#!/bin/bash
set -Eeuo pipefail
escape_kid3() {
    printf '%s' "$1" | sed "s/'/'\\\\''/g"
}
DRY_RUN=false

if [[ "$1" == "--dry-run" ]]; then
    DRY_RUN=true
    shift
fi

if [[ $# -ne 1 ]]; then
    echo "Usage: $0 [--dry-run] file.txt"
    exit 1
fi

list="$1"

if [[ ! -f "$list" ]]; then
    echo "ERROR: File list not found: $list"
    exit 1
fi

while IFS= read -r file; do

    [[ -z "$file" ]] && continue

    if [[ ! -e "$file" ]]; then
        echo "ERROR: Missing file: $file"
        exit 1
    fi

    if [[ -d "$file" ]]; then
        echo "WARNING: Is a directory, skipping: $file"
        continue
    fi

    bookdir="$(dirname "$file")"
    booktitle="$(basename "$bookdir")"
    author="$(basename "$(dirname "$bookdir")")"

    echo
    echo "File:   $file"
    echo "Artist: $author"
    echo "Album:  $booktitle"

    if $DRY_RUN; then
        echo "DRY RUN: no changes made"
        continue
    fi

artist=$(escape_kid3 "$author")
album=$(escape_kid3 "$booktitle")

kid3-cli "$file" \
    -c "tag 1" \
    -c "set artist '$artist'" \
    -c "set album '$album'" \
    -c "tag 2" \
    -c "set artist '$artist'" \
    -c "set album '$album'" \
    -c save
done < "$list"