from django import forms
from django.contrib.auth.models import User
from django.utils.translation import gettext_lazy as _
from common.models import UserConfig

from .models import Notification, Team


class MultipleFileInput(forms.FileInput):
    """Widget FileInput autorisant la sélection de plusieurs fichiers."""
    allow_multiple_selected = True

    def __init__(self, attrs=None):
        super().__init__(attrs={'multiple': True, 'class': 'form-control', **(attrs or {})})


class MultipleFileField(forms.FileField):
    """Champ fichier acceptant plusieurs fichiers."""
    widget = MultipleFileInput

    def clean(self, data, initial=None):
        # data may be a list (multiple files) or a single file
        if not data:
            return []
        if not isinstance(data, list):
            data = [data]
        return [super(MultipleFileField, self).clean(d, initial) for d in data]


class NotificationCreateForm(forms.Form):
    """Formulaire de création manuelle d'une notification."""

    title = forms.CharField(
        max_length=255,
        label=_("Titre"),
        widget=forms.TextInput(attrs={'class': 'form-control'}),
    )
    content = forms.CharField(
        required=False,
        label=_("Contenu"),
        widget=forms.Textarea(attrs={'class': 'form-control', 'rows': 4}),
    )
    notification_type = forms.ChoiceField(
        choices=Notification.TYPES,
        initial=Notification.TYPE_MESSAGE,
        label=_("Type"),
        widget=forms.Select(attrs={'class': 'form-select'}),
    )
    action_url = forms.CharField(
        required=False,
        max_length=500,
        label=_("Lien d'action (URL)"),
        widget=forms.TextInput(attrs={'class': 'form-control', 'placeholder': '/example/path/'}),
    )
    action_label = forms.CharField(
        required=False,
        max_length=100,
        label=_("Libellé du lien"),
        widget=forms.TextInput(attrs={'class': 'form-control'}),
    )
    expires_at = forms.DateTimeField(
        required=False,
        label=_("Expire le"),
        widget=forms.DateTimeInput(attrs={'class': 'form-control', 'type': 'datetime-local'}),
    )
    attachments = MultipleFileField(
        required=False,
        label=_("Pièces jointes"),
        help_text=_("Photos ou documents (plusieurs fichiers possibles)."),
    )

    # Recipients
    recipient_users = forms.ModelMultipleChoiceField(
        queryset=User.objects.filter(is_active=True).order_by('first_name', 'last_name', 'username'),
        required=False,
        label=_("Destinataires individuels"),
        widget=forms.SelectMultiple(attrs={'class': 'form-select', 'size': '6'}),
    )
    recipient_teams = forms.ModelMultipleChoiceField(
        queryset=Team.objects.all(),
        required=False,
        label=_("Équipes destinataires"),
        widget=forms.SelectMultiple(attrs={'class': 'form-select', 'size': '4'}),
    )

    def clean(self):
        cleaned_data = super().clean()
        users = cleaned_data.get('recipient_users')
        teams = cleaned_data.get('recipient_teams')
        if not users and not teams:
            raise forms.ValidationError(
                _("Veuillez sélectionner au moins un destinataire ou une équipe.")
            )
        return cleaned_data


class TeamForm(forms.ModelForm):
    class Meta:
        model = Team
        fields = ['name', 'description', 'members']
        widgets = {
            'name': forms.TextInput(attrs={'class': 'form-control'}),
            'description': forms.Textarea(attrs={'class': 'form-control', 'rows': 3}),
            'members': forms.SelectMultiple(attrs={'class': 'form-select', 'size': '8'}),
        }


class NotificationReminderSettingsForm(forms.ModelForm):
    class Meta:
        model = UserConfig
        fields = [
            'notification_reminder_enabled',
            'notification_reminder_emails',
            'notification_reminder_delay_hours',
        ]
        widgets = {
            'notification_reminder_enabled': forms.CheckboxInput(
                attrs={'class': 'form-check-input', 'role': 'switch'}
            ),
            'notification_reminder_emails': forms.TextInput(
                attrs={
                    'class': 'form-control rounded-3',
                    'placeholder': _("Ex: email1@exemple.com, email2@exemple.com"),
                }
            ),
            'notification_reminder_delay_hours': forms.NumberInput(
                attrs={'class': 'form-control rounded-3', 'min': 1, 'max': 720}
            ),
        }

    def clean_notification_reminder_emails(self):
        emails_raw = self.cleaned_data.get('notification_reminder_emails', '')
        if not emails_raw:
            return ''
        import re
        from django.core.validators import validate_email
        from django.core.exceptions import ValidationError

        cleaned_emails = []
        for email in re.split(r'[;,]', emails_raw):
            email = email.strip()
            if email:
                try:
                    validate_email(email)
                    cleaned_emails.append(email)
                except ValidationError:
                    raise forms.ValidationError(
                        _("L'adresse e-mail '%(email)s' n'est pas valide.") % {'email': email}
                    )
        return ', '.join(cleaned_emails)