from . import renderers
from django.urls import reverse
from django.shortcuts import render, get_object_or_404
from django.http import HttpResponseRedirect, HttpResponse
from django.views.decorators.csrf import csrf_exempt
from .models import Paste, Language
from .forms import PasteForm

from webtools import settings


@csrf_exempt
def index(request):
    """Displays form."""
    data = {"menu": "index", "max_characters": settings.PASTE["max_characters"]}
    if request.method == "POST":
        paste = Paste()
        paste.choose_slug()
        if request.FILES:
            for language_name, any_file in request.FILES.items():
                break
            language = Language.by_name(language_name)
            form = PasteForm(
                {
                    "language": language.id,
                    "content": any_file.read().decode(),
                },
                instance=paste,
            )
        else:
            form = PasteForm(request.POST, instance=paste)
        if not form.is_valid():
            data["form"] = form
            return render(request, "paste/index.html", data)
        form.save()  # Some logic added to overrided method, see forms.py
        location = request.build_absolute_uri(
            reverse("short_paste", kwargs={"slug": paste.slug})
        )
        return HttpResponseRedirect(
            location, content=location + "\n", content_type="text/plain"
        )
    data["form"] = PasteForm(
        initial={
            "language": Language.by_name(settings.PASTE["default_language"]).id,
        }
    )
    data["absolute_index_url"] = request.build_absolute_uri(reverse("index"))
    return render(request, "paste/index.html", data)


def show(request, slug, renderer="pygments"):
    """Display paste."""
    # Fetching object
    paste = get_object_or_404(Paste, slug=slug)
    data = {"slug": slug}
    # Handling expiration
    # Before rendering actions
    paste.incr_viewcount()
    # Handling rendering modes
    if not renderer or renderer not in settings.PASTE["enabled_renderers"]:
        renderer = settings.PASTE["default_renderer"]
    data["current_renderer"] = renderer
    data["renderers"] = settings.PASTE["enabled_renderers"]
    render_method = getattr(renderers, "render_%s" % renderer)
    return render_method(request, paste, data)