from django import forms
from django.urls import reverse, reverse_lazy
from django.utils.translation import ugettext as _
from django.utils.safestring import mark_safe

from crispy_forms.helper import FormHelper
from crispy_forms.layout import Submit, Layout, HTML, Fieldset, Div
from crispy_forms.bootstrap import Tab, TabHolder, PrependedText, FormActions
from dal import autocomplete
from leaflet.forms.widgets import LeafletWidget

from apps.files.models import File

from .models import CaseStudy, SpatialRefSys
from .widgets import CommaSeparatedTextInput


class MinimumZoomWidget(LeafletWidget):
    geometry_field_class = 'MinimumZoomField'


class BaseCaseStudyForm(forms.models.ModelForm):
    """Base form class for the CaseStudy model."""

    def __init__(self, *args, **kwargs):
        super(BaseCaseStudyForm, self).__init__(*args, **kwargs)
        self.helper = FormHelper(self)
        self.helper.form_id = 'case-study-form'
        self.helper.form_class = 'form-horizontal'
        self.helper.form_method = 'post'
        self.helper.form_action = 'add'
        self.helper.label_class = 'col-lg-2'
        self.helper.field_class = 'col-lg-8'
        self.helper.include_media = False

    class Meta:
        model = CaseStudy
        fields = '__all__'
        widgets = {
            'location': MinimumZoomWidget(attrs={
                'settings_overrides': {
                    'SCALE': False
                }
            }),
        }


class ShortCaseStudyForm(BaseCaseStudyForm):
    """Short version of the CaseStudy form."""

    def __init__(self, *args, **kwargs):
        super(ShortCaseStudyForm, self).__init__(*args, **kwargs)
        self.helper.form_action = reverse('short-form')
        self.helper.add_input(Submit('submit', _('Submit'), css_class='btn-success center-block'))

    class Meta(BaseCaseStudyForm.Meta):
        fields = [
            'entry_name',
            'location',
            'sector_of_economy',
            'positive_or_negative',
            'country',
            'area_of_land',
            'land_ownership',
            'land_ownership_details',
            'location_context',
            'type_of_ecosystem',
            'describe_ecosystem',
            'people_affected_indigenous',
            'people_affected_other',
            'project_status',
            'synopsis',
            'full_description',
            'image',
            'image_caption',
            'image_credit',
            'video',
            'media_coverage_mainstream',
            'media_coverage_independent',
            'community_voices'
        ]


class BootstrapClearableFileInput(forms.ClearableFileInput):
    template_name = 'map/forms/widgets/file.html'


class LongCaseStudyForm(BaseCaseStudyForm):
    """Long version of the CaseStudy form."""

    official_project_documents = forms.FileField(
        widget=BootstrapClearableFileInput(attrs={
            'url': reverse_lazy('files:upload'),
            'field': 'official_project_documents_files',
        }), required=False
    )

    official_project_documents_files = forms.ModelMultipleChoiceField(
        queryset=File.objects.all(),
        widget=CommaSeparatedTextInput(),
        required=False
    )

    other_documents = forms.FileField(
        widget=BootstrapClearableFileInput(attrs={
            'url': reverse_lazy('files:upload'),
            'field': 'other_documents_files',
        }), required=False
    )

    other_documents_files = forms.ModelMultipleChoiceField(
        queryset=File.objects.all(),
        widget=CommaSeparatedTextInput(),
        required=False
    )

    shapefiles = forms.FileField(
        widget=BootstrapClearableFileInput(attrs={
            'url': reverse_lazy('files:upload'),
            'field': 'shapefiles_files',
        }), required=False
    )

    shapefiles_files = forms.ModelMultipleChoiceField(
        queryset=File.objects.all(),
        widget=CommaSeparatedTextInput(),
        required=False
    )

    coordinate_reference_system = forms.ModelChoiceField(
        queryset=SpatialRefSys.objects.all(),
        widget=autocomplete.ModelSelect2(url='srs-autocomplete'),
        initial=4326,
    )

    POSITIVE_CASE_TYPE_HELP = {
        'CREP': _("We are using the World Wind Energy Association's Community Power definition, \
                   which is that a community project is one where at least \
                   two of the following three criteria are met:<br> \
                   1. Local stakeholders own the majority or all of a project,<br> \
                   2. Voting control rests with the community-based organization,<br> \
                   3. The majority of social and economic benefits are distributed locally."),
        'EACP': _(""),
        'PSEP': _(""),
        'CORS': _("The extraction of non-renewable resources, such as iron, copper, \
                   rare-earth elements or other minerals and metals used in \
                   renewable technologies, directly from the Earth is by definition \
                   an unsustainable practice. Despite this, the extraction of such elements \
                   this way for use in the renewable energy transition is, to an extent, \
                   a necessary evil in the immediate term. Bearing this in mind, \
                   a case involving extraction may be considered 'positive' if it helps \
                   to reduce, overall, the need for more extraction; if it drastically \
                   reduces ecological harms often caused by mining and does not infringe \
                   on areas of high biodiversity; and if it meets outstanding social \
                   and human rights standards that are enjoyed and affirmed by \
                   host communities and other stakeholders. Such social standards include: \
                   ensuring communities, and especially indigenous peoples, \
                   enjoy their right to Free Prior and Informed Consent, \
                   which includes the right to reject projects; abiding by \
                   the UN's guiding principles on Business and Human Rights; \
                   full collaboration with the Extractive Industries Transparency Initiative, \
                   assuring excellence in the transparency of project financing, \
                   tax affairs and other transactions; the highest labour standards; \
                   equitable distribution of any benefits accruing from mining; \
                   respect for the rule of law and the constitutional rights of citizens \
                   in host countries."),
    }

    def __init__(self, *args, **kwargs):
        super(LongCaseStudyForm, self).__init__(*args, **kwargs)

