import os
import tkinter
import tkinter.filedialog
import time
import threading
import pygame

#第一步 搭建界面
root = tkinter.Tk()
root.title('音乐播放器')
#窗口大小和位置
root.geometry('460x600+500+100')
#不能拉伸
root.resizable(False,False)

folder = ''#文件路径
res = []
num = 0
now_music = ''
#第二步 功能实现
def buttonChooseClik():
 '''添加文件函数'''
 global folder
 global res
 if not folder:
  folder = tkinter.filedialog.askdirectory()#选择目录
  musics = [folder + '\\' + music
     for music in os.listdir(folder) if music.endswith(('.mp3','ogg'))]
  ret = []
  for i in musics:
   ret.append(i.split('\\')[1:])
   res.append(i.replace('\\','/'))
  var2 = tkinter.StringVar()
  var2.set(ret)
  #放入列表框
  lb = tkinter.Listbox(root,listvariable =var2)
  lb.place(x=50,y=100,width=260,height=300)
 if not folder:
  return
 global playing
 playing = True

 # 根据情况禁用和启用相应的按钮
 buttonPlay['state'] = 'normal'
 buttonStop['state'] = 'normal'
 pause_resume.set('播放')


def play():
 '''播放音乐的函数'''
 #初始化混音器设备
 if len(res):
  pygame.mixer.init()
  global num
  while playing:
   if not pygame.mixer.music.get_busy():
    #随机播放一首歌曲
    nextMusic =res[num]
    print(nextMusic)
    print(num)
    pygame.mixer.music.load(nextMusic.encode())
    #播放一次
    pygame.mixer.music.play(1)
    #print(len(res)-1)
    if len(res) -1==num:
     num=0
    else:
     num = num+1
    nextMusic = nextMusic.split('\\')[1:]
    musicName.set('playing....'+''.join(nextMusic))
   else:
    time.sleep(0.1)

def bottonPlayClik():
 '''点击播放'''
 buttonNext['state'] = 'normal'
 buttonPrev['state'] = 'normal'

 if pause_resume.get() == '播放':
  pause_resume.set('暂停')
  global folder
  if not folder:
   #选择目录，返回目录名
   folder = tkinter.filedialog.askdirectory()
  if not folder:
   return
  global playing
  playing = True

  #创建线程，主线程接受用户操作

  t = threading.Thread(target=play)
  t.start()
 elif pause_resume.get() == '暂停':
  pygame.mixer.music.pause()
  pause_resume.set('继续')
 elif pause_resume.get() == '继续':
  pygame.mixer.music.unpause()
  pause_resume.set('暂停')


def bottonStopClik():
 '''停止播放'''
 global playing
 playing = False
 pygame.mixer.music.stop()
def bottonNextClik():
 '''播放下一首'''
 global playing
 playing = False
 pygame.mixer.music.stop()
 global num
 if len(res)== num:
  num = 0
 playing = True

 t = threading.Thread(target=play)
 t.start()

def bottonPrevClik():
 '''播放上一首'''
 global playing
 playing = True
 pygame.mixer.music.stop()
 global num
 if num == 0:
  num = len(res)-2
 elif num == len(res) - 1:
  num -= 2
 else:
  num -=2
 print(num)

 playing = True

 t = threading.Thread(target = play)

 t.start()

def closeWindow():
 '''关闭窗口'''
 global playing
 playing = False
 time.sleep(0.3)
 try:
  pygame.mixer.music.stop()
  pygame.mixer.quit()
 except:
  pass
 root.destroy()

def control_voice(value = 0.5):
 pygame.mixer.music.set_volume(float(value))

#关闭窗口
root.protocol('WM_DELETE_WINDOW',closeWindow)
#添加按钮
buttonChoose = tkinter.Button(root,text='添加',command=buttonChooseClik)
#布局
buttonChoose.place(x=50,y=10,width=50,height=20)
#播放按钮 跟踪变量值的变化
pause_resume = tkinter.StringVar(root,value='播放')
buttonPlay= tkinter.Button(root,textvariable=pause_resume,command=bottonPlayClik)
buttonPlay.place(x=190,y=10,width=50,height=20)
buttonPlay['state'] = 'disabled'
#停止播放
buttonStop = tkinter.Button(root,text = '停止',command=bottonStopClik)
#布局
buttonStop.place(x=120,y=10,width=50,height=20)
#状态
buttonStop['state'] = 'disabled'
# 下一首
buttonNext = tkinter.Button(root,text='下一首',command =bottonNextClik)

buttonNext.place(x=260,y=10,width=50,height=20)

buttonNext['state'] = 'disabled'

#上一首
buttonPrev = tkinter.Button(root,text='上一首',command =bottonPrevClik)
buttonPrev.place(x = 330,y=10,width=50,height=20)
buttonPrev['state'] = 'disabled'

musicName = tkinter.StringVar(root,value='暂时没有播放音乐')
labelName = tkinter.Label(root,textvariable=musicName)

labelName.place(x=10,y=30,width=260,height=20)

#添加控件
s = tkinter.Scale(root,label='音量',from_=0,to=1,orient=tkinter.HORIZONTAL,
     length=240,showvalue=0,tickinterval=2,resolution=0.1,command=control_voice)

s.place(x=50,y=50,width=200)

#启动消息循环
root.mainloop()