#!/usr/bin/env bash
# Make sure the current directory is the location of this script to simplify matters
cd "$(dirname "$(readlink -f "$0")")" || { echo "Error: Failed to cd to script directory (wat?)." >&2; exit 1; };
################
### Settings ###
################

# The name of this project
project_name="tfsummaryvis";

# The path to the lantern build engine git submodule
lantern_path="./lantern-build-engine";

###
# Custom Settings
###

# Put any custom settings here.
dirpath_output="./dist";

# Deployment settings
deploy_ssh_user="ci";
deploy_ssh_host="starbeamrainbowlabs.com";
deploy_ssh_port=2403;

deploy_root_dir="tfsummaryvis";

###############################################################################

# Check out the lantern git submodule if needed
if [ ! -f "${lantern_path}/lantern.sh" ]; then git submodule update --init "${lantern_path}"; fi

source "${lantern_path}/lantern.sh";

if [[ "$#" -lt 1 ]]; then
	echo -e "${FBLE}${project_name}${RS} build script";
	echo -e "    by Starbeamrainbowlabs";
	#shellcheck disable=SC2154
	echo -e "${LC}Powered by the lantern build engine, v${version}${RS}";
	echo -e "";
	echo -e "${CSECTION}Usage${RS}";
	echo -e "    ./build ${CTOKEN}{action}${RS} ${CTOKEN}{action}${RS} ${CTOKEN}{action}${RS} ...";
	echo -e "";
	echo -e "${CSECTION}Available actions${RS}";
	echo -e "    ${CACTION}setup${RS}         - Perform initial setup";
	echo -e "    ${CACTION}build${RS}         - Build the site with esbuild";
	echo -e "    ${CACTION}archive${RS}       - Create an archive of CI artifacts";
	echo -e "    ${CACTION}ci${RS}            - Do CI tasks";
	echo -e "";
	
	exit 1;
fi

###############################################################################

task_setup() {
	
	task_begin "Checking environment";
	check_command git true;
	check_command node true;
	check_command npm true;
	task_end $?;
	
	task_begin "Initialising submodules";
	git submodule update --init;
	task_end $? "Failed to initialise submodules";
	
	task_begin "Installing dependencies";
	npm install;
	task_end $? "Failed to install dependencies";
}

task_build() {
	task_begin "Rendering site";
	npm run build;
	task_end $? "Failed to render site";
}

task_archive() {
	task_begin "Packing archive";
	tar caf "${ARCHIVE}/${project_name}.tar.bz2" "${dirpath_output}";
	task_end $?;
}

task_deploy() {
	stage_begin "Deploying to ${deploy_ssh_host}....";
	if [ "${SSH_KEY_PATH}" == "" ]; then
		echo "${FRED}${HC}Error: Can't find the SSH key as the environment variable SSH_KEY_PATH isn't set.${RS}" >&2;
		stage_end 1;
	fi
	
	task_begin "Preparing upload";
	subtask_begin "Unwinding symlinks";
	find "${dirpath_output}" -type l -exec bash -c 'ln -f "$(readlink -m "$0")" "$0"' {} \;
	subtask_end $?;
	task_end $?;
	
	# Acquire an exclusive project-wide lock so that we only upload stuff one-at-a-time
	task_begin "Acquiring upload lock";
	exec 9<"${WORKSPACE}";
	flock --exclusive 9;
	task_end $? "Failed to acquire lock!";
	
	task_begin "Cleaning up old release";
	lftp_commands_filename="$(mktemp --suffix "-commands.lftp")";
	(
		echo "set sftp:connect-program 'ssh -x -i ${SSH_KEY_PATH}'";
		# We have an extra : before the @ here to avoid the password prompt
		echo "connect sftp://${deploy_ssh_user}:@${deploy_ssh_host}:${deploy_ssh_port}";
		echo "rm -r \"${deploy_root_dir}/www\"";
		echo "bye";
	) >"${lftp_commands_filename}";
	
	execute lftp --version;
	execute cat "${lftp_commands_filename}";
	execute lftp -f "${lftp_commands_filename}";
	task_end $? "Failed to cleanup old release";
	
	task_begin "Uploading new release";
	sftp -i "${SSH_KEY_PATH}" -P "${deploy_ssh_port}" -o PasswordAuthentication=no "${deploy_ssh_user}@${deploy_ssh_host}" << SFTPCOMMANDS
mkdir ${deploy_root_dir}/www
put -r ${dirpath_output}/* ${deploy_root_dir}/www/
bye
SFTPCOMMANDS
	task_end $? "Failed to upload new release";

	subtask_begin "Releasing lock";
	exec 9>&- # Close file descriptor 9 and release the lock
	subtask_end $?;
	
	stage_end $? "Failed to deploy to ${deploy_ssh_host}.";
}

task_ci() {
	tasks_run setup build archive deploy;
}

###############################################################################

tasks_run "$@";