#!/bin/bash

###############################################################################
#             https://github.com/adrianamaglio/driglibash-arg
###############################################################################


# Usage :
#
# version="alpha nightly 0.0.1 pre-release unstable"
# summary="$0 [options] <device>"
# 
# usage[t]="Start qemu after the installation"
# varia[t]=tst
# tst=false
# 
# usage[i]="Install the provided package. Not implemented"
# varia[i]=install
# declare -a install
# 
# usage[k]="Keep the temporar mountpoints"
# varia[k]=keep
# keep=false
# 
# usage[e]="bash command file to execute in the chroot. - to read from stdin"
# varia[e]=execute
# declare -a execute

. driglibash-base

#TODO keep order usage options
# Print usage and exit in error
usage() {
  yell "Version: $version"
  yell "Usage: $summary"
  yell "Parameters:"
  yell "  -h print this help, version and exit."
  for key in "${!usage[@]}" ; do
    if [ "$(driglibash_arg_type "$key")" == "single_value" ] ; then
      name="${varia[$key]}"
      default=" (default : ${!name})"
    else
      default=
    fi
    yell "  -$key ${usage[$key]}$default"
  done
  exit 0
}

# Guess the variable type
# Boolean, list or string
driglibash_arg_type() {
  if [ $# -ne 1 ] ; then
    die "Bad driglibash_arg_type usage";
  fi

  name="${varia[$1]}"
  if [ "$name" == "" ] ; then die "Variable name is empty for key $1" ; fi
  if [ "${!name}" == "false" ] ; then
    echo "boolean"
  elif [ -n "$( declare -p "$name" 2>/dev/null | grep 'declare \-a')" ] ; then
    echo "array"
  else
    echo "single_value"
  fi
}

# Generate getopts string #
getopts_string=":h"
for key in ${!usage[@]} ; do
  needs_parameter=
  if [ "$(driglibash_arg_type "$key")" != "boolean" ] ; then needs_parameter=":" ; fi
  getopts_string="$getopts_string$key$needs_parameter"
done

# Loop throught options #
while getopts "$getopts_string" opt; do
  case $opt in
    h) usage;;
    :) die "Option -$OPTARG requires an argument.";;
    \?) die "Invalid option: -$OPTARG";;
    *)
      name="${varia[$opt]}"
      if [ "${!name}" == "false" ] ; then eval $name=true
      elif [ -n "$( declare -p "$name" 2>/dev/null | grep 'declare \-a')" ] ; then safe="${!name} $OPTARG" ; eval $name=\$safe
      else eval $name=\$OPTARG
      fi;;
  esac
done ; shift $((OPTIND-1))