<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.Twilio" Version="3.0.0" />
  </ItemGroup>
</Project>

#r "System.Runtime"
#r "Newtonsoft.Json"

using System.Net;
using System.Text; 
using System.Linq;
using System.Threading.Tasks;
using Newtonsoft.Json;
using Twilio.TwiML; 

// LUIS classes
public class LuisModel
{
    public string query { get; set; }
    public TopScoringIntent topScoringIntent { get; set; }
    public List<Intent> intents { get; set; }
    public List<Entity> entities { get; set; }
}

public class TopScoringIntent
{
    public string intent { get; set; }
    public double score { get; set; }
}

public class Intent
{
    public string intent { get; set; }
    public double score { get; set; }
}

public class Entity
{
    public string entity { get; set; }
    public string type { get; set; }
    public int startIndex { get; set; }
    public int endIndex { get; set; }
}

// OpenWeatherMap classes
public class WeatherModel
{
    public Coord coord { get; set; }
    public List<Weather> weather { get; set; }
    public string @base { get; set; }
    public Main main { get; set; }
    public int visibility { get; set; }
    public Wind wind { get; set; }
    public Clouds clouds { get; set; }
    public int dt { get; set; }
    public Sys sys { get; set; }
    public int id { get; set; }
    public string name { get; set; }
    public int cod { get; set; }
}

public class Weather
{
    public int id { get; set; }
    public string main { get; set; }
    public string description { get; set; }
    public string icon { get; set; }
}

public class Coord
{
    public double lon { get; set; }
    public double lat { get; set; }
}

public class Main
{
    public double temp { get; set; }
    public double pressure { get; set; }
    public double humidity { get; set; }
    public double temp_min { get; set; }
    public double temp_max { get; set; }
}

public class Wind
{
    public double speed { get; set; }
}

public class Clouds
{
    public double all { get; set; }
}

public class Sys
{
    public int type { get; set; }
    public int id { get; set; }
    public double message { get; set; }
    public string country { get; set; }
    public long sunrise { get; set; }
    public long sunset { get; set; }
}

// Main code
public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log)
{
    var data = await req.Content.ReadAsStringAsync();

    var formValues = data.Split('&') 
        .Select(value => value.Split('='))
        .ToDictionary(pair => Uri.UnescapeDataString(pair[0]).Replace("+", " "), 
                      pair => Uri.UnescapeDataString(pair[1]).Replace("+", " "));

    var text = formValues["Body"].ToString();
    var message = await evaluateMessage(text);
    var response = new MessagingResponse().Message(message);

    var twiml = response.ToString();
    twiml = twiml.Replace("utf-16", "utf-8");

    return new HttpResponseMessage
    { 
        Content = new StringContent(twiml, Encoding.UTF8, "application/xml")
    };
}

private static readonly HttpClient httpClient = new HttpClient();

private static async Task<string> evaluateMessage(string text)
{
    try
    {
        var luisURL = "Your-LUIS-URL-From-Step6-Part1";
        var luisResult = await httpClient.GetStringAsync($"{luisURL}{text});
        var luisModel = JsonConvert.DeserializeObject<LuisModel>(luisResult);

        if (luisModel.topScoringIntent.intent == "GetCityWeather")
        {
            var entity = luisModel.entities.FirstOrDefault();

            if (entity != null)
            {
                if (entity.type == "builtin.geographyV2.city")
                {
                    var city = entity.entity;
                    var apiKey = "Your-OpenWeatherMapKey-From-Step4-Part2";

                    var weatherURL = $"http://api.openweathermap.org/data/2.5/weather?appid={apiKey}&q={city}";

                    var weatherResult = await httpClient.GetStringAsync(weatherURL);
                    var weatherModel = JsonConvert.DeserializeObject<WeatherModel>(weatherResult);
                    weatherModel.main.temp -= 273.15;

                    var weather = $"{weatherModel.weather.First().main} ({weatherModel.main.temp.ToString("N2")} °C)";
                    return $"Weather of {city} is: {weather}";
                }
            }
        }
        else
            return "Sorry, I could not understand you!";
    }
    catch(Exception ex)
    {

    }

    return "Sorry, there was an error!";
}