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

namespace Bandersnatch
{
    public class Player
    {
        private Stack<int> history;
        private int index;

        private Graph story;


        public Player(Graph story)
        {
            Stack<int> history = new Stack<int>();
            this.story = story;
            this.index = story.GetBegin();
        }

        public void Game()
        {
            int status;
            history.Push(index);
            do
            {
                status = GetNextAction();
            } while (story.GetNode(status).GetType() != NodeType.End);
            Console.WriteLine(story.GetNode(status).GetMessage());
        }

        private int GetInput(ConsoleKeyInfo input, int limit, ref int line)
        {
            if (input.Key == ConsoleKey.UpArrow && line > 1)
                return --line;
            if (input.Key == ConsoleKey.DownArrow && line < limit)
                return ++line;
            if (input.Key == ConsoleKey.Q)
                return -2;
            if (input.Key == ConsoleKey.Enter)
            {
                history.Push(line - 1);
                return line - 1;
            }
            return line;
        }

        private int GetNextAction()
        {
            int i = history.Peek();
            Node actualNode = story.GetNode(i);
            Dictionary<int, string> neighbours = actualNode.GetNeighbours();
            int limit = neighbours.Count;
            int line = 1;

            if (limit == 0)
                return -1;

            ConsoleKeyInfo input;
            do
            {
                Console.WriteLine($"{actualNode.GetMessage()}\n");

                Console.SetCursorPosition(0, line);
                Console.Write('>');

                Console.SetCursorPosition(4, 1);
                foreach (KeyValuePair<int, string> item in neighbours)
                {
                    Console.Write(item.Value);
                    Console.SetCursorPosition(4, Console.CursorTop + 1);
                }

                input = Console.ReadKey();
                line = GetInput(input, limit, ref line);
                Console.Clear();

            } while (input.Key != ConsoleKey.Q || input.Key != ConsoleKey.Enter);
            return line;
        }

        private void DisplaySave()
        {
            throw new NotImplementedException();
        }

        public bool LoadSave(string save)
        {
            throw new NotImplementedException();
        }
    }
}