BeatLyrics/BeatLyrics.Tool/DataProvider/OnlineLyric/LyricProviderBase.cs

using BeatLyrics.Tool.DataProvider.OnlineLyric.Models;
using BeatLyrics.Tool.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace BeatLyrics.Tool.DataProvider.OnlineLyric
{
    public abstract class LyricProviderBase
    {
        private static readonly Regex RegexLrc = new Regex(@"\[(\d{2})\:(\d{2})[\.\:](\d{2,3})\](.+)", RegexOptions.Compiled);

        public abstract LyricSearchResultItem[] Search(string songName, string artist);

        public abstract void GetDetail(LyricSearchResultItem input);

        protected static List<LyricDetailExt> ParseLrc(string input, int duration)
        {
            var matches = RegexLrc.Matches(input);

            var ret = matches.Cast<Match>().Select(p =>
            {
                var timeStamp = $"{p.Groups[1]}:{p.Groups[2]},{p.Groups[3].Value.PadLeft(3, '0')}";

                var text = p.Groups[4].Value;

                return new LyricDetailExt
                {
                    TimeMs = (int)TimeSpan.ParseExact(timeStamp, @"mm\:ss\,fff", null).TotalMilliseconds,
                    Text = text,
                };
            }).ToList();

            for (var i = 0; i < ret.Count; i++)
            {
                var item = ret[i];
                var nextItem = ret.Count > i + 1 ? ret[i + 1] : null;

                if (nextItem != null) item.DurationMs = nextItem.TimeMs - item.TimeMs;
                else item.DurationMs = duration - item.TimeMs;

                if (item.DurationMs < 0) item.DurationMs = 1000;
            }

            return ret;
        }
    }
}