# grepTest.cmake executes a command and captures the output in a file. File is then compared
# against a reference file. Exit status of command can also be compared.

# arguments checking
if (NOT TEST_PROGRAM)
  message (FATAL_ERROR "Require TEST_PROGRAM to be defined")
endif ()
if (NOT TEST_FOLDER)
  message (FATAL_ERROR "Require TEST_FOLDER to be defined")
endif ()
if (NOT TEST_OUTPUT)
  message (FATAL_ERROR "Require TEST_OUTPUT to be defined")
endif ()
if (NOT TEST_REFERENCE)
  message (FATAL_ERROR "Require TEST_REFERENCE to be defined")
endif ()
if (NOT TEST_FILTER)
  message (VERBOSE "Optional TEST_FILTER is not defined")
endif ()

if (EXISTS "${TEST_FOLDER}/${TEST_OUTPUT}")
  file (REMOVE ${TEST_FOLDER}/${TEST_OUTPUT})
endif ()

if (EXISTS "${TEST_FOLDER}/${TEST_OUTPUT}.err")
  file (REMOVE ${TEST_FOLDER}/${TEST_OUTPUT}.err)
endif ()

message (STATUS "COMMAND: ${TEST_EMULATOR} ${TEST_PROGRAM} ${TEST_ARGS}")

if (TEST_LIBRARY_DIRECTORY) # Directory to add to PATH
  if (WIN32)
    set (ENV{PATH} "$ENV{PATH};${TEST_LIBRARY_DIRECTORY}")
  elseif (APPLE)
    set (ENV{DYLD_LIBRARY_PATH} "$ENV{DYLD_LIBRARY_PATH}:${TEST_LIBRARY_DIRECTORY}")
  else ()
    set (ENV{LD_LIBRARY_PATH} "$ENV{LD_LIBRARY_PATH}:${TEST_LIBRARY_DIRECTORY}")
  endif ()
endif ()

if (TEST_ENV_VAR)
  set (ENV{${TEST_ENV_VAR}} "${TEST_ENV_VALUE}")
  message (TRACE "ENV:${TEST_ENV_VAR}=$ENV{${TEST_ENV_VAR}}")
endif ()

# run the test program, capture the stdout/stderr and the result var
execute_process (
    COMMAND ${TEST_EMULATOR} ${TEST_PROGRAM} ${TEST_ARGS}
    WORKING_DIRECTORY ${TEST_FOLDER}
    RESULT_VARIABLE TEST_RESULT
    OUTPUT_FILE ${TEST_OUTPUT}
    ERROR_FILE ${TEST_OUTPUT}.err
    OUTPUT_VARIABLE TEST_OUT
    ERROR_VARIABLE TEST_ERROR
)
message (STATUS "COMMAND Result: ${TEST_RESULT}")

message (STATUS "COMMAND Error: ${TEST_ERROR}")

# remove special regex text from the output
if (EXISTS "${TEST_FOLDER}/${TEST_OUTPUT}")
  file (READ ${TEST_FOLDER}/${TEST_OUTPUT} TEST_STREAM)
  string (FIND "${TEST_STREAM}" "_pmi_alps" TEST_FIND_RESULT)
  if (TEST_FIND_RESULT GREATER -1)
    string (REGEX REPLACE "^.*_pmi_alps[^\n]+\n" "" TEST_STREAM "${TEST_STREAM}")
    file (WRITE ${TEST_FOLDER}/${TEST_OUTPUT} ${TEST_STREAM})
  endif ()
  string (FIND "${TEST_STREAM}" "ulimit -s" TEST_FIND_RESULT)
  if (TEST_FIND_RESULT GREATER -1)
    string (REGEX REPLACE "^.*ulimit -s[^\n]+\n" "" TEST_STREAM "${TEST_STREAM}")
    file (WRITE ${TEST_FOLDER}/${TEST_OUTPUT} ${TEST_STREAM})
  endif ()
endif ()

