using System.Net;
using System.Threading.Tasks;
using System.Web.Mvc;
using CallTracking.Web.Domain.Twilio;
using CallTracking.Web.Models;
using CallTracking.Web.Models.Repository;
using HttpStatusCodeResult = System.Web.Mvc.HttpStatusCodeResult;

namespace CallTracking.Web.Controllers
{
    public class LeadSourcesController : Controller
    {
        private readonly IRepository<LeadSource> _repository;
        private readonly IRestClient _restClient;

        public LeadSourcesController()
            : this(new LeadSourcesRepository(), new RestClient()) { }

        public LeadSourcesController(IRepository<LeadSource> repository, IRestClient restClient)
        {
            _repository = repository;
            _restClient = restClient;
        }

        // POST: LeadSources/Create
        [HttpPost]
        public async Task<ActionResult> Create(string phoneNumber)
        {
            var twiMLApplicationSid = Credentials.TwiMLApplicationSid ?? await _restClient.GetApplicationSidAsync();
            var twilioNumber = await _restClient.PurchasePhoneNumberAsync(phoneNumber, twiMLApplicationSid);

            var leadSource = new LeadSource
            {
                IncomingNumberNational = twilioNumber.FriendlyName,
                IncomingNumberInternational = twilioNumber.PhoneNumber?.ToString()
            };

            _repository.Create(leadSource);

            return RedirectToAction("Edit", new {id = leadSource.Id});
        }

        // GET: LeadSources/Edit/5
        public ActionResult Edit(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }

            var leadSource = _repository.Find(id.Value);
            if (leadSource == null)
            {
                return HttpNotFound();
            }

            return View(leadSource);
        }

        // POST: LeadSources/Edit/
        [HttpPost]
        public ActionResult Edit(
            [Bind(Include = "Id,Name,IncomingNumberNational,IncomingNumberInternational,ForwardingNumber")]
            LeadSource leadSource)
        {
            if (ModelState.IsValid)
            {
                _repository.Update(leadSource);
                return RedirectToAction("Index", new { Controller = "Dashboard" });
            }

            return View(leadSource);
        }
    }
}

class LeadSourcesController < ApplicationController
  before_filter :find_lead_source, only: [:edit, :update]

  def edit
  end

  def create
    phone_number = params[:format]
    twilio_number = TwilioClient.purchase_phone_number(phone_number)
    lead_source = LeadSource.create(name: '', incoming_number: twilio_number.friendly_name)

    message  = "Phone number #{twilio_number.friendly_name} has been purchased. Please add a name for this lead source"
    redirect_to edit_lead_source_path(lead_source), notice: message
  end

  def update
    if @lead_source.update_attributes(lead_sources_params)
      redirect_to root_url, notice: 'Lead source successfully updated.'
    end
  end

  private

  def find_lead_source
    @lead_source = LeadSource.find(params[:id])
  end

  def lead_sources_params
    params.require(:lead_source).permit(:name, :forwarding_number)
  end
end

from django.contrib import messages
from django.contrib.messages.views import SuccessMessageMixin
from django.urls import reverse_lazy
from django.http import HttpResponse, JsonResponse
from django.shortcuts import render, redirect
from django.template.context_processors import csrf
from django.views.decorators.csrf import csrf_exempt
from django.views.generic.base import TemplateView
from django.views.generic.edit import UpdateView
from twilio.twiml.voice_response import VoiceResponse

from .forms import AreaCodeForm, PurchaseNumberForm
from .models import LeadSource, Lead
from .utils import search_phone_numbers, purchase_phone_number


# Home page view and JSON views to power the charts
def home(request):
    """Renders the home page"""
    context = {}

    # Add the area code form - default to 415
    context['form'] = AreaCodeForm({'area_code': '415'})

    # Add the list of lead sources
    context['lead_sources'] = LeadSource.objects.all()

    return render(request, 'index.html', context)


def leads_by_source(request):
    """Returns JSON data about the lead sources and how many leads they have"""
    # Invoke a LeadSource classmethod to get the data
    data = LeadSource.objects.get_leads_per_source()

