#!/bin/bash
# UNO Monitor Sender v.0.1.0
# Kidacro <kidacro@archamedis.net>
# https://kidacro.archamedis.net/git/kidacro/Arduino/src/branch/main/uno-stats-monitor
# 
# monitor_sender.sh - Bash stats sender suitable for cron
# 
# Input Schema:
#  Start char is: '#'
#  End char is: '@'
#  2nd char denotes which line number/mode to use
# 
# Setting Schema:
#  LCDLength:LCDRows:LCDDelay:LEDBrightness:LEDDelay
#  16:2:5:0:3#
#
# Example:
#  Line 1: #1Archamedis Status@
#  Line 2: #299% free / etc.@
#  LAVG -: #324@
#  LSET 0: #016:2:5:0:3@
#
# Output Schema:
#  Multimedia Controls use single characters to denote which button was pressed
#    P power
#    M mute
#    m mode
#    p pause/play
#    b back
#    f forward
#    e eq
#    - vol down
#    + vol up
#    r return
#    u usb scan
#    0 number 0
#    1 number 1
#    2 number 2
#    3 number 3
#    4 number 4
#    5 number 5
#    6 number 6
#    7 number 7
#    8 number 8
#    9 number 9
#    R repeat
#    Z other button pressed

# TTY Device to use
TTY="/dev/ttyACM0"

# Arduino Settings
LCDLength=16
LCDRows=2
LCDDelay=5 
LEDBrightness=0
LEDDelay=3
##########################################################

round() {
  printf "%.${2}f" "${1}"
}

# Stats
# we are limited to 2 lines and 16 chars per line so, light stats & no labels
#CLOAD=$(mpstat | awk '$3 ~ /CPU/ { for(i=1;i<=NF;i++) { if ($i ~ /%idle/) field=i } } $3 ~ /all/ { printf("%d%%",100 - $field) }')
#CLOAD=$(cat <(grep 'cpu ' /proc/stat) <(sleep 1 && grep 'cpu ' /proc/stat) | awk -v RS="" '{print ($13-$2+$15-$4)*100/($13-$2+$15-$4+$16-$5)}')

CLOAD=$(awk '{u=$2+$4; t=$2+$4+$5; if (NR==1){u1=u; t1=t;} else print ($2+$4-u1) * 100 / (t-t1) "%"; }' <(grep 'cpu ' /proc/stat) <(sleep 0.5;grep 'cpu ' /proc/stat))
CLOAD=${CLOAD:0:-1}
CLOAD=$(round ${CLOAD} 0)

CTEMP=$(sensors | grep TSI0_TEMP: | tr '°+' ' ' | awk '{print $2}' | paste -sd ', ')C

MFREE=$(free -h | grep Mem | awk '{print $4}' | paste -sd ', ')

RFREE=$(df -h | grep /dev/nvme0n1p3 | awk '{print $4}' | paste -sd ', ')
LFREE=$(df -h | grep /dev/sdc1 | awk '{print $4}' | paste -sd ', ')
SFREE=$(df -h | grep /dev/mapper/store0-lvol1 | awk '{print $4}' | paste -sd ', ')

# setup device
stty -F $TTY ispeed 9600 ospeed 9600 -ignpar cs8 -cstopb -echo -hupcl

# send settings
LINE0="#0$LCDLength:$LCDRows:$LCDDelay:$LEDBrightness:$LEDDelay@"
/usr/bin/echo "$LINE0" > $TTY
echo Sending to $TTY: $LINE0

# line 1
LINE1="#1$CLOAD% $CTEMP $MFREE@"
/usr/bin/echo "$LINE1" > $TTY
echo Sending to $TTY: $LINE1

# line 2
LINE2="#2$RFREE $LFREE $SFREE@"
/usr/bin/echo "$LINE2" > $TTY
echo Sending to $TTY: $LINE2

# load average
LINE3="#-$CLOAD@"
/usr/bin/echo "$LINE3" > $TTY
echo Sending to $TTY: $LINE3