#!/bin/bash

# doc gen_metatrack {
#
# DESCRIPTION
#   gen_metatrack - Generates track specific metadata using image file
#
# USAGE
#   gen_metatrack </path/to/flac/file> </path/to/cue/file>
#
# DEPENDENCIES src/gen_tracks
#
# }

gen_metatrack() {
    while true; do
        case ${1} in
            (-c) local CUE="${2}"; shift 2 ;;
            (*) local fileList=(${@}); local TOTALTRACKS=${#fileList[@]}; break ;;
        esac
    done
  
    
    if [[ -n "${CUE}" ]]; then
        gen_tracks "${_OPT_TMP}" "${fileList}" "${CUE}" >/dev/null 2>&1
        local TOTALTRACKS="$(grep -e "TRACK [0-9][0-9] AUDIO" "${CUE}" | wc -l)"
        local COUNT=0
        while [[ ${COUNT} -lt ${TOTALTRACKS} ]]; do
            local fileList[${COUNT}]=$(printf "${_OPT_TMP}/split-track%02d.flac\t" $(( ${COUNT} + 1 )))
            local COUNT=$(( ${COUNT} + 1 ))
        done
    fi

    local replaygainList=($(metaflac --scan-replay-gain ${fileList[@]} | awk 'BEGIN{ORS=" ";FS=":"}{print $2}' | tr ' ' '\t'))
    local REPLAYGAIN_ALBUM_GAIN=${replaygainList[0]}
    local REPLAYGAIN_ALBUM_PEAK=${replaygainList[1]}
    local trackidList=($(metaflac --list --block-number=0 ${fileList[@]} | awk 'BEGIN{FS=": "}{if($2==" MD5 signature") {print $3}}'))
    local durationList=($(soxi -D ${fileList[@]}))

    local COUNT=0
    while [[ ${COUNT} -lt ${TOTALTRACKS} ]]; do
        local TRACKID=${trackidList[${COUNT}]}
        local DURATION=${durationList[${COUNT}]}
        local REPLAYGAIN_TRACK_GAIN=${replaygainList[$(( $(( ${COUNT} * 4 )) + 2 ))]}
        local REPLAYGAIN_TRACK_PEAK=${replaygainList[$(( $(( ${COUNT} * 4 )) + 3 ))]}
        echo "TRACKID=${TRACKID};DURATION=${DURATION};REPLAYGAIN_ALBUM_GAIN=${REPLAYGAIN_ALBUM_GAIN};REPLAYGAIN_ALBUM_PEAK=${REPLAYGAIN_ALBUM_PEAK};REPLAYGAIN_TRACK_GAIN=${REPLAYGAIN_TRACK_GAIN};REPLAYGAIN_TRACK_PEAK=${REPLAYGAIN_TRACK_PEAK}"
        local COUNT=$(( ${COUNT} + 1 ))
    done
}