from datetime import datetime

import pytz
import tornado

from core.config import ALLOW_SPOTTING
from core.constants import SOFTWARE_VERSION
from core.prometheus_metrics_handler import page_requests_counter


# Handler for all HTML pages generated from templates
class PageTemplateHandler(tornado.web.RequestHandler):
    def initialize(self, template_name, web_server_metrics):
        self.template_name = template_name
        self.web_server_metrics = web_server_metrics

    def get(self):
        # Metrics
        self.web_server_metrics["last_page_access_time"] = datetime.now(pytz.UTC)
        self.web_server_metrics["page_access_counter"] += 1
        self.web_server_metrics["status"] = "OK"
        page_requests_counter.inc()

        # Load named template, and provide variables used in templates
        self.render(self.template_name + ".html", software_version=SOFTWARE_VERSION, allow_spotting=ALLOW_SPOTTING)