from django import forms
from django.utils.translation import ugettext_lazy as _
from django.utils.translation import ugettext
from django.core.urlresolvers import reverse
from django.utils.safestring import mark_safe
from django.conf import settings

from common.forms import DetailForm
from common.literals import PAGE_SIZE_CHOICES, PAGE_ORIENTATION_CHOICES
from common.conf.settings import DEFAULT_PAPER_SIZE
from common.conf.settings import DEFAULT_PAGE_ORIENTATION
from common.widgets import TextAreaDiv 

from documents.models import Document, DocumentType, \
    DocumentPage, DocumentPageTransformation, DocumentTypeFilename
from documents.widgets import document_html_widget

# Document page forms
class DocumentPageTransformationForm(forms.ModelForm):
    class Meta:
        model = DocumentPageTransformation

    def __init__(self, *args, **kwargs):
        super(DocumentPageTransformationForm, self).__init__(*args, **kwargs)
        self.fields['document_page'].widget = forms.HiddenInput()


class DocumentPageImageWidget(forms.widgets.Widget):
    def render(self, name, value, attrs=None):
        final_attrs = self.build_attrs(attrs)
        zoom = final_attrs.get('zoom', 100)
        rotation = final_attrs.get('rotation', 0)
        if value:
            output = []
            output.append('<div class="full-height scrollable" style="overflow: auto;">')

            output.append(document_html_widget(value.document, view='document_display', page=value.page_number, zoom=zoom, rotation=rotation))
            output.append('</div>')
            return mark_safe(u''.join(output))
        else:
            return u''


class DocumentPageForm(DetailForm):
    class Meta:
        model = DocumentPage
        exclude = ('document', 'document_type', 'page_label', 'content')

    def __init__(self, *args, **kwargs):
        zoom = kwargs.pop('zoom', 100)
        rotation = kwargs.pop('rotation', 0)
        super(DocumentPageForm, self).__init__(*args, **kwargs)
        self.fields['page_image'].initial = self.instance
        self.fields['page_image'].widget.attrs.update({
            'zoom': zoom,
            'rotation': rotation
        })

    page_image = forms.CharField(
        label=_(u'Page image'), widget=DocumentPageImageWidget()
    )


class DocumentPageForm_text(DetailForm):
    class Meta:
        model = DocumentPage
        fields = ('page_label', 'content')

    content = forms.CharField(
        label=_(u'Contents'),
        widget=forms.widgets.Textarea(attrs={
            'rows': 18, 'cols': 80, 'readonly': 'readonly'
        }))


class DocumentPageForm_edit(forms.ModelForm):
    class Meta:
        model = DocumentPage
        fields = ('page_label', 'content')

    def __init__(self, *args, **kwargs):
        super(DocumentPageForm_edit, self).__init__(*args, **kwargs)
        self.fields['page_image'].initial = self.instance
        self.fields.keyOrder = [
            'page_image',
            'page_label',
            'content',
        ]
    page_image = forms.CharField(
        required=False, widget=DocumentPageImageWidget()
    )


# Document forms
class DocumentPagesCarouselWidget(forms.widgets.Widget):
    """
    Display many small representations of a document pages
    """
    def render(self, name, value, attrs=None):
        output = []
        output.append(u'<div style="white-space:nowrap; overflow: auto;">')

        for page in value.pages.all():
            output.append(u'<div style="display: inline-block; margin: 5px 10px 10px 10px;">')
            output.append(
                document_html_widget(
                    page.document,
                    view='document_preview_multipage',
                    click_view='document_display',
                    page=page.page_number,
                    gallery_name='document_pages',
                    fancybox_class='fancybox-noscaling',
                )
            )
            output.append(u'<div class="tc">')
            output.append(u'<a class="fancybox-iframe" href="%s"><span class="famfam active famfam-page_white_go"></span>%s</a>' % (reverse('document_page_view', args=[page.pk]), ugettext(u'Details')))
            output.append(u'</div>')
            output.append(u'</div>')

        output.append(u'</div>')
        output.append(u'<br /><span class="famfam active famfam-magnifier"></span>%s' % ugettext(u'Click on the image for full size preview'))

