#!/bin/sh

PKGVAR="/var/services/homes/jsun/tailscale"
SERVICE_NAME="tailscale"

PID_FILE="${PKGVAR}/tailscaled.pid"
LOG_FILE="${PKGVAR}/tailscaled.stdout.log"
STATE_FILE="${PKGVAR}/tailscaled.state"
SOCKET_FILE="${PKGVAR}/tailscaled.sock"
PORT="41641"

SERVICE_COMMAND="${PKGVAR}/tailscaled \
--state=${STATE_FILE} \
--socket=${SOCKET_FILE} \
--port=$PORT"
#--tun=userspace-networking"

get_pid() {
    echo $(ps | grep tailscaled | grep -v grep | sed -e "s#^ *##" -e "s# .*##")
}

start_daemon() {
    local ts=$(date)
    echo "${ts} Starting ${SERVICE_NAME} with: ${SERVICE_COMMAND}" >${LOG_FILE}
    STATE_DIRECTORY=${PKGVAR} ${SERVICE_COMMAND} 2>&1 | head -30 >>${LOG_FILE} &
    get_pid > ${PID_FILE}
}

stop_daemon() {
    if [ -r "${PID_FILE}" ]; then
        local PID=$(cat "${PID_FILE}")
        local ts=$(date)
        echo "${ts} Stopping ${SERVICE_NAME} service PID=${PID}" >>${LOG_FILE}
        kill -TERM $PID >>${LOG_FILE} 2>&1
        wait_for_status 1 || kill -KILL $PID >>${LOG_FILE} 2>&1
        rm -f "${PID_FILE}" >/dev/null
    fi
}

daemon_status() {
    local pid=$(get_pid)
    if [ -r "${PID_FILE}" ]; then
        local PID=$(cat "${PID_FILE}")
        if [[ "$PID" -eq "$pid" ]]; then
            return
        fi
        rm -f "${PID_FILE}" >/dev/null
    fi
    if [[ $pid ]]; then
    	echo $pid > ${PID_FILE}
    	return
    fi
    return 1
}

wait_for_status() {
    # 20 tries
    # sleeps for 1 second after each try
    local counter=20
    while [ ${counter} -gt 0 ]; do
        daemon_status
        [ $? -eq $1 ] && return
        counter=$((counter - 1))
        sleep 1
    done
    return 1
}

case $1 in
start)
    if daemon_status; then
        exit 0
    else
        start_daemon
        exit $?
    fi
    ;;
stop)
    if daemon_status; then
        stop_daemon
        exit $?
    else
        exit 0
    fi
    ;;
status)
    if daemon_status; then
        echo "${SERVICE_NAME} is running"
        exit 0
    else
        echo "${SERVICE_NAME} is not running"
        exit 3
    fi
    ;;
log)
    exit 0
    ;;
*)
    echo "command $1 is not implemented"
    exit 0
    ;;
esac