from django import forms
from django.contrib.auth.models import User
from django.db.models import Q
from django.utils.translation import gettext as _
from .models import Task, Project, Comment, Search, TASKSTATE_CHOICES, PROJECTSTATE_OPEN, ModelList
from .search import INDEX_STATES


class TaskForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        # get request from kwargs
        try:
            self.request = kwargs.pop('request')
        except KeyError:
            raise TypeError("needed request object is missing in kwargs")
        plist = self.__projectlist_taskedit__(self.request.user)
        if self.request.POST:
            project = Project.objects.get(id=self.request.POST.get('project'))
        else:
            try:
                project = kwargs.get('instance').project
            except Task.project.RelatedObjectDoesNotExist:
                if len(plist) > 0:
                    project = plist[0]
        # init TaskForm
        super(TaskForm, self).__init__(*args, **kwargs)
        # set projectchoice for project
        self.fields['project'].queryset = plist
        self.fields['project'].empty_label = None
        # set userlist (projectdepending)
        self.fields['assigned_user'].empty_label = _('----- choose a user -----')
        if project is not None:
            self.fields['assigned_user'].queryset = self.__userlist_taskedit__(self.request.user, project)

    def __projectlist_taskedit__(self, user):
        if user.is_superuser:
            rv = Project.objects.all()
        else:
            rv = Project.objects.filter(
                Q(role_leader__id__exact=user.id) | Q(role_member__id__exact=user.id),
                state=PROJECTSTATE_OPEN,
            ).distinct()
        rv = ModelList(rv)
        rv.sort()
        return Project.objects.filter(pk__in=[p.pk for p in rv])

    def __userlist_taskedit__(self, user, project=None):
        if user.is_superuser:
            return User.objects.all().order_by('username')
        elif user in project.role_leader.all():
            uids = [u.id for u in project.role_leader.all() | project.role_member.all()]
        else:
            uids = [user.id]
        return User.objects.filter(id__in=set(uids)).order_by('username')

    class Meta:
        model = Task
        fields = ['project', 'assigned_user', 'name', 'state', 'priority', 'targetdate', 'progress', 'description']
        widgets = {
            'assigned_user': forms.Select(attrs={'required': True}),
            'project': forms.Select(attrs={'onchange': 'submit()'}),
            'state': forms.Select(choices=TASKSTATE_CHOICES),
            'targetdate': forms.DateInput(format="%Y-%m-%d"),
            'description': forms.Textarea(attrs={'rows': 5}),
        }


class TaskFormLimited(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        # remove request from kwargs
        kwargs.pop('request')
        super(TaskFormLimited, self).__init__(*args, **kwargs)

    class Meta:
        model = Task
        fields = ['state', 'progress', 'description']
        widgets = {
            'state': forms.Select(choices=TASKSTATE_CHOICES[:2]),
            'description': forms.Textarea(attrs={'rows': 5}),
        }


class ProjectForm(forms.ModelForm):
    class Meta:
        model = Project
        fields = ['name', 'state', 'role_leader', 'role_member', 'role_visitor', 'description', 'days_late', 'days_very_soon', 'days_soon']
        widgets = {
            'description': forms.Textarea(attrs={'rows': 5}),
        }
        labels = {
            'days_late': _('Days to deadline (late)'),
            'days_very_soon': _('Days to deadline (very soon)'),
            'days_soon': _('Days to deadline (soon)'),
        }

    def __init__(self, *args, **kwargs):
        super(ProjectForm, self).__init__(*args, **kwargs)
        self.fields['role_leader'].queryset = User.objects.order_by('username')
        self.fields['role_member'].queryset = User.objects.order_by('username')


class CommentForm(forms.ModelForm):
    class Meta:
        model = Comment
        fields = ['comment']


class TaskCommentForm(forms.ModelForm):
    class Meta:
        model = Comment
        fields = ['comment']

    def __init__(self, *args, **kwargs):
        super(forms.ModelForm, self).__init__(*args, **kwargs)
        self.fields['comment'].required = False


class SearchForm(forms.ModelForm):
    class Meta:
        model = Search
        fields = ['name', 'search_txt']
        labels = {
            'search_txt': _('Search Text'),
        }


class EasySearchForm(forms.Form):
    user_ids = forms.MultipleChoiceField(required=False, label=_('Assigned User(s)'), widget=forms.widgets.SelectMultiple(attrs={'size': 6}))
    states = forms.MultipleChoiceField(required=False, label=_('State(s)'))
    prj_ids = forms.MultipleChoiceField(required=False, label=_('Project(s)'), widget=forms.widgets.SelectMultiple(attrs={'size': 10}))

    def __init__(self, *args, **kwargs):
        super(EasySearchForm, self).__init__(*args, **kwargs)
        self.fields['user_ids'].choices = [(u.id, u.username) for u in User.objects.order_by('username')]
        self.fields['states'].choices = [(INDEX_STATES.get(task_num), task_name) for task_num, task_name in TASKSTATE_CHOICES]
        self.fields['prj_ids'].choices = [(p.id, p.name) for p in Project.objects.order_by('state', 'name')]