        POSITIVE_CASE_TYPE_CHOICES = [
            (choice[0], mark_safe('<b>%s</b><br><span class="text-muted">%s</span>' % (choice[1], self.POSITIVE_CASE_TYPE_HELP[choice[0]])))
             for choice in CaseStudy.POSITIVE_CASE_TYPE_CHOICES
        ]

        self.fields['positive_case_type'] = forms.ChoiceField(
            widget=forms.RadioSelect(),
            choices=POSITIVE_CASE_TYPE_CHOICES
        )

        self.fields['project_owners'].required = True
        self.fields['shareholders'].required = True

        self.helper.form_action = reverse('long-form')
        self.helper.layout = Layout(
            TabHolder(
                Tab(_("Basic information"),
                    'entry_name',
                    'location',
                    'country',
                    'area_of_land',
                    'land_ownership',
                    'land_ownership_details',
                    'location_context',
                    'type_of_ecosystem',
                    'describe_ecosystem',
                    'people_affected_indigenous',
                    'people_affected_other',
                    'project_status',
                    'synopsis',
                    'full_description',
                    'image',
                    'image_caption',
                    'image_credit',
                    'video',
                    'video_caption',
                    'video_credit',
                    Fieldset(
                        _("Ownership and finance"),
                        'project_owners',
                        'shareholders',
                        'financial_institutions',
                        'financial_institutions_other',
                        'energy_customers'
                    ),
                    Fieldset(
                        _("Media reports and other communications"),
                        'media_coverage_mainstream',
                        'media_coverage_independent',
                        'community_voices',
                        'direct_comms',
                        'social_media_links'
                    ),
                    FormActions(
                        HTML("<a class='btn btn-primary btnNext pull-right'>"+_("Next")+"</a>")
                    )
                ),
                Tab(
                    _("Technical and economic analysis"),
                    'sector_of_economy',
                    Fieldset(
                        _("Power Generation Questions"),
                        'generation_technology',
                        'biomass_detail',
                        'generation_technology_other',
                        'total_generation_capacity',
                        'generation_equipment_supplier',
                        'total_investment',
                        'technical_or_economic_details',
                        css_id="power_generation_questions"
                    ),
                    Fieldset(
                        _("Power Grids/Energy Storage Questions"),
                        'power_technology',
                        'power_technology_other',
                        'energy_storage_capacity',
                        'maximum_power_output',
                        'discharge_time',
                        'contractor_or_supplier_of_technology',
                        'approximate_total_investment',
                        'additional_technical_details',
                        css_id="power_grids_energy_storage_questions"
                    ),
                    Fieldset(
                        _("Mineral/Commodity Questions"),
                        'minerals_or_commodities',
                        'minerals_or_commodities_other',
                        'use_in_energy_economy',
                        'use_in_energy_economy_other',
                        'project_life_span',
                        'size_of_concessions',
                        'projected_production_of_commodities',
                        'type_of_extraction',
                        'associated_infrastructure',
                        css_id="mineral_commodity_questions"
                    ),
                    FormActions(
                        HTML("<a class='btn btn-primary btnPrevious'>"+_("Previous")+"</a>"),
                        HTML("<a class='btn btn-primary btnNext pull-right'>"+_("Next")+"</a>")
                    )
                ),
                Tab(
                    _("Socio-environmental analysis"),
                    'positive_or_negative',
                    Fieldset(
                        _("Positive Case Questions"),
                        'positive_case_type',
                        'socioeconomic_benefits',
                        'project_status_detail',
                        'obstacles_and_hindrances',
                        'identified_partnerships',
                        css_id="positive_case_questions"
                    ),
                    Fieldset(
                        _("Negative Case Questions"),
                        'negative_case_reasons',
                        'negative_case_reasons_other',
                        'negative_socioenvironmental_impacts',
                        'isolated_or_widespread',
                        'when_did_organising_start',
                        'who_has_been_involved',
                        'participation_mechanisms',
                        'potential_partnerships',
                        'wants_conversation_with_ojuso',
                        css_id="negative_case_questions"
                    ),
                    Div(
                        'key_actors_involved',
                        css_id="common_questions"
                    ),
                    FormActions(
                        HTML("<a class='btn btn-primary btnPrevious'>"+_("Previous")+"</a>"),
                        HTML("<a class='btn btn-primary btnNext pull-right'>"+_("Next")+"</a>")
                    )
                ),
                Tab(
                    _("Contact details"),
                    'contact_email',
                    'contact_phone',
                    'contact_website',
                    PrependedText('contact_twitter', '@', placeholder='username'),
                    'contact_facebook',
                    'contact_other',
                    FormActions(
                        HTML("<a class='btn btn-primary btnPrevious'>"+_("Previous")+"</a>"),
                        HTML("<a class='btn btn-primary btnNext pull-right'>"+_("Next")+"</a>")
                    )
                ),
                Tab(
                    _("Uploads"),
                    'official_project_documents',
                    'official_project_documents_files',
                    'other_documents',
                    'other_documents_files',
                    'shapefiles',
                    'shapefiles_files',
                    'coordinate_reference_system',
                    'name_of_territory_or_area',
                    'shown_on_other_platforms',
                    'shown_on_other_platforms_detail',
                    FormActions(
                        HTML("<a class='btn btn-primary btnPrevious'>"+_("Previous")+"</a>"),
                        Submit('submit', _('Submit'), css_class="btn-success pull-right")
                    )
                )))

    class Meta(BaseCaseStudyForm.Meta):
        exclude = ('approved',)

    class Media:
        js = (
            'files/jquery.ui.widget.js',
            'files/jquery.iframe-transport.js',
            'files/jquery.fileupload.js',
            'files/upload.js',
        )