import time
from collections import namedtuple

import psutil
from django.views.generic import TemplateView
from humanize import naturalsize

from sdbs_infra.dashboard.models import Service


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

    def get_context_data(self, **kwargs):
        return {
            'services': Service.objects.all(),
            'vps_stats': self.vps_stats()
        }

    # noinspection PyListCreation
    @staticmethod
    def vps_stats():
        stats = []

        stats.append(f"<em>LOAD AVG:</em> {', '.join(map(str, psutil.getloadavg()))}")

        memory = psutil.virtual_memory()
        stats.append(
            f"<em>MEM:</em> {naturalsize(memory.used)}/{naturalsize(memory.total)} ({memory.percent}% USED)"
        )

        disk = psutil.disk_usage('/')
        stats.append(
            f"<em>DISK:</em> {naturalsize(disk.used)}/{naturalsize(disk.total)} ({disk.percent}% USED)"
        )

        uptime = normalize_seconds(time.time() - psutil.boot_time())

        stats.append(
            f"<em>UPTIME:</em> {int(uptime.days)} days, {int(uptime.hours)} hours, {int(uptime.minutes)} minutes"
        )

        return " / ".join(map(lambda stat: stat.replace(" ", "&nbsp;"), stats))


def normalize_seconds(seconds: int):
    (days, remainder) = divmod(seconds, 86400)
    (hours, remainder) = divmod(remainder, 3600)
    (minutes, seconds) = divmod(remainder, 60)

    return namedtuple("_", ("days", "hours", "minutes", "seconds"))(days, hours, minutes, seconds)