#!/usr/bin/env python3
from typing import Optional
from flask import jsonify, request, abort, current_app
from utils import json_required, redis_client
from flask_classful import FlaskView

import json


class AssignmentView(FlaskView):

    @staticmethod
    def _resolve_response(site: Optional[str]) -> dict:
        site_url_map = redis_client.get("SITEURLMAP")

        if site_url_map:
            site_url_map = json.loads(site_url_map.decode('utf-8'))

        if not site_url_map:
            return {
                "site": current_app.config['DEFAULT_WHILE_NOT_DEFINED'][0],
                "url": current_app.config['DEFAULT_WHILE_NOT_DEFINED'][1],
                "hard_default": True
            }

        if not site:
            return {
                "site": current_app.config['DEFAULT_WHILE_NOT_DEFINED'][0],
                "url": current_app.config['DEFAULT_WHILE_NOT_DEFINED'][1],
                "hard_default": True
            }

        if site not in site_url_map.keys():
            # This should be an internal server error instead
            return {
                "site": current_app.config['DEFAULT_WHILE_NOT_DEFINED'][0],
                "url": current_app.config['DEFAULT_WHILE_NOT_DEFINED'][1],
                "hard_default": True
            }

        return {
            "site": site,
            "url": site_url_map[site],
            "hard_default": False
        }

    @json_required
    def post(self):
        device_id = request.json['device_id']

        schedule_store_key = f"SCHEDULED:{device_id}"

        target_site = redis_client.get(schedule_store_key)

        if target_site:
            target_site = target_site.decode('utf-8')

        if not target_site:
            default_target = redis_client.get('DEFAULT:SCHEDULED')

            if default_target:
                target_site = default_target.decode('utf-8')
                redis_client.set(schedule_store_key, default_target)

        # Update (or set) TTL
        redis_client.expire(
            schedule_store_key,
            current_app.config['DEVICE_TIMEOUT']
        )

        return jsonify(self._resolve_response(target_site))