using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;
using Telegram.Bot;
using Telegram.Bot.Args;
using Telegram.Bot.Types.InputFiles;
using Telegram.Bot.Types.ReplyMarkups;
using ZaoBot.OpenHab;

namespace ZaoBot
{
	class CameraConfigData
	{
		public string name;
		public string url;
	}

	class CamerasMenuUserState : IUserState
	{
		public const string CMD_BACK = "Назад";

		ITelegramBotClient botClient;
		private JsonDocument config;
		List<CameraConfigData> cameras;
		OpenHabClient openhab;

		public CamerasMenuUserState(ITelegramBotClient botClient, JsonDocument config, OpenHabClient openhab)
		{
			this.botClient = botClient;
			this.config = config;
			this.openhab = openhab;
			cameras = new List<CameraConfigData>();
			foreach (var element in config.RootElement.GetProperty("cameras").EnumerateObject())
			{
				var cam = new CameraConfigData()
				{
					name = element.Name,
					url = element.Value.GetString(),
				};
				cameras.Add(cam);
			}
		}

		public async Task<IUserState> ProcessMessage(IUserState previous, MessageEventArgs e)
		{
			if (e.Message.Text == CMD_BACK)
			{
				var newState = new MainMenuUserState(botClient, config, openhab);
				await newState.ProcessMessage(this, e);
				return newState;
			}
			var response = "Выберите камеру";

			foreach (var cam in cameras)
			{
				if (e.Message.Text == cam.name)
				{
					try
					{
						SendCameraImage(e.Message.Chat, cam);
					}
					catch (Exception ex)
					{
						await botClient.SendTextMessageAsync(chatId: e.Message.Chat,
						  text: "Error: " + ex.Message);
					}
				}
			}
			var buttons = new KeyboardButton[cameras.Count + 1][];
			for (int i = 0; i < cameras.Count; i++)
			{
				buttons[i] = new KeyboardButton[] { cameras[i].name };
			}
			buttons[cameras.Count] = new KeyboardButton[] { CMD_BACK };

			var replyKeyboardMarkup = new ReplyKeyboardMarkup(
			   buttons,
			   resizeKeyboard: true
		   );

			await botClient.SendTextMessageAsync(
			  chatId: e.Message.Chat,
			  text: response,
			  replyMarkup: replyKeyboardMarkup
			);
			return this;
		}

		private async void SendCameraImage(Telegram.Bot.Types.Chat chat, CameraConfigData cam)
		{
			using (WebClient client = new WebClient())
			{
				await client.DownloadFileTaskAsync(
					new System.Uri(cam.url),
					"temp.jpg"
				);
				using (Stream stream = File.OpenRead("temp.jpg"))
				{
					await botClient.SendDocumentAsync(
						chatId: chat,
						document: new InputOnlineFile(content: stream, fileName: cam.name + ".jpg")
					);
				}
			}
		}
	}
}