#!/bin/bash

echo "$(date --utc +%FT%TZ): Fetching remote repository..."
git fetch

UPSTREAM=${1:-'@{u}'}
LOCAL=$(git rev-parse @)
REMOTE=$(git rev-parse "$UPSTREAM")
BASE=$(git merge-base @ "$UPSTREAM")

if [ $LOCAL = $REMOTE]; then
	echo "$(date --utc +%FT%TZ): No change detected in git"
elif [ $LOCAL = $BASE ]; then
	BUILD_VERSION=$(git rev-parse HEAD)
	echo "$(date --utc +%FT%TZ): Changes detected, deploying new version: $BUILD_VERSION"
	./scripts/deploy.sh
elif [$REMOTE = $BASE]; then
	echo "$(date --utc +%FT%TZ): Local changes detected, stashing"
	git stash
	./scripts/deploy.sh
else
	echo "$(date --utc +%FT%TZ): Git is diverged, this is unexpected."
fi