has_mod_fields = False

    class Media:
        css = FORUMS_FORM_CSS
        js = FORUMS_FORM_JS

    def __init__(self, user, forum, *args, **kwargs):
        super(NewTopicForm, self).__init__(*args, **kwargs)
        self.user = user
        self.forum = forum

        if perms.can_moderate(forum, user):
            self.fields['sticky'] = forms.BooleanField(required=False)
            self.fields['locked'] = forms.BooleanField(required=False)
            self.has_mod_fields = True

        attachments = args[0].getlist('attachment') if len(args) else []
        self.attach_proc = AttachmentProcessor(attachments)

        # If this form is being POSTed, and the user is trying to add 
        # attachments, create hidden fields to list the Oembed ids. In
        # case the form isn't valid, the client-side javascript will know
        # which Oembed media to ask for when the form is displayed with
        # errors.
        if self.attach_proc.has_attachments():
            pks = self.attach_proc.get_ids()
            self.fields['attachment'] = forms.MultipleChoiceField(label='',
                    widget=forms.MultipleHiddenInput(),
                    choices=[(v, v) for v in pks])

    def clean_body(self):
        body = self.cleaned_data['body']
        self.body_html = None
        if not body and not self.attach_proc.has_attachments():
            raise forms.ValidationError("This field is required.")

        if body:
            self.body_html = site_markup(body)
            try:
                image_check(self.body_html)
            except ImageCheckError as ex:
                raise forms.ValidationError(str(ex))

        return body

    def save(self, ip=None):
        """
        Creates the new Topic and first Post from the form data and supplied
        arguments.
        """
        topic = Topic(forum=self.forum,
                name=self.cleaned_data['name'],
                user=self.user,
                sticky=self.has_mod_fields and self.cleaned_data['sticky'],
                locked=self.has_mod_fields and self.cleaned_data['locked'])
        topic.save()

        post = Post(topic=topic,
                user=self.user,
                body=self.cleaned_data['body'],
                user_ip=ip)
        post.save(html=self.body_html)

        self.attach_proc.save_attachments(post)

        notify_new_topic(topic)
        notify_new_post(post)

        return topic


class PostForm(forms.ModelForm):
    """
    Form for editing an existing post or a new, non-quick post.
    """
    body = forms.CharField(label='',
            required=False,
            widget=forms.Textarea(attrs={'class': 'markItUp smileyTarget'}))

    class Meta:
        model = Post
        fields = ('body', )

    class Media:
        css = FORUMS_FORM_CSS
        js = FORUMS_FORM_JS

    def __init__(self, *args, **kwargs):
        topic_name = kwargs.pop('topic_name', None)
        super(PostForm, self).__init__(*args, **kwargs)

        if topic_name is not None:
            # this is a "first post", add a field for a topic name
            new_fields = OrderedDict(name=forms.CharField(
                            label='Subject', max_length=255,
                            widget=forms.TextInput(attrs={
                                'class': 'title',
                                'style': 'width: 90%',
                            })))
            new_fields.update(self.fields)
            self.fields = new_fields
            self.initial['name'] = topic_name

        attachments = args[0].getlist('attachment') if len(args) else []
        self.attach_proc = AttachmentProcessor(attachments)

        # If this form is being used to edit an existing post, and that post
        # has attachments, create a hidden post_id field. The client-side
        # AJAX will use this as a cue to retrieve the HTML for the embedded
        # media.
        if 'instance' in kwargs:
            post = kwargs['instance']
            if post.attachments.count():
                self.fields['post_id'] = forms.CharField(label='',
                        widget=forms.HiddenInput(attrs={'value': post.id}))

    def clean_body(self):
        body = self.cleaned_data['body']
        self.body_html = None
        if not body and not self.attach_proc.has_attachments():
            raise forms.ValidationError('This field is required.')

        if body:
            self.body_html = site_markup(body)
            try:
                image_check(self.body_html)
            except ImageCheckError as ex:
                raise forms.ValidationError(str(ex))

        return body

    def save(self, *args, **kwargs):
        commit = kwargs.get('commit', False)
        post = super(PostForm, self).save(*args, **kwargs)

        # Are we saving a "first post"?
        if 'name' in self.cleaned_data:
            post.topic.name = self.cleaned_data['name']
            if commit:
                post.topic.save()
        return post


class MoveTopicForm(forms.Form):
    """
    Form for a moderator to move a topic to a forum.
    """
    forums = forms.ModelChoiceField(label='Move to forum',
          queryset=Forum.objects.none())

    def __init__(self, user, *args, **kwargs):
        hide_label = kwargs.pop('hide_label', False)
        required = kwargs.pop('required', True)
        super(MoveTopicForm, self).__init__(*args, **kwargs)
        self.fields['forums'].queryset = \
            Forum.objects.forums_for_user(user).order_by('name')
        if hide_label:
            self.fields['forums'].label = ''
        self.fields['forums'].required = required


class SplitTopicForm(forms.Form):
    """
    Form for a moderator to split posts from a topic to a new topic.
    """
    name = forms.CharField(label='New topic title', max_length=255,
            widget=forms.TextInput(attrs={'size': 64}))
    forums = forms.ModelChoiceField(label='Forum for new topic',
          queryset=Forum.objects.none())
    post_ids = []
    split_at = False

    def __init__(self, user, *args, **kwargs):
        super(SplitTopicForm, self).__init__(*args, **kwargs)
        self.fields['forums'].queryset = \
            Forum.objects.forums_for_user(user).order_by('name')

    def clean(self):
        self.post_ids = self.data.getlist('post_ids')
        if len(self.post_ids) == 0:
            raise forms.ValidationError('Please select some posts')

        self.split_at = 'split-at' in self.data
        if self.split_at and len(self.post_ids) > 1:
            raise forms.ValidationError('Please select only one post to split the topic at')

        return self.cleaned_data