#!/bin/bash

# This is a script to save Youtube videos to your computer, in a fashion that Plex would easily understand
# Created by Pranav Mishra. Last updated March 7, 2020

# --------------------------------------------------------------------------------------------------
# MIT License

# Copyright (c) 2019-2020 Pranav Mishra
# Online repository at https://github.com/pranavmishra90

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# --------------------------------------------------------------------------------------------------

#Dependencies
# 1. youtube-dl
# 2. jq
# 3. AtomicParseley
# 4. ffmpeg


# Variables you need to change

    # Set a location where you want the videos downloaded
    # You should create a "Youtube" directory within your Plex library folder
    youtubedirectory=$(echo "/volume1/Plex-Media/Youtube/TV-on-Youtube")
    resolution=$(echo 'height<=720')
    
# Recommendations
#   1. Add an alias for this script so that you can call it quickly after SSHing from anywhere (great for mobile use)
#   2. Adjust the maximum resolution based on personal usage (720p for fast streaming, higher resolutions for archival purposes)
#   3. Keep your youtube directory inside your Plex directory. It allows you to migrate you library easier, if required
    
# -----------------------------------------------------------------------------
# Do not edit below this line, unless you are testing mods to the script
# -----------------------------------------------------------------------------





# When the script runs, it will ask you to paste the Youtube video link
# The link is saved into variable $vidurl
read -p "Paste the youtube video link: " vidurl

# Get the Youtube Channel Name
userdir=$(/usr/local/bin/youtube-dl -j --flat-playlist "$vidurl" | jq -r '.uploader')

# Create a subdirectory for the Youtube Channel if one does not exist, then go to that folder
mkdir -p "$youtubedirectory"/"$userdir"
cd "$youtubedirectory"/"$userdir"

# Get the year the Youtube video was uploaded. This will be passed into the filename after the S for Season. (ie S2014 for the year 2014)
# Youtube returns the entire date in the format YYYYMMDD
videoyear=$(/usr/local/bin/youtube-dl -j --flat-playlist "$vidurl" | jq -r '.upload_date')
# We want only the YYYY
seasonyear=${videoyear%????}


# -----------------------------------------------------------------------------
# Statistics on your Plex Server's exiting videos from this YouTube Channel
# -----------------------------------------------------------------------------
echo "----------------------------------------"
echo "The file will be downloaded to:"
pwd


# The total number of videos is FYI only
echo Exising number of videos by "$userdir" :
find . -type f -name '*.mp4' | wc -l | sed 's/ //g'
echo " "

# We need the number of videos already present for a given year in order to set the episode number for our incoming video
echo Exising number of videos by "$userdir" in year "$seasonyear":
ls *.mp4 | grep S"$seasonyear" | wc -l | sed 's/ //g' > index.txt #Current episode count is saved to index.txt

#Extracting the first line from index.txt and saving it to $vidcount
epnumber=$(head -1 index.txt 2>&1)
echo $epnumber

# Now we add +1 to the $vidcount to get the episode number for the current video
epnumber=$((epnumber+1))
index=$(printf "%02d\n" $epnumber) #Adding a padding zero

echo "The next file will be episode number: "
echo S"$seasonyear"E"$index"
echo "----------------------------------------"

# -----------------------------------------------------------------------------
# Downloading video using youtube-dl
# -----------------------------------------------------------------------------

#Go back to the youtube working directory within the plex media library
cd ..

/usr/local/bin/youtube-dl "$vidurl" \
-o "%(uploader)s/%(uploader)s - S${seasonyear}E${index} - %(title)s [%(upload_date)s] [%(id)s].%(ext)s" \
-f 'bestvideo[height<=720]+bestaudio[ext=m4a]/best[height<=720]' \
--merge-output-format mp4 \
--download-archive tv-on-youtube_downloaded.txt \
--write-thumbnail \
--write-sub --sub-lang en \
--ignore-errors --no-continue --no-overwrites --no-post-overwrites \
--embed-thumbnail --embed-subs \
--add-metadata

# youtube-dl switches explained
# -o    follow renaming scheme
# -f    download videos of a certain format
# --merge-output-format     saving videos as .mp4 files. This is required for thumbnails to be added (mkv does not work presently)
# --download archive    youtube-dl will save a list of all videos you download using this script into the text file provided. This prevents you from downloading the same video multiple times by mistake
# --write thumnail  saves a copy of the thumnail as .jpg alongside the video file. It will follow the same naming scheme as -o provides, allowing Plex to use the thumbnail
# --write-sub   saves an external subtitle file
# --sub-lang en only saving English subtitles
# --ignore-errors   if an error downloading the video is encountered, report it and proceed
# --no-continue Do not resume partially downloaded files (restart from beginning)
# --no-overwrites       Do not overwrite files
# --no-post-overwrites  Do not overwrite post-processing files
# --embed-thumnail  save the thumnail inside of the mp4 container
# --embed-subs  save the subtitle files inside of the mp4 container
# --add-metadata    Writes the video metadata (ie description) to the mp4 container. Will be picked up by Plex

echo "The file has been downloaded"
echo "-----------------------------"