#  Copyright (c) 2014 Mathieu Malaterre <mathieu.malaterre@voxxl.com>
#
#  Redistribution and use is allowed according to the terms of the New
#  BSD license.
#  For details see the accompanying COPYING-CMAKE-SCRIPTS file.

# check md5 refs
#
# This script will be used to make sure we never introduce a regression on any
# of the nonregression file.
#
# The approach is relatively simple, we compute a md5sum for each of the decode
# file. Anytime the md5sum is different from the reference one, we assume
# something went wrong and simply fails.  of course if could happen during the
# course of openjpeg development that the internals are changed that impact the
# decoding process that the output would be bitwise different (while PSNR would
# be kept identical).

#message("0: ${REFFILE}")
#message("1: ${CMAKE_CURRENT_BINARY_DIR}")
#message("2: ${FILENAME}")
execute_process(
  COMMAND ${CMAKE_COMMAND} -E md5sum ${FILENAME}.png
  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/Temporary
  RESULT_VARIABLE res
  OUTPUT_VARIABLE output
  ERROR_VARIABLE  error_output
  OUTPUT_STRIP_TRAILING_WHITESPACE # important
)

# Pass the output back to ctest
if(res)
  message(SEND_ERROR "md5 could not be computed, it failed with value ${res}. Output was: ${error_output}")
endif()

#message("3: ${output}")

file(READ ${REFFILE} variable)
#message("4: ${variable}")
string(REGEX MATCH "^.*${FILENAME}.png" output_var ${variable})

#message("5: ${output_var}")

if("${output_var}" STREQUAL "${output}")
  #message("6: eqal")
else()
  message(SEND_ERROR "not equal: [${output_var}] vs [${output}]")
endif()