from django import forms
from .models import Workshop

class SeatsForm(forms.Form):
    seats = forms.IntegerField(min_value=1, max_value=4, label="Seats")

class WorkshopForm(forms.ModelForm):
    class Meta:
        model = Workshop
        fields = ["title", "slug", "venue", "starts_at", "capacity", "remaining"]
    def clean(self):
        data = super().clean()
        if data.get("remaining") is not None and data.get("capacity") is not None:
            if data["remaining"] > data["capacity"]:
                raise forms.ValidationError("Remaining seats cannot exceed capacity.")
        return data

class NoteUploadForm(forms.Form):
    note = forms.FileField(label="Plain-text access note")
    def clean_note(self):
        note = self.cleaned_data["note"]
        if note.size > 2048:
            raise forms.ValidationError("Use a text note under 2048 bytes.")
        try:
            text = note.read().decode("utf-8")
        except UnicodeDecodeError as error:
            raise forms.ValidationError("Use UTF-8 plain text.") from error
        if "\x00" in text or "<" in text:
            raise forms.ValidationError("Use plain text without markup.")
        note.seek(0)
        return note