#/bin/bash

trap 'stty sane; clear; exit 0' SIGINT SIGTERM

dir="$(dirname "$0")"
[ -f "$dir/webcam.conf" ] && source "$dir/webcam.conf"

BRIGHTNESS="${DEFAULT_BRIGHTNESS:-auto}"
EXPOSURE="${DEFAULT_EXPOSURE:-auto}"
STEP="${STEP:-5}"

# clamps $1+$2 to 0-100, treating "auto" as a 50 starting point
adjust() {
    local cur=$1 delta=$2 val
    [ "$cur" = "auto" ] && cur=50
    val=$((cur + delta))
    (( val < 0 )) && val=0
    (( val > 100 )) && val=100
    echo "$val"
}

while true; do
    clear
    export BRIGHTNESS EXPOSURE
    ./webcam2ascii.sh
    echo
    echo "brightness: ${BRIGHTNESS}   exposure: ${EXPOSURE}"
    echo "[+/-] brightness   [./,] exposure   [r] reset to auto   [c] capture   [Ctrl+C] quit"

    if read -n 1 -t 0.05 -s key; then
        case "$key" in
            "+") BRIGHTNESS=$(adjust "$BRIGHTNESS" "$STEP") ;;
            "-") BRIGHTNESS=$(adjust "$BRIGHTNESS" "-$STEP") ;;
            ".") EXPOSURE=$(adjust "$EXPOSURE" "$STEP") ;;
            ",") EXPOSURE=$(adjust "$EXPOSURE" "-$STEP") ;;
            r|R) BRIGHTNESS="${DEFAULT_BRIGHTNESS:-auto}"; EXPOSURE="${DEFAULT_EXPOSURE:-auto}" ;;
            c|C)
                timestamp=$(date +%Y%m%d-%H%M%S)
                cp web-cam-shot.jpg "photo-$timestamp.jpg"
                cp ascii-img.txt "ascii-img-$timestamp.txt"
                clear
                cat "ascii-img-$timestamp.txt"
                echo
                echo "Saved photo-$timestamp.jpg and ascii-img-$timestamp.txt"
                ./txt2printr.sh "ascii-img-$timestamp.txt"
                read -n 1 -s -p "Press any key to resume live preview, Ctrl+C to quit..."
                ;;
        esac
    fi
done