# if the TEST_ERRREF exists grep the error output with the error reference
set (TEST_ERRREF_RESULT 0) # grep result variable; 0 is success
# TEST_ERRREF should always be matched
if (TEST_ERRREF)
  # if the .err file exists grep the error output with the error reference before comparing stdout
  if (EXISTS "${TEST_FOLDER}/${TEST_OUTPUT}.err")
    file (READ ${TEST_FOLDER}/${TEST_OUTPUT}.err TEST_ERR_STREAM)
    list (LENGTH TEST_ERR_STREAM test_len)
    # verify there is text output in the error file
    if (test_len GREATER 0)
      string (REGEX MATCH "${TEST_ERRREF}" TEST_MATCH ${TEST_ERR_STREAM})
      string (COMPARE EQUAL "${TEST_ERRREF}" "${TEST_MATCH}" TEST_ERRREF_RESULT)
      if (NOT TEST_ERRREF_RESULT)
        # dump the output unless nodisplay option is set
        if (NOT TEST_NO_DISPLAY)
          execute_process (
              COMMAND ${CMAKE_COMMAND} -E echo ${TEST_ERR_STREAM}
              RESULT_VARIABLE TEST_ERRREF_RESULT
          )
        endif ()
        message (FATAL_ERROR "Failed: The error output of ${TEST_PROGRAM} did not contain '${TEST_ERRREF}'. Error output was: '${TEST_ERR_STREAM}'")
      endif ()
    endif ()
  endif ()

  # compare output files to references unless this must be skipped
  set (TEST_COMPARE_RESULT 0) # grep result variable; 0 is success
  if (NOT TEST_SKIP_COMPARE)
    if (EXISTS "${TEST_FOLDER}/${TEST_REFERENCE}")
      file (READ ${TEST_FOLDER}/${TEST_REFERENCE} TEST_STREAM)
      list (LENGTH TEST_STREAM test_len)
      if (test_len GREATER 0)
        if (WIN32)
          configure_file(${TEST_FOLDER}/${TEST_REFERENCE} ${TEST_FOLDER}/${TEST_REFERENCE}.tmp NEWLINE_STYLE CRLF)
          if (EXISTS "${TEST_FOLDER}/${TEST_REFERENCE}.tmp")
            file(RENAME ${TEST_FOLDER}/${TEST_REFERENCE}.tmp ${TEST_FOLDER}/${TEST_REFERENCE})
          endif ()
          #file (READ ${TEST_FOLDER}/${TEST_REFERENCE} TEST_STREAM)
          #file (WRITE ${TEST_FOLDER}/${TEST_REFERENCE} "${TEST_STREAM}")
        endif ()
        if (NOT TEST_SORT_COMPARE)
          # now compare the output with the reference
          execute_process (
              COMMAND ${CMAKE_COMMAND} -E compare_files --ignore-eol ${TEST_FOLDER}/${TEST_OUTPUT} ${TEST_FOLDER}/${TEST_REFERENCE}
              RESULT_VARIABLE TEST_COMPARE_RESULT
          )
        else ()
          file (STRINGS ${TEST_FOLDER}/${TEST_OUTPUT} v1)
          file (STRINGS ${TEST_FOLDER}/${TEST_REFERENCE} v2)
          list (SORT v1)
          list (SORT v2)
          if (NOT v1 STREQUAL v2)
            set (TEST_COMPARE_RESULT 1)
          endif ()
        endif ()

