#!/usr/bin/env sh

export DISPLAY=":0.0"

OLDDB=/home/pi/incoming_dbs/tech_intern.db
NEWDB=/home/pi/incoming_dbs/tech_intern.db.new

usage () {
cat << EOF
Usage: $0 [COMMAND]

Commands:
  --restart-bd       Restart Bottledash
  --reload-browser   Reload dashboard/browser
  --reload           Restart Bottledash and reload the dashboard/browser
  --check-db         Check if a new DB is available
  --smart-reload     If a new DB is available, restart Bottledash and reload
                     the dashboard/browser
  -h, --help         This help
EOF
}

start_bottledash () {
        # taken from start-bottledash-hohup
        nohup python3 /home/pi/bottledash/dash.py 2>&1 > $HOME/bottledash.log &
        echo $! > $HOME/pid_bottledash
}

stop_bottledash () {
        kill $(cat $HOME/pid_bottledash)
}

start_chromium () {
        # taken from show-dashboard
        rm -R $HOME/.cache/chromium/Default/Cache/
	DISPLAY=:0.0 nohup chromium --new --noerrdialogs --kiosk \
		http://localhost:8080 2>&1 > $HOME/show-dashboard.log &
        echo $! > $HOME/pid_chromium
}


stop_chromium () {
        kill $(cat pid_chromium)
}

xdo_reload_chromium () {
	# Start Chromium if necessary
	if [ -f "$HOME/pid_bottledash" ] && [ -d /proc/$(cat "$HOME/pid_chromium") ]; then
		# Send F5 to Chromium
		WID=$(xdotool search --onlyvisible --class chromium | head -1)
		xdotool windowactivate ${WID}
		xdotool key F5
	else
		start_chromium
	fi	
}

check_new_db () {
        if [ ! -f "$NEWDB"  ]; then
                echo 0 ; return
        fi
        OLDSIZE=$(md5sum $OLDDB | awk '{print $1}')
        NEWSIZE=$(md5sum $NEWDB | awk '{print $1}')
        if [ "$OLDSIZE" != "$NEWSIZE" ]; then
                echo 1
        else
                echo 0
        fi
}

update_db () {
        if [ $(check_new_db) -eq 1 ]; then
                mv "$NEWDB" "$OLDDB"
        fi
}

case $1 in
        '--restart-bd')
                stop_bottledash
                start_bottledash
                ;;
        '--reload-browser')
                xdo_reload_chromium
                ;;
        '--reload')
                stop_bottledash
                start_bottledash
                sleep 10
                xdo_reload_chromium
                ;;
        '--check-db')
                check_new_db
                ;;
        '--smart-reload')
                if [ $(check_new_db) -eq 1 ]; then
                        update_db
                        stop_bottledash
                        start_bottledash
                        sleep 10
                        xdo_reload_chromium
                fi
                ;;
        '-h'|'--help')
                usage
                exit 0
                ;;
        *)
                echo "ERROR: unknown command: $1" >&2
                usage
                exit 2
                ;;
esac

# vim: set ft=sh :