    # Return it as JSON - use safe=False because we're sending a JSON array
    return JsonResponse(data, safe=False)


def leads_by_city(request):
    """Returns JSON data about the different cities leads come from"""
    # Invoke a Lead classmethod to get the data
    data = Lead.objects.get_leads_per_city()

    # Return it as JSON - use safe=False because we're sending a JSON array
    return JsonResponse(data, safe=False)


# Views for purchase number workflow
def list_numbers(request):
    """Uses the Twilio API to generate a list of available phone numbers"""
    form = AreaCodeForm(request.POST)

    if form.is_valid():
        # We received a valid area code - query the Twilio API
        area_code = form.cleaned_data['area_code']

        available_numbers = search_phone_numbers(area_code=area_code)

        # Check if there are no numbers available in this area code
        if not available_numbers:
            messages.error(
                request,
                'There are no Twilio numbers available for area code {0}. Search for numbers in a different area code.'.format(area_code))
            return redirect('home')

        context = {}
        context['available_numbers'] = available_numbers

        return render(request, 'call_tracking/list_numbers.html', context)
    else:
        # Our area code was invalid - flash a message and redirect back home
        bad_area_code = form.data['area_code']
        messages.error(request, '{0} is not a valid area code. Please search again.'
                       .format(bad_area_code))

        return redirect('home')


def purchase_number(request):
    """Purchases a new phone number using the Twilio API"""
    form = PurchaseNumberForm(request.POST)

    if form.is_valid():
        # Purchase the phone number
        phone_number = form.cleaned_data['phone_number']
        twilio_number = purchase_phone_number(phone_number.as_e164)

        # Save it in a new LeadSource object
        lead_source = LeadSource(incoming_number=twilio_number.phone_number)
        lead_source.save()

        messages.success(
            request,
            'Phone number {0} has been purchased. Please add a name for this lead source.'.format(
                twilio_number.friendly_name))

        # Redirect to edit lead page
        return redirect('edit_lead_source', pk=lead_source.pk)
    else:
        # In the unlikely event of an error, redirect to the home page
        bad_phone_number = form.data['phone_number']
        messages.error(request, '{0} is not a valid phone number. Please search again.'
                       .format(bad_phone_number))

        return redirect('home')


class LeadSourceUpdateView(SuccessMessageMixin, UpdateView):
    """Powers a form to edit Lead Sources"""

    model = LeadSource
    fields = ['name', 'forwarding_number']
    success_url = reverse_lazy('home')
    success_message = 'Lead source successfully updated.'


# View used by Twilio API to connect callers to the right forwarding
# number for that lead source
@csrf_exempt
def forward_call(request):
    """Connects an incoming call to the correct forwarding number"""
    # First look up the lead source
    source = LeadSource.objects.get(incoming_number=request.POST['Called'])

    # Create a lead entry for this call
    lead = Lead(
        source=source,
        phone_number=request.POST['Caller'],
        city=request.POST['CallerCity'],
        state=request.POST['CallerState'])
    lead.save()

    # Respond with some TwiML that connects the caller to the forwarding_number
    r = VoiceResponse()
    r.dial(source.forwarding_number.as_e164)

    return HttpResponse(r)

package com.twilio.calltracking.servlets.leadsources;

import com.twilio.calltracking.lib.Config;
import com.twilio.calltracking.lib.services.TwilioServices;
import com.twilio.calltracking.models.LeadSource;
import com.twilio.calltracking.repositories.LeadSourceRepository;
import com.twilio.calltracking.servlets.WebAppServlet;
import com.twilio.rest.api.v2010.account.incomingphonenumber.Local;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Objects;

public class CreateServlet extends WebAppServlet {

    private LeadSourceRepository leadSourceRepository;
    private TwilioServices twilioServices;

