#!/usr/bin/env bash

# Published under GNU General Public License, version 3 (GPL-3.0)
# Author Stefan Rueger, 2026

progname=$(basename "$0")
adopts=()
mem=test
rand=$(shuf -i 1-1024 -n 1)
avrdude_bin=avrdude

Usage() {
cat <<END
Syntax: $progname [<opts>] <programmer> <part>
Function: test AVRDUDE v 8.3 or later with -c programmer -p part; on
  error leave the file log-<programmer>-<part>-<n>.txt for inspection
Options:
  -r <n>     Test using random contents seeded by <n>
  -e <exe>   Path of the avrdude executable
  -f         Emulate factory reset by erasing eeprom and flash only
  -a <opt>   Pass option <opt> to avrdude; no space in <opt>, eg, -Pch340
  -m <mlist> Use memory list <mlist> instead of test
  -h         Show usage and exit

Examples:
    $ test9 avrisp2 t13a
    $ test9 snap_isp m328p

Note:
  The contents of the chip will be overwritten with test data
END
}

reset="factory reset"
while getopts ":r:a:e:m:fh" opt; do
  case ${opt} in
     r) rand=0; [[ ! -z "$OPTARG" ]] && rand="$OPTARG"
        ;;
     a) if [[ ! -z "$OPTARG" ]]; then adopts+=("$OPTARG"); fi
        ;;
     e) avrdude_bin="$OPTARG"
        ;;
     f) reset="erase flash; erase eeprom; flush"
        ;;
     m) if [[ ! -z "$OPTARG" ]]; then mem="$OPTARG"; fi
        ;;
     h) Usage; exit 1
        ;;
    --) shift;
        break
        ;;
   \?) echo "$progname: invalid option -$OPTARG" 1>&2
       Usage; exit 1
       ;;
   : ) echo "$progname: invalid option -$OPTARG requires an argument" 1>&2
       Usage; exit 1
       ;;
  esac
done
shift $((OPTIND -1))


if [ $# -ne 2 ]; then
  why=missing; [ $# -gt 2 ] && why="too many"
  echo $progname: $why arguments
  Usage
  exit 1
fi


######
# Test file

how="random=$rand"
tmem=${mem}_; [[ "$mem" == "test" ]] && tmem=""
ftest="dry:$tmem${how}_holes"

######
# Actual test

if ! $avrdude_bin "${adopts[@]}" -c "$1" -p "$2" -D -T "$reset" -U "$mem:w:$ftest"; then
  echo -------------------------------
  echo Re-running to create error logs
  $avrdude_bin "${adopts[@]}" -vv -c "$1" -p "$2" -D -T "$reset" -U "$mem:w:$ftest" -l "log-$1-$2-$rand.txt"
fi