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#!/usr/bin/env python3

# sortashuffle.py
# Shuffles shows but keeps episodes in order.

# USAGE
# 1. Modify the TARGET variable below
# 2. Modify the SOURCES variable below
# 3. Run the script as administrator

import os
import random

# Playlist destination folder
TARGET  = "<ENTER TARGET DIR>"

# Shows to include
# MUST be in format "C://Dir1//Dir2"
SOURCES = ["<SOURCE DIR>",
           "<SOURCE DIR>"]

def get_episode_list():
    """Get list of episodes for each show in SOURCES."""
    SHOWLIST = [[f for f in os.listdir(source)] for source in SOURCES]

def get_weight_list():
    """Determine weights (# of episodes) so shows get spread evenly."""
    WEIGHTLIST = [len(show) for show in showlist]

def shuffle():
    """Shuffle shows, randomly selected according to weight."""
    SHUFFLED = []
    while any(SHOWLIST):
        selection = random.choices(range(len(SHOWLIST)), weights=WEIGHTLIST, k=1)[0]
        SHUFFLED.append(SOURCES[selection] + "//" + SHOWLIST[selection].pop(0))
        WEIGHTLIST[selection] = len(SHOWLIST[selection])

def deploy_symlinks():
    """Deploy a symlink for each episode in the playlist."""
    count = 0
    for episode in SHUFFLED:
        os.symlink(episode, TARGET + str(count))
        count += 1

def deploy_index():
    """Deploy playlist index file."""
    INDEX = open(TARGET + "//" + "_PLAYLIST_INDEX.txt", 'w')
    INDEX.write("\n".join(SHUFFLED))
    INDEX.close()

def main():
    get_episode_list()
    get_weight_list()
    shuffle()
    deploy_symlinks()
    deploy_index()

if __name__=="__main__":
    main()