#!/usr/bin/env bash

CURRENT_DIR="$( dirname ${BASH_SOURCE[0]} )"

source "$CURRENT_DIR/../helpers.sh"
source "$CURRENT_DIR/../variables.sh"

template() {
	local tmux_start_script="$1"
	shift
	local options="$@"
	local content=""

	read -r -d '' content <<-EOF
	[Unit]
	Description=tmux default session (detached)
	Documentation=man:tmux(1)

	[Service]
	Type=forking
	Environment=DISPLAY=:0
	ExecStart=${systemd_tmux_server_start_cmd}

	ExecStop=${HOME}/.tmux/plugins/tmux-resurrect/scripts/save.sh
	ExecStop=/usr/bin/tmux kill-server
	KillMode=none

	RestartSec=2

	[Install]
	WantedBy=default.target
	EOF

	echo "$content"
}

systemd_tmux_is_enabled() {
	systemctl --user is_enabled $(basename "${systemd_unit_file_path}") >/dev/null 2>&1
}

enable_tmux_unit_on_boot() {
	if ! systemd_tmux_is_enabled; then
		systemctl --user enable ${systemd_service_name}
	fi
}

main() {
	local options="$(get_tmux_option "$auto_start_config_option" "${auto_start_config_default}")"
	# start tmux with a temporary session
	local systemd_tmux_server_start_cmd_default="/usr/bin/tmux $(get_tmux_option "${systemd_tmux_server_start_cmd_option}" "${systemd_tmux_server_start_cmd_default}" ) -s ${tmux_server_session_temporary}"
	# adds sleep to give tmux some time to finish dettached subprocess  "fetch_and_run_tmux_resurrect_restore_script"
	# and kills tmux temporary session
	local systemd_tmux_server_start_cmd="${systemd_tmux_server_start_cmd_default} && sleep 2 && /usr/bin/tmux kill-session -t ${tmux_server_session_temporary}"
	local tmux_start_script_path="${CURRENT_DIR}/linux_start_tmux.sh"
	local systemd_unit_file=$(template "${tmux_start_script_path}" "${options}")
	mkdir -p "$(dirname ${systemd_unit_file_path})"
	echo "$systemd_unit_file" > "${systemd_unit_file_path}"
	enable_tmux_unit_on_boot
}
main