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

namespace Sony.Filtr.AdminAPI.Modules
{
    public class UserGraphModule : BaseModule
    {
        private readonly BuzzAccountManager _buzzAccountManager;
        private readonly SpotifyUserFollowersManager _spotifyUserFollowersManager;

        public UserGraphModule(IApplicationInstanceManager applicationInstanceManager, BuzzAccountManager buzzAccountManager, SpotifyUserFollowersManager spotifyUserFollowersManager) : base(applicationInstanceManager)
        {
            _buzzAccountManager = buzzAccountManager;
            _spotifyUserFollowersManager = spotifyUserFollowersManager;
            Get["UserFollowersGraph", "/userGraph/followers", true] = async (parameters, cx) =>
            {
                string userUri = (string)Request.Query.userUri;

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

                if (string.IsNullOrWhiteSpace(userUri))
                    return HttpStatusCode.BadRequest;

                var username = new SpotifyLink(userUri).ExtractSpotifyUserName();
                if (string.IsNullOrWhiteSpace(username))
                    return HttpStatusCode.BadRequest;

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

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

    }
    
}