from django import forms

from .models import Item, ItemNote, ItemTemplate


class ItemTemplateForm(forms.ModelForm):
    class Meta:
        model = ItemTemplate
        fields = [
            "name",
            "description",
            "category",
            "field_definitions",
            "default_purchase_price",
            "default_estimated_resale_price",
            "default_notes",
            "is_active",
        ]
        widgets = {
            "field_definitions": forms.Textarea(attrs={"rows": 4, "placeholder": '[{"name":"rewind","label":"Rewind?","type":"boolean"}]'}),
        }

    def clean_field_definitions(self):
        raw = self.cleaned_data.get("field_definitions")
        # Allow users to provide a JSON string or a python list
        if raw in (None, ""):
            return []

        if isinstance(raw, str):
            import json

            try:
                parsed = json.loads(raw)
            except Exception as e:
                raise forms.ValidationError("Invalid JSON for field_definitions: %s" % e)
        else:
            parsed = raw

        if not isinstance(parsed, list):
            raise forms.ValidationError("field_definitions must be a JSON list of field descriptors")

        # Basic validation for each field descriptor
        for entry in parsed:
            if not isinstance(entry, dict) or "name" not in entry or "type" not in entry:
                raise forms.ValidationError("Each field definition must be an object with at least 'name' and 'type'")

        return parsed


class ItemForm(forms.ModelForm):
    class Meta:
        model = Item
        fields = [
            "template",
            "title",
            "brand",
            "category",
            "condition",
            "size",
            "color",
            "purchase_price",
            "estimated_resale_price",
            "notes",
        ]

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields["category"].required = False
        self.fields["purchase_price"].required = False
        self.fields["estimated_resale_price"].required = False

    def clean(self):
        cleaned_data = super().clean()
        template = cleaned_data.get("template")

        if not cleaned_data.get("category") and not template:
            self.add_error("category", "Category is required when no template is selected.")
        if cleaned_data.get("purchase_price") in (None, "") and not template:
            self.add_error("purchase_price", "Purchase price is required when no template is selected.")

        return cleaned_data


class ItemSoldForm(forms.ModelForm):
    class Meta:
        model = Item
        fields = ["sold_price", "ebay_fee", "shipping_cost", "sold_at"]


class ItemNoteForm(forms.ModelForm):
    class Meta:
        model = ItemNote
        fields = ["body"]


class ItemFilterForm(forms.Form):
    query = forms.CharField(required=False)
    status = forms.ChoiceField(required=False, choices=[("", "All")])
    category = forms.CharField(required=False)
    created_by = forms.CharField(required=False)
    min_purchase_price = forms.DecimalField(required=False, min_value=0)
    max_purchase_price = forms.DecimalField(required=False, min_value=0)
    min_profit = forms.DecimalField(required=False)

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields["status"].choices = [("", "All")] + list(Item.Status.choices)