import itertools as ITT
import json
import os
import subprocess as SP
import sys
import time
from glob import glob

import cffi
from datetime import timedelta
from dvdnav import DVDError, DVDNav
from dvdread import DVDRead
from ff_d2v import make_d2v, make_meta
from vob_demux import demux

def close_file_del_if_empty(fh):
    if not fh:
        return False
    if fh.tell() == 0:
        fh.close()
        os.unlink(fh.name)
        return False
    else:
        fh.close()
        return True


dur_thr = 60.0

def process_m2v_files(path):
    for file in glob(os.path.join(path,"**", "*.m2v")):
        make_meta(file)
        make_d2v(file)


for dvd_path in ITT.chain.from_iterable(map(glob, sys.argv[1:])):
    r = DVDRead(dvd_path)
    # r.grab_ifos()
    # r.grab_vobs()
    # exit()
    if os.path.isfile(dvd_path):
        basename = os.path.splitext(os.path.basename(dvd_path))[0]
    else:
        basename = r.iso_disc_name or r.udf_disc_name
    base_dir = os.path.join("out", "_".join([basename, r.disc_id]).replace(" ", "_"))
    if os.path.isdir(base_dir):
        print(f"Output foldrer {base_dir} exists, remove to re-rip DVD")
        process_m2v_files(base_dir)
        continue
    os.makedirs(base_dir, exist_ok=True)
    d = DVDNav(dvd_path)
    to_demux = []
    for k, v in d.titles.items():
        out_folder=os.path.join(base_dir,f"t{k:03}")
        v["duration"] = v["duration"].total_seconds()
        if v["chapters"]:
            v["chapters"] = [0.0]+[c.total_seconds() for c in v["chapters"]]
            avg_chapter_len = v["duration"] / len(v["chapters"])
            # if avg_chapter_len<10:
            #     continue
        d.titles[k] = v
        # if not v.get('audio'):
        #     print(f"[{k}|0] Skipping title {k} because it has no audio tracks")
        #     continue
        # if not v.get('vts'):
        #     print(f"[{k}|0] Skipping title {k} because it has no title sets")
        #     continue
        if v["duration"] < dur_thr:
            print(
                f"[{k}|0] Skipping title {k} because it is shorter than {dur_thr} seconds ({v['duration']} seconds)"
            )
            continue
        os.makedirs(out_folder, exist_ok=True)
        with open(os.path.join(out_folder, f"title.json"), "w") as fh:
            json.dump(d.titles[k], fh, indent=4)
        with open(os.path.join(out_folder, f"chapters.txt"), "w") as fh:
            if set(v["chapters"])==set([0.0]):
                continue
            for n,t in enumerate(v["chapters"],1):
                if abs(t-v["duration"])<1.0:
                    continue
                print(f"CHAPTER{n:02}={timedelta(seconds=t)}",file=fh)
                print(f"CHAPTER{n:02}NAME=Chapter {n}",file=fh)
        for a in range(0, 99):
            outfile = os.path.join(out_folder, f"{a:03}.vob")
            to_demux.append(outfile)
            fh = open(outfile, "wb")
            try:
                for block in d.get_blocks(k, a):
                    fh.write(block)
            except DVDError as e:
                if str(e) != "Invalid angle specified!":
                    raise
            close_file_del_if_empty(fh)
    to_demux = list(filter(os.path.isfile, to_demux))
    for file in to_demux:
        demux(file)
        os.unlink(file)
    process_m2v_files(base_dir)