__copyright__ = "Copyright © Stichting SciPost (SciPost Foundation)"
__license__ = "AGPL v3"


import datetime

from django import forms
from django.contrib.auth import get_user_model

from scipost.fields import UserModelChoiceField

from . import constants
from .models import ProductionUser, ProductionStream, ProductionEvent, Proofs,\
    ProductionEventAttachment
from .signals import notify_stream_status_change

today = datetime.datetime.today()


class ProductionEventForm(forms.ModelForm):
    class Meta:
        model = ProductionEvent
        fields = (
            'comments',
        )
        widgets = {
            'comments': forms.Textarea(attrs={'rows': 4}),
        }


class AssignOfficerForm(forms.ModelForm):
    class Meta:
        model = ProductionStream
        fields = ('officer',)

    def save(self, commit=True):
        stream = super().save(False)
        if commit:
            if stream.status == constants.PRODUCTION_STREAM_INITIATED:
                stream.status = constants.PROOFS_TASKED
            stream.save()
        return stream


class AssignInvitationsOfficerForm(forms.ModelForm):
    class Meta:
        model = ProductionStream
        fields = ('invitations_officer',)


class AssignSupervisorForm(forms.ModelForm):
    class Meta:
        model = ProductionStream
        fields = ('supervisor',)

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['supervisor'].queryset = self.fields['supervisor'].queryset.filter(
            user__groups__name='Production Supervisor')


class StreamStatusForm(forms.ModelForm):
    class Meta:
        model = ProductionStream
        fields = ('status',)

    def __init__(self, *args, **kwargs):
        self.current_production_user = kwargs.pop('production_user')
        super().__init__(*args, **kwargs)
        self.fields['status'].choices = self.get_available_statuses()

    def get_available_statuses(self):
        if self.instance.status in [constants.PRODUCTION_STREAM_INITIATED,
                                    constants.PRODUCTION_STREAM_COMPLETED,
                                    constants.PROOFS_ACCEPTED,
                                    constants.PROOFS_CITED]:
            # No status change can be made by User
            return ()
        elif self.instance.status == constants.PROOFS_TASKED:
            return (
                (constants.PROOFS_PRODUCED, 'Proofs have been produced'),
            )
        elif self.instance.status == constants.PROOFS_PRODUCED:
            return (
                (constants.PROOFS_CHECKED, 'Proofs have been checked by Supervisor'),
                (constants.PROOFS_SENT, 'Proofs sent to Authors'),
            )
        elif self.instance.status == constants.PROOFS_CHECKED:
            return (
                (constants.PROOFS_SENT, 'Proofs sent to Authors'),
                (constants.PROOFS_CORRECTED, 'Corrections implemented'),
            )
        elif self.instance.status == constants.PROOFS_SENT:
            return (
                (constants.PROOFS_RETURNED, 'Proofs returned by Authors'),
                (constants.PROOFS_ACCEPTED, 'Authors have accepted proofs'),
            )
        elif self.instance.status == constants.PROOFS_RETURNED:
            return (
                (constants.PROOFS_CHECKED, 'Proofs have been checked by Supervisor'),
                (constants.PROOFS_SENT, 'Proofs sent to Authors'),
                (constants.PROOFS_CORRECTED, 'Corrections implemented'),
                (constants.PROOFS_ACCEPTED, 'Authors have accepted proofs'),
            )
        elif self.instance.status == constants.PROOFS_CORRECTED:
            return (
                (constants.PROOFS_CHECKED, 'Proofs have been checked by Supervisor'),
                (constants.PROOFS_SENT, 'Proofs sent to Authors'),
                (constants.PROOFS_ACCEPTED, 'Authors have accepted proofs'),
            )
        elif self.instance.status == constants.PROOFS_PUBLISHED:
            return (
                (constants.PROOFS_CITED, 'Cited people have been notified/invited to SciPost'),
            )
        return ()

    def save(self, commit=True):
        stream = super().save(commit)
        if commit:
            event = ProductionEvent(
                stream=stream,
                event='status',
                comments='Stream changed status to: {status}'.format(
                    status=stream.get_status_display()),
                noted_by=self.current_production_user)
            event.save()
            notify_stream_status_change(sender=self.current_production_user.user, instance=stream,
                                        created=False)
        return stream


class UserToOfficerForm(forms.ModelForm):
    user = UserModelChoiceField(queryset=get_user_model().objects.filter(
        production_user__isnull=True).order_by('last_name'))

    class Meta:
        model = ProductionUser
        fields = (
            'user',
        )

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['user'].queryset = self.fields['user'].queryset.filter(
            production_user__isnull=True).order_by('last_name')


class ProofsUploadForm(forms.ModelForm):
    class Meta:
        model = Proofs
        fields = ('attachment',)


class ProofsDecisionForm(forms.ModelForm):
    decision = forms.ChoiceField(choices=[(True, 'Accept Proofs for publication'),
                                          (False, 'Decline Proofs for publication')])
    feedback = forms.CharField(required=False, widget=forms.Textarea)
    feedback_attachment = forms.FileField(required=False)

    class Meta:
        model = Proofs
        fields = ()

    def save(self, commit=True):
        proofs = self.instance
        decision = self.cleaned_data['decision']
        comments = self.cleaned_data['feedback']

        if decision in ['True', True]:
            proofs.status = constants.PROOFS_ACCEPTED
            if proofs.stream.status in [constants.PROOFS_PRODUCED,
                                        constants.PROOFS_CHECKED,
                                        constants.PROOFS_SENT,
                                        constants.PROOFS_CORRECTED]:
                # Force status change on Stream if appropriate
                proofs.stream.status = constants.PROOFS_ACCEPTED
        else:
            proofs.status = constants.PROOFS_DECLINED
            proofs.stream.status = constants.PROOFS_RETURNED

        if commit:
            proofs.save()
            proofs.stream.save()

            prodevent = ProductionEvent(
                stream=proofs.stream,
                event='status',
                comments='<em>Received feedback from the authors:</em><br>{comments}'.format(
                    comments=comments),
                noted_by=proofs.stream.supervisor
            )
            prodevent.save()
            if self.cleaned_data.get('feedback_attachment'):
                attachment = ProductionEventAttachment(
                    attachment=self.cleaned_data['feedback_attachment'],
                    production_event=prodevent)
                attachment.save()
        return proofs