using BusinessLayer.Interfaces;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BusinessLayer.Repository
{
    public class WordTranformation : IWordTransformation
    {
        HelpMehtods help = new HelpMehtods();
        public string MetaphoneTransformations(string word, int position)
        {
            string result = string.Empty;
            char character = word.ToArray()[position];
            switch (character)
            {
                case 'B':
                    if (position == word.Length-1)
                    {
                        if (word.Last() - 1 == 'M')
                        {
                            result = "";
                        }
                        else
                        {
                            result = "B";
                        }
                    }
                    else
                    {
                        result = "B";
                    }
                    break;
                case 'C':
                    if (position != 0)
                    {
                        if (position + 1 < word.Length)
                        {
                            var temp = word.Substring(position - 1, 1) + word.ToArray()[position] + word.Substring(position + 1, 1);
                            if (temp == "SCH")
                            {
                                result = "K";
                            }
                        }
                    }
                    if (position + 1 < word.Length)
                    {
                        var temp = word.Substring(position, 2);
                        if (temp == "CH")
                        {
                            result = "X";
                            break;
                        }
                    }
                    if (position + 2 < word.Length)
                    {
                        var temp = word.Substring(position, 3);
                        if (temp == "CIA")
                        {
                            result = "X";
                            break;
                        }
                    }
                    if (position + 1 < word.Length)
                    {
                        var temp = word.Substring(position, 2);
                        if (temp == "CI" || temp == "CE" || temp == "CY")
                        {
                            result = "S";
                            break;
                        }
                    }
                    result = "K";
                    break;
                case 'D':
                    if (position + 2 < word.Length)
                    {
                        var temp = word.Substring(position, 3);
                        if (temp == "DGE" || temp == "DGY" || temp == "DGI")
                        {
                            result = "J";
                            break;
                        }
                        else
                        {
                            result = "T";
                            break;
                        }
                    }
                    else
                    {
                        result = "T";
                    }
                    break;
                case 'F':
                    result = "F";
                    break;
                case 'G':
                    if (position + 1 < word.Length)
                    {
                        if (word.Substring(position+1, 1) == "H")
                        {
                            if (position != 0)
                            {
                                if (position != word.Length && !help.IsVowel(word.ToCharArray()[position-1]))
                                {
                                    result = "";
                                    break;
                                }
                            }
                            else
                            {
                                if (position != word.Length)
                                {
                                    result = "";
                                    break;
                                }
                            }

                        }
                    }
                    if (position + 1 < word.Length)
                    {
                        if (word.Substring(position + 1, 1) == "N")
                        {
                            result = "";
                            break;
                        }
                    }
                    if (position + 3 <= word.Length)
                    {
                        if (word.Substring(position + 1, 1) == "NED")
                        {
                            result = "";
                            break;
                        }
                    }
                    if (position != 0)
                    {
                        var temp = word.Substring(position-1,1);
                        if (temp == "I" || temp == "E" || temp == "Y")
                        {
                            if (position + 1 < word.Length)
                            {
                                if (word.Substring(position+1, 1) != "G")
                                {
                                    result = "J";
                                }
                                else
                                {
                                    result = "K";
                                }
                            }
                            else
                            {
                                result = "J";
                            }
                        }
                    }
                    else
                    {
                        result = "K";
                    }
                    break;
                case 'H':
                    if (position != 0)
                    {
                        if (position + 1 < word.Length)
                        {
                            if (help.IsVowel(word.ToCharArray()[position-1]) && !help.IsVowel(word.ToCharArray()[position + 1]))
                            {
                                result = "";
                            }
                        }
                        else
                        {
                            result = "H";
                        }
                    }
                    else if (position == word.Length-1)
                    {
                        if (2 <= word.Length)
                        {
                            if (help.IsVowel(word.ToCharArray()[position - 1]))
                            {
                                result = "";
                            }
                            else
                            {
                                result = "H";
                            }
                        }
                        else
                        {
                            result = "H";
                        }
                    }
                    else
                    {
                        result = "H";
                    }
                    break;
                case 'J':
                    result = "J";
                    break;
                case 'K':
                    if (position != 0)
                    {
                        if (word.Substring(position-1, 1) == "C")
                        {
                            result = "";
                        }
                        else
                        {
                            result = "K";
                            break;
                        }
                    }
                    else
                    {
                        result = "K";
                    }
                    break;
                case 'L':
                    result = "L";
                    break;
                case 'M':
                    result = "M";
                    break;
                case 'N':
                    result = "N";
                    break;
                case 'P':
                    if (position + 1 < word.Length)
                    {
                        var temp = word.Substring(position, 2);
                        if (temp == "PH")
                        {
                            result = "F";
                        }
                        else
                        {
                            result = "P";
                        }
                    }
                    else
                    {
                        result = "P";
                    }
                    break;
                case 'Q':
                    result = "K";
                    break;
                case 'R':
                    result = "R";
                    break;
                case 'S':
                    if (position != 0)
                    {
                        if (word.Substring(position-1,1) == "H")
                        {
                            result = "X";
                        }
                    }
                    if (position + 2 < word.Length)
                    {
                        var temp = word.Substring(position,3);
                        if (temp == "SIO" || temp == "SIA")
                        {
                            result = "X";
                        }
                        else
                        {
                            result = "S";
                        }
                    }
                    else
                    {
                        result = "S";
                    }
                    break;
                case 'T':
                    if (position != 0)
                    {
                        if (word.Substring(position - 1, 1) == "H")
                        {
                            result = "O";
                            break;
                        }
                    }
                    if (position + 2 < word.Length)
                    {
                        var temp = word.Substring(position, 3);
                        if (temp == "TIA" || temp == "TIO")
                        {
                            result = "X";
                        }
                        else if (temp == "TCH")
                        {
                            result = "";
                        }
                        else
                        {
                            result = "T";
                        }
                    }

                    else
                    {
                        result = "T";
                    }
                    break;
                case 'V':
                    result = "F";
                    break;
                case 'W':
                    if (position + 1 < word.Length)
                    {
                        if (help.IsVowel(word.ToCharArray()[position+1]))
                        {
                            result = "W";
                            break;
                        }
                        else
                        {
                            result = "";
                        }
                    }
                    else
                    {
                        result = "";
                    }
                    break;
                case 'X':
                    result = "KS";
                    break;
                case 'Y':
                    if (position + 1 < word.Length)
                    {
                        if (help.IsVowel(word.ToCharArray()[position + 1]))
                        {
                            result = "Y";
                            break;
                        }
                        else
                        {
                            result = "";
                        }
                    }
                    break;
                case 'Z':
                    result = "S";
                    break;
                default:
                    break;
            }
            return result;
        }
    }
}