BotSample / FactorizationBotApi

MessagesController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using System.Web.Http;
using Microsoft.Bot.Connector;

namespace FactorizationBotApi
{
    [BotAuthentication]
    public class MessagesController : ApiController
    {
        public async Task<HttpResponseMessage> Post([FromBody]Activity activity)
        {
            if (activity.Type != ActivityTypes.Message)
                return Request.CreateResponse(HttpStatusCode.OK);
            if (string.IsNullOrWhiteSpace(activity.Text))
                return Request.CreateResponse(HttpStatusCode.OK);

            var connector = new ConnectorClient(new Uri(activity.ServiceUrl));

            var echoMessage = $"You sent \"{activity.Text}\".";
            await Reply(connector, activity, echoMessage);

            var mainMessage = Factorize(activity.Text);
            await Reply(connector, activity, mainMessage);

            return Request.CreateResponse(HttpStatusCode.OK);
        }

        static string Factorize(string text)
        {
            int i;
            if (!int.TryParse(text, out i)) return "Send an integer.";

            var factorized = MathHelper.Factorize2(Math.Abs(i));
            var factorizedString = string.Join(" · ", factorized.Select(p => $"{p.Key}{(p.Value == 1 ? "" : $"^{p.Value}")}"));
            return $"{i} = {(i >= 0 ? "" : "-")}{factorizedString}";
        }

        static async Task Reply(ConnectorClient connector, Activity activity, string message)
        {
            var reply = activity.CreateReply(message);
            await connector.Conversations.ReplyToActivityAsync(reply);
        }
    }
}