#!/usr/bin/env bash
# Builds touchinject.apk (a privileged multi-touch gesture injector) from
# Injector.java using the local Android SDK. The APK must be installed under
# /system/priv-app for the INJECT_EVENTS (signature|privileged) permission to
# be granted — see the bottom of this file.
set -euo pipefail
cd "$(dirname "$0")"

SDK=/home/gmp/android-sdk
BT="$SDK/build-tools/35.0.0"
PLAT="$SDK/platforms/android-35/android.jar"

rm -rf build
mkdir -p build/classes
javac -nowarn -source 1.8 -target 1.8 -classpath "$PLAT" -d build/classes Injector.java
"$BT/d8" --release --min-api 24 --lib "$PLAT" --output build build/classes/touch/inject/*.class
# aapt2 resolves the android: namespace against the framework resource
# table, which is shipped inside android.jar (resources.arsc).
"$BT/aapt2" link --manifest AndroidManifest.xml -I "$PLAT" \
    --min-sdk-version 24 --target-sdk-version 35 -o build/base.apk
cp build/base.apk build/touchinject-unsigned.apk
jar uf build/touchinject-unsigned.apk -C build classes.dex

if [ ! -f build/ts.jks ]; then
    keytool -genkeypair -keystore build/ts.jks -storepass android -keypass android \
        -alias ts -dname "CN=TouchInject, OU=Dev" -keyalg RSA -keysize 2048 -validity 10000
fi
"$BT/apksigner" sign --ks build/ts.jks --ks-pass pass:android --key-pass pass:android \
    --out touchinject.apk build/touchinject-unsigned.apk
"$BT/apksigner" verify --print-certs touchinject.apk | head -1
echo "=== DONE: $(pwd)/touchinject.apk"

# --- Install as a privileged system app (emulator, rooted) ---------------
#   SER=emulator-5554
#   adb -s $SER root && adb -s $SER remount
#   adb -s $SER shell mkdir -p /system/priv-app/TouchInject
#   adb -s $SER push touchinject.apk /system/priv-app/TouchInject/TouchInject.apk
#   adb -s $SER shell chmod 644 /system/priv-app/TouchInject/TouchInject.apk
#   adb -s $SER reboot          # permission grant is evaluated at install/boot
#   adb -s $SER wait-for-device && adb -s $SER shell 'while [ -z $(getprop sys.boot_completed) ]; do sleep 1; done'
#   adb -s $SER shell dumpsys package touch.inject | grep -A2 INJECT_EVENTS   # granted=true
#
# --- Inject a gesture ------------------------------------------------------
#   adb -s $SER shell am startservice -n touch.inject/.Injector \
#       -e script "down 1 400 1000 wait 100 down 2 700 1200 wait 100 \
#                  move 1 380 980 move 2 720 1220 wait 50 \
#                  move 1 340 940 move 2 760 1260 wait 50 up 1 up 2"
#   adb -s $SER logcat -d -s TouchInject