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

namespace ZaoBot
{
	class MainMenuUserState : IUserState
	{
		const string CMD_WEATHER = "Погода";
		const string CMD_STATUS = "Статус";
		const string CMD_LEFT_GATE = "Открой левые ворота";
		const string CMD_RIGHT_GATE = "Открой правые ворота";

		ITelegramBotClient botClient;
		private JsonDocument config;
		HttpClient http = new HttpClient();
		OpenHabClient openhab;

		public MainMenuUserState(ITelegramBotClient botClient, JsonDocument config, OpenHabClient openhab)
		{
			this.botClient = botClient;
			this.config = config;
			this.openhab = openhab;
		}

		public async Task<IUserState> ProcessMessage(IUserState previous, MessageEventArgs e)
		{
			var response = "";
			if (e != null)
			{
				if (!VerifyUser(e.Message.Chat.Id, e.Message.Chat.Username))
				{
					Console.WriteLine($"Received message {e.Message.Text} from invalid user {e.Message.Chat.Username}");
					await botClient.SendTextMessageAsync(
						chatId: e.Message.Chat,
						text: "Ваш ID " + e.Message.Chat.Id + " сообщите его администратору"
					);
					return this;
				}
				Console.WriteLine($"Received a text message in chat {e.Message.Chat.Id}.");

				if (e.Message.Text == CMD_LEFT_GATE)
				{
					response = await OpenLeftGate();
				}
				else if (e.Message.Text == CMD_RIGHT_GATE)
				{
					response = await OpenRightGate();
				}
				else if (e.Message.Text == CMD_WEATHER)
				{
					response = await ShowWeather();
				}
				else if (e.Message.Text == CMD_STATUS)
				{
					var newState = new StatusMenuUserState(botClient, config, openhab);
					await newState.ProcessMessage(this, e);
					return newState;
				}
				else if (e.Message.Text == "")
				{
					response = "Превед!";
				}
				else if (previous != this) response = "Главное меню";
				else response = "Я не понял :-(";

				if (e.Message.Text != "") response += "\nЧто дальше?";
				else response = "\nЧего изволите?";
			}

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

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

		private async Task<string> ShowWeather()
		{
			try
			{
				string response = "";
				foreach (var element in config.RootElement.GetProperty("items_weather").EnumerateObject())
				{
					var result = await openhab.GetItemState(element.Name);
					response += element.Value + ": " + ParseState(result) + "\n";
				}
				return response;
			}
			catch (Exception e)
			{
				return "Fail: " + e.Message;
			}
		}

		private string ParseState(ItemState state)
		{
			float value;
			if (!float.TryParse(state.state, out value))
			{
				return "null";
			}
			try
			{
				return printf.Printf.sprintf(state.pattern, value);
			}
			catch (KeyNotFoundException)
			{
				return value.ToString();
			}
		}

		private async Task<string> OpenRightGate()
		{
			return await openhab.PostItemState(config.RootElement.GetProperty("item_right_gate").GetString(), "ON");
		}

		private async Task<string> OpenLeftGate()
		{
			return await openhab.PostItemState(config.RootElement.GetProperty("item_left_gate").GetString(), "ON");
		}

		private 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;
		}
	}
}