using System;
using System.IO;
using System.Net.Http;
using System.Reflection;
using System.Text;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using Telegram.Bot;
using Telegram.Bot.Args;
using Telegram.Bot.Types.ReplyMarkups;

namespace ZaoBot
{
	class Program
	{
		static ITelegramBotClient botClient;
		static JsonDocument config;
		static HttpClient http = new HttpClient();

		const string CMD_LEFT_GATE = "Открой левые ворота";
		const string CMD_RIGHT_GATE = "Открой правые ворота";

		static void Main(string[] args)
		{
			config = LoadConfig();
			var token = config.RootElement.GetProperty("token").GetString();
			botClient = new TelegramBotClient(token);
			var me = botClient.GetMeAsync().Result;
			Console.WriteLine($"Hello, World! I am user {me.Id} and my name is {me.FirstName}.");
			botClient.OnMessage += OnBotMessage;
			botClient.StartReceiving();
			while (true) Thread.Sleep(10000);
		}

		private static async void OnBotMessage(object sender, MessageEventArgs e)
		{
			if (e.Message.Text != null)
			{
				if (!VerifyUser(e.Message.Chat.Id, e.Message.Chat.Username))
				{
					Console.WriteLine($"Received message {e.Message.Text} from invalid user {e.Message.Chat.Username}");
					await botClient.SendTextMessageAsync(
						chatId: e.Message.Chat,
						text: "Ваш ID " + e.Message.Chat.Id + " сообщите его администратору"
					);
					return;
				}
				Console.WriteLine($"Received a text message in chat {e.Message.Chat.Id}.");

				if (e.Message.Text == CMD_LEFT_GATE)
				{
					await OpenLeftGate();
				}
				if (e.Message.Text == CMD_RIGHT_GATE)
				{
					await OpenRightGate();
				}

				var replyKeyboardMarkup = new ReplyKeyboardMarkup(
					new KeyboardButton[][]
					{
						new KeyboardButton[] { CMD_LEFT_GATE, CMD_RIGHT_GATE },
					},
					resizeKeyboard: true
				);

				await botClient.SendTextMessageAsync(
				  chatId: e.Message.Chat,
				  text: "Чего изволите?",
				  replyMarkup: replyKeyboardMarkup
				);
			}
		}

		private static async Task OpenRightGate()
		{
			var url = config.RootElement.GetProperty("openhab_url").GetString();
			url += config.RootElement.GetProperty("item_right_gate").GetString();
			await Post(url, "ON");
		}

		private static async Task Post(string url, string v)
		{
			var content = new ByteArrayContent(Encoding.UTF8.GetBytes(v));
			content.Headers.Add("Content-Type", "text/plain");
			await http.PostAsync(url, content);
		}

		private static async Task OpenLeftGate()
		{
			var url = config.RootElement.GetProperty("openhab_url").GetString();
			url += config.RootElement.GetProperty("item_left_gate").GetString();
			await Post(url, "ON");
		}

		private static bool VerifyUser(long id, string username)
		{
			Console.WriteLine("Verify user " + username + " id " + id);
			foreach (var element in config.RootElement.GetProperty("valid_users").EnumerateArray())
			{
				if (username == element.GetString())
				{
					return true;
				}
			}
			foreach (var element in config.RootElement.GetProperty("valid_user_ids").EnumerateArray())
			{
				if (id.ToString() == element.GetString())
				{
					return true;
				}
			}
			return false;
		}

		private static JsonDocument LoadConfig()
		{
			string assemblyFolder = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
			var config = Path.Combine(assemblyFolder, "zaobot.json");
			string configStr = File.ReadAllText(config);
			return JsonDocument.Parse(configStr);
		}


	}
}