using System;
using System.Collections.Generic;
using System.Linq;
using hyjiacan.util.p4n;

namespace Wox.Infrastructure
{
    public static class Alphabet
    {
        /// <summary>
        /// replace chinese character with pinyin, non chinese character won't be modified
        /// <param name="word"> should be word or sentence, instead of single character. e.g. 微软 </param>
        /// </summary>
        public static string[] Pinyin(string word)
        {
            var pinyin = word.Select(c =>
                             {
                                 var pinyins = PinyinHelper.toHanyuPinyinStringArray(c);
                                 var result = pinyins == null ? c.ToString() : pinyins[0];
                                 return result;
                             }).ToArray();
            return pinyin;
        }

        /// <summmary>
        /// replace chinese character with pinyin, non chinese character won't be modified
        /// Because we don't have words dictionary, so we can only return all possiblie pinyin combination
        /// e.g. 音乐 will return yinyue and yinle
        /// <param name="word"> should be word or sentence, instead of single character. e.g. 微软 </param>
        /// </summmary>
        public static string[][] PinyinComination(string word)
        {
            var combination = word.Select(c =>
                                   {
                                       var pinyins = PinyinHelper.toHanyuPinyinStringArray(c);
                                       var result = pinyins ?? new[] { c.ToString() };
                                       return result;
                                   }).Aggregate(Combination)
                                   .Select(c => c.Split(';'))
                                   .ToArray();
            return combination;
        }

        public static string Acronym(string[] pinyin)
        {
            var acronym = string.Join("", pinyin.Select(p => p[0]));
            return acronym;
        }

        public static bool ContainsChinese(string word)
        {
            var chinese = word.Select(PinyinHelper.toHanyuPinyinStringArray)
                              .Any(p => p != null);
            return chinese;
        }

        private static string[] Combination(string[] array1, string[] array2)
        {
            var combination = (
                from a1 in array1
                from a2 in array2
                select $"{a1};{a2}"
            ).ToArray();
            return combination;
        }
    }
}