from django.shortcuts import render
from django.views.generic import TemplateView
from model_client import url_image_vars
from sample_loader import get_random_sample_image
from .forms import ImageUploadForm, URLInputForm
from base64 import b64encode


def get_default_form_context():
    return {
        "url_form": URLInputForm(),
        "image_form": ImageUploadForm(),
    }


class HomeView(TemplateView):
    template_name = "index.html"

    def render_for_img_url_label(self, request, img_url: str, label: str):
        img_src = img_url
        top_guesses, color_labels = url_image_vars(img_url, label)
        context_dict = get_default_form_context()
        context_dict.update(
            {
                "img_src": img_src,
                "top_guesses": top_guesses,
                "actual_label": label or "Unknown",
                "color_labels": color_labels,
            }
        )
        return render(request, "request.html", context_dict)

    def render_for_img_file_label(self, request, img_file, label: str):
        decoded_img = b64encode(img_file.read()).decode("utf-8")
        img_src = f"data:{img_file.content_type};base64,{decoded_img}"
        top_guesses, color_labels = url_image_vars(img_file, label)
        context_dict = get_default_form_context()
        context_dict.update(
            {
                "top_guesses": top_guesses,
                "actual_label": label or "Unknown",
                "color_labels": color_labels,
                "img_src": img_src,
            }
        )
        return render(request, "request.html", context_dict)

    def get(self, request):
        context_dict = get_default_form_context()
        return render(request, self.template_name, context_dict)

    def post(self, request):
        action = request.POST["action"]
        context_dict = get_default_form_context()
        if action == "SubmitURL":
            form = URLInputForm(request.POST)
            if form.is_valid():
                img_url = form.cleaned_data["post"]
                label = form.cleaned_data["label"]
                return self.render_for_img_url_label(request, img_url, label)

        if action == "SubmitImage":
            form = ImageUploadForm(request.POST, request.FILES)
            assert form.is_valid()
            if form.is_valid():
                image_field = form.cleaned_data["img"]
                label = form.cleaned_data["label"]
                return self.render_for_img_file_label(request, image_field, label)

        if action == "LoadRandom":
            img_url, label = get_random_sample_image()
            return self.render_for_img_url_label(request, img_url, label)
        return render(request, self.template_name, context_dict)