using BotPages.Core;
using Telegram.Bot;
using Telegram.Bot.Types;
using Telegram.Bot.Types.Enums;
using Telegram.Bot.Types.ReplyMarkups;
using static System.Net.Mime.MediaTypeNames;

namespace BotPages.Telegram
{
    /// <summary>
    /// Адаптер клиента для Telegram Bot API.
    /// </summary>
    public sealed class TelegramClientAdapter : IChatClient
    {
        private readonly ITelegramBotClient _bot;

        /// <summary>
        /// Создаёт адаптер на основе ITelegramBotClient.
        /// </summary>
        public TelegramClientAdapter(ITelegramBotClient bot) => _bot = bot;

        /// <summary>
        /// Отправляет текстовое сообщение с опциональной клавиатурой.
        /// </summary>
        public Task SendTextAsync(long chatId, PageMessage message, IEnumerable<PageAction>? actions, CancellationToken ct)
        {
            ReplyMarkup? replyMarkup = null;

            if (actions is { })
            {
                var inlineGroups = actions
                    .Where(a => a.Placement == ActionPlacement.Inline)
                    .GroupBy(a => a.Row)
                    .OrderBy(g => g.Key)
                    .Select(g => g.Select(a => InlineKeyboardButton.WithCallbackData(a.Label, a.Value)).ToArray())
                    .ToArray();

                var replyGroups = actions
                    .Where(a => a.Placement == ActionPlacement.Reply)
                    .GroupBy(a => a.Row)
                    .OrderBy(g => g.Key)
                    .Select(g => g.Select(a => new KeyboardButton(a.Label)).ToArray())
                    .ToArray();

                if (inlineGroups.Any())
                    replyMarkup = new InlineKeyboardMarkup(inlineGroups);
                else if (replyGroups.Any())
                    replyMarkup = new ReplyKeyboardMarkup(replyGroups) { ResizeKeyboard = true };
            }

            var parseMode = message.Format switch
            {
                MessageFormat.Markdown => ParseMode.MarkdownV2,
                MessageFormat.Html => ParseMode.Html,
                _ => ParseMode.None,
            };


            return _bot.SendMessage(new ChatId(chatId),
                message.Text,
                parseMode: parseMode,
                replyMarkup: replyMarkup,
                disableNotification: message.IsSilent,
                cancellationToken: ct
                );
        }


        /// <summary>
        /// Отправляет файлы как документы (по одному или пачкой).
        /// </summary>
        public async Task SendFilesAsync(long chatId, IEnumerable<FileDescriptor> files, CancellationToken ct)
        {
            foreach (var f in files)
            {
                if (f.Content is not null)
                {
                    var input = new InputFileStream(f.Content, f.Name);
                    await _bot.SendDocument(chatId, input, cancellationToken: ct);
                }
                else
                {
                    // Если контент не загружен, и есть FileId — отправляем по Id
                    await _bot.SendDocument(chatId, new InputFileId(f.Id), cancellationToken: ct);
                }
            }
        }
    }
}