#!/usr/bin/env bash

current_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
source $current_dir/base.sh # Get variables from base.

clean_containers()
{
	local base_image_to_clean=$1

	for image_to_delete in "$base_image_to_clean"{,"-tmp"}
	do
		if lxc info $image_to_delete &>/dev/null
		then
			lxc delete $image_to_delete --force
		fi
	done

	for image_to_delete in "$base_image_to_clean-"{"before-install","after-install"}
	do
		if lxc image info $image_to_delete &>/dev/null
		then
			lxc image delete $image_to_delete
		fi
	done
}

wait_container()
{
	restart_container()
	{
		lxc stop "$1"
		lxc start "$1"
	}

	# Try to start the container 3 times.
	local max_try=3
	local i=0
	while [ $i -lt $max_try ]
	do
		i=$(( i +1 ))
		local failstart=0

		# Wait for container to start, we are using systemd to check this,
		# for the sake of brevity.
		for j in $(seq 1 10); do
			if lxc exec "$1" -- /bin/bash -c "systemctl isolate multi-user.target" >/dev/null 2>/dev/null; then
				break
			fi

			if [ "$j" == "10" ]; then
				echo 'Failed to start the container'
				failstart=1

				restart_container "$1"
			fi

			sleep 1s
		done

		# Wait for container to access the internet
		for j in $(seq 1 10); do
			if lxc exec "$1" -- /bin/bash -c "wget -q --spider http://github.com"; then
				break
			fi

			if [ "$j" == "10" ]; then
				echo 'Failed to access the internet'
				failstart=1

				restart_container "$1"
			fi

			sleep 1s
		done

		# Wait dpkg
		for j in $(seq 1 10); do
			if ! lxc exec "$1" -- /bin/bash -c "fuser /var/lib/dpkg/lock > /dev/null 2>&1"; then
				break
			fi

			if [ "$j" == "10" ]; then
				echo 'Waiting too long for lock release'
				failstart=1

				restart_container "$1"
			fi

			sleep 1s
		done

		# Has started and has access to the internet
		if [ $failstart -eq 0 ]
		then
			break
		fi

		# Fail if the container failed to start
		if [ $i -eq $max_try ] && [ $failstart -eq 1 ]
		then
			# Inform GitLab Runner that this is a system failure, so it
			# should be retried.
			exit "$SYSTEM_FAILURE_EXIT_CODE"
		fi
	done
}

rotate_image()
{
	local instance_to_publish=$1
	local alias_image=$2

	# Save the finger print to delete the old image later 
	local finger_print_to_delete=$(lxc image info "$alias_image" | grep Fingerprint | awk '{print $2}')
	local should_restart=0

	# If the container is running, stop it
	if [ $(lxc info $instance_to_publish | grep Status | awk '{print $2}') = "Running" ]
	then
		should_restart=1
		lxc stop "$instance_to_publish"
	fi

	# Create image before install
	lxc publish "$instance_to_publish" --alias "$alias_image"
	# Remove old image
	lxc image delete "$finger_print_to_delete"
	
	if [ $should_restart = 1 ]
	then
		lxc start "$instance_to_publish"
		wait_container "$instance_to_publish"
	fi
}

# These lines are used to extract the dependencies/recommendations from the debian/control file.
# /!\ There's a high risk of lamentable failure if we change the format of this file
get_dependencies()
{
	local debian_version=$1
	local ynh_version=$2

	# To extract the dependencies, we want to retrieve the lines between "^Dependencies:" and the new line that doesn't start with a space (exclusively) . Then, we remove ",", then we remove the version specifiers "(>= X.Y)", then we add simple quotes to packages when there is a pipe (or) 'php-mysql|php-mysqlnd'.
	YUNOHOST_DEPENDENCIES=$(curl https://raw.githubusercontent.com/YunoHost/yunohost/$debian_version-$ynh_version/debian/control 2> /dev/null | sed -n '/^Depends:/,/^\w/{//!p}' | sed -e "s/,//g" -e "s/[(][^)]*[)]//g" -e "s/ | \S\+//g" | grep -v moulinette | grep -v ssowat | tr "\n" " ")
	YUNOHOST_RECOMMENDS=$(curl https://raw.githubusercontent.com/YunoHost/yunohost/$debian_version-$ynh_version/debian/control 2> /dev/null | sed -n '/^Recommends:/,/^\w/{//!p}' | sed -e "s/,//g" -e "s/[(][^)]*[)]//g" -e "s/ | \S\+//g" | tr "\n" " ")
	MOULINETTE_DEPENDENCIES=$(curl https://raw.githubusercontent.com/YunoHost/moulinette/$debian_version-$ynh_version/debian/control 2> /dev/null | sed -n '/^Depends:/,/^\w/{//!p}' | sed -e "s/,//g" -e "s/[(][^)]*[)]//g" -e "s/ | \S\+//g" | tr "\n" " ")
	# Same as above, except that all dependencies are in the same line
	SSOWAT_DEPENDENCIES=$(curl https://raw.githubusercontent.com/YunoHost/ssowat/$debian_version-$ynh_version/debian/control 2> /dev/null | grep '^Depends:' | sed 's/Depends://' | sed -e "s/,//g" -e "s/[(][^)]*[)]//g" -e "s/ | \S\+//g" | tr "\n" " ")
	BUILD_DEPENDENCIES="git-buildpackage postfix python-setuptools python-pip"
	PIP_PKG="mock pip pytest pytest-cov pytest-mock pytest-sugar requests-mock tox ansi2html"
}

