using System;
using System.Collections.Generic;

namespace CodeDojo.Linjeteller
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var startTime = DateTime.Now;
            var startState = ConstructParser();
            var initTime = DateTime.Now;
            foreach (var s in args)
            {
                var runTime = DateTime.Now;
                var linesOfCode = GetLinesOfCode(s, startState);
                var stepTime = DateTime.Now;
                
                Console.WriteLine("Antall linjer: {0}", linesOfCode);
                Console.WriteLine("Run: {0}", (stepTime - runTime).Milliseconds);
                Console.WriteLine("------------------------");
            }
            var stopTime = DateTime.Now;

            Console.WriteLine("InitTime: {0}", (stopTime - startTime).Milliseconds);
            Console.Read();
        }

        private static State ConstructParser()
        {
            var startState = new State();
            var firstSlashState = new State();
            var secondSlashState = new State();

            var firstSlashTextState = new State();
            var secondTextSlashState = new State();

            var firstAsteriskState = new State();
            var secondAsteriskState = new State();

            var firstTextAsteriskState = new State();
            var secondTextAsteriskState = new State();
            var textState = new State() { IsCode = true };
            var quoteState = new State();

            #region startstate
            startState.DefaultState = textState;
            startState.ValidStates.Add('/', firstSlashState);
            startState.ValidStates.Add('\t', startState);
            startState.ValidStates.Add('\n', startState);
            startState.ValidStates.Add(' ', startState);
            #endregion

            #region quoteState
            quoteState.DefaultState = quoteState;
            quoteState.ValidStates.Add('\n', startState);
            quoteState.ValidStates.Add('"', textState);
            #endregion

            #region textState
            textState.DefaultState = textState;
            textState.ValidStates.Add('/', firstSlashTextState);
            textState.ValidStates.Add('"', quoteState);
            textState.ValidStates.Add('\n', startState);
            #endregion

            #region firstSlashTextState
            firstSlashTextState.DefaultState = textState;
            firstSlashTextState.ValidStates.Add('/', secondTextSlashState);
            firstSlashTextState.ValidStates.Add('*', firstTextAsteriskState);
            #endregion

            #region secondSlashState
            secondTextSlashState.DefaultState = secondTextSlashState;
            secondTextSlashState.ValidStates.Add('\n', startState);
            #endregion

            #region firstSlashState
            firstSlashState.ValidStates.Add('/', secondSlashState);
            firstSlashState.ValidStates.Add('*', firstAsteriskState);
            firstSlashState.DefaultState = textState;
            #endregion

            #region secondSlashState
            secondSlashState.DefaultState = secondSlashState;
            secondSlashState.ValidStates.Add('\n', startState);
            #endregion

            #region firstTextAsteriskState
            firstTextAsteriskState.DefaultState = firstTextAsteriskState;
            firstTextAsteriskState.ValidStates.Add('*', secondTextAsteriskState);
            #endregion

            #region secondTextAsteriskState
            secondTextAsteriskState.DefaultState = firstTextAsteriskState;
            secondTextAsteriskState.ValidStates.Add('/', startState);
            #endregion

            #region firstAsteriskState
            firstAsteriskState.ValidStates.Add('*', secondAsteriskState);
            firstAsteriskState.DefaultState = firstAsteriskState;
            #endregion

            #region secondAsteriskState
            secondAsteriskState.DefaultState = firstAsteriskState;
            secondAsteriskState.ValidStates.Add('/', startState);
            #endregion

            return startState;
        }

        public static int GetLinesOfCode(string pathToFile, State currentState)
        {
            if (string.IsNullOrEmpty(pathToFile))
                throw new ArgumentException();

            var file = System.IO.File.ReadAllLines(pathToFile);
            var counter = 0;


            foreach (var line in file)
            {
                var lineHasBeenIncremented = false;
                foreach (var c in line.ToCharArray())
                {
                    currentState = NewState(currentState, c);
                    if (currentState.IsCode && !lineHasBeenIncremented)
                    {
                        lineHasBeenIncremented = true;
                        counter++;
                    }
                }
                currentState = NewState(currentState, '\n');
            }
            return counter;
        }

        private static State NewState(State currentState, char c)
        {
            if (currentState.ValidStates.ContainsKey(c))
            {
                currentState = currentState.ValidStates[c];
            }
            else if (currentState.DefaultState != null)
            {
                currentState = currentState.DefaultState;
            }
            return currentState;
        }
    }

    public class State
    {
        public Dictionary<char, State> ValidStates { get; set; }
        public State DefaultState = null;
        public bool IsCode = false;

        public State()
        {
            ValidStates = new Dictionary<char, State>();
        }
    }
}