#!/bin/sh

fullPage=6 # How many pages before a full refresh?

### Do not edit below this line unless you know what you are doing ###

pCount=0
fullPage="$(($fullPage-1))"
update() {
    let pCount+=1

    for i in 1 2 3 4 5 ; do
        echo 19 0 > /proc/eink_fb/update_display
        echo 0 > /sys/devices/platform/eink_fb.0/override_upd_mode
        echo 18 0 > /proc/eink_fb/update_display
        echo 1 > /sys/devices/platform/eink_fb.0/override_upd_mode
        echo 19 4 > /proc/eink_fb/update_display
        usleep 75000
    done

    # Sets the next page turn to be a full refresh
    if [[ "$pCount" -ge "$fullPage" ]]; then
        echo 0 > /sys/devices/platform/eink_fb.0/override_upd_mode
        echo 19 0 > /proc/eink_fb/update_display
        pCount=0
    fi
}

trap "rm /var/run/flashdis.pid ; exit" SIGINT SIGTERM

if [[ ! -e "/var/run/flashdis.pid" ]]; then
    echo $$ > "/var/run/flashdis.pid"
else
    echo "Flash disabler is already running"
    exit 1
fi

# Monitor for eink update
while :; do
    # Check if the modification time has changed (It only really changes for eink updates and occasionally wifi)
    mTime="$(stat -c %Y /var/log/messages 2> /dev/null)"
    if [[ "$mTime" -gt "$oldmTime" -a "$mTime" != "" ]]; then
        update
    fi
    # Don't update if the last update was within a second (May be a bad idea)
    oldmTime="$(($mTime+1))"
    usleep 250000
done