#!/usr/bin/env bash
# 2020/03/30 jtudelag
# 2020/08 mth revised script
#
# Use podman instead of the ruby script to coalesce asciidoc, avoid installing deps in the host.

# From README
# ./scripts/coalesce-asciidoc README.adoc --output README-coalesced.adoc

CUR_WORK_PTH="${BASH_SOURCE[0]}"
CUR_WORK_DIR="${CUR_WORK_PTH%/*}"
CUR_WORK_SCT="${CUR_WORK_PTH##*/}"

# load variable file
SC=.cer-config
if [ -f $SC ] ; then
  source $SC
else
  echo "Missing $SC file" ; exit 1
fi

MYREPORT=README.adoc
REPORTNAME=${MYREPORT}

RUN_CODE=250

function USAGE() {
  USAGE_ARR=(
    "# Usage for ${CUR_WORK_SCT}"
    ""
    "   ${CUR_WORK_SCT} [options] [arguments]"
    ""
    "   OPTIONAL ARGUMENTS:"
    ""
    "     -l    Provide -l <LANGUAGE> for the language of the generated document"
    "              (legacy option) --lang=<LANGUAGE>, <LANGUAGE>"
    "              languages available are inside locale dir"
    ""
    "     -f    Provide -f <REPORTNAME> for the desired input name of the report if"
    "              differing from README.adoc"
    "              (legacy option) --name=<NAME>, <NAME>"
    ""
    "     -o|--output   Provide -o <OUTPUT> to the desired output PDF document name"
    "              NOTE: this script automaticaly prepends \"cer-\" and appends"
    "              \".pdf\""
    ""
    "     -a|--adoc    Try to generate using the local asciidoctor-pdf software"
    ""
    "     -p|--podman  Try to generate using podman"
    ""
    "     -d|--docker  Try to generate using Docker"
    ""
    "      The script asciidoc-coalescer.rb is required to coalesce asciidocs. "
    "      Please follow the instructions found in the toplevel README.md to ensure "
    "      your environment provides this. "
    ""
    "     -h,--help"
    "           Prints this help usage message."
    ""
  )
}



# generic error function
function err() {
  printf "%s\n" "${USAGE_ARR[@]}" "$*"
  exit 1
}


## start script ##
USAGE

while [ -n "$1" ] ; do
  case "$1" in
    -f          ) REPORTNAME=$2 ; shift ;;
    -o|--output ) OUTPUT=$2 ; shift ;;
    -a|--adoc   ) GENERATE=A; shift ;;
    -p|--podman ) GENERATE=P; shift ;;
    -d|--docker ) GENERATE=D; shift ;;
    -h|--help   ) printf "%s\n" "${USAGE_ARR[@]}"
                  exit 0
                ;;
    *           ) if [[ $1 =~ .*\.adoc$ ]] ; then
                    REPORTNAME=$1
                  else
                    err "Unknown option $1"
                  fi
                ;;
  esac
  shift
done

if [ ! $OUTPUT ] ; then
  BOUTPUT=$(basename ${REPORTNAME} .adoc)
  OUTPUT=${BOUTPUT}-coalesced.adoc
fi

function runpodman() {
  if command -v podman > /dev/null ; then
    podman run --rm --name coalesce-asciidoc \
    -w /cer/ \
    -v "$(pwd)":/cer:z \
    --entrypoint ./scripts/asciidoc-coalescer.rb ${IMAGE} ${REPORTNAME} --output ${OUTPUT}
    GENERATE_PDF_EXIT_CODE=$?
    RUN_CODE=0
  else
    COALESCE_PDF_EXIT_CODE=2
  fi
}

function rundocker() {
  if command -v docker > /dev/null ; then
    docker run --rm --name coalesce-asciidoc \
           -w /cer/
           -v "$(pwd)":/cer:z \
           --entrypoint ./scripts/asciidoc-coalescer.rb ${IMAGE} ${REPORTNAME} --output ${OUTPUT}
    GENERATE_PDF_EXIT_CODE=$?
    RUN_CODE=0
  else
    COALESCE_PDF_EXIT_CODE=3
  fi
}

# function to run with local asciidoctor-pdf installation
function runadocpdf() {
  if command -v  asciidoctor-pdf > /dev/null ; then
    echo "coalesce asciidoc using local command"
    ./scripts/asciidoc-coalescer.rb  ${REPORTNAME} --output ${OUTPUT}
  GENERATE_PDF_EXIT_CODE=$?
  else
    exit 1
  fi
}

# run the correct thing once.
if [ "${GENERATE}" = "P" ] ; then
 runpodman
elif [ "${GENERATE}" = "D" ] ; then
 rundocker
elif [ "$GENERATE" = "A" ] ; then
 runadocpdf
else
 runpodman
 [ "${RUN_CODE}" -eq "250" ] && rundocker
 [ "${RUN_CODE}" -eq "250" ] && runadocpdf
fi


case "${GENERATE_PDF_EXIT_CODE}" in
    0) echo "Generated: ${OUTPUT}" ;;
    1) echo "ERROR: Something went wrong coalescing." ;;
    2) echo "ERROR: Podman not found, please use other option." ;;
    3) echo "ERROR: Docker not found, please use other option." ;;
    4) printf "ERROR: aasciidoc-coalescer.rb not found." ;;
    125) echo "ERROR: Attempted to use docker but Docker daemon wasn't running" ;;
    *) echo "ERROR: Something currenlty unknown went wrong" ;;
esac

exit $GENERATE_PDF_EXIT_CODE