#!/bin/bash
# SPDX-License-Identifier: LicenseRef-CSSL-1.0

function usage {
    echo "OAI Coding / Formatting Guideline Check script"
    echo ""
    echo "   By default (no options) the complete repository will be checked"
    echo "   In case of merge request, provided source and target branch,"
    echo "   the script will check only the modified files"
    echo ""
    echo "Usage:"
    echo "------"
    echo "    checkCodingFormattingRules.sh [OPTIONS]"
    echo ""
    echo "Options:"
    echo "--------"
    echo "    --src-branch #### OR -sb ####"
    echo "    Specify the source branch of the merge request."
    echo ""
    echo "    --target-branch #### OR -tb ####"
    echo "    Specify the target branch of the merge request (usually develop)."
    echo ""
    echo "    --help OR -h"
    echo "    Print this help message."
    echo ""
}

if [ $# -ne 4 ] && [ $# -ne 1 ] && [ $# -ne 0 ]
then
    echo "Syntax Error: not the correct number of arguments"
    echo ""
    usage
    exit 1
fi

if [ $# -eq 0 ]
then
    # in this file we previously had a list of files that were not properly
    # formatted. At the time of this MR, the Jenkinsfile expects this file, so
    # we simply produce an empty one
    touch ./oai_rules_result.txt

    # Testing Circular Dependencies protection
    awk '/#[ \t]*ifndef/ { gsub("^.*ifndef *",""); if (names[$1]!="") print "files with same {define ", FILENAME, names[$1]; names[$1]=FILENAME } /#[ \t]*define/ { gsub("^.*define *",""); if(names[$1]!=FILENAME) print "error in declaration", FILENAME, $1, names[$1]; nextfile }' `find openair* common targets executables -name *.h |grep -v LFDS` > header-files-w-incorrect-define.txt

    # Testing if explicit GNU GPL license banner
    grep -E -irl --exclude-dir=.git --include=*.cpp --include=*.c --include=*.h "General Public License" . | grep -E -v "openair3/NAS/COMMON/milenage.h" > files-w-gnu-gpl-license-banner.txt

    # Looking at exotic/suspect banner
    LIST_OF_FILES_W_BANNER=`grep -E -irl --exclude-dir=.git --include=*.cpp --include=*.c --include=*.h "Copyright|copyleft" .`
    if [ -f ./files-w-suspect-banner.txt ]; then rm -f ./files-w-suspect-banner.txt; fi
    for FILE in $LIST_OF_FILES_W_BANNER
    do
       IS_NFAPI=`echo $FILE | grep -E -c "nfapi/open-nFAPI|nfapi/oai_integration/vendor_ext" || true`
       IS_OAI_LICENCE_PRESENT=`grep -E -c "SPDX-License-Identifier: LicenseRef-CSSL-1.0" $FILE || true`
       IS_BSD_LICENCE_PRESENT=`grep -E -c "the terms of the BSD Licence|License-Identifier: BSD-2-Clause|License-Identifier: BSD-3-Clause" $FILE || true`
       IS_MIT_LICENCE_PRESENT=`grep -E -c "SPDX-License-Identifier: MIT" $FILE || true`
       IS_EXCEPTION=`echo $FILE | grep -E -c "common/utils/collection/tree.h|common/utils/collection/queue.h|openair2/UTIL/OPT/packet-rohc.h|openair3/NAS/COMMON/milenage.h|openair1/PHY/CODING/crc.h|openair1/PHY/CODING/crcext.h|openair1/PHY/CODING/types.h" || true`
       if [ $IS_OAI_LICENCE_PRESENT -eq 0 ] && [ $IS_BSD_LICENCE_PRESENT -eq 0 ] && [ $IS_MIT_LICENCE_PRESENT -eq 0 ]
       then
           if [ $IS_NFAPI -eq 0 ] && [ $IS_EXCEPTION -eq 0 ]
           then
               echo $FILE >> ./files-w-suspect-banner.txt
           fi
       fi
    done
    exit 0
fi

checker=0
while [[ $# -gt 0 ]]
do
key="$1"

case $key in
    -h|--help)
    shift
    usage
    exit 0
    ;;
    -sb|--src-branch)
    SOURCE_BRANCH="$2"
    let "checker|=0x1"
    shift
    shift
    ;;
    -tb|--target-branch)
    TARGET_BRANCH="$2"
    let "checker|=0x2"
    shift
    shift
    ;;
    *)
    echo "Syntax Error: unknown option: $key"
    echo ""
    usage
    exit 1
esac

done


if [ $checker -ne 3 ]
then
    echo "Source Branch is    : $SOURCE_BRANCH"
    echo "Target Branch is    : $TARGET_BRANCH"
    echo ""
    echo "Syntax Error: missing option"
    echo ""
    usage
    exit 1
fi

