#!/usr/bin/env python3

import argparse
import subprocess
import os
from datetime import datetime
from playsound import playsound
import time
import re
import shutil

DEFAULT_DVD_DEVICE = "/dev/cdrom"
TMP_DIR = "tmp"
RIPPED_DIR = "ripped"
LOGFILE = "rip.log"
NOTIFICATION_SOUND = "bell.oga"

SERIES_TITLE_REGEX = r"S\d+[ _]?E(\d+)(-(\d+))?$"
MAX_FILENAME_LEN_IN_TMP = 25  # dvdbackup cuts name of output files at 33 chars
WAIT_FOR_DEVICE_TIME_SECONDS = 3


def main():
    program_start_time = time.time()
    args = parse_args()

    if args.type == "series":
        validate_series_title(args.title)
    chdir_to_script_dir()
    mkdirs()

    dst = os.path.join(RIPPED_DIR, args.type, args.title)
    if os.path.exists(dst):
        print(
            f"A {args.type} with this name has already been ripped. Are you sure you spelled the name right?"
        )
        exit(1)

    if args.wait:
        wait_for_dev_to_exist(args)
        wait_for_dev_to_be_readable(args)

    success = rip_to_tmp_dir(args)
    program_execution_time_str = get_program_execution_time_str(program_start_time)
    if success:
        mv_ripped_from_tmp_to_ripped_dir(args)
        write_to_logfile(args, "Success")
        notify_ripping_success(args, program_execution_time_str)
    else:
        write_to_logfile(args, "FAILURE")
        notify_ripping_error(args, program_execution_time_str)

    print("Deleting tmp directory")
    delete_tmp_dir()


def parse_args():
    parser = argparse.ArgumentParser(description="Rip content of dvds")
    parser.add_argument(
        "type",
        choices=("movie", "series"),
        help="If the dvd contains one movie, or multiple episodes of a series",
    )
    parser.add_argument(
        "title",
        help='The title of the movie. Series must end with "Sx Ex-x". E.g.: "Lost S01 E1-04"',
    )
    parser.add_argument(
        "--dev",
        help=f"Dvd device to rip from. Defaults to {DEFAULT_DVD_DEVICE}",
        default=DEFAULT_DVD_DEVICE,
    )

    parser.add_argument(
        "--wait", help=f"Wait for dvd device to exist.", action="store_true"
    )

    return parser.parse_args()


def validate_series_title(title):
    if not is_series_title_valid(title):
        print("Invalid series title!")
        exit(1)


def is_series_title_valid(title):
    try:
        episode_matches = re.search(SERIES_TITLE_REGEX, title)
        if episode_matches is None:
            return False
        episode_from = int(episode_matches.group(1))
        episode_to = episode_matches.group(3)
        if episode_to:
            episode_to = int(episode_to)
        else:
            episode_to = episode_from

        if episode_from <= episode_to:
            return True
    except:
        return False

    return False


def chdir_to_script_dir():
    os.chdir(os.path.dirname(__file__))


def mkdirs():
    os.makedirs(TMP_DIR, exist_ok=True)
    os.makedirs(RIPPED_DIR, exist_ok=True)
    os.makedirs(os.path.join(RIPPED_DIR, "movie"), exist_ok=True)
    os.makedirs(os.path.join(RIPPED_DIR, "series"), exist_ok=True)


def write_to_logfile(args, tag):
    date = datetime.now().strftime("%d.%m.%Y %H:%M:%S")
    log_line = f'{date} - {args.type} - "{args.title}" - {tag}'

    with open(LOGFILE, "a") as file:
        file.write(log_line + "\n")


def wait_for_dev_to_exist(args):
    while not os.path.exists(args.dev):
        print(
            f"Device {args.dev} not found. Waiting {WAIT_FOR_DEVICE_TIME_SECONDS} sec..."
        )
        time.sleep(WAIT_FOR_DEVICE_TIME_SECONDS)


def wait_for_dev_to_be_readable(args):
    while not is_dvd_readable(args):
        print(
            f"Device {args.dev} found, but not readable. Waiting {WAIT_FOR_DEVICE_TIME_SECONDS} sec..."
        )
        time.sleep(WAIT_FOR_DEVICE_TIME_SECONDS)


def is_dvd_readable(args):
    command = create_info_command(args)
    proc = subprocess.run(command, stdout=subprocess.DEVNULL, stderr=subprocess.STDOUT)
    return proc.returncode != 255


def rip_to_tmp_dir(args) -> bool:
    """Returns: success of command"""
    command = create_rip_command(args, TMP_DIR)
    proc = subprocess.run(command)

    return proc.returncode == 0


def create_info_command(args):
    return ["dvdbackup", "-i", args.dev, "-I"]


def create_rip_command(args, dest):
    shortened_title = shorten_title(args)
    return [
        "dvdbackup",
        "-v",
        "-p",
        "-i",
        args.dev,
        "-o",
        dest,
        "-M",
        "-n",
        shortened_title,
    ]


def get_program_execution_time_str(program_start_time):
    program_execution_time_minutes = (time.time() - program_start_time) / 60.0
    program_execution_time_minutes = max(0.0, program_execution_time_minutes)
    return f"{program_execution_time_minutes:.1f} minutes"


def notify_ripping_success(args, program_execution_time_str):
    print(f"Success! Ripping took {program_execution_time_str}")
    send_notification(
        f'{args.type.capitalize()} "{args.title}" ripped successfully in {program_execution_time_str}!'
    )
    playsound(NOTIFICATION_SOUND)


def notify_ripping_error(args, program_execution_time_str):
    print(f"Ripping failure after {program_execution_time_str}")
    send_notification(
        f'Error ripping {args.type.capitalize()} "{args.title}" after {program_execution_time_str}!'
    )
    playsound(NOTIFICATION_SOUND)


def send_notification(text):
    subprocess.run(
        ["notify-send", text],
        shell=False,
    )


def mv_ripped_from_tmp_to_ripped_dir(args):
    shortened_title = shorten_title(args)
    src = os.path.join(TMP_DIR, shortened_title)
    dst = os.path.join(RIPPED_DIR, args.type, args.title)

    shutil.move(src, dst)


def shorten_title(args):
    return args.title[-MAX_FILENAME_LEN_IN_TMP:]


def delete_tmp_dir():
    try:
        os.rmdir(os.path.join(TMP_DIR))
    except FileNotFoundError:
        pass
    except OSError:
        print("Failed deleting due to OSError")


if __name__ == "__main__":
    main()