        # only compare files if previous operations were successful
        if (TEST_COMPARE_RESULT)
          set (TEST_COMPARE_RESULT 0)
          file (STRINGS ${TEST_FOLDER}/${TEST_OUTPUT} test_act)
          list (LENGTH test_act len_act)
          file (STRINGS ${TEST_FOLDER}/${TEST_REFERENCE} test_ref)
          list (LENGTH test_ref len_ref)
          if (NOT len_act EQUAL len_ref)
            set (TEST_COMPARE_RESULT 1)
          endif ()
          if (len_act GREATER 0 AND len_ref GREATER 0)
            if (TEST_SORT_COMPARE)
              list (SORT test_act)
              list (SORT test_ref)
            endif ()
            math (EXPR _FP_LEN "${len_ref} - 1")
            foreach (line RANGE 0 ${_FP_LEN})
              list (GET test_act ${line} str_act)
              list (GET test_ref ${line} str_ref)
              if (NOT str_act STREQUAL str_ref)
                if (str_act)
                  set (TEST_COMPARE_RESULT 1)
                  message (STATUS "line = ${line}\n***ACTUAL: ${str_act}\n****REFER: ${str_ref}\n")
                endif ()
              endif ()
            endforeach ()
          else ()
            if (len_act EQUAL 0)
              message (STATUS "COMPARE Failed: ${TEST_FOLDER}/${TEST_OUTPUT} is empty")
            endif ()
            if (len_ref EQUAL 0)
              message (STATUS "COMPARE Failed: ${TEST_FOLDER}/${TEST_REFERENCE} is empty")
            endif ()
          endif ()
          if (NOT len_act EQUAL len_ref)
            set (TEST_COMPARE_RESULT 1)
          endif ()
        endif ()
      endif ()

      message (STATUS "COMPARE Result: ${TEST_COMPARE_RESULT}")

      # again, if return value is !=0 scream and shout
      if (TEST_COMPARE_RESULT)
        message (FATAL_ERROR "Failed: The output of ${TEST_OUTPUT} did not match ${TEST_REFERENCE}")
      endif ()
    else ()
      message (TRACE "Test output file ${TEST_FOLDER}/${TEST_OUTPUT} does not exist")
    endif ()
  endif () # end of TEST_SKIP_COMPARE
else () # TEST_ERRREF is not defined
  # TEST_REFERENCE should always be matched unless TEST_GREP_COMPARE is set to 0
  set (TEST_GREP_RESULT 0) # grep result variable; 0 is success
  if (TEST_GREP_COMPARE AND EXISTS "${TEST_PROCESSED_OUTPUT}")
    file (READ ${TEST_PROCESSED_OUTPUT} TEST_STREAM)
    list (LENGTH TEST_STREAM test_len)
    if (test_len GREATER 0)
      string (REGEX MATCH "${TEST_REFERENCE}" TEST_MATCH ${TEST_STREAM})
      string (COMPARE EQUAL "${TEST_REFERENCE}" "${TEST_MATCH}" TEST_GREP_RESULT)
      if (NOT TEST_GREP_RESULT)
        message (FATAL_ERROR "Failed: The output of ${TEST_PROGRAM} did not contain ${TEST_REFERENCE}")
      endif ()
    endif ()
  endif ()
endif ()

# Check that TEST_FILTER text is not in the output when TEST_EXPECT is set to 1
if (TEST_FILTER)
  if (EXISTS "${TEST_PROCESSED_OUTPUT}")
    file (READ ${TEST_PROCESSED_OUTPUT} TEST_STREAM)
    string (REGEX MATCH "${TEST_FILTER}" TEST_MATCH ${TEST_STREAM})
    # TEST_EXPECT (1) interprets TEST_FILTER as; NOT to match
    if (TEST_EXPECT)
      string (LENGTH "${TEST_MATCH}" TEST_GREP_RESULT)
      if (TEST_GREP_RESULT)
        message (FATAL_ERROR "Failed: The output of ${TEST_PROGRAM} did contain ${TEST_FILTER}")
      endif ()
    endif ()
  endif ()
endif ()

# Check if the output files should not be removed
if (NOT DEFINED ENV{HDF4_NOCLEANUP})
  if (EXISTS "${TEST_FOLDER}/${TEST_OUTPUT}")
    file (REMOVE ${TEST_FOLDER}/${TEST_OUTPUT})
  endif ()

  if (EXISTS "${TEST_FOLDER}/${TEST_OUTPUT}.err")
    file (REMOVE ${TEST_FOLDER}/${TEST_OUTPUT}.err)
  endif ()

  if (TEST_DELETE_LIST)
    foreach (dfile in ${TEST_DELETE_LIST})
      file (REMOVE ${dfile})
    endforeach ()
  endif ()
endif ()

# everything went fine...
message (STATUS "Passed: The output of ${TEST_PROGRAM} matched")