#!/usr/bin/python3
    
from pathlib import Path

EXTENSIONS=(".mp3",".ogg",".wav",".mpa",".m4a",".flac")

class ClockyTracklist:
    """read and monitor directory with audio files"""
    def __init__(self,path=".",recursive=False,sort=True,verbose=False):
        """Read (current or supplied) path for all audio files. Add recursive=True to check all subdirectories too"""
        self.recursive=recursive
        self.path=path
        self.__verbose=verbose
        self.__sort=sort
        self.__reloaded=False
        self.supportedformats=EXTENSIONS

        p=Path(self.path)
        if not p.exists():
            print("ERROR: directory \""+path+"\" does not exist")
            exit();
        if not p.is_dir():
            print("ERROR: \""+path+"\" is not an directory")
            exit();

        self.__ReadTrackList()

        if self.count==0:
            print("ERROR: no (supported) files found in directory \""+path+"\"")
            exit();

        if(self.__verbose):
            self.ShowTrackList()


    def __ReadTrackList(self):
        """do the actual reading"""
        self.tracklist=[]
        self.count=0
        path=Path(self.path)

        if(self.recursive):
            selection='**/*'
        else:
            selection='*'
        for entry in path.glob(selection):
            if entry.suffix in EXTENSIONS:
                self.tracklist.append(entry.as_posix())
                self.count+=1
        if self.__sort:
            self.tracklist.sort()


    def ShowTrackList(self):
        """Print the list"""
        print("Tracklist:")
        print("  path      = %s" %self.path)
        print("  recursive = %s" %self.recursive)
        print("  count     = %d" %self.count)
        print("  tracks:")
        for track in self.tracklist:
            print("    "+track)
            f=open(track,"r")
            if(f):
                f.close()

    def CheckTrackList(self):
        """Check path for filechanges"""
        newtracklist=[]
        newcount=0
        
        if self.__reloaded:
            self.__reloaded=False

        newpath=Path(self.path)
        if(self.recursive):
            selection='**/*'
        else:
            selection='*'
        for newentry in newpath.glob(selection):
            if newentry.suffix in EXTENSIONS:
                newtracklist.append(newentry.as_posix())
                newcount+=1
        if self.__sort:
            newtracklist.sort()
        if(newcount != self.count) or (newtracklist != self.tracklist):
            if(self.__verbose):
                print("Changes in filenames or number of files detected! Re-read tracklist.")
            self.__ReadTrackList()
            self.__reloaded=True

        return self.__reloaded