#!/bin/bash

for bin in curl docker-compose docker git awk sha1sum; do
	if [[ -z $(which ${bin}) ]]; then echo "Cannot find ${bin}, exiting..."; exit 1; fi
done

CONFIG_ARRAY=("SKIP_LETS_ENCRYPT" "SKIP_CLAMD" "SKIP_IP_CHECK" "SKIP_FAIL2BAN" "ADDITIONAL_SAN" "DOVEADM_PORT")
echo >> mailcow.conf
for option in ${CONFIG_ARRAY[@]}; do
	if [[ ${option} == "ADDITIONAL_SAN" ]]; then
		if ! grep -q ${option} mailcow.conf; then
			echo "Adding new option \"${option}\" to mailcow.conf"
			echo "${option}=" >> mailcow.conf
		fi
	elif [[ ${option} == "COMPOSE_PROJECT_NAME" ]]; then
		if ! grep -q ${option} mailcow.conf; then
			echo "Adding new option \"${option}\" to mailcow.conf"
			echo "COMPOSE_PROJECT_NAME=mailcow-dockerized" >> mailcow.conf
		fi
	elif [[ ${option} == "DOVEADM_PORT" ]]; then
		if ! grep -q ${option} mailcow.conf; then
			echo "Adding new option \"${option}\" to mailcow.conf"
			echo "DOVEADM_PORT=127.0.0.1:19991" >> mailcow.conf
		fi
	elif ! grep -q ${option} mailcow.conf; then
		echo "Adding new option \"${option}\" to mailcow.conf"
		echo "${option}=n" >> mailcow.conf
	fi
done

echo -en "Checking internet connection... "
curl -o /dev/null google.com -sm3
if [[ $? != 0 ]]; then
	echo -e "\e[31mfailed\e[0m"
	exit 1
else
	echo -e "\e[32mOK\e[0m"
fi

set -o pipefail
export LC_ALL=C
DATE=$(date +%Y-%m-%d_%H_%M_%S)
BRANCH=$(git rev-parse --abbrev-ref HEAD)

case "${1}" in
	--check|-c)
		echo "Checking remote code for updates..."
		git fetch origin ${BRANCH}
		if ! git diff origin/${BRANCH} --quiet; then
			echo "Updated code is available."
			exit 0
		else
			echo "No updates available."
			exit 3
		fi
	;;
esac

echo -e "\e[32mChecking for newer update script...\e[0m"
SHA1_1=$(sha1sum update.sh)
git fetch origin ${BRANCH}
git checkout origin/${BRANCH} update.sh
SHA1_2=$(sha1sum update.sh)
if [[ ${SHA1_1} != ${SHA1_2} ]]; then
	echo "update.sh changed, please run this script again, exiting."
	chmod +x update.sh
	exit 0
fi

if [[ -f mailcow.conf ]]; then
	source mailcow.conf
else
	echo -e "\e[31mNo mailcow.conf - is mailcow installed?\e[0m"
	exit 1
fi

read -r -p "Are you sure you want to update mailcow: dockerized? All containers will be stoped. [y/N] " response
if [[ ! "$response" =~ ^([yY][eE][sS]|[yY])+$ ]]; then
	echo "OK, exiting."
	exit 0
fi

echo -e "Stopping mailcow... "
sleep 2
docker-compose down

# Silently fixing remote url from andryyy to mailcow
git remote set-url origin https://github.com/mailcow/mailcow-dockerized
echo -e "\e[32mCommitting current status...\e[0m"
git add -u
git commit -am "Before update on ${DATE}" > /dev/null
echo -e "\e[32mFetching updated code from remote...\e[0m"
git fetch origin ${BRANCH}
echo -e "\e[32mMerging local with remote code (recursive, options: \"theirs\", \"patience\"...\e[0m"
git config merge.defaultToUpstream true
git merge -Xtheirs -Xpatience -m "After update on ${DATE}"
# Need to use a variable to not pass return codes of if checks
MERGE_RETURN=$?
if [[ ${MERGE_RETURN} == 128 ]]; then
	echo -e "\e[31m\nOh no, what happened?\n=> You most likely added files to your local mailcow instance that were now added to the official mailcow repository. Please move them to another location before updating mailcow.\e[0m"
	exit 1
elif [[ ${MERGE_RETURN} == 1 ]]; then
	echo -e "\e[93mPotenial conflict, trying to fix...\e[0m"
	git status --porcelain | grep -E "UD|DU" | awk '{print $2}' | xargs rm -v
	git add -A
	git commit -m "After update on ${DATE}" > /dev/null
	git checkout .
	echo -e "\e[32mRemoved and recreated files if necessary.\e[0m"
elif [[ ${MERGE_RETURN} != 0 ]]; then
	echo -e "\e[31m\nOh no, something went wrong. Please check the error message above.\e[0m"
	echo
	echo "Run docker-compose up -d to restart your stack without updates or try again after fixing the mentioned errors."
	exit 1
fi


