using System;
using System.Collections.Generic;

namespace SBRL.Algorithms.MorseCodeTranslator
{
	/// <summary>
	/// A simple class to translate a morse code string into a normal string.
	/// </summary>
	/// <license>Mozilla Public License version 2.0</license>
	/// <origin></origin>
	/// <author>Starbeamrainbowlabs (https://starbeamrainbowlabs.com/)</author>
	/// <changelog>
	/// v0.1 - 26th May 2017:
	///      - Creation! 😁
	/// </changelog>
	public static class MorseDecoder
    {
        /// <summary>
        /// The morse code lookup table. Use the methods in this class is possible,
        /// rather than accessing this lookup table directly!
        /// </summary>
        public static Dictionary<string, char> morseCodeLookup = new Dictionary<string, char>()
        {
            [".-"] = 'a',
			["-..."] = 'b',
			["-.-."] = 'c',
			["-.."] = 'd',
			["."] = 'e',
			["..-."] = 'f',
			["--."] = 'g',
			["...."] = 'h',
			[".."] = 'i',
			[".---"] = 'j',
			["-.-"] = 'k',
			[".-.."] = 'l',
			["--"] = 'm',
			["-."] = 'n',
			["---"] = 'o',
			[".--."] = 'p',
			["--.-"] = 'q',
			[".-."] = 'r',
			["..."] = 's',
			["-"] = 't',
			["..-"] = 'u',
			["...-"] = 'v',
			[".--"] = 'w',
			["-..-"] = 'x',
			["-.--"] = 'y',
			["--.."] = 'z',
			[".----"] = '1',
			["..---"] = '2',
			["...--"] = '3',
			["....-"] = '4',
			["....."] = '5',
			["-...."] = '6',
			["--..."] = '7',
			["---.."] = '8',
			["----."] = '9',
			["-----"] = '0',
        };

        /// <summary>
        /// Translates a single letter from morse code.
        /// </summary>
        /// <param name="morseSource">The morse code to translate.</param>
		/// <returns>The translated letter.</returns>
        public static char TranslateLetter(string morseSource)
        {
            return morseCodeLookup[morseSource.Trim()];
        }

        /// <summary>
        /// Translates a string of space-separated morse code strings from morse code.
        /// </summary>
        /// <param name="morseSource">The morse code to translate.</param>
		/// <returns>The translated word.</returns>
        public static string TranslateWord(string morseSource)
        {
            string result = string.Empty;

            string[] morseLetters = morseSource.Split(" ".ToCharArray());

            foreach(string morseLetter in morseLetters)
                result += TranslateLetter(morseLetter);

            return result;
        }

        /// <summary>
        /// Translates a list of morse-encoded words.
        /// </summary>
        /// <param name="morseSources">The morse-encoded words to decipher.</param>
		/// <returns>The decoded text.</returns>
        public static string TranslateText(IEnumerable<string> morseSources)
        {
            string result = string.Empty;
            foreach(string morseSource in morseSources)
                result += $"{TranslateWord(morseSource)} ";
            return result.Trim();
        }
    }
}