MafiaTelegramBot/MafiaTelegramBot/Game/GameRoles/DoctorRole.cs

using System.Linq;
using System.Threading.Tasks;
using MafiaTelegramBot.Game.GameRooms;
using MafiaTelegramBot.Models;
using MafiaTelegramBot.Resources;
using Telegram.Bot.Types;

namespace MafiaTelegramBot.Game.GameRoles
{
    public class DoctorRole : GameRoom.Role
    {
        public override Roles RoleKey => Roles.Doctor;
        private bool _haveTargets = true;
        public override async Task NightAction()
        {
            var targets = Room.Players.Values.Where(p => p.IsAlive && p.CanBeHealed).ToList();
            Message message = null;
            if (targets.Count == 0)
            {
                message = await Bot.SendWithMarkdown2(Player.ChatId, strings.nothing_to_heal);
                _haveTargets = false;
            }
            else message = await Bot.SendWithMarkdown2(Player.ChatId, strings.choose_player_to_heal, 
                Keyboard.NightChooseTargetKeyboard(targets, Player.Id));
            MessageId = message.MessageId;
        }

        public override async Task ApplyNightActionResult()
        {
            if (NightTargetId == -1 && _haveTargets)
                await Bot.EditMessageAsync(Player.ChatId, MessageId, strings.you_have_not_choosen_target);
            else
            {
                var target = Room.Players[NightTargetId];
                NightTargetId = -1;
                if (!target.IsAlive)
                {
                    target.IsAlive = true;
                    target.CanBeHealed = false;
                    await Bot.SendWithMarkdown2(Player.ChatId, $"{strings.you_save_player} {target.NickName}");
                    await Bot.SendWithMarkdown2(target.ChatId, strings.doctor_save_you);
                }
            }
        }

        public override Task CancelNightActionResult(string message)
        {
            return Task.CompletedTask;
        }

        public override async Task<Message> SetNightTarget(long userId)
        {
            NightTargetId = userId;
            var target = Room.Players[userId];
            await Bot.SendWithMarkdown2(target.ChatId, strings.doctor_heals_you);
            return await Bot.EditMessageAsync(Player.ChatId, MessageId, $"{strings.you_choose_target} {Room.Players[userId].NickName}");
        }

        public DoctorRole(GameRoom room, Player player) : base(room, player) { }
    }
}