from django import forms
from django.contrib.auth import get_user_model
from crispy_forms.helper import FormHelper
from crispy_forms.layout import Layout, Field
from markdownfield.widgets import MDEWidget
from .widgets import ImagePreviewWidget

from .models import Post, PostCategory
from mptt.forms import TreeNodeChoiceField


User = get_user_model()


class PostCategoryForm(forms.ModelForm):
    class Meta:
        model = PostCategory
        fields = ["name", "slug", "parent", "description"]

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.helper = FormHelper()
        self.helper.form_tag = False
        self.helper.layout = Layout(
            Field("name"),
            Field("slug"),
            Field("parent"),
            Field("description"),
        )

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # Use TreeNodeChoiceField for hierarchical parent selection
        self.fields["parent"] = TreeNodeChoiceField(
            queryset=PostCategory.objects.all(), required=False, level_indicator="— "
        )


class PostForm(forms.ModelForm):
    tags = forms.CharField(label="Tags", required=False, help_text="Comma-separated")

    class Meta:
        model = Post
        fields = [
            "title",
            "slug",
            "category",
            "author",
            "excerpt",
            "feature_image",
            "content",
            "status",
            "published_at",
        ]
        widgets = {
            "published_at": forms.DateTimeInput(attrs={"type": "datetime-local"}),
            "content": MDEWidget(attrs={"rows": 20}),
            "feature_image": ImagePreviewWidget(),
        }

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.helper = FormHelper()
        self.helper.form_tag = False
        self.helper.layout = Layout(
            Field("title"),
            Field("slug"),
            Field("category"),
            Field("author"),
            Field("excerpt"),
            Field("feature_image"),
            Field("content"),
            Field("status"),
            Field("published_at"),
            Field("tags"),
        )
        # Initialize tags from instance
        if self.instance and getattr(self.instance, "pk", None):
            try:
                names = list(self.instance.tags.names())
                self.fields["tags"].initial = ", ".join(names)
            except Exception:
                self.fields["tags"].initial = ""

    def save(self, commit=True):
        obj = super().save(commit)
        tags = [t.strip() for t in self.cleaned_data.get("tags", "").split(",") if t.strip()]
        try:
            if commit:
                obj.tags.set(tags)
        except Exception:
            pass
        return obj