#!/bin/bash

declare -A dots
folds=()
min_x=-1
min_y=-1

while read line; do
  if [[ $line == *','* ]]; then
    dots[$line]=1
  else
    folds+=( ${line#fold along } )
  fi
done

for fold in ${folds[@]}; do
  fold_axis=${fold%=*}
  fold_coord=${fold#*=}
  new_dots=()
  todel_dots=()
  
  if [[ $fold_axis == 'x' ]] && { [ $fold_coord -lt $min_x ] || [ $min_x -eq -1 ] ;}; then
    min_x=$fold_coord
  elif [[ $fold_axis == 'y' ]] && { [ $fold_coord -lt $min_y ] || [ $min_y -eq -1 ] ;}; then
    min_y=$fold_coord
  fi

  for dot in ${!dots[@]}; do
    dot_x=${dot%,*}
    dot_y=${dot#*,}
    if [[ $fold_axis == 'x' ]]; then
      if [ $dot_x -gt $fold_coord ]; then
        new_dots+=( "$((fold_coord*2-dot_x)),$dot_y" )
        todel_dots+=( $dot )
      fi
    else
      if [ $dot_y -gt $fold_coord ]; then
        new_dots+=( "$dot_x,$((fold_coord*2-dot_y))" )
        todel_dots+=( $dot )
      fi
    fi
  done

  for todel_dot in ${todel_dots[@]}; do
    unset dots[$todel_dot]
  done

  for new_dot in ${new_dots[@]}; do
    dots[$new_dot]=1
  done
done

for j in $(seq 0 $min_y); do
  for i in $(seq 0 $min_x); do
    if [ ${dots["$i,$j"]} ]; then
      echo -n '█'
    else
      echo -n ' '
    fi
  done
  echo
done