        return mark_safe(u''.join(output))


class DocumentPreviewForm(forms.Form):
    def __init__(self, *args, **kwargs):
        document = kwargs.pop('document', None)
        super(DocumentPreviewForm, self).__init__(*args, **kwargs)
        self.fields['preview'].initial = document
        self.fields['preview'].label = _(u'Document pages (%s)') % document.pages.count()

    preview = forms.CharField(widget=DocumentPagesCarouselWidget())


class DocumentForm(forms.ModelForm):
    """
    Baseform for document creation, and editing, made generic enough to
    be used by document creation from staging files
    """
    class Meta:
        model = Document
        exclude = ('description', 'tags', 'document_type')

    def __init__(self, *args, **kwargs):
        document_type = kwargs.pop('document_type', None)
        instance = kwargs.pop('instance', None)

        super(DocumentForm, self).__init__(*args, **kwargs)

        if 'document_type' in self.fields:
            # To allow merging with DocumentForm_edit
            self.fields['document_type'].widget = forms.HiddenInput()

        # Instance's document_type overrides the passed document_type
        if instance:
            if hasattr(instance, 'document_type'):
                document_type = instance.document_type

        if document_type:
            filenames_qs = document_type.documenttypefilename_set.filter(enabled=True)
            if filenames_qs.count() > 0:
                self.fields['document_type_available_filenames'] = forms.ModelChoiceField(
                    queryset=filenames_qs,
                    required=False,
                    label=_(u'Quick document rename'))

    new_filename = forms.CharField(
        label=_('New document filename'), required=False
    )


class DocumentForm_edit(DocumentForm):
    """
    Form sub classes from DocumentForm used only when editing a document
    """
    class Meta:
        model = Document
        exclude = ('file', 'document_type', 'tags')


class DocumentPropertiesForm(DetailForm):
    """
    Detail class form to display a document file based properties
    """
    class Meta:
        model = Document
        exclude = ('file', 'tags')


class DocumentContentForm(forms.Form):
    """
    Form that concatenates all of a document pages' text content into a
    single textarea widget
    """
    def __init__(self, *args, **kwargs):
        self.document = kwargs.pop('document', None)
        super(DocumentContentForm, self).__init__(*args, **kwargs)
        content = []
        self.fields['contents'].initial = u''
        for page in self.document.pages.all():
            if page.content:
                content.append(page.content)
                content.append(u'\n\n\n - Page %s - \n\n\n' % page.page_number)

        self.fields['contents'].initial = u''.join(content)

    contents = forms.CharField(
        label=_(u'Contents'),
        widget=TextAreaDiv()
    )


class DocumentTypeSelectForm(forms.Form):
    """
    Form to select the document type of a document to be created, used
    as form #1 in the document creation wizard
    """
    document_type = forms.ModelChoiceField(queryset=DocumentType.objects.all(), label=(u'Document type'), required=False)


class PrintForm(forms.Form):
    page_size = forms.ChoiceField(choices=PAGE_SIZE_CHOICES, initial=DEFAULT_PAPER_SIZE, label=_(u'Page size'), required=False)
    custom_page_width = forms.CharField(label=_(u'Custom page width'), required=False)
    custom_page_height = forms.CharField(label=_(u'Custom page height'), required=False)
    page_orientation = forms.ChoiceField(choices=PAGE_ORIENTATION_CHOICES, initial=DEFAULT_PAGE_ORIENTATION, label=_(u'Page orientation'), required=True)
    page_range = forms.CharField(label=_(u'Page range'), required=False)


class DocumentTypeForm(forms.ModelForm):
    """
    Model class form to create or edit a document type
    """
    class Meta:
        model = DocumentType


class DocumentTypeFilenameForm(forms.ModelForm):
    """
    Model class form to edit a document type filename
    """
    class Meta:
        model = DocumentTypeFilename
        fields = ('filename', 'enabled')


class DocumentTypeFilenameForm_create(forms.ModelForm):
    """
    Model class form to create a new document type filename
    """
    class Meta:
        model = DocumentTypeFilename
        fields = ('filename',)