from datetime import timedelta
from django.utils import timezone
from django.shortcuts import render
from .models import Visit


def _get_server_info():
    try:
        with open('/proc/uptime') as f:
            total_seconds = int(float(f.read().split()[0]))
        days, rem = divmod(total_seconds, 86400)
        hours, mins = divmod(rem, 3600)
        uptime = f"{days}d {hours}h {mins // 60}m"
    except Exception:
        uptime = 'N/A'

    try:
        with open('/proc/loadavg') as f:
            parts = f.read().split()
        load = f"{parts[0]}  {parts[1]}  {parts[2]}"
    except Exception:
        load = 'N/A'

    try:
        meminfo = {}
        with open('/proc/meminfo') as f:
            for line in f:
                key, val = line.split(':')
                meminfo[key.strip()] = int(val.split()[0])
        mem_total = meminfo['MemTotal'] // 1024
        mem_free  = meminfo['MemAvailable'] // 1024
        mem_used  = mem_total - mem_free
    except Exception:
        mem_total = mem_free = mem_used = 0

    return {
        'uptime': uptime,
        'load': load,
        'mem_total': mem_total,
        'mem_free': mem_free,
        'mem_used': mem_used,
    }


def index(request):
    forwarded = request.META.get('HTTP_X_FORWARDED_FOR', '')
    ip = forwarded.split(',')[0].strip() if forwarded else request.META.get('REMOTE_ADDR', 'unknown')

    Visit.objects.create(ip=ip)

    now = timezone.now()
    start_of_day = now.replace(hour=0, minute=0, second=0, microsecond=0)

    context = {
        'visitor_ip': ip,
        'visits_today': Visit.objects.filter(timestamp__gte=start_of_day).count(),
        'visits_week':  Visit.objects.filter(timestamp__gte=now - timedelta(days=7)).count(),
        'visits_month': Visit.objects.filter(timestamp__gte=now - timedelta(days=30)).count(),
        **_get_server_info(),
    }
    return render(request, 'core/index.html', context)