#!/bin/bash

image_name () {

local tag; local efile

# generate a full image name with tag
# $1 name, $2 user(or repo), $3 repo  

# [[ $# -lt 1 ]] && echo "image base name required" && exit 

declare OPTION; declare OPTARG; declare OPTIND
while getopts 'e:ag:r:u:' OPTION; do
# echo processing: option:$OPTION argument:$OPTARG index:$OPTIND remaining:${@:$OPTIND}
case "$OPTION" in
e)
  efile=$OPTARG
  ;;  
r)  
    REPO=$OPTARG
    ;;
u)
    RUSER=$OPTARG
;;  
g)
    TAG=$OPTARG
    ;;    
a)  # add -arm64 to image
    arm=arm64
    ;;      
*)  echo unknown run option -$OPTARG
    echo "USAGE: tag <options>"
    echo "available options:  -a add -arm64 to tag, -d delete tag "
;;
esac
done

shift $((OPTIND - 1))
echo $efile
if [[ $efile ]]; then
    [[ ! -f $efile ]] && efile=$SDIR/$efile 
    if [[ -f $efile ]]; then
        source $efile
        [[ ! $? -eq 0 ]] && echo source of $efile failed, exiting && return 2
        else
        echo no environment file at $efile, exiting
        return 2
        fi
        echo "----------"
        echo loaded environment filen $efile
        cat $efile
    echo "----------"
fi

tag=$( echo $1 | cut -s -d ":" -f2)
tag=${tag:-$TAG}
name=${1%:*}
user=${2:-$RUSER}
repo=${3:-$REPO}  

tag=$([[ $repo ]] && echo ${repo}/)$([[ $user ]] && echo ${user}/)$name$([[ $arm ]] && echo -arm64):${TAG:-latest}

echo $tag

}

# if script was executed then call the function
(return 0 2>/dev/null) || image_name $@