#!/bin/bash

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

. /usr/global/lib/music.bash





# System Constants
#-----------------------------------------------------------------------------------------------------------------------------------

   AM_NAME="album_merge"
AM_VERSION="$Name: album_merge-1_0_0-1 $"





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

function version_print()
{
    echo ${AM_VERSION} | sed -e 's/.*: //' -e 's/-/ /' -e 's/_/\./g' -e 's/\$$//'
}





# Prin Help
#-----------------------------------------------------------------------------------------------------------------------------------

function help_print()
{
    echo "${AM_NAME} [-h | --help] | [-V | --version] | [-T | --test] [-v | --verbose] <source_dir> <target_dir> <album_name> <prefix>"

}





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

function args_parse()
{
          mode="default"
       verbose="false"
    source_dir=""
    target_dir=""
    album_name=""
        prefix=""

    tmp_args=$(getopt -o ThVv --long test,help,version,verbose -n "${AM_NAME}" -- "$@")

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

    # Note the quotes around `$TEMP': they are essential!
    eval set -- "${tmp_args}"

    while true ; do
	case "$1" in
	    # Options

	    # Mode switches
            -T|--test)                                         mode="test";                   shift;;
	    -h|--help)                                         mode="exit";    help_print;    shift;;
	    -V|--version)                                      mode="exit";    version_print; shift;;

	    # Global options
            -v|--verbose)                                   verbose="true";                   shift;;

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

    if [[ "${mode}" != "exit" ]]
    then
	if [[ "${#}" != "4" ]]
	then
	    if [[ "${#}" -lt "4" ]]
	    then
		echo "Not enough args!"
	    else
		echo "Too many args!"
	    fi

	    mode="exit"
	    help_print
	else
	    source_dir="$1"
	    target_dir="$2"
	    album_name="$3"
	    prefix="$4"
	fi
    fi
}





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

shopt -s extglob

args_parse "$@"

if [[ ${mode} == "exit" ]]
then
    exit 0
else
    if [[ ${mode} == "test" ]]
    then
	dry_run=true
    else
	dry_run=false
    fi
fi



echo "mode: [${mode}]   verbose: [${verbose}]   source_dir: [${source_dir}]   target_dir: [${target_dir}]   album_name: [${album_name}]   prefix: [${prefix}]" 1>&2

for file in "${source_dir}"/*@(.flac|.mp3)
do
             id="$(basename $file | sed -e "s/-.*//")"
    target_file="${target_dir}/${prefix}$(basename $file)"

    cmd="cp \"${file}\" \"${target_file}\""
    exec_cmd "${cmd}"

    tag_delete "${target_file}" "ALBUM"
    tag_write  "${target_file}" "ALBUM"       "${album_name}"
    tag_delete "${target_file}" "TRACKNUMBER"
    tag_write  "${target_file}" "TRACKNUMBER" "${prefix}${id}"
done