#!/bin/bash
#
# Performs verification before code is pushed to git remote repository
#
# To skip the verification, run git push with the --no-verify argument
#       i.e. - $ 'git push --no-verify'
#
# Verification is performed in separate directory, thus not affecting current project dir
#

echoerr() { echo "$@" 1>&2; }

set -e # fail in case of any error

CURRENT_REPO_DIR=`pwd`
OUTPUT_REPO_DIR="$CURRENT_REPO_DIR/.verification"
CURRENT_BRANCH=`git rev-parse --abbrev-ref HEAD`

git fetch
LOCAL_COMMIT=$(git rev-parse @)
REMOTE_COMMIT=$(git rev-parse @{u})
BASE_COMMIT=$(git merge-base @ @{u})

if [ $REMOTE_COMMIT != $BASE_COMMIT ]
then
    echoerr "Branch not up-to-date. Please invoke: git pull"
    exit 1
fi

if [ $LOCAL_COMMIT = $REMOTE_COMMIT ]
then
    echoerr "Nothing to push. Accepting such push"
    exit 0
fi

unset GIT_WORK_TREE

if [ ! -d "$OUTPUT_REPO_DIR" ]; then
    echo "Cloning current repo $CURRENT_REPO_DIR to $OUTPUT_REPO_DIR"
    git clone $CURRENT_REPO_DIR $OUTPUT_REPO_DIR
fi

pushd $OUTPUT_REPO_DIR
git reset --hard HEAD # reset any changes
git fetch
git checkout $CURRENT_BRANCH
git reset --hard origin/$CURRENT_BRANCH

# run the tests with the gradle wrapper
./gradlew clean check

# store the last exit code in a variable
RESULT=$?

popd

# return result as exit code
exit $RESULT