#!/bin/bash

# doc print_trackids_to_imageids {
#
# DESCRIPTION
#   print_trackids_to_imageids - Prints the IMAGEIDs of all TRACKIDs.
#
# USAGE
#   print_trackids_to_imageids </path/to/db/file> <TRACKID_1> [<...>]
#
# }

print_trackids_to_imageids() {
    ## Argument parsing
    local DB_FILE="${1}"; shift
    local trackidList=(${@})
    
    ## Prints imageid of trackid if trackidList has only 1 element
    [[ ${#imageidList[@]} -eq 1 ]] && { awk -v trackid=${trackid} 'BEGIN{FS="\t"}{if($3==trackid){print $2}}' ${DB_FILE}; return 0; }
    
    ## Generates imageidList
    for trackid in ${trackidList[@]}; do
        local imageidList=(${imageidList[@]} $(awk -v trackid=${trackid} 'BEGIN{FS="\t"}{if($3==trackid){print $2}}' ${DB_FILE}))
    done

    awk '!seen[$0]++' <<<$(printf "%s\n" ${imageidList[@]}) 
    return 0
}