#! /bin/bash
# This script tests: pamarith
# Also requires: pamchannel pamseq pamtopnm pgmmake pnmcat rgb3toppm

tmpdir=${tmpdir:-/tmp}
input1_pgm=${tmpdir}/input1.pgm
input2_pgm=${tmpdir}/input2.pgm
output_pgm=${tmpdir}/output.pgm
input1_ppm=${tmpdir}/input1.ppm
input2_ppm=${tmpdir}/input2.ppm

echo "Test 1"

pamseq 1 15 | pamtopnm -assume > ${input1_pgm}
pgmmake -maxval 15 0.15 16 1 > ${input2_pgm}

rgb3toppm ${input1_pgm} ${input1_pgm} ${input1_pgm} > ${input1_ppm} 
rgb3toppm ${input2_pgm} ${input2_pgm} ${input2_pgm} > ${input2_ppm} 

pnmcat -tb -plain ${input1_pgm} ${input2_pgm}

for fn in "-add" "-subtract" "-multiply" "-divide" "-difference" \
    "-minimum" "-maximum" "-mean" "-compare" \
    "-and" "-or" "-nand" "-nor"  "-xor" \
    "-shiftleft" "-shiftright"
  do
  echo ${fn}
  pamarith ${fn} -plain ${input1_pgm} ${input2_pgm} | tr '\n' ' '; echo
  pamarith ${fn} ${input1_pgm} ${input2_pgm} > ${output_pgm}
  rgb3toppm  ${output_pgm} ${output_pgm} ${output_pgm} | cksum
  pamarith ${fn} ${input1_ppm} ${input2_pgm} | cksum
  pamarith ${fn} ${input1_ppm} ${input2_ppm} | cksum
  done

rm ${input1_pgm} ${input2_pgm} ${output_pgm} ${input2_ppm}

echo "Test 2 (input = output)"
echo "cksum is 2425386270 41 or 2921940274 59"

for image in testgrid.pbm ${input1_ppm}
  do
  echo "input image"
  cat ${image} | cksum 
  for fn in "-minimum" "-maximum" "-mean" "-and" "-or"
    do
    echo ${fn}
    pamarith ${fn} ${image} ${image} | cksum
    done
  done


echo "Test 3 (blank output)"
echo "cksum is 2817549367 41 or 320101399 59"

for image in testgrid.pbm ${input1_ppm}
  do
  for fn in "-subtract" "-difference" "-xor"
    do
    echo ${fn}
    pamarith ${fn} ${image} ${image} | cksum
    done
  done

rm ${input1_ppm}


echo "Invalid command-line argument combinations." 1>&2
echo "Error messages should appear below the line." 1>&2
echo "-----------------------------------------------------------" 1>&2

echo "Test Error: Should print 1 twenty-two times"

output_ppm=${tmpdir}/output.ppm

for option in "-add -subtract" \
    "-multiply -divide" \
    "-difference -minimum" \
    "-maximum -mean" \
    "-compare -and" \
    "-or -nand" \
    "-nor -xor" \
    "-shiftleft -shiftright"
  do
  pamarith ${option} testimg.ppm testimg.ppm > ${output_ppm}
    echo $?
    test -s ${output_ppm}
    echo $?
  done

  pamarith -add testimg.ppm testimg.ppm testimg.ppm > ${output_ppm}
    echo $?
    test -s ${output_ppm}
    echo $?
  pamarith -add testimg.ppm testgrid.pbm > ${output_ppm}
    echo $?
    test -s ${output_ppm}
    echo $?
  pamchannel -infile testimg.ppm 0 1 | \
    pamarith -add testimg.ppm - > ${output_ppm}
    echo $?
    test -s ${output_ppm}
    echo $?

rm ${output_ppm}