#!/usr/bin/env bash

set -e
set -o nounset
set -o pipefail

SCRIPTS=${SCRIPTS:-$HOME/.local/scripts}
THIS_FILE=${BASH_SOURCE[0]}
LOG_LABEL=$(basename "$THIS_FILE")
THIS=${THIS:-$LOG_LABEL}
LOG_FILE=${LOG_FILE:-"$LOG_LABEL.log"}
DEV_ENV=${DEV_ENV:-""}

declare user_flag system_flag prompt_flag mode
declare -a args
user_flag="1"
system_flag="0"
prompt_flag="0"
mode=""

usage() {
	cat <<EOF
Manages the kanata systemd service.

USAGE:

  $ $THIS <command> <flags> <args...>

FLAGS:
  -h | --help:          Show this help page.
	--user:								Setup systemd service as a user service (default).
	--system:							Setup systemd service as a system service.
	--prompt:							Prompt the user to install service as system or user service.

COMMANDS:
  enable:               Enable the kanata service.
  disable:              Disable the kanata service.

  install <kbd>:        Install the systemd service, the 'kbd' argument is passed to 
                        'kanatactl config install' command, to ensure the keyboard configuration
                        is installed otherwise the keyboard may not work when the service is started.

  start:                Start the kanata service.
  status:               Get the status of the kanata service.
  stop:                 Start the kanata service.
  restart:              Restart the kanata service.

EOF
}

# Logging utility function, use in place of echo.
log() {
	logging log --source "$THIS_FILE" "$@"
}

enable_service() {
	log "Enabling kanata service..."
	if [[ $user_flag == "1" ]]; then
		systemctl --user enable --now kanata.service
	else
		sudo systemctl enable --now kanata.service
	fi
}

get_status() {
	log "Getting kanata service status..."
	systemctl status kanata.service
}

prompt_user() {
	log "Prompting user for how they would like to setup kanata systemd service..."
	local choice
	choice=$(echo -e "user\nsystem" | fzf --header "How would you like to setup the kanata systemd service?")
	if [[ $choice == "system" ]]; then
		user_flag="0"
		system_flag="1"
	elif [[ $choice == "user" ]]; then
		user_flag="1"
		system_flag="0"
	else
		exit 1
	fi
}

install_service() {
	local service_dir="user"

	if [[ -z $DEV_ENV ]]; then
		log --error "DEV_ENV is not set properly." && exit 1
	fi
	log "Starting install service..."

	# Ensure the configuration is copied / setup otherwise the keyboard may not work.
	"$SCRIPTS/kanatactl" config install "$@"

	# Prompt the user for how they would like to install the systemd service, if the
	# prompt flag is set.
	[[ $prompt_flag == "1" ]] && prompt_user || exit 1

	[[ $system_flag == "1" ]] && service_dir="system"

	log "Installing kanata service as: '$service_dir' service..."

	if [[ $service_dir == "system" ]]; then
		[[ -f /etc/systemd/system/kanata.service ]] && sudo rm -rf /etc/systemd/system/kanata.service
		sudo cp "$DEV_ENV/env/etc/systemd/system/kanata.service" /etc/systemd/system
		sudo systemctl daemon-reload
		sudo systemctl enable --now kanata.service
	else
		[[ -f ~/.config/systemd/user/kanata.service ]] && rm -rf ~/.config/systemd/user/kanata.service
		mkdir -p ~/.config/systemd/user &>/dev/null
		cp "$DEV_ENV/env/etc/systemd/user/kanata.service" ~/.config/systemd/user
		systemctl --user daemon-reload
		systemctl --user enable --now kanata.service
	fi
}

start_service() {
	log "Starting kanata service..."
	systemctl start kanata.service
}

stop_service() {
	log "Stopping kanata service..."
	sudo systemctl stop kanata.service
}

disable_service() {
	log "Disabling kanata service..."
	stop_service
	sudo systemctl disable kanata.service
}

restart_service() {
	log "Restarting kanata service..."
	sudo systemctl restart kanata.service
}

################################################################################
# MAIN
################################################################################

# Setup logging file and label.
source "$SCRIPTS/hypr/logging"
setup-logging "$LOG_FILE" "$LOG_LABEL"

# Parse flags / arguments.
while [[ $# -gt 0 ]]; do
	if [[ $1 == "-h" ]] || [[ $1 == "--help" ]]; then
		usage && exit 0
	elif [[ $1 == "--user" ]]; then
		user_flag="1"
	elif [[ $1 == "--system" ]]; then
		system_flag="1"
	elif [[ $1 == "--prompt" ]]; then
		prompt_flag="1"
	# Set first non-flag to the mode / subcommand.
	elif [[ -z $mode ]]; then
		mode="$1"
	# Add any other arguments to the 'args' array.
	else
		args+=("$1")
	fi
	shift
done

# Handle mode.
if [[ $mode == "disable" ]]; then
	disable_service && exit $?
elif [[ $mode == "enable" ]]; then
	enable_service && exit $?
elif [[ $mode == "install" ]]; then
	install_service "${args[@]}" && exit $?
elif [[ $mode == "start" ]]; then
	start_service && exit $?
elif [[ $mode == "status" ]]; then
	get_status && exit $?
elif [[ $mode == "stop" ]]; then
	stop_service && exit $?
elif [[ $mode == "restart" ]]; then
	restart_service && exit $?
else
	# If we made it here, then none of the subcommands handled the args.
	usage && exit 1
fi