#!/bin/sh

error() {
    printf '\033[1;31m%s\033[0m %s\n' "ERROR:" "$1"
    shift
    exit "$1"
}

trap 'error "$error" "$?"' EXIT; set -e

error="Le premier argument doit être l'extension des fichiers à convertir."
[ -n "$1" ]; format_in="$1" ; shift
error="Le second argument doit être l'extension des fichiers convertis."
[ -n "$1" ]; format_out="$1"; shift

set +e; trap - EXIT

while [ -z "$input" ] ; do
    printf '%s' "Dossier à convertir : "
    read -r input
done

output=../output

set -e
cd "$input"
mkdir -p "$output"
set +e

case "$format_out" in
    mp3)
        options="-ab 320k"
        ;;
    *)
        ;;
esac

for file in **/*".${format_in}"; do
    while [ "$(jobs -p | wc -l)" -ge 10 ]; do
        sleep 1
    done
    basename "$file"
    output_file="${output}/$(dirname "$file")/$(basename "${file}" ".${format_in}").${format_out}"
    mkdir -p "$(dirname "${output_file}")"
    # shellcheck disable=SC2086
    ffmpeg -loglevel quiet -i "$file" $options "$output_file" &
done

wait