pip install PyQt5

import sys
import os
import re
from PyQt5.QtWidgets import QApplication, QMainWindow, QVBoxLayout, QPushButton, QSlider, QLabel, QFileDialog, QWidget
from PyQt5.QtMultimedia import QMediaPlayer, QMediaContent
from PyQt5.QtCore import Qt, QUrl
from PyQt5.QtGui import QFont

class MusicPlayer(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle("簡單音樂播放器")
        self.setGeometry(100, 100, 600, 500)

        self.player = QMediaPlayer()
        self.lyrics = []  # 存儲歌詞 [(timestamp, lyric), ...]

        self.setup_ui()

        # 連接信號
        self.player.durationChanged.connect(self.update_duration)
        self.player.positionChanged.connect(self.update_position)
        self.player.positionChanged.connect(lambda pos: self.update_lyrics())  # 歌詞隨進度更新

        self.show()

    def setup_ui(self):
        central_widget = QWidget(self)
        self.setCentralWidget(central_widget)
        layout = QVBoxLayout()

        # 播放/暫停按鈕
        self.play_pause_button = QPushButton("播放")
        self.play_pause_button.clicked.connect(self.play_pause_music)
        layout.addWidget(self.play_pause_button)

        # 停止按鈕
        stop_button = QPushButton("停止")
        stop_button.clicked.connect(self.stop_music)
        layout.addWidget(stop_button)

        # 音量調節(jié)
        self.volume_slider = QSlider(Qt.Horizontal)
        self.volume_slider.setRange(0, 100)
        self.volume_slider.setValue(50)
        self.volume_slider.valueChanged.connect(self.set_volume)
        layout.addWidget(QLabel("音量"))
        layout.addWidget(self.volume_slider)

        # 進度條
        self.progress_slider = QSlider(Qt.Horizontal)
        self.progress_slider.setEnabled(False)
        self.progress_slider.sliderMoved.connect(self.set_position)
        layout.addWidget(QLabel("進度"))
        layout.addWidget(self.progress_slider)

        # 歌詞顯示
        self.lyrics_label = QLabel("暫無歌詞")
        self.lyrics_label.setAlignment(Qt.AlignCenter)
        self.lyrics_label.setWordWrap(True)
        self.lyrics_label.setFont(QFont("Microsoft YaHei", 16))  # 美化字體
        self.lyrics_label.setStyleSheet("color: #333333;")
        layout.addWidget(self.lyrics_label)

        # 選擇文件按鈕
        select_file_button = QPushButton("選擇文件")
        select_file_button.clicked.connect(self.select_music_file)
        layout.addWidget(select_file_button)

        central_widget.setLayout(layout)

    def play_pause_music(self):
        if self.player.state() == QMediaPlayer.PlayingState:
            self.player.pause()
            self.play_pause_button.setText("播放")
        else:
            self.player.play()
            self.play_pause_button.setText("暫停")
            self.progress_slider.setEnabled(True)

    def stop_music(self):
        self.player.stop()
        self.play_pause_button.setText("播放")
        self.progress_slider.setEnabled(False)
        self.lyrics_label.setText("暫無歌詞")

    def set_volume(self, value):
        self.player.setVolume(value)

    def set_position(self, position):
        self.player.setPosition(position)

    def update_duration(self, duration):
        self.progress_slider.setMaximum(duration)

    def update_position(self, position):
        # 當用戶正在拖動進度條時不更新，防止跳動
        if not self.progress_slider.isSliderDown():
            self.progress_slider.setValue(position)

    def select_music_file(self):
        file_dialog = QFileDialog()
        file_dialog.setNameFilter("音頻文件 (*.mp3 *.wav *.ogg)")
        if file_dialog.exec_() == QFileDialog.Accepted:
            selected_file = file_dialog.selectedFiles()[0]
            self.player.setMedia(QMediaContent(QUrl.fromLocalFile(selected_file)))
            self.player.setVolume(self.volume_slider.value())

            # 重置歌詞
            self.lyrics = []
            self.lyrics_label.setText("加載中...")

            # 加載同名 lrc 文件
            lyrics_file = os.path.splitext(selected_file)[0] + ".lrc"
            if os.path.exists(lyrics_file):
                self.load_lyrics(lyrics_file)

            # 初始更新歌詞顯示（位置為0）
            self.update_lyrics()

    def load_lyrics(self, lyrics_file):
        self.lyrics = []
        try:
            with open(lyrics_file, "r", encoding="utf-8") as f:
                time_pattern = re.compile(r'\[(\d{1,2}:\d{2}\.?\d*)\]')
                for line in f:
                    line = line.strip()
                    if not line:
                        continue
                    times = time_pattern.findall(line)
                    lyric = time_pattern.sub('', line).strip()
                    if times and lyric:
                        for t in times:
                            try:
                                mm, ss = t.split(':')
                                timestamp = int(mm) * 60 + float(ss)
                                self.lyrics.append((timestamp, lyric))
                            except ValueError:
                                continue
        except Exception as e:
            print(f"歌詞加載失敗: {e}")

        self.lyrics.sort(key=lambda x: x[0])
        print(f"成功加載 {len(self.lyrics)} 行歌詞")

    def update_lyrics(self):
        if not self.lyrics:
            self.lyrics_label.setText("無歌詞可用")
            return

        current_pos = self.player.position() / 1000.0

        # 找到當前行（時間戳 <= 當前位置 的最大索引）
        current_index = -1
        for i, (ts, _) in enumerate(self.lyrics):
            if ts <= current_pos:
                current_index = i
            else:
                break

        # 顯示前后各4行（可調整）
        before = 4
        after = 4
        start = max(0, current_index - before) if current_index >= 0 else 0
        end = min(len(self.lyrics), current_index + after + 1) if current_index >= 0 else before + after + 1

        lines = []
        for i in range(start, min(end, len(self.lyrics))):
            lyric = self.lyrics[i][1]
            if current_index >= 0 and i == current_index:
                # 當前行：紅色、加大、加粗
                lines.append(f'<font color="red" size="+3"><b>{lyric}</b></font>')
            elif i <= current_index:
                # 已唱：深灰
                lines.append(f'<font color="#555555">{lyric}</font>')
            else:
                # 未唱：淺灰
                lines.append(f'<font color="#aaaaaa">{lyric}</font>')

        if current_index == -1:
            lines.insert(0, '<font color="#888888">歌曲即將開始...</font>')

        self.lyrics_label.setText("<br>".join(lines))


if __name__ == "__main__":
    app = QApplication(sys.argv)
    player = MusicPlayer()
    sys.exit(app.exec_())