#!/bin/bash
#-----------------------------------------------------------------------------------------------------------------------------------
#
# Album MetaData Save
#
# Copyright (C) 2016-2026 Arnaud G. GIBERT
# mailto:arnaud@rx3.net
#
# This is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; If not, see
# <https://www.gnu.org/licenses/>.
#
#-----------------------------------------------------------------------------------------------------------------------------------



#-----------------------------------------------------------------------------------------------------------------------------------
# Includes
#-----------------------------------------------------------------------------------------------------------------------------------

: "${RX3_LIB_DIR:=/usr/lib/rx3}"
. "${RX3_LIB_DIR}/music_tools.bash"





#-----------------------------------------------------------------------------------------------------------------------------------
# Global Variables
#-----------------------------------------------------------------------------------------------------------------------------------

declare -g       VERSION="1.0.0"
declare -g          NAME="album_metadata_save"
declare -g          HELP="usage: [-h | --help] | [-V | --version] | [-T | --test] [-v | --verbose] [-f | --factoring] [-s | --standardising] <Source_Dir> <MetaData_File>"

declare -g     FACTORING="FALSE"
declare -g STANDARDISING="FALSE"
declare -g    SOURCE_DIR=""
declare -g METADATA_FILE=""

declare -g          MODE="DEFAULT"
declare -g       VERBOSE="FALSE"
declare -g       DRY_RUN="FALSE"





#-----------------------------------------------------------------------------------------------------------------------------------
# Version Print
#-----------------------------------------------------------------------------------------------------------------------------------

ams_version_print()
{
    version_print
}





#-----------------------------------------------------------------------------------------------------------------------------------
# Help Print
#-----------------------------------------------------------------------------------------------------------------------------------

ams_help_print()
{
    ams_version_print
    help_print
}





#-----------------------------------------------------------------------------------------------------------------------------------
# Arg Parse
#-----------------------------------------------------------------------------------------------------------------------------------

ams_args_parse()
{
    tmp_args=$(getopt -o ThVvfs --long test,help,version,verbose,factoring,standardising -n "${NAME}" -- "$@")

    if [ $? != 0 ]; then echo "Terminating..." >&2; exit 1; fi

    eval set -- "${tmp_args}"

    while true
    do
        case "$1" in
            # Mode switches
            -T|--test)                     MODE="TEST";                    shift;;
            -h|--help)                     MODE="EXIT"; ams_help_print;    shift;;
            -V|--version)                  MODE="EXIT"; ams_version_print; shift;;

            # Global options
            -v|--verbose)               VERBOSE="TRUE";                     shift;;
            -f|--factoring)           FACTORING="TRUE";                     shift;;
            -s|--standardising)   STANDARDISING="TRUE";                     shift;;

            --)                                                             shift;  break;;
            *) echo_error "args_parse internal error [$1]!";                        exit 1;;
        esac
    done

    if [[ "${MODE}" != "EXIT" ]]
    then
        if [[ "${#}" != "2" ]]
        then
            if [[ "${#}" -lt "2" ]]
            then
                echo_error "Not enough args!"
            else
                echo_error "Too many args!"
            fi

                     MODE="EXIT"
            ams_help_print
        else
               SOURCE_DIR="$1"
            METADATA_FILE="$2"
        fi
    fi
}





#-----------------------------------------------------------------------------------------------------------------------------------
# Main
#-----------------------------------------------------------------------------------------------------------------------------------

ams_args_parse "$@"



if [[ "${MODE}" == "EXIT" ]]
then
    exit 0
else
    if [[ "${MODE}" == "TEST" ]]
    then
        DRY_RUN="TRUE"
    fi
fi


echo_error "${NAME}: Mode: [${MODE}]   Verbose: [${VERBOSE}]   Factoring: [${FACTORING}]   Standardising: [${STANDARDISING}]   Source_Dir: [${SOURCE_DIR}]   MetaData_File: [${METADATA_FILE}]"

find "${SOURCE_DIR}" -maxdepth 1 -name '*.flac' -o -name '*.mp3' | sort |
    (
        nb_track=0

        mt_tagtab_alloc

        while read track_file
        do
            nb_track=$((nb_track + 1))

            if [[ "${FACTORING}" == "TRUE" ]]
            then
                mt_tagtab_read "${nb_track}" "${track_file}" "FACTORING"
            else
                mt_tagtab_read "${nb_track}" "${track_file}" "NOFACTORING"
            fi
        done
                
        track_id=0

        while [[ "${track_id}" -le "${nb_track}" ]]
        do
            if [[ "${track_id}" == 0 ]]
            then
                echo "DEF"
            else
                echo "SOT"
            fi

            if [[ "${STANDARDISING}" == "TRUE" ]]
            then
                mt_tagtab_dump "${track_id}" "STANDARD"
            else
                mt_tagtab_dump "${track_id}" "PASSTHROUGH"
            fi

            echo "EOT"

            track_id=$((track_id + 1))
        done

        echo "EOA"

        echo 1>&2 "NB Track dumped: [${nb_track}]"
    ) |
    (
        if [[ "${DRY_RUN}" == "TRUE" ]]
        then
            cat
        else
            tee "${METADATA_FILE}"
        fi
    ) |
    (
        if [[ "${VERBOSE}" == "TRUE" ]]
        then
            cat
        else
            cat >/dev/null
        fi
    )