#!/bin/bash

set -e

# command to make rotation

# normal, left, inverted or right will be passed as the first arg

COMMAND="$(dirname "$0")/rotate.sh"

# paths to sensor files

DEVICE=/sys/bus/iio/devices/iio:device0

DEVICE_X="$DEVICE/in_accel_x_raw"

DEVICE_Y="$DEVICE/in_accel_y_raw"

# min sensor value to call rotation

THRESHOLD=10000

# time interval in seconds

INTERVAL=2

PREV_ROT=

while true; do

    X="$(cat "$DEVICE/in_accel_x_raw")"

    Y="$(cat "$DEVICE/in_accel_y_raw")"

    ROT="$PREV_ROT"

    if [ "$X" -gt "$THRESHOLD" ]; then

        ROT="normal"

    elif [ "$X" -lt "-$THRESHOLD" ]; then

        ROT="inverted"

    elif [ "$Y" -gt "$THRESHOLD" ]; then

        ROT="right"

    elif [ "$Y" -lt "-$THRESHOLD" ]; then

        ROT="left"

    fi

    if [ "$ROT" != "$PREV_ROT" ]; then

        "$COMMAND" "$ROT"

        PREV_ROT="$ROT"

        # double wait immediatelly after rotation

        sleep "$INTERVAL"

    fi

    sleep "$INTERVAL"

done