#!/bin/sh

# taken from
# https://github.com/ryanbrainard/heroku-buildpack-testrunner/blob/master/lib/test_utils.sh

oneTimeSetUp()
{
   TEST_SUITE_CACHE="$(mktemp -d ${SHUNIT_TMPDIR}/test_suite_cache.XXXX)"
}

oneTimeTearDown()
{
  rm -rf ${TEST_SUITE_CACHE}
}

setUp()
{
  OUTPUT_DIR="$(mktemp -d ${SHUNIT_TMPDIR}/output.XXXX)"
  STD_OUT="${OUTPUT_DIR}/stdout"
  STD_ERR="${OUTPUT_DIR}/stderr"
  BUILD_DIR="${OUTPUT_DIR}/build"
  CACHE_DIR="${OUTPUT_DIR}/cache"
  mkdir -p ${OUTPUT_DIR}
  mkdir -p ${BUILD_DIR}
  mkdir -p ${CACHE_DIR}
}

tearDown()
{
  rm -rf ${OUTPUT_DIR}
}

capture()
{
  resetCapture

  LAST_COMMAND="$@"

  $@ >${STD_OUT} 2>${STD_ERR}
  RETURN=$?
  rtrn=${RETURN} # deprecated
}

resetCapture()
{
  if [ -f ${STD_OUT} ]; then
    rm ${STD_OUT}
  fi

  if [ -f ${STD_ERR} ]; then
    rm ${STD_ERR}
  fi

  unset LAST_COMMAND
  unset RETURN
  unset rtrn # deprecated
}

detect()
{
  capture ${BUILDPACK_HOME}/bin/detect ${BUILD_DIR}
}

compile()
{
  capture ${BUILDPACK_HOME}/bin/compile ${BUILD_DIR} ${CACHE_DIR}
}

release()
{
  capture ${BUILDPACK_HOME}/bin/release ${BUILD_DIR}
}

assertCapturedEquals()
{
  assertEquals "$@" "$(cat ${STD_OUT})"
}

assertCapturedNotEquals()
{
  assertNotEquals "$@" "$(cat ${STD_OUT})"
}

assertCaptured()
{
  assertFileContains "$@" "${STD_OUT}"
}

assertNotCaptured()
{
  assertFileNotContains "$@" "${STD_OUT}"
}

assertCapturedSuccess()
{
  assertEquals "Captured exit code -" "0" "${RETURN}"
  assertEquals "STD_ERR -" "" "$(cat ${STD_ERR})"

  if [ $RETURN -ne 0 -a -z "$(cat ${STD_ERR})" ]; then
    # Failing exit code but stderr was empty. Display stdout to help debugging.
    cat $STD_OUT
    echo
  fi
}

# assertCapturedError [[expectedErrorCode] expectedErrorMsg]
assertCapturedError()
{
  if [ $# -gt 1 ]; then
    local expectedErrorCode=${1}
    shift
  fi

  local expectedErrorMsg=${1:-""}

  if [ -z ${expectedErrorCode} ]; then
    assertTrue "Expected captured exit code to be greater than 0; was <${RETURN}>" "[ ${RETURN} -gt 0 ]"
  else
    assertTrue "Expected captured exit code to be <${expectedErrorCode}>; was <${RETURN}>" "[ ${RETURN} -eq ${expectedErrorCode} ]"
  fi

  if [ "${expectedErrorMsg}" != "" ]; then
    assertFileContains "Expected STD_ERR to contain error <${expectedErrorMsg}>" "${expectedErrorMsg}" "${STD_ERR}"
  fi
}

_assertContains()
{
  if [ 5 -eq $# ]; then
    local msg=$1
    shift
  elif [ ! 4 -eq $# ]; then
    fail "Expected 4 or 5 parameters; Receieved $# parameters"
  fi

  local needle=$1
  local haystack=$2
  local expectation=$3
  local haystack_type=$4

  case "${haystack_type}" in
    "file") grep -q -F -e "${needle}" ${haystack} ;;
    "text") echo "${haystack}" | grep -q -F -e "${needle}" ;;
  esac

  if [ "${expectation}" != "$?" ]; then
    case "${expectation}" in
      0) default_msg="Expected <${haystack}> to contain <${needle}>" ;;
      1) default_msg="Did not expect <${haystack}> to contain <${needle}>" ;;
    esac

    fail "${msg:-${default_msg}}"
  fi
}

debug()
{
  cat $STD_OUT
  echo '^^^^^^'
  cat $STD_ERR
}

assertContains()
{
  _assertContains "$@" 0 "text"
}

assertNotContains()
{
  _assertContains "$@" 1 "text"
}

assertFileContains()
{
  _assertContains "$@" 0 "file"
}

assertFileNotContains()
{
  _assertContains "$@" 1 "file"
}

command_exists () {
    type "$1" > /dev/null 2>&1 ;
}

assertFileMD5()
{
  expectedHash=$1
  filename=$2

  if command_exists "md5sum"; then
    md5_cmd="md5sum ${filename}"
    expected_md5_cmd_output="${expectedHash}  ${filename}"
  elif command_exists "md5"; then
    md5_cmd="md5 ${filename}"
    expected_md5_cmd_output="MD5 (${filename}) = ${expectedHash}"
  else
    fail "no suitable MD5 hashing command found on this system"
  fi

  assertEquals "${expected_md5_cmd_output}" "`${md5_cmd}`"
}