rebuild_base_containers()
{
	local debian_version=$1
	local ynh_version=$2
	local arch=$3
	local base_image_to_rebuild="yunohost-$debian_version-$ynh_version"

	lxc launch images:debian/$debian_version/$arch "$base_image_to_rebuild-tmp"
	
	wait_container "$base_image_to_rebuild-tmp"

	if [[ "$debian_version" == "buster" ]]
	then
		lxc config set "$base_image_to_rebuild-tmp" security.nesting true # Need this for buster because it is using apparmor
	fi

	lxc exec "$base_image_to_rebuild-tmp" -- /bin/bash -c "apt-get update"
	lxc exec "$base_image_to_rebuild-tmp" -- /bin/bash -c "apt-get install --assume-yes wget curl"
	# Install Git LFS, git comes pre installed with ubuntu image.
	lxc exec "$base_image_to_rebuild-tmp" -- /bin/bash -c "curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh | bash"
	lxc exec "$base_image_to_rebuild-tmp" -- /bin/bash -c "apt-get install --assume-yes git-lfs"
	# Install gitlab-runner binary since we need for cache/artifacts.
	lxc exec "$base_image_to_rebuild-tmp" -- /bin/bash -c "curl -s https://packages.gitlab.com/install/repositories/runner/gitlab-runner/script.deb.sh | bash"
	lxc exec "$base_image_to_rebuild-tmp" -- /bin/bash -c "apt-get install --assume-yes gitlab-runner"

	if [[ "$debian_version" == "buster" ]]
	then
		INSTALL_SCRIPT="https://raw.githubusercontent.com/YunoHost/install_script/buster-unstable/install_yunohost"
	else
		INSTALL_SCRIPT="https://install.yunohost.org"
	fi

	# Download the YunoHost install script
	lxc exec "$base_image_to_rebuild-tmp" -- /bin/bash -c "curl $INSTALL_SCRIPT > install.sh"
	
	# Patch the YunoHost install script
	lxc exec "$base_image_to_rebuild-tmp" -- /bin/bash -c "sed -i -E 's/(step\s+install_yunohost_packages)/#\1/' install.sh"
	lxc exec "$base_image_to_rebuild-tmp" -- /bin/bash -c "sed -i -E 's/(step\s+restart_services)/#\1/' install.sh"

	# Run the YunoHost install script patched
	lxc exec "$base_image_to_rebuild-tmp" -- /bin/bash -c "cat install.sh | bash -s -- -a -d $ynh_version"

	get_dependencies $debian_version $ynh_version

	# Pre install dependencies
	lxc exec "$base_image_to_rebuild-tmp" -- /bin/bash -c "DEBIAN_FRONTEND=noninteractive SUDO_FORCE_REMOVE=yes apt-get --assume-yes -o Dpkg::Options::=\"--force-confold\" install --assume-yes $YUNOHOST_DEPENDENCIES $YUNOHOST_RECOMMENDS $MOULINETTE_DEPENDENCIES $SSOWAT_DEPENDENCIES $BUILD_DEPENDENCIES"
	lxc exec "$base_image_to_rebuild-tmp" -- /bin/bash -c "pip install -U $PIP_PKG"

	rotate_image "$base_image_to_rebuild-tmp" "$base_image_to_rebuild-before-install"

	# Install YunoHost
	lxc exec "$base_image_to_rebuild-tmp" -- /bin/bash -c "curl $INSTALL_SCRIPT | bash -s -- -a -d $ynh_version"
	
	# Run postinstall
	lxc exec "$base_image_to_rebuild-tmp" -- /bin/bash -c "yunohost tools postinstall -d domain.tld -p the_password --ignore-dyndns"

	rotate_image "$base_image_to_rebuild-tmp" "$base_image_to_rebuild-after-install"

	lxc stop "$base_image_to_rebuild-tmp"

	lxc delete "$base_image_to_rebuild-tmp"
}

update_image() {
	local debian_version=$1
	local ynh_version=$2
	local snapshot=$3
	local image_to_update="yunohost-$debian_version-$ynh_version-$snapshot"

	if ! lxc image info "$image_to_update" &>/dev/null
	then
		echo "Unable to upgrade image $image_to_update"
		return
	fi

	# Start and run upgrade
	lxc launch "$image_to_update" "$image_to_update-tmp"
	
	wait_container "$image_to_update-tmp"

	lxc exec "$image_to_update-tmp" -- /bin/bash -c "apt-get update"
	lxc exec "$image_to_update-tmp" -- /bin/bash -c "apt-get upgrade --assume-yes"
	
	get_dependencies $debian_version $ynh_version

	lxc exec "$image_to_update-tmp" -- /bin/bash -c "DEBIAN_FRONTEND=noninteractive SUDO_FORCE_REMOVE=yes apt-get --assume-yes -o Dpkg::Options::=\"--force-confold\" install --assume-yes $YUNOHOST_DEPENDENCIES $YUNOHOST_RECOMMENDS $MOULINETTE_DEPENDENCIES $SSOWAT_DEPENDENCIES $BUILD_DEPENDENCIES"
	lxc exec "$image_to_update-tmp" -- /bin/bash -c "pip install -U $PIP_PKG"

	rotate_image "$image_to_update-tmp" "$image_to_update"

	lxc stop "$image_to_update-tmp"

	lxc delete "$image_to_update-tmp"
}