echo -e "\e[32mFetching new docker-compose version...\e[0m"
sleep 2
if [[ $(curl -sL -w "%{http_code}" https://www.servercow.de/docker-compose/latest.php -o /dev/null) == "200" ]]; then
	LATEST_COMPOSE=$(curl -#L https://www.servercow.de/docker-compose/latest.php)
	curl -#L https://github.com/docker/compose/releases/download/${LATEST_COMPOSE}/docker-compose-$(uname -s)-$(uname -m) > $(which docker-compose)
	chmod +x $(which docker-compose)
else
	echo -e "\e[33mCannot determine latest docker-compose version, skipping...\e[0m"
fi

echo -e "\e[32mFetching new images, if any...\e[0m"
sleep 2
docker-compose pull --parallel

# Fix missing SSL, does not overwrite existing files
[[ ! -d data/assets/ssl ]] && mkdir -p data/assets/ssl
cp -n data/assets/ssl-example/*.pem data/assets/ssl/

echo -e "\e[32mStarting mailcow...\e[0m"
sleep 2
docker-compose up -d --remove-orphans

echo -e "\e[32mCollecting garbage...\e[0m"
IMGS_TO_DELETE=()
for container in $(grep -oP "image: \Kmailcow.+" docker-compose.yml); do
	REPOSITORY=${container/:*}
	TAG=${container/*:}
	V_MAIN=${container/*.}
	V_SUB=${container/*.}

	EXISTING_TAGS=$(docker images | grep ${REPOSITORY} | awk '{ print $2 }')
	for existing_tag in ${EXISTING_TAGS[@]}; do
		V_MAIN_EXISTING=${existing_tag/*.}
		V_SUB_EXISTING=${existing_tag/*.}

		# Not an integer
		[[ ! $V_MAIN_EXISTING =~ ^[0-9]+$ ]] && continue
		[[ ! $V_SUB_EXISTING =~ ^[0-9]+$ ]] && continue

		if [[ $V_MAIN_EXISTING == "latest" ]]; then
			echo "Found deprecated label \"latest\" for repository $REPOSITORY, it should be deleted."
			IMGS_TO_DELETE+=($REPOSITORY:$existing_tag)
		elif [[ $V_MAIN_EXISTING -lt $V_MAIN ]]; then
			echo "Found tag $existing_tag for $REPOSITORY, which is older than the current tag $TAG and should be deleted."
			IMGS_TO_DELETE+=($REPOSITORY:$existing_tag)
		elif [[ $V_SUB_EXISTING -lt $V_SUB ]]; then
			echo "Found tag $existing_tag for $REPOSITORY, which is older than the current tag $TAG and should be deleted."
			IMGS_TO_DELETE+=($REPOSITORY:$existing_tag)
		fi
	done
done
if [[ ! -z ${IMGS_TO_DELETE[*]} ]]; then
	echo "Run the following command to delete unused image tags:"
	echo
	echo "    docker rmi ${IMGS_TO_DELETE[*]}"
	echo
	read -r -p "Do you want to delete old image tags right now? [y/N] " response
	if [[ "$response" =~ ^([yY][eE][sS]|[yY])+$ ]]; then
		docker rmi ${IMGS_TO_DELETE[*]}
	else
		echo "OK, skipped."
	fi
fi
echo -e "\e[32mFurther cleanup...\e[0m"
echo "If you want to cleanup further garbage collected by Docker, please make sure all containers are up and running before cleaning your system by executing \"docker system prune\""

#echo "In case you encounter any problem, hard-reset to a state before updating mailcow:"
#echo
#git reflog --color=always | grep "Before update on "
#echo
#echo "Use \"git reset --hard hash-on-the-left\" and run docker-compose up -d afterwards."