using System.Collections.Generic;
using System.Linq;

namespace TINK.ViewModel.MiniSurvey.Question
{
	public class CheckOneViewModel : IMiniSurveyQuestion
	{
		/// <summary> Constructs object. </summary>
		/// <param name="question">Holds the question with key asked to user.</param>
		/// <param name="answers">Holds the list of possible answers with their option keys.</param>
		public CheckOneViewModel(
			KeyValuePair<string, string> question,
			Dictionary<string, string> answers)
		{
			Question = question;
			Answers = answers ?? new Dictionary<string, string>();
		}

		/// <summary> Holds the question with key asked to user. </summary>
		public KeyValuePair<string, string> Question { get; }

		/// <summary> Holds the question with key asked to user exposed to GUI. </summary>
		public string QuestionText => Question.Value;

		/// <summary> Holds the list of possible answers with their option keys. </summary>
		public Dictionary<string, string> Answers { get; }

		/// <summary> Holds the list of possible answers exposed to GUI. </summary>
		public IEnumerable<string> AnswersText
		{
			get => Answers.Select(x => x.Value).ToList();
			set => AnswersText = Answers.Select(x => x.Value).ToList();
		}

		/// <summary> Holds the users selected answer (one of answers) with its option key. </summary>
		public KeyValuePair<string, string> Answer { get; private set; }

		/// <summary> Holds the users selected answer (one of answers) in GUI. </summary>
		public string AnswerText
		{
			get => Answer.Value;
			set => Answer = Answers.FirstOrDefault(x => x.Value == value);
		}
	}
}