from uuid import uuid4

from celery.result import AsyncResult
from django.core.paginator import Paginator
from django.http import (
    HttpResponseRedirect,
    HttpResponseServerError,
    HttpResponseBadRequest,
)
from django.shortcuts import render, get_object_or_404

from deployment.forms import DeploymentForm
from deployment.models import Deployment, Status
from deployment.tasks import deploy as launch_deploy


def index(request):
    deployments = Deployment.objects.filter(user=request.user.id).order_by(
        "-created_at"
    )
    paginator = Paginator(deployments, 10)

    page_number = request.GET.get("page")
    page_obj = paginator.get_page(page_number)

    return render(
        request,
        "deployment/board.html",
        {
            "page_obj": page_obj,
            "range_pages": [i + 1 for i in range(page_obj.paginator.num_pages)],
            "url": "events/",
        },
    )


def deploy(request, deployment_id):
    deployment = get_object_or_404(Deployment, id=deployment_id)

    if request.method == "POST":
        # override previous errors
        if deployment.error:
            deployment.error = None

        deployment.status = Status.PENDING.name
        deployment.save()
        launch_deploy.delay(deployment_id)

    if page := request.GET.get("page", ""):
        return HttpResponseRedirect(f"/deployment?page={page}")

    return HttpResponseRedirect("/deployment")


def details(request, deployment_id):
    deployment = get_object_or_404(Deployment, id=deployment_id)
    if deployment.status == Status.RUNNING.name:
        # retrieve the progression in the backend task
        res = AsyncResult(str(deployment.task_id))
        deployment.progress = res.info.get("progress", 0)

    if request.method == "POST":
        if deployment.status == Status.RUNNING.name:
            return HttpResponseBadRequest("deployment is running")

        if deployment.status == Status.PENDING.name:
            return HttpResponseBadRequest("deployment is pending")

        try:
            deployment.delete()
        except Exception as e:
            return HttpResponseServerError(e)
        return HttpResponseRedirect("/deployment")

    return render(
        request,
        "deployment/details.html",
        {"deployment": deployment, "url": f"{deployment.id}/events/"},
    )


def create(request):
    if request.method == "POST":
        form = DeploymentForm(request.POST)
        if form.is_valid():
            try:
                Deployment.objects.create(
                    user=request.user, id=uuid4(), **form.cleaned_data
                )
            except Exception as e:
                return HttpResponseServerError(e)

    return HttpResponseRedirect("/deployment")