    @SuppressWarnings("unused")
    public CreateServlet() {
        this(new LeadSourceRepository(), new TwilioServices());
    }

    public CreateServlet(LeadSourceRepository leadSourceRepository, TwilioServices twilioServices) {
        this.leadSourceRepository = leadSourceRepository;
        this.twilioServices = twilioServices;
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String phoneNumber = request.getParameter("phoneNumber");

        String twimlApplicationSid = Config.getTwimlApplicationSid();
        if (Objects.equals(twimlApplicationSid, "") || (twimlApplicationSid == null)) {
            twimlApplicationSid = twilioServices.getApplicationSid();
        }

        Local twilioNumber = twilioServices.purchasePhoneNumber(phoneNumber, twimlApplicationSid);

        LeadSource leadSource = leadSourceRepository.create(new LeadSource(
                twilioNumber.getFriendlyName(),
                twilioNumber.getPhoneNumber().toString()));

        response.sendRedirect(String.format("/leadsources/edit?id=%s", leadSource.getId()));
    }
}

<?php

namespace App\Http\Controllers;

use App\Http\Requests;
use App\LeadSource;
use Illuminate\Http\Request;
use Twilio\Rest\Client;

class LeadSourceController extends Controller
{

    /**
     * Twilio Client
     */
    protected $_twilioClient;

    public function __construct(Client $twilioClient)
    {
        $this->_twilioClient = $twilioClient;
    }

    /**
     * Store a new lead source (i.e phone number) and redirect to edit
     * page
     *
     * @param  Request $request
     * @return Response
     */
    public function store(Request $request)
    {
        $appSid = $this->_appSid();

        $phoneNumber = $request->input('phoneNumber');

        $this->_twilioClient->incomingPhoneNumbers
            ->create(
                [
                    "phoneNumber" => $phoneNumber,
                    "voiceApplicationSid" => $appSid,
                    "voiceCallerIdLookup" => true
                ]
            );

        $leadSource = new LeadSource(
            [
                'number' => $phoneNumber
            ]
        );
        $leadSource->save();

        return redirect()->route('lead_source.edit', [$leadSource]);
    }

    /**
     * Show the form for editing a lead source
     *
     * @param  int $id
     * @return Response
     */
    public function edit($id)
    {
        $leadSourceToEdit = LeadSource::find($id);

        return response()->view(
            'lead_sources.edit',
            ['leadSource' => $leadSourceToEdit]
        );
    }

    /**
     * Update the lead source in storage.
     *
     * @param  Request $request
     * @param  int $id
     * @return Response
     */
    public function update(Request $request, $id)
    {
        $this->validate(
            $request,
            [
                'forwarding_number' => 'required',
                'description' => 'required'
            ]
        );

        $leadSourceToUpdate = LeadSource::find($id);
        $leadSourceToUpdate->fill($request->all());
        $leadSourceToUpdate->save();

        return redirect()->route('dashboard');
    }

    /**
     * Remove the lead source from storage and release the number
     *
     * @param  int $id
     * @return Response
     */
    public function destroy($id)
    {
        $leadSourceToDelete = LeadSource::find($id);
        $phoneToDelete = $this->_twilioClient->incomingPhoneNumbers
            ->read(
                [
                    "phoneNumber" => $leadSourceToDelete->number
                ]
            );

        if ($phoneToDelete) {
            $phoneToDelete[0]->delete();
        }
        $leadSourceToDelete->delete();

        return redirect()->route('dashboard');
    }

    /**
     * The Twilio TwiML App SID to use
     * @return string
     */
    private function _appSid()
    {
        $appSid = config('app.twilio')['TWILIO_APP_SID'];
        if (isset($appSid)) {
            return $appSid;
        }

        return $this->_findOrCreateCallTrackingApp();
    }

    private function _findOrCreateCallTrackingApp()
    {
        $existingApp = $this->_twilioClient->applications->read(
            array(
                "friendlyName" => 'Call tracking app'
            )
        );
        if ($existingApp) {
            return $existingApp[0]->sid;
        }

        $newApp = $this->_twilioClient->applications
            ->create('Call tracking app');

        return $newApp->sid;
    }
}