#!/usr/bin/python
import argparse
import os
import glob
import subprocess
import shlex
import json

# arguments
# activation_key, file name, codec(default to mp3)
parser = argparse.ArgumentParser()
parser.add_argument("--code", help="Activation Code from audible to decrypt files")
parser.add_argument("-s","--single", help="Use this option to create a single file. This is false by default", action="store_true")
parser.add_argument("-d","--dpath", help="Use this to set the destination path. Otherwise I will use the current directory")
parser.add_argument("-v", "--verbose", help="Send output to stdout", action="store_true")
parser.add_argument("filename", help="Filename to convert, or directory to look in")

args = parser.parse_args()

act_byte = ""
metadata = ""
mode = ""
stats = ""

if args.dpath:
    path = args.dpath
else:
    path = os.getcwd()

if args.code:
    act_byte = args.code
elif os.path.isfile('./.authcode'):
    act_byte = open('./.authcode').readline()

if act_byte == "":
    print "Please provide an activation code from audible. Either at the command line or the .authcode file"

if args.single:
    mode = 'single'
else:
    mode = 'chapter'

if args.verbose:
    stats = "-stats"
else:
    stats = "-nostats"


def getmetadata(aaxfile):
    ret = subprocess.check_output(["ffprobe", "-v", "quiet", "-hide_banner", "-show_format", "-show_chapters", "-print_format", "json", os.path.abspath(aaxfile)])
    mdata = json.loads(ret)
    return mdata


def getmetabitrate():
    bit_rate = metadata['format']['bit_rate']
    return bit_rate[:2]


def getmetadatatags(key):
    # get specific data
    tag = metadata['format']['tags'][key]
    return tag


def reencode(aaxfile, outpath):
    # decrypt and reencode to mp3
    command = ("ffmpeg -loglevel error {} -activation_bytes {} -i {} -vn -codec:a libmp3lame -ab {}k -map_metadata -1 "
               "-metadata \"title={}\" -metadata 'artist={}' -metadata 'album_artist={}' -metadata \"album={}\" -metadata 'date={}' "
               "-metadata track=1/1 -metadata 'genre={}' -metadata 'copyright={}' \"{}\" " ).format(stats, act_byte,aaxfile,getmetabitrate(),
                                                                                           getmetadatatags('title'), getmetadatatags('artist'),
                                                                                           getmetadatatags('album_artist'), getmetadatatags('album'),
                                                                                           getmetadatatags('date'), getmetadatatags('genre'),
                                                                                           getmetadatatags('copyright'),outpath)
    if args.verbose:
        print command
        process = subprocess.Popen(shlex.split(command), stdout=subprocess.PIPE)
        while True:
            output = process.stdout.readline()
            if output == '' and process.poll() is not None:
                break
            if output:
                print output.strip()
        rc = process.poll()
        return rc
    else:
        process = subprocess.call(shlex.split(command))
    return 


def getchaptercount():
    # Get the number of chapters
    ccount = metadata['chapters']
    return len(ccount)


def getchaptermetadata(cid, key):
    # get the Chapter metadata
    for i in metadata['chapters']:
        if i['id'] == cid:
            return i[key]

def movetochapters(path, outpath, chapter, title, start,end):
    # Creating individual chapters

    outfile = "{}/Ch - {} {}.mp3".format(outpath, chapter, title)
    command = "ffmpeg -loglevel error {} -i \"{}\" -ss {} -to {} -codec:a copy -metadata 'track={}' \"{}\"".format(stats, path,
                                                                                                               start, end,
                                                                                                               chapter, outfile)
    if args.verbose:
        print command
        process = subprocess.Popen(shlex.split(command), stdout=subprocess.PIPE)
        while True:
            output = process.stdout.readline()
            if output == '' and process.poll() is not None:
                break
            if output:
                print output.strip()
        rc = process.poll()
        return rc
    else:
        process = subprocess.call(shlex.split(command))
    return


def getcoverart(path,outpath):
    # Pull the coverart from the file
    command = "ffmpeg -loglevel error -activation_bytes {} -i \"{}\" -an -codec:v copy \"{}/cover.jpg\"".format(act_byte,
                                                                                                               path, outpath)
    if args.verbose:
        print command
    process = subprocess.call(shlex.split(command))
    return

for rfile in glob.glob(args.filename):
    if rfile.find("aax") != -1 and os.path.isfile(rfile):
        metadata = getmetadata(rfile)
        album = getmetadatatags('album')
        artist = getmetadatatags('artist')
        title = getmetadatatags('title')
        ddir = "%s/%s/%s" % (path, artist, title)
        single_file_path = "%s/%s.mp3" % (ddir, title)
        if not os.path.exists(ddir):
            os.makedirs(ddir)
        print ddir
        reencode(rfile, single_file_path)
        if mode == 'chapter':
            chapter = 0
            numchapters = getchaptercount()
            while (numchapters > 0 ):
                cstart = getchaptermetadata(chapter, 'start_time')
                cend = getchaptermetadata(chapter, 'end_time')
                chapter += 1
                numchapters -= 1
                schap = str(chapter).zfill(2)
                movetochapters(single_file_path, ddir, schap, title, cstart,cend)
            os.remove(single_file_path)
        getcoverart(rfile, ddir)