#!/bin/bash
#
# The script is used for determining options and running a static code
# analysis scan via SonarCloud.
#
# Author: Alex Tereschenko <alext.mkrs@gmail.com>
#
# All environment variables used are passed from either Travis or docker-compose.
# See details at https://docs.sonarqube.org/display/SONAR/Analysis+Parameters.
#
# Travis ones are:
#   Created by us:
#   - SONAR_ORG - SonarCloud "organization", under which the project is located.
#   - SONAR_PROJ_KEY - SonarCloud project key (name) to report to.
#   - SONAR_TOKEN - access token for that project (must be protected in Travis).
#   - GITHUB_TOKEN - GH OAuth token used by SonarCloud's GH plugin to report status in PRs.
#     See details at https://docs.sonarqube.org/display/PLUG/GitHub+Plugin. Must be protected.
#   Default:
#   - All TRAVIS_* variables. They are described in Travis docs
#     at https://docs.travis-ci.com/user/environment-variables
#
# docker-compose ones are:
#  - UPM_SRC_DIR - path to upm's git clone in the Docker container.

# Check required environment variables and exit if they are not set
UPM_SRC_DIR=${UPM_SRC_DIR:?value not provided}
SONAR_PROJ_KEY=${SONAR_PROJ_KEY:?value not provided}
SONAR_ORG=${SONAR_ORG:?value not provided}
SONAR_TOKEN=${SONAR_TOKEN:?value not provided}

bw_output_path="${UPM_SRC_DIR}/build/bw-output"

sonar_cmd_base="build-wrapper-linux-x86-64 --out-dir ${bw_output_path} make -j8 clean all && \
    sonar-scanner \
        --debug \
        -Dsonar.projectKey=${SONAR_PROJ_KEY} \
        -Dsonar.projectBaseDir=${UPM_SRC_DIR} \
        -Dsonar.sources=${UPM_SRC_DIR} \
        -Dsonar.inclusions='CMakeLists.txt,examples/**/*,include/**/*,src/**/*,tests/**/*' \
        -Dsonar.java.binaries='src' \
        -Dsonar.coverage.exclusions='**/*' \
        -Dsonar.cfamily.build-wrapper-output=${bw_output_path} \
        -Dsonar.host.url=https://sonarqube.com \
        -Dsonar.organization=${SONAR_ORG} \
        -Dsonar.login=${SONAR_TOKEN} \
"

# Some useful data for logs
echo "TRAVIS_BRANCH: ${TRAVIS_BRANCH}"
echo "TRAVIS_PULL_REQUEST: ${TRAVIS_PULL_REQUEST}"
echo "TRAVIS_PULL_REQUEST_SLUG: ${TRAVIS_PULL_REQUEST_SLUG}"
echo "TRAVIS_REPO_SLUG: ${TRAVIS_REPO_SLUG}"

if [ "${TRAVIS_BRANCH}" == "master" -a "${TRAVIS_PULL_REQUEST}" == "false" ]; then
    # Master branch push - do a full-blown scan
    echo "Performing master branch push scan"
    sonar_cmd="${sonar_cmd_base}"
elif [ "${TRAVIS_PULL_REQUEST}" != "false" -a "${TRAVIS_PULL_REQUEST_SLUG}" == "${TRAVIS_REPO_SLUG}" ]; then
    # Internal PR - do a preview scan with report to the PR
    ${GITHUB_TOKEN:?value not provided}

    echo "Performing internal pull request scan"
    sonar_cmd="${sonar_cmd_base} \
               -Dsonar.analysis.mode=preview \
               -Dsonar.github.pullRequest=${TRAVIS_PULL_REQUEST} \
               -Dsonar.github.repository=${TRAVIS_REPO_SLUG} \
               -Dsonar.github.oauth=${GITHUB_TOKEN} \
    "
else
    echo "Skipping the scan - external pull request or non-master branch push"
    exit 0
fi

echo "About to run the scan, the command is:"
echo "${sonar_cmd}"

eval "${sonar_cmd}"