#!/bin/bash

#RESOLUTION="1280x720"
RESOLUTION="1920x1080"
VIDEODEV="/dev/video10"

function unlock {
	### Activates the screen and unlocks the phone
	# Reads the current screen state eturns any combination of ON/OFF and
	# LOCKED/UNLOCKED (i.e. OFF_LOCKED).
	# Works only on NFC enabled phones but alternative methods exist.
	IFS='_' read -ra screenstate <<< $(adb shell dumpsys nfc | awk -F'=' \
		'/mScreenState/ {print $2}')
	# Emulate Power-Button press if screen is OFF.
	[[ ${screenstate[0]} == "OFF" ]] && adb shell input keyevent 26 && \
		echo Screen activated
	# Emulate Menu-button press if phone is locked. Requires the phone to
	# unlock without PIN or password.
	[[ ${screenstate[1]} == "LOCKED" ]] && adb shell input keyevent 82 && \
		echo Device unlocked
}

function blank {
	### Blanks the screen after X seconds
	sleep ${1}
	IFS='_' read -ra screenstate <<< $(adb shell dumpsys nfc | awk -F'=' \
		'/mScreenState/ {print $2}')
	[[ ${screenstate[0]} == "ON" ]] && adb shell input keyevent 26 && \
		echo Screen deactivated
}

function end {
	### Cleans up after exiting
	# Stop DroidCamX on device
	echo "Stopping DroidCamX"
	adb shell am force-stop com.dev47apps.droidcamx
	# blank device
	blank 0
}

# Unlock phone
unlock

# Start DroidCamX app, intent may vary for free DroidCam version
echo "(Re-)Starting DroidCamX"
adb shell <<  EOF
am force-stop com.dev47apps.droidcamx
am start -n com.dev47apps.droidcamx/com.dev47apps.droidcamx.DroidCamX
EOF

# Wait some seconds for the app to settle
sleep 3

# Initiate screen blanking in X seconds (mind the background function "&")
x=10
blank ${x} &

# Start droidcam binary
# 1920x1080 breaks Skype!
echo ""
echo "+-------------------------------------------------------------+"
echo "|                                                             |"
echo "| SCREEN WILL BLANK IN ${x} SECONDS. CONNECT WITHIN THIS LIMIT! |"
echo "|                                                             |"
echo "+-------------------------------------------------------------+"
echo ""
/usr/bin/droidcam -v -dev=${VIDEODEV} -size=${RESOLUTION} adb 4747 > /dev/null

# Cleanup when droidcam binary exited
end