from __future__ import absolute_import

from django import forms
from django.utils.encoding import force_unicode
from django.utils.html import conditional_escape
from django.utils.safestring import mark_safe
from django.utils.translation import ugettext_lazy as _
from django.utils.translation import ugettext

from common.forms import DetailForm
from common.widgets import TextAreaDiv

from .models import (Document, DocumentType, DocumentPage,
                     DocumentPageTransformation, DocumentTypeFilename,
                     DocumentVersion)
from .literals import DEFAULT_ZIP_FILENAME
from .widgets import DocumentPagesCarouselWidget, DocumentPageImageWidget


# 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 DocumentPageForm(DetailForm):
    class Meta:
        model = DocumentPage
        fields = ()

    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 DocumentPreviewForm(forms.Form):
    def __init__(self, *args, **kwargs):
        document = kwargs.pop('document', None)
        super(DocumentPreviewForm, self).__init__(*args, **kwargs)
        self.fields['preview'].initial = document
        try:
            self.fields['preview'].label = _(u'Document pages (%d)') % document.page_count
        except AttributeError:
            self.fields['preview'].label = _(u'Document pages (%d)') % 0

    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 = ('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()

        if instance:
            self.fields['use_file_name'] = forms.BooleanField(
                label=_(u'Use the new version filename as the document filename'),
                initial=False,
                required=False,
            )

        # 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'))

        if instance:
            if instance.latest_version:
                self.version_fields(instance)

    def version_fields(self, document):
        self.fields['version_update'] = forms.ChoiceField(
            label=_(u'Version update'),
            choices=DocumentVersion.get_version_update_choices(document.latest_version)
        )

        self.fields['comment'] = forms.CharField(
            label=_(u'Comment'),
            required=False,
            widget=forms.widgets.Textarea(attrs={'rows': 4}),
        )

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

    def clean(self):
        cleaned_data = self.cleaned_data
        cleaned_data['new_version_data'] = {
            'comment': self.cleaned_data.get('comment'),
            'version_update': self.cleaned_data.get('version_update'),
        }

        # Always return the full collection of cleaned data.
        return cleaned_data


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

    def __init__(self, *args, **kwargs):
        super(DocumentForm_edit, self).__init__(*args, **kwargs)
        if kwargs['instance'].latest_version:
            self.fields.pop('version_update')
            self.fields.pop('comment')
        else:
            self.fields.pop('new_filename')

        self.fields.pop('use_file_name')


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


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''
        try:
            document_pages = self.document.pages.all()
        except AttributeError:
            document_pages = []

        for page in document_pages:
            if page.content:
                content.append(conditional_escape(force_unicode(page.content)))
                content.append(u'\n\n\n<hr/><div style="text-align: center;">- %s %s -</div><hr/>\n\n\n' % (ugettext(u'Page'), page.page_number))

        self.fields['contents'].initial = mark_safe(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_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',)


class DocumentDownloadForm(forms.Form):
    compressed = forms.BooleanField(label=_(u'Compress'), required=False, help_text=_(u'Download the document in the original format or in a compressed manner.  This option is selectable only when downloading one document, for multiple documents, the bundle will always be downloads as a compressed file.'))
    zip_filename = forms.CharField(initial=DEFAULT_ZIP_FILENAME, label=_(u'Compressed filename'), required=False, help_text=_(u'The filename of the compressed file that will contain the documents to be downloaded, if the previous option is selected.'))

    def __init__(self, *args, **kwargs):
        self.document_versions = kwargs.pop('document_versions', None)
        super(DocumentDownloadForm, self).__init__(*args, **kwargs)
        if len(self.document_versions) > 1:
            self.fields['compressed'].initial = True
            self.fields['compressed'].widget.attrs.update({'disabled': True})