#!/bin/bash
gpio mode 7 in

#new name for the file
DATE=$(date +"%Y-%m-%d-%H_%M_%S")

now=$(($(date +%s%N)/1000000))  #current time
prev=$now   #previous time to calculate difference
do_loop=1   #if 1 main loop will be executed
photo_just_shot=0   #set to 1 if photo has just been shot
between_photo_delay=1500    #delay in ms in between photos

while [ $do_loop -eq 1 ]
do
    now=$(($(date +%s%N)/1000000))  #get current time
    passed_ms="$(($now-$prev))" #calcuate difference
    if [ "$photo_just_shot" -eq 1 ]; then   #check if photo has just been taken
        #if photo has been taken, wait for a certain delay
        if [ "$passed_ms" -gt "$between_photo_delay" ]; then
            echo "READY!"
            photo_just_shot=0
        fi

    elif [ "$passed_ms" -gt 10 ]; then #chech every 10ms if button is pressed
        button_state=$(gpio read 7)    #get button state
        if [ $button_state -eq 0 ]; then
            echo "PHOTO!"
            DATE=$(date +"%Y-%m-%d_%H%M%S")
            #photo_just_shot=1  #take photo
            fswebcam -r "1280x720" --no-banner /var/www/$DATE.jpg
        fi
    prev=$now   #set previous time
    fi
done