using System.Collections.Generic;
using System.Linq;
using Sony.ChartBot.Entities;
using Sony.ChartBot.Entities.MessengerApi;
using Sony.ChartBot.Entities.Storage;
using Sony.ChartBot.Messages.Helpers;

namespace Sony.ChartBot.Messages.MessageBuilders
{
    public class ChartPositionMessageBuilder : IMessageBuilder<IEnumerable<ChartTrackModel>>
    {
        public ResponseType ResponseType => ResponseType.Succeeded;

        public IEnumerable<MessageToSend> BuildMessages(IEnumerable<ChartTrackModel> data)
        {
            var outputBuilder = new ChartPositionOutputBuilder();

            var elements = new List<Element>();

            foreach (var track in data)
            {
                var chartPositionText = outputBuilder.GetChartPositionsOutput(track.Positions, track.Country);

                var buttons = new List<Button>
                {
                    new Button
                    {
                        title = "Next artist",
                        type = "postback",
                        payload = "next"
                    },
                    new Button
                    {
                        title = "Compare",
                        type = "postback",
                        payload = $"compare-{track.TrackReference}"
                    }
                };

                if (track.CurrentUserIsSubscribing ?? false)
                {
                    buttons.Add(new Button
                    {
                        title = "Unsubscribe",
                        type = "postback",
                        payload = $"unsubscribe-{track.TrackReference}"
                    });
                }
                else
                {
                    buttons.Add(new Button
                    {
                        title = "Subscribe",
                        type = "postback",
                        payload = $"subscribe-{track.TrackReference}"
                    });
                }


                var element = new Element
                {
                    title = $"{track.TrackName} by {track.ArtistName}",
                    subtitle = chartPositionText,
                    image_url = track.TrackArtworkUrl ?? track.ArtistArtworkUrl,
                    buttons = buttons
                };

                elements.Add(element);
            }

            return new[]
            {
                new MessageToSend
                {
                    attachment = new Attachment
                    {
                        type = "template",
                        payload = new Payload
                        {
                            template_type = "generic",
                            elements = elements.Take(10)
                        }
                    }
                }
            };
        }
    }
}