#!/bin/sh

# takes a screenshot of the currently focused window every n seconds
# and saves it in a directory.
# usage: take-screenshots-in-intervals [interval destination_dir]
# dependencies: scrot

image_width=400
interval=1000
destination_root="$HOME/interval-screenhots"

if test "$1"
then
  interval="$1"
fi

if test "$2"
then
  destination_root="$2"
fi

echo "destination: $destination_root, interval: ${interval}s"

day_seconds() {
  now=$(date -u '+%s')
  midnight=$(date -u -d 'today 00:00:00' '+%s')
  echo $((now - midnight))
}

scale_image() {
  width=$1
  path=$2
  temp_path=$(dirname "$path")/scaled_$(basename "$path")
  gm convert -size "$width>x" "$path" -auto-orient -resize "${width}x${width}>" "+profile" "*" "$temp_path" &&
    mv "$temp_path" "$path"
}

while true; do
  # the date may change while this loop is running
  date=$(date -u +%Y-%m-%d.%j)
  directory="$destination_root/$date"
  mkdir -p $directory
  full_path="$directory/$(day_seconds).jpg"
  scrot --focused --quality 85 "$full_path" && scale_image $image_width "$full_path"
  sleep $interval
done