#!/usr/bin/env python
"""
This is a program that generates playlists based on the size of the
largest file/directory. It searches directories, getting their size
and lists the first file in the largest direcotry.
"""

import errno
import os
import sys

class File:
    """A file has a size and a name"""

    def __init__(self, path):
        self.name = path
        self.size = os.path.getsize(self.name)

    def get_size(self):
        """Get the size of the current file"""
        return self.size

    def get_name(self):
        """Get the name of the current file"""
        return self.name

class Directory:
    """A directory is a list that can contain files and other directories."""

    def __init__(self, path):
        self.path = path
        self.files = []

        files = os.listdir(path)
        files.sort()
        for fil in files:
            if type(fil).__name__ == "str":
                self.files.append(File("%s/%s" % (path, fil)))

    def get_dir_name(self):
        """Get the name of the current directory."""
        return self.path

    def get_dir_size(self):
        """Get the size of the current directory."""
        ret = 0
        for fil in self.files:
            ret += fil.get_size()
        return ret

    def get_head_file(self):
        """Get the 'head' file in the directory."""
        return self.files[0].get_name()

    def num_files(self):
        """Get the number of files in the directory."""
        return len(self.files)

    def remove_head_file(self):
        """Remove the head file from being counted."""
        self.files = self.files[1:]

def sort_dir(direct):
    """Sort the directories by size."""
    return direct.get_dir_size()

def main():
    """The main script."""
    try:
        base_dir = sys.argv[1]
    except IndexError:
        print "Must enter path of directory to search. Example: %s ./foo" % \
                sys.argv[0]
        os.abort()

    if os.path.exists(base_dir) == False:
        print "Could not find path: '%s'" % base_dir
        os.abort()

    if base_dir[-1] == "/":
        base_dir = base_dir[:-1]

    base_dir_listing = os.listdir(base_dir)
    directories = []

    for direct in base_dir_listing:
        rel_dir = "%s/%s" % (base_dir, direct)

        if os.path.islink(rel_dir) == False and os.path.isdir(rel_dir):
            directories.append(Directory(rel_dir))

    while directories:
        directories.sort(key=sort_dir)
        directories.reverse()
        headfile = directories[0].get_head_file()
        #headfile = headfile.replace('podcasts/', 'podcast/', 1)
        #print headfile
        try:
            sys.stdout.write("%s\n" % headfile)
        except IOError as e:
            if e.errno == errno.EPIPE:
                return
            raise e
        directories[0].remove_head_file()
        if directories[0].num_files() == 0:
            directories = directories[1:]

if __name__ == "__main__":
    main()
