#!/bin/bash

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

. /usr/global/lib/music.bash





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

   AR_NAME="album_renum"
AR_VERSION="$Name: album_renum-1_0_0-1 $"





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

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





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

function help_print()
{
    echo "${AR_NAME} [-h | --help] | [-V | --version] | [-T | --test] [-v | --verbose] [ -f | --first_number <first_number>] [ -d | --number_of_digit <number_of_digit>] <source_dir> <target_dir>"
}





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

function args_parse()
{
               mode="default"
            verbose="false"
         source_dir=""
         target_dir=""
       first_number="1"
    number_of_digit="2"

    tmp_args=$(getopt -o f:d:ThVv --long first_number:,number_of_digit:,test,help,version,verbose -n "${AR_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
            -f|--first_number)                  shift; first_number="$1";                     shift;;
            -d|--number_of_digit)           shift;  number_of_digit="$1";                     shift;;

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

	mode="exit"
	help_print
    else
	source_dir="$1"
	target_dir="$2"
    fi
}





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

shopt -s extglob

args_parse "$@"

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



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

i="${first_number}"

for file in "${source_dir}"/*@(.flac|.mp3)
do

              j=$(printf "%0${number_of_digit}d" $i)
    target_file="${target_dir}/$(echo $(basename ${file}) | sed -e "s/^[0-9]*-/$j-/")";

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

    tag_delete "${target_file}" "TRACKNUMBER"
    tag_delete "${target_file}" "DISCNUMBER"
    tag_delete "${target_file}" "DISCTOTAL"
    tag_write  "${target_file}" "TRACKNUMBER" "$j"

    i=$(($i+1))
done