package code.name.monkey.retromusic.lyrics;

import android.content.Context;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Desc : 歌词解析 Author : Lauzy Date : 2017/10/13 Blog : http://www.jianshu.com/u/e76853f863a9 Email :
 * freedompaladin@gmail.com
 */
public class LrcHelper {

  private static final String CHARSET = "utf-8";
  // [03:56.00][03:18.00][02:06.00][01:07.00]原谅我这一生不羁放纵爱自由
  private static final String LINE_REGEX = "((\\[\\d{2}:\\d{2}\\.\\d{2}])+)(.*)";
  private static final String TIME_REGEX = "\\[(\\d{2}):(\\d{2})\\.(\\d{2})]";

  public static List<Lrc> parseLrcFromAssets(Context context, String fileName) {
    try {
      return parseInputStream(context.getResources().getAssets().open(fileName));
    } catch (IOException e) {
      e.printStackTrace();
    }
    return null;
  }

  public static List<Lrc> parseLrcFromFile(File file) {
    try {
      return parseInputStream(new FileInputStream(file));
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }
    return null;
  }

  private static List<Lrc> parseInputStream(InputStream inputStream) {
    List<Lrc> lrcs = new ArrayList<>();
    InputStreamReader isr = null;
    BufferedReader br = null;
    try {
      isr = new InputStreamReader(inputStream, CHARSET);
      br = new BufferedReader(isr);
      String line;
      while ((line = br.readLine()) != null) {
        List<Lrc> lrcList = parseLrc(line);
        if (lrcList != null && lrcList.size() != 0) {
          lrcs.addAll(lrcList);
        }
      }
      sortLrcs(lrcs);
      return lrcs;
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        if (isr != null) {
          isr.close();
        }
        if (br != null) {
          br.close();
        }
      } catch (IOException e1) {
        e1.printStackTrace();
      }
    }
    return lrcs;
  }

  private static void sortLrcs(List<Lrc> lrcs) {
    Collections.sort(
        lrcs,
        new Comparator<Lrc>() {
          @Override
          public int compare(Lrc o1, Lrc o2) {
            return (int) (o1.getTime() - o2.getTime());
          }
        });
  }

  private static List<Lrc> parseLrc(String lrcLine) {
    if (lrcLine.trim().isEmpty()) {
      return null;
    }
    List<Lrc> lrcs = new ArrayList<>();
    Matcher matcher = Pattern.compile(LINE_REGEX).matcher(lrcLine);
    if (!matcher.matches()) {
      return null;
    }

    String time = matcher.group(1);
    String content = matcher.group(3);
    Matcher timeMatcher = Pattern.compile(TIME_REGEX).matcher(time);

    while (timeMatcher.find()) {
      String min = timeMatcher.group(1);
      String sec = timeMatcher.group(2);
      String mil = timeMatcher.group(3);
      Lrc lrc = new Lrc();
      if (content != null && content.length() != 0) {
        lrc.setTime(
            Long.parseLong(min) * 60 * 1000
                + Long.parseLong(sec) * 1000
                + Long.parseLong(mil) * 10);
        lrc.setText(content);
        lrcs.add(lrc);
      }
    }
    return lrcs;
  }

  public static String formatTime(long time) {
    int min = (int) (time / 60000);
    int sec = (int) (time / 1000 % 60);
    return adjustFormat(min) + ":" + adjustFormat(sec);
  }

  private static String adjustFormat(int time) {
    if (time < 10) {
      return "0" + time;
    }
    return time + "";
  }
}