using System;
using System.Collections.Generic;
using System.Linq;
using Nancy;
using Sony.Filtr.AdminAPI.Utility;
using Sony.Filtr.AdminAPI.ViewModels.Graph;
using Sony.Filtr.Contracts.Abstractions;
using Sony.Filtr.Core.Buzz;
using Sony.Filtr.Utility;

namespace Sony.Filtr.AdminAPI.Modules
{
    public class ArtistGraphModule : BaseModule
    {
        public ArtistGraphModule(IApplicationInstanceManager applicationInstanceManager, BuzzArtistManager buzzArtistManager) : base(applicationInstanceManager)
        {
            Get["ArtistFollowersGraph", "/artistGraph/followers", true] = async (parameters, cx) =>
            {
                var artistId = Request.GetRequiredArtistId();

                var startDate = Maybe.ToDateTimeOrFallback((string)Request.Query.startDate, DateTime.Today.AddDays(-30));
                var endDate = Maybe.ToDateTimeOrFallback((string)Request.Query.endDate, DateTime.Today);

                var artistFollowers = await buzzArtistManager.GetSpotifyArtistFollowerLogAsync(artistId, startDate.AddDays(-1), endDate);
                var total = artistFollowers.Skip(1).Select(s => new GraphEntry<int>() { Date = s.Timestamp, Value = s.Followers }).OrderBy(e => e.Date).ToList();
                var change = GraphViewModelHelper.BuildDailyChange(total).ToList();

                List<FollowerSeriesViewModel> series = new List<FollowerSeriesViewModel>
                {
                    new FollowerSeriesViewModel { FollowerType = FollowerStatType.Total.ToString(), Entries = total }, 
                    new FollowerSeriesViewModel { FollowerType = FollowerStatType.DailyChange.ToString(), Entries = change }
                };
                var viewModel = new FollowersGraphViewModel
                {
                    Series = series,
                    Filter = new FollowersFilter()
                    {
                        StartDate = startDate,
                        EndDate = endDate,
                        ArtistId = artistId,
                    }
                };
                return Response.AsJson(viewModel);
            };
        }
    }
}