#nullable enable

using BotFramework.Attributes;
using BotFramework.Enums;
using Kruzya.TelegramBot.Core.Data;
using Kruzya.TelegramBot.Core.Extensions;
using Kruzya.TelegramBot.Core.Handler;
using Kruzya.TelegramBot.Core.Service;
using Microsoft.Extensions.DependencyInjection;
using Telegram.Bot;
using Telegram.Bot.Types.Enums;
using Telegram.Bot.Types.ReplyMarkups;
using West.TelegramBot.ContentStore.Service;

namespace West.TelegramBot.ContentStore.Handler;

public class Store : CommonHandler
{
    private readonly IReputation? _reputation;
    private readonly IServiceProvider _provider;
    private readonly ContentStore _store;
    
    public Store(CoreContext db, IServiceProvider provider, ContentStore store) : base(db)
    {
        _reputation = provider.GetService<IReputation>();
        _provider = provider;
        _store = store;
    }

    [InChat(InChat.Public)]
    [Command("store", CommandParseMode.Both)]
    public async Task HandleStore()
    {
        if (From.IsBot)
        {
            return;
        }

        if (_reputation == null)
        {
            await Bot.SendTextMessageAsync(Chat.Id, "Reputation is unavailable.");
            return;
        }

        var user = From;
        var reputation = await _reputation.GetUserReputationAsync(Chat, user);
        
        await Bot.SendTextMessageAsync(Chat.Id, $"<b>{user.ToHtml()} ({reputation})</b>, чего пожелаете?", parseMode: ParseMode.Html,
            replyMarkup: new InlineKeyboardMarkup(
                _provider.GetServices<IRandomMediaService>()
                    .ToAsyncEnumerable()
                    .WhereAwait(async x => await x.CanView(Chat, user))
                    .OrderBy(x => x.StoreItem.Order)
                    .Select(x => x.StoreItem.ToButton(From.Id))
                    .ToEnumerable()
                    .Chunk(2)
                    .ToList()
                )
        );
    }

    [InChat(InChat.Public)]
    [Update(UpdateFlag.CallbackQuery)]
    public async Task HandleStoreCallback()
    {
        var query = CallbackQuery;
        var queryData = query.Data;
        if (queryData == null || !queryData.StartsWith("store|") || _reputation == null)
        {
            return;
        }

        var paramList = queryData.Split('|');
        if (!long.TryParse(paramList[1], out var senderId))
        {
            return;
        }

        if (senderId != From.Id)
        {
            await AnswerQuery(query.Id, "Keyboard called by another user.");
            return;
        }

        var answer = "Unknown action.";
        if (paramList[2] == "purchase")
        {
            var purchaseType = paramList[3];
            answer = "Спасибо за покупку";
            
            if (!TryGetMediaService(purchaseType, out var mediaService))
            {
                await AnswerQuery(query.Id, "Unknown purchasable.");
                return;
            }

            var storeItem = mediaService!.StoreItem;
            var messageId = query.Message!.MessageId;
            var reputation = await _reputation.GetUserReputationAsync(Chat, From);
            if (reputation < storeItem.Price)
            {
                await Bot.EditMessageTextAsync(
                    Chat.Id, 
                    messageId, 
                    $"<b>{From.ToHtml()} ({reputation})</b>, продолжай работать и тебе обязательно хватит на покупку.",
                    ParseMode.Html);
                await AnswerQuery(query.Id);
                return;
            }

            try
            {
                await PerformPurchase(mediaService, messageId);
            }
            catch (Exception)
            {
                answer = "Товар недоступен";
                await Bot.EditMessageTextAsync(Chat.Id,
                    messageId,
                    $"<b>{From.ToHtml()} попытался купить \"{storeItem.Name}\", но товара в наличии не оказалось.",
                    ParseMode.Html);
                await AnswerQuery(query.Id, answer);
                return;
            }

            reputation = await _reputation.SetUserReputationAsync(Chat, From, reputation - storeItem.Price);
            await Bot.EditMessageTextAsync(Chat.Id, 
                messageId, 
                $"<b>{From.ToHtml()} ({reputation})</b> купил \"{storeItem.Name}\".",
                ParseMode.Html);
        }

        await AnswerQuery(query.Id, answer);
    }

    private async Task PerformPurchase(IRandomMediaService mediaService, int messageId)
    {
        var randomMedia = await mediaService!.GetRandomMediaAsync();
        var file = randomMedia.File;

        switch (randomMedia.Type)
        {
            case InputMediaType.Photo:
                await Bot.SendPhotoAsync(Chat.Id, file, 
                    caption: randomMedia.Caption, 
                    replyToMessageId: messageId, 
                    parseMode: ParseMode.Html, 
                    hasSpoiler: randomMedia.Nsfw
                );
                break;
            case InputMediaType.Video:
                await Bot.SendVideoAsync(Chat.Id, file, 
                    caption: randomMedia.Caption, 
                    replyToMessageId: messageId,
                    parseMode: ParseMode.Html,
                    hasSpoiler: randomMedia.Nsfw
                );
                break;
        }
    }
    
    private bool TryGetMediaService(string name, out IRandomMediaService? mediaService)
    {
        mediaService = _provider.GetServices<IRandomMediaService>()
            .FirstOrDefault(s => s.StoreItem.Id == name);
        
        return mediaService != null;
    }
}