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+#!/bin/sh
+# File: show-manager.sh
+# Location: /mnt/public/Support/Programs/jellyfin/scripts/
+# Author: bgstack15
+# Startdate: 2024-02-18-1 17:24
+# SPDX-License-Identifier: GPL-3.0-only
+# Title: Slowly add new episodes of a completed show to jellyfin
+# Purpose: Check jellyfin for if the last season of a given show is greater than (x-2)/x episodes, and if so, then add that many new episodes.
+# History:
+# Usage:
+#    . ./jellystack-autocomplete.bash ; manage_show stsnw
+# Improve:
+#    hook in to jellyfin deeper, by checking file paths of the episodes where watched=True, to know which episodes to skip trying to add
+#    learn how to completely clear the "watched" information about the show in jellyfin.
+# Documentation:
+#    Assumptions:
+#       1. media files are sorted in "Season 01/" type directories.
+#       2. Media files are named "*s01e07 *" style which will be sorted alphabetically in episode number order.
+#       3. watched episodes are in exact order!
+#       4. input files are all mkv (this is to simplify filtering out non-episode files like images; it could be made more complex as needed)
+# Dependencies:
+#    jellystack_lib with watched_episodes_for_show()
+
+# flow:
+# get episodes-watched for last season of show (value is, e.g., "8/10"
+
+
+# depends on content being in "Season 01/" directories.
+get_episodes_watched_count() {
+   # input env vars: library, show, DEBUG
+   # output: prints watched= and total= numbers
+   # usage: $( library="TV" show="Star Trek: Strange New Worlds" get_episodes_watched_count )
+   _pyverbose=False
+   test -n "${DEBUG}" && _pyverbose=True
+   cd /mnt/public/Support/Programs/jellyfin/scripts
+   . ~/.config/jellystack.viewing.user
+   {
+      python3 <<-EOF
+import jellystack_lib
+a = jellystack_lib.get_authenticated_client(url="${server}",username="${username}",password="${password}")
+b = jellystack_lib.watched_episodes_for_show(a,"${library}","${show}","sum",${_pyverbose})
+c = b.split("/")
+print(f"watched={c[0]}")
+print(f"total={c[1]}")
+EOF
+   }
+}
+
+symlink_file() {
+   # input vars: infile SOURCE_DIR LINK_DIR LINK_PREFIX VERBOSE APPLY
+   # reference: printf '%s\n' *s01e0* | while read line ; do ln -sf "../../../off.movies/Star Trek - Strange New Worlds (2021/Season 01/${line}" "/mnt/public/Video/TV/Star Trek - Strange New Worlds (2021/Season 01/" ; done
+   # We now calculate season number based on file name
+   #season_num_str="$( \printf '%02d' "${season_num}" )"
+   base="$( basename "${infile}" )"
+   season_num_str="$( \printf '%02d' "$( echo "${base}" | grep -oE '\<s[0-9]+e[0-9]+' | awk -F'e' '{print $1}' | tr -dc '0-9' )" )"
+   test -n "${VERBOSE}" && echo ln -s "${LINK_PREFIX}/Season ${season_num_str}/${base}" "${LINK_DIR}/Season ${season_num_str}/"
+   test -n "${APPLY}" && ln -s "${LINK_PREFIX}/Season ${season_num_str}/${base}" "${LINK_DIR}/Season ${season_num_str}/"
+}
+
+list_sorted_episode_files() {
+   # input env vars: SOURCE_DIR
+   # if changing from %P, probably do a cd in a sub-shell.
+   find "${SOURCE_DIR}" -name '*mkv' -iregex '.*\<s[0-9]+e[0-9]+\>.*' -printf '%P\n' | sort -n
+}
+
+# Logic flow:
+# diff=total-watched
+# if diff < 2,
+#    find the smallest-number episode files and add them in.
+manage_show() {
+   # input vars: MAX_NEW_EPISODES SOURCE_DIR VERBOSE LIBRARY SHOW
+   # You may also run: manage_show "TV/Star Trek: Strange New Worlds"
+   conf="${1}"
+   test -f "/mnt/public/Support/Programs/jellyfin/scripts/input/${conf}.conf" && . "/mnt/public/Support/Programs/jellyfin/scripts/input/${conf}.conf"
+   # Not necessary with the conf file method
+   #test -z "${SHOW}" && test -z "${LIBRARY}" && {
+   #   LIBRARY="$( echo "${1}" | awk -F'/' '{print $1}' )"
+   #   SHOW="$( echo "${1}" | awk -F'/' '{print $2}' )"
+   #}
+   test -z "${MAX_NEW_EPISODES}" && MAX_NEW_EPISODES=2
+   # this next function sets vars: watched, total
+   eval $( library="${LIBRARY}" show="${SHOW}" get_episodes_watched_count )
+   # hardcode these to test max_new_episodes
+   #watched=6 total=8
+   diff=$((total-watched))
+   test -n "${VERBOSE}" && echo "Got watched=${watched} total=${total} diff=${diff}" 1>&2
+   if test ${diff:-0} -lt ${MAX_NEW_EPISODES} ;
+   then
+      need=$((MAX_NEW_EPISODES-diff))
+      echo "Must prepare next ${need} episodes." 1>&2
+      w1=$((watched+1))
+      end=$((watched+need))
+      list_sorted_episode_files | sed -n -r -e "${w1},${end}p" | while read infile ;
+      do
+         # VERBOSE and APPLY are used in this function:
+         infile="${infile}" symlink_file
+      done
+   fi
+}
+
+# Before the config file redesign, use one of these:
+# These will still get "/Season 01" prepended to the file basename:
+# SOURCE_DIR="/mnt/public/Video/off.movies/Star Trek - Strange New Worlds (2021)" LINK_DIR="/mnt/public/Video/TV/Star Trek - Strange New Worlds (2021)" LINK_PREFIX="../../../off.movies/Star Trek - Strange New Worlds (2021)" LIBRARY="TV" SHOW="Star Trek - Strange New Worlds (2021)" DIR="${SHOW}" manage_show