import os
import logging

import trafaret

from pathlib import Path
from flask import Flask
from flask import render_template
from flask import request
from flask import redirect
from flask import abort


class Web:
    def __init__(self, handler, debug=False):
        self.logger = logging.getLogger(self.__class__.__name__)
        self.app = None
        self.host = None
        self.port = None
        self.handler = handler
        self.debug = debug

    def start_up(self):
        self.init()
        self.app.run(host=self.host, port=self.port, debug=self.debug)

    def init(self):
        self.app = Flask(__name__)
        self.setup_routes()

    def setup_routes(self):
        self.app.add_url_rule('/', '/', self.handler.index,
                         methods=['GET'])
        self.app.add_url_rule('/shortenit', '/shortenit', self.handler.shortenit,
                          methods=['POST'])
        self.app.add_url_rule('/<identifier>', '/identifier', self.handler.short_redirect,
                         methods=['GET'])


class SiteHandler:
    def __init__(self, configuration, database, shorten_url, lenghten_url):
        self.logger = logging.getLogger(self.__class__.__name__)
        self.configuration = configuration
        self.database = database
        self.shorten_url = shorten_url
        self.lenghten_url = lenghten_url
        self.shortenit_load_format = trafaret.Dict({
            trafaret.Key('url'): trafaret.URL,
            trafaret.Key('timestamp'): trafaret.Int
            })

    def shortenit(self):
        data = request.get_json()
        try:
            data = self.shortenit_load_format(data)
        except Exception as e:
            self.logger.error(e)
            return {}, 400
            self.logger.error(e)
            abort(400)
        try:
            short_url = self.shorten_url(
                self.configuration, self.database,
                data['url'], data['timestamp'])
        except KeyError as e:
            self.logger.error(e)
            abort(400)
        self.logger.debug(short_url)
        return {"url": short_url}

    def short_redirect(self, identifier):
        url = self.lenghten_url(self.database, identifier)
        self.logger.debug("The URL is...")
        self.logger.debug(url)
        if not url:
            abort(404)
        return redirect(url)

    def index(self):
        return render_template('index.html')