change_photo_album

#! /usr/bin/env bash

set -eu
shopt -s nocasematch

declare -r BASE_DIR="$(dirname "$(readlink -e "$0")")"
source "$BASE_DIR/lib/directories.sh"
source "$BASE_DIR/lib/photoid.sh"

PATH="$BASE_DIR/metadata:$BASE_DIR:$PATH"

while getopts "ctao" opt; do
    case $opt in
        c ) shopt -u nocasematch;;
        t ) CHANGE_PHOTO_TITLES_TO_ALBUM_NAME=;;
        a ) ADD_NEW_ALBUM_KEYWORD=;;
        o ) REMOVE_OLD_ALBUM_KEYWORD=;;
	esac
done
shift $(expr $OPTIND - 1 )

declare -r ALBUM=$(echo "${1:-}" | tr ' ' '-')
if [[ -z $ALBUM ]]; then
    echo "[ERROR] Album parameter missing" >&2
    exit 1
elif [[ -f $ALBUM || -d $ALBUM ]]; then
	echo "[ERROR] Album parameter is a file or directory" >&2
	exit 1
fi
shift 1

set -o pipefail
collect_associated_files "$@" | while read -r file; do 
    
    old_album_path=$(directories_get_albumpath_from_file "$file")
    old_album=${old_album_path##*/}

    if [[ $old_album = $ALBUM ]]; then
        echo "[WARN] Cannot change album of $file to \"$ALBUM\", same as old album" >&2
        continue
    fi

    relative_to_album_path=${file#$old_album_path/}
    new_album_parent=${old_album_path%/*}
    newfullpath="$new_album_parent/$ALBUM/$relative_to_album_path"

    if ! [[ -e $(dirname "$newfullpath") ]]; then
        mkdir --parents "$(dirname "$newfullpath")"
    elif [[ -e $newfullpath ]]; then
        echo "[ERROR] Cannot change album of $file, file exists already in \"$ALBUM\": $newfullpath" >&2
        continue
    fi
    
    mv "$file" "$newfullpath"
    test -v REMOVE_OLD_ALBUM_KEYWORD && update_keywords "-$old_album" "$newfullpath"
    test -v ADD_NEW_ALBUM_KEYWORD && update_keywords "$ALBUM" "$newfullpath"
    if [[ -v CHANGE_PHOTO_TITLES_TO_ALBUM_NAME ]]; then
        old_photoid=$(photoid_get_from_file "$newfullpath")
        new_photoid=$(photoid_set_title "$old_photoid" "$ALBUM")
        set_photoid "$newfullpath" "$new_photoid"
        renamed_file="$(dirname "$newfullpath")/$new_photoid.${newfullpath#*.}"
        # TODO we could do this a bit more cleverly, without an additional move
        mv "$newfullpath" "$renamed_file"
    fi
    
    echo "$newfullpath"
done