# Merge request scenario

MERGE_COMMMIT=`git log -n1 --pretty=format:%H`
TARGET_INIT_COMMIT=`git log -n1 --pretty=format:%H origin/$TARGET_BRANCH`

echo " ---- Checking the modified files by the merge request ----"
echo ""
echo "Source Branch is    : $SOURCE_BRANCH"
echo "Target Branch is    : $TARGET_BRANCH"
echo "Merged Commit is    : $MERGE_COMMMIT"
echo "Target Init   is    : $TARGET_INIT_COMMIT"
echo ""
echo " ----------------------------------------------------------"
echo ""

# Retrieve the list of modified files since the latest develop commit
MODIFIED_FILES=`git log $TARGET_INIT_COMMIT..$MERGE_COMMMIT --oneline --name-status | grep -E "^M|^A" | sed -e "s@^M\t*@@" -e "s@^A\t*@@" | sort | uniq`
NB_TO_FORMAT=0
if [ -f header-files-w-incorrect-define.txt ]
then
    rm -f header-files-w-incorrect-define.txt
fi
if [ -f files-w-gnu-gpl-license-banner.txt ]
then
    rm -f files-w-gnu-gpl-license-banner.txt
fi
if [ -f files-w-suspect-banner.txt ]
then
    rm -f files-w-suspect-banner.txt
fi
awk '/#[ \t]*ifndef/ { gsub("^.*ifndef *",""); if (names[$1]!="") print "files with same {define ", FILENAME, names[$1]; names[$1]=FILENAME } /#[ \t]*define/ { gsub("^.*define *",""); if(names[$1]!=FILENAME) print "error in declaration", FILENAME, $1, names[$1]; nextfile }' `find openair* common targets executables -name *.h |grep -v LFDS` > header-files-w-incorrect-define-tmp.txt

for FULLFILE in $MODIFIED_FILES
do
    # sometimes, we remove files
    if [ ! -f $FULLFILE ]; then continue; fi

    filename=$(basename -- "$FULLFILE")
    EXT="${filename##*.}"
    if [ $EXT = "c" ] || [ $EXT = "h" ] || [ $EXT = "cpp" ] || [ $EXT = "hpp" ]
    then
        # Testing if explicit GNU GPL license banner
        GNU_EXCEPTION=`echo $FULLFILE | grep -E -c "openair3/NAS/COMMON/milenage.h" || true`
        if [ $GNU_EXCEPTION -eq 0 ]
        then
            grep -E -il "General Public License" $FULLFILE >> files-w-gnu-gpl-license-banner.txt
        fi
        # Looking at exotic/suspect banner
        IS_BANNER=`grep -E -i -c "Copyright|copyleft" $FULLFILE || true`
        if [ $IS_BANNER -ne 0 ]
        then
            IS_NFAPI=`echo $FULLFILE | grep -E -c "nfapi/open-nFAPI|nfapi/oai_integration/vendor_ext" || true`
            IS_OAI_LICENCE_PRESENT=`grep -E -c "SPDX-License-Identifier: LicenseRef-CSSL-1.0" $FULLFILE || true`
            IS_BSD_LICENCE_PRESENT=`grep -E -c "the terms of the BSD Licence|License-Identifier: BSD-2-Clause|License-Identifier: BSD-3-Clause" $FULLFILE || true`
            IS_MIT_LICENCE_PRESENT=`grep -E -c "SPDX-License-Identifier: MIT" $FULLFILE || true`
            IS_EXCEPTION=`echo $FULLFILE | grep -E -c "common/utils/collection/tree.h|common/utils/collection/queue.h|openair2/UTIL/OPT/packet-rohc.h|openair3/NAS/COMMON/milenage.h|openair1/PHY/CODING/crc.h|openair1/PHY/CODING/crcext.h|openair1/PHY/CODING/types.h" || true`
            if [ $IS_OAI_LICENCE_PRESENT -eq 0 ] && [ $IS_BSD_LICENCE_PRESENT -eq 0 ] && [ $IS_MIT_LICENCE_PRESENT -eq 0 ]
            then
                if [ $IS_NFAPI -eq 0 ] && [ $IS_EXCEPTION -eq 0 ]
                then
                    echo $FULLFILE >> ./files-w-suspect-banner.txt
                fi
            fi
        fi
    fi
    # Testing Circular Dependencies protection
    if [ $EXT = "h" ] || [ $EXT = "hpp" ]
    then
        grep $FULLFILE header-files-w-incorrect-define-tmp.txt >> header-files-w-incorrect-define.txt
    fi
done
rm -f header-files-w-incorrect-define-tmp.txt

# in this script we previously produced a list of files that were not properly
# formatted. At the time of this MR, the Jenkinsfile expects this file, so
# we simply produce an empty file
touch ./oai_rules_result.txt

exit 0