#!/usr/bin/env bash
# Make sure the current directory is the location of this script to simplify matters
#shellcheck disable=SC1090
cd "$(dirname "$(readlink -f $0)")" || { echo "Error: Failed to cd to script directory!" >&2; exit 1; };
################
### Settings ###
################

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

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

###
# Custom Settings
###

# Put any custom settings here.
docs_output_folder="./docs";

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

deploy_root_dir="powahroot";

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

# 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";
	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 "    ${CACTION}docs${RS}          - Render the API docs to HTML";
	echo -e "    ${CACTION}docs-watch${RS}    - Auto-update the docs on source file modification";
	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;
	check_command jq 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_docs() {
	task_begin "Rendering API docs";
	
	subtask_begin "Altering git remote";
	remote_name="$(git remote | head -n1)";
	remote_url="$(git remote get-url "${remote_name}")";
	git remote set-url "${remote_name}" "https://github.com/sbrl/powahroot.git";
	subtask_end $? "Failed to alter git remote";
	
	subtask_begin "Calling 'documentation'";
	node_modules/.bin/documentation build --github --output "${docs_output_folder}" --format html --favicon "logo.png" "$(jq --raw-output .main <package.json)";
	subtask_end $? "'documentation' exited with an error";
	
	subtask_begin "Reverting git remote alteration";
	git remote set-url "${remote_name}" "${remote_url}";
	subtask_end $? "Failed to revert remote alteration";
	
	subtask_begin "Linking logo to docs folder";
	cp -al "logo.png" "${docs_output_folder}/logo.png";
	subtask_end $? "Failed to link logo";
	
	subtask_begin "Applying extra CSS";
	cat docs.css >>"$(find "${docs_output_folder}" -iname "*.css" -print -quit)";
	subtask_end $? "Failed to apply additional CSS";
	
	task_end $? "Failed to render API docs";
}

task_docs-watch() {
	check_command inotifywait;
	set_title "Docs Watcher";
	
	echo -e "Watching for changes.";
	while :; do # : = infinite loop
		# Wait for an update
		# inotifywait's non-0 exit code forces an exit for some reason :-/
		# We explicitly *want* word splitting here
		#shellcheck disable=SC2046
		inotifywait -qr --event modify --format '%:e %f' $(find . -iname "*.mjs" -not -path "./node_modules/*") ./docs.css;
		
		# Rebuild the docs
		# This exits on error because of stage_end - we need add a way to make the exit on non-zero optional to lantern
		stage_begin "Rebuilding docs";
		tasks_run docs;
		stage_end $?;
	done
}

task_archive() {
	task_begin "Packing archive";
	tar caf "${ARCHIVE}/powahroot.tar.bz2" "${docs_output_folder}";
	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 "${docs_output_folder}" -type l -exec bash -c 'ln -f "$(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 \"${deploy_root_dir}/docs\"";
		echo "bye";
	) >"${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}/docs
put -r ${docs_output_folder}/* ${deploy_root_dir}/docs/
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 docs archive deploy;
}

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

tasks_run "$@";