#!/bin/bash

# this program may format you harddisk, frighten your cat or simply
# do what you want - no warranties
###################################################################
# 
# look for unlinked vdr recordings on secondary video-directory
#
###################################################################

# enter your primary video directory here
VIDEO_DIR=/media/video0

#####################################################
# you may not want to change anything after this line

#set -x 
unset LANG
export LC_ALL=C

VIDEO_BASE=$(echo $VIDEO_DIR | sed 's/[0-9]*$//')
MARK_FILE=lostchk.vdr

if [ "$VIDEO_DIR" == "$VIDEO_BASE" ]; then
    echo "$VIDEO_DIR is not base of a distributed video directory"
    exit 1
fi

VIDEO_DIGITS=$(( ${#VIDEO_DIR} - ${#VIDEO_BASE} ))

get_video_dir() {
    local INDEX="$1"
    local POSTFIX="000$INDEX"
    echo "$VIDEO_BASE${POSTFIX: $(( - $VIDEO_DIGITS )):$VIDEO_DIGITS}"
}

echo "prepeare" > /dev/stderr
i=0
while [ -a "$(get_video_dir $i)" ]; do
    find "$(get_video_dir $i)" -name "$MARK_FILE" -exec rm -f {} \;
    i=$(( $i + 1 ))
    echo -n "." > /dev/stderr
done

echo > /dev/stderr
echo "check recordings" > /dev/stderr

while read DIR; do
    touch "$DIR/$MARK_FILE"

    REC_NAME="${DIR#$VIDEO_DIR}"
    REC_NAME="${REC_NAME#/}"
    i=1
    while true; do
        REC="00$i"
        REC="${REC: -3:3}.vdr"
        REC_FILE="$DIR/$REC"
        if [ -e "$REC_FILE" ]; then
            if [ -h "$REC_FILE" ]; then
                LINK_DEST="$(readlink "$REC_FILE")"
                DEST_DIR="$(dirname "$LINK_DEST")"
                touch "$DEST_DIR/$MARK_FILE"
            fi
        else
            break;
        fi
        i=$(( $i + 1 ))
    done
    echo -n "." > /dev/stderr
done < <(find "$VIDEO_DIR" -name "*.rec" -o -name "*.del")

echo > /dev/stderr
echo "find lost recordings" > /dev/stderr

i=0
while [ -e "$(get_video_dir $i)" ]; do
    while read DIR; do
        if [ '!' -e "$DIR/$MARK_FILE" ]; then
            echo > /dev/stderr
            echo $DIR
        fi
        echo -n "." > /dev/stderr
    done < <(find "$(get_video_dir $i)" -name "*.rec" -o -name "*.del")
    i=$(( $i + 1 ))
done

echo > /dev/stderr
echo "clean up" > /dev/stderr

i=0
while [ -a "$(get_video_dir $i)" ]; do
    find "$(get_video_dir $i)" -name "$MARK_FILE" -exec rm -f {} \;
    i=$(( $i + 1 ))
    echo -n "." > /dev/stderr
done

echo > /dev/stderr