#!/bin/bash

# Copyright (c) 2022 by Apex.AI Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0

# This script checks code files with clang-tidy
# Example usage: ./tools/scripts/clang_tidy_check.sh full|hook|ci_pull_request

set -e

MODE=${1:-full} # Can be either `full` for all files or `hook` for formatting with git hooks

FILE_FILTER="\.(h|hpp|inl|c|cpp)$"
FILE_BLACKLIST='(test|testing|tools|iceoryx_dds|iceoryx_binding_c|doc|iceoryx_integrationtest|iceoryx_meta|iceoryx_examples|platform)'

fail() {
    printf "\033[1;31merror: %s: %s\033[0m\n" ${FUNCNAME[1]} "${1:-"Unknown error"}"
    exit 1
}

CLANG_TIDY_VERSION=12
CLANG_TIDY_CMD="clang-tidy-$CLANG_TIDY_VERSION"
if ! command -v $CLANG_TIDY_CMD &> /dev/null
then
    CLANG_TIDY_MAJOR_VERSION=$(clang-tidy --version | sed -rn 's/.*([0-9][0-9])\.[0-9].*/\1/p')
    if [[ $CLANG_TIDY_MAJOR_VERSION -lt "$CLANG_TIDY_VERSION" ]]; then
        echo "Warning: clang-tidy version $CLANG_TIDY_VERSION or higher is not installed."
        echo "Code will not be linted."
        exit 0
    else
        CLANG_TIDY_CMD="clang-tidy"
    fi
fi


WORKSPACE=$(git rev-parse --show-toplevel)
cd "${WORKSPACE}"

if ! [[ -f build/compile_commands.json ]]; then
    export CXX=clang++
    export CC=clang
    cmake -Bbuild -Hiceoryx_meta -DBUILD_TEST=ON -DBUILD_EXAMPLES=ON
fi

if [[ "$MODE" == "hook"* ]]; then
    FILES=$(git diff --cached --name-only --diff-filter=CMRT | grep -E "$FILE_FILTER" | grep -Ev "$FILE_BLACKLIST" | cat)
    # List only added files
    ADDED_FILES=$(git diff --cached --name-only --diff-filter=A | grep -E "$FILE_FILTER" | grep -Ev "$FILE_BLACKLIST" | cat)
    echo "Checking files with Clang-Tidy"
    echo " "
        if [ -z "$FILES" ]; then
              echo "No modified files to check, skipping clang-tidy"
        else
            $CLANG_TIDY_CMD -p build $FILES
        fi

        if [ -z "$ADDED_FILES" ]; then
            echo "No added files to check, skipping clang-tidy"
        else
            $CLANG_TIDY_CMD --warnings-as-errors=* -p build $ADDED_FILES
        fi
    exit
elif [[ "$MODE" == "full"* ]]; then
    FILES=$(git ls-files | grep -E "$FILE_FILTER" | grep -Ev "$FILE_BLACKLIST")
    echo "Checking all files with Clang-Tidy"
    echo " "
    echo $FILES
    run-$CLANG_TIDY_CMD -p build $FILES
    exit $?
elif [[ "$MODE" == "ci_pull_request"* ]]; then
    FILES=$(echo $2 | grep -E "$FILE_FILTER" | grep -Ev "$FILE_BLACKLIST" | cat)
    echo " "
    echo $FILES
    if [ -z "$FILES" ]; then
          echo "No modified files to check, skipping clang-tidy"
    else
        $CLANG_TIDY_CMD -p build $FILES
    fi
fi