#!/bin/bash

# Note: This script is intended to be run from the root of the repository.
#
# Not really a hook but should be used to check the completness of documentation for added code, otherwise CI will come for you.
# It's good to have /tmp as the output so that consecutive runs are fast but no clutter in the repository.

echo "+ Checking documentation..."

ROOT=$(pwd)
DOXYGEN=$(command -v doxygen)
TMPDIR=${ROOT}/.cache/doxygen
TMPFILE=${TMPDIR}/docs.log
DOCDIR=${TMPDIR}/out

# Check doxygen is at all installed
if [ -z "$DOXYGEN" ]; then
    # No hard error if doxygen is not installed yet
    cat <<EOF

                                   WARNING
-----------------------------------------------------------------------------
        'doxygen' is required to check documentation.
        Please install it for next time.

        Your changes may fail to pass CI once pushed.
-----------------------------------------------------------------------------

EOF
    exit 0
fi

# Check version of doxygen is at least 1.12
version=$($DOXYGEN --version | grep -o '[0-9\.]*')

if [[ "1.12.0" > "$version" ]]; then
    # No hard error if doxygen version is not the one we want - let CI deal with it
    cat <<EOF

                                    ERROR
-----------------------------------------------------------------------------
        A minimum of version 1.12 of `which doxygen` is required.
        Your version is $version. Please upgrade it for next time.

        Your changes may fail to pass CI once pushed.
-----------------------------------------------------------------------------

EOF
    exit 0
fi

mkdir -p ${DOCDIR} > /dev/null 2>&1
pushd ${DOCDIR} > /dev/null 2>&1

cat ${ROOT}/docs/Doxyfile | \
sed \
    -e "s/\${LINT}/YES/" \
    -e "s!\${SOURCE}!${ROOT}!" \
    -e "s/\${USE_DOT}/NO/" \
    -e "s/\${EXCLUDES}/impl/" \
| ${DOXYGEN} - 2> ${TMPFILE} 1> /dev/null

# We don't want to check for default values and typedefs as well as for member variables
OUT=$(cat ${TMPFILE} \
    | grep -v "=default" \
    | grep -v "\(variable\)" \
    | grep -v "\(typedef\)")

rm -rf ${TMPFILE} > /dev/null 2>&1
popd > /dev/null 2>&1

if [[ ! -z "$OUT" ]]; then
    cat <<EOF

                                    ERROR
-----------------------------------------------------------------------------
                      Found issues with documentation:

$OUT
-----------------------------------------------------------------------------

EOF
    exit 2
fi