#! /bin/bash
# This script tests: pamchannel
# Also requires: pamtopam pamtopnm

# Extract planes one by one.
# Convert output to pgm to make it identical to ppmtorgb3 output.

# $ ppmtorgb3 testimg.ppm ; cksum testimg.{red,grn,blu}
#
# 1571496937 33838 testimg.red
# 394856971 33838 testimg.grn
# 3164158573 33838 testimg.blu


# Test 1. red channel
# Should produce 1571496937 33838
echo "Test 1"

pamchannel -infile testimg.ppm 0 | \
  pamtopnm --assume | cksum

# Test 2. green channel
# Should produce  394856971 33838
echo "Test 2"

pamchannel -infile testimg.ppm -tupletype="GRAYSCALE" 1 | \
  pamtopnm | cksum

# Test 3. blue channel
# Should produce 3164158573 33838
echo "Test 3"

pamchannel -infile testimg.ppm 2 | \
  pamtopnm --assume | cksum

# Test invalid: specified channel does not exist

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

tmpdir=${tmpdir:-/tmp}
test_out=${tmpdir}/test_out

echo "Test Invalid"

pamchannel  -infile testgrid.pbm 1 > ${test_out} || \
   echo -n "Expected failure 1"; test -s ${test_out}; echo " "$?

pamchannel  -infile testimg.ppm 3 > ${test_out} || \
   echo -n "Expected failure 2"; test -s ${test_out}; echo " "$?

pamtopam testimg.ppm | pamchannel -infile=- 4 > ${test_out} || \
   echo -n "Expected failure 3"; test -s ${test_out}; echo " "$?

rm ${test_out}