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#!/bin/bash
#
# source https://github.com/zielmicha/adb-wrapper
#
# argument: apk package
# Set permission android.permission.SET_ANIMATION_SCALE for each device.
# ex: sh set_animation_permissions.sh <package>
#

adb=$ANDROID_HOME/platform-tools/adb
package=$1

if [ "$#" = 0 ]; then
    echo "No parameters found, run with sh set_animation_permissions.sh <package>"
    exit 0
fi

# get all the devices
devices=$($adb devices | grep -v 'List of devices' | cut -f1 | grep '.')

for device in $devices; do
    echo "Setting permissions to device" $device "for package" $package
    $adb -s $device shell pm grant $package android.permission.SET_ANIMATION_SCALE
done

def appId = "com.example.tests"
def appVersionName = "1.0"
def appVersionCode = 2

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.1"

    defaultConfig {
        applicationId appId
        minSdkVersion 15
        targetSdkVersion 23
        versionCode appVersionCode
        versionName appVersionName

        multiDexEnabled = true // Avoid Bug with java 1.7
        testInstrumentationRunner "com.example.tests.PreparerTestRunner"
        //testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        testBuildType "mock"
    }
}

dependencies {
    androidTestCompile 'com.android.support.test:runner:0.4'
    androidTestCompile 'com.android.support.test:rules:0.4'
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.1'
    androidTestCompile 'com.android.support.test.espresso:espresso-intents:2.2.1'
    androidTestCompile('com.android.support.test.espresso:espresso-contrib:2.2.1') {
        // this library uses the newest app compat v22 but the espresso contrib still v21.
        // you have to specifically exclude the older versions of the contrib library or
        // there will be some conflicts
        exclude group: 'com.android.support', module: 'appcompat'
        exclude group: 'com.android.support', module: 'support-v4'
        exclude module: 'recyclerview-v7'
    }
    androidTestCompile 'junit:junit:4.12'
    androidTestCompile 'com.squareup.retrofit:retrofit-mock:1.9.0'
    androidTestCompile 'com.squareup.assertj:assertj-android:1.1.0'
    androidTestCompile 'com.squareup.spoon:spoon-client:1.2.0'
}

// Grant animation permissions to avoid test failure because of ui sync.
task grantAnimationPermissions(type: Exec, dependsOn: 'installMock') {
    group = 'test'
    description = 'Grant permissions for testing.'

    def absolutePath = file('..') // Get project absolute path
    commandLine "$absolutePath/set_animation_permissions.sh $appId".split(" ")
}

// Source: http://stackoverflow.com/q/29908110/112705
afterEvaluate {
    // When launching individual tests from Android Studio, it seems that only the assemble tasks
    // get called directly, not the install* versions
    tasks.each { task ->
        if (task.name.startsWith('assembleMockAndroidTest')) {
            task.dependsOn grantAnimationPermissions
        }
    }
}

import android.Manifest;
import android.app.KeyguardManager;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.IBinder;
import android.os.PowerManager;
import android.support.test.runner.AndroidJUnitRunner;
import android.util.Log;

import java.lang.reflect.Method;

import static android.content.Context.KEYGUARD_SERVICE;
import static android.content.Context.POWER_SERVICE;
import static android.os.PowerManager.ACQUIRE_CAUSES_WAKEUP;
import static android.os.PowerManager.FULL_WAKE_LOCK;
import static android.os.PowerManager.ON_AFTER_RELEASE;
import static android.support.test.InstrumentationRegistry.getInstrumentation;

/**
 * Tests can fail for other reasons than code, it´ because of the animations and espresso sync and
 * emulator state (screen off or locked)
 *
 * Before all the tests prepare the device to run tests and avoid these problems.
 *
 * - Disable animations
 * - Disable keyguard lock
 * - Set it to be awake all the time (dont let the processor sleep)
 *
 * @see <a href="u2020 open source app by Jake Wharton">https://github.com/JakeWharton/u2020</a>
 * @see <a href="Daj gist">https://gist.github.com/daj/7b48f1b8a92abf960e7b</a>
 * @see <a href="Android-test-kit Disabling Animations">https://code.google.com/p/android-test-kit/wiki/DisablingAnimations</a>
 */
public final class PreparerTestRunner extends AndroidJUnitRunner {

    @Override
    public void onStart() {

        runOnMainSync(() -> {
            Context app = getTargetContext().getApplicationContext();

            disableAnimations(app);

            String name = PreparerTestRunner.class.getSimpleName();
            // Unlock the device so that the tests can input keystrokes.
            KeyguardManager keyguard = (KeyguardManager) app.getSystemService(KEYGUARD_SERVICE);
            keyguard.newKeyguardLock(name).disableKeyguard();
            // Wake up the screen.
            PowerManager power = (PowerManager) app.getSystemService(POWER_SERVICE);
            power.newWakeLock(FULL_WAKE_LOCK | ACQUIRE_CAUSES_WAKEUP | ON_AFTER_RELEASE, name)
                    .acquire();
        });

        super.onStart();
    }

    @Override
    public void finish(int resultCode, Bundle results) {
        super.finish(resultCode, results);
        enableAnimations(getInstrumentation().getContext());
    }

    //<editor-fold desc="Animations">
    void disableAnimations(Context context) {
        int permStatus = context.checkCallingOrSelfPermission(Manifest.permission.SET_ANIMATION_SCALE);
        if (permStatus == PackageManager.PERMISSION_GRANTED) {
            setSystemAnimationsScale(0.0f);
        }
    }

    void enableAnimations(Context context) {
        int permStatus = context.checkCallingOrSelfPermission(Manifest.permission.SET_ANIMATION_SCALE);
        if (permStatus == PackageManager.PERMISSION_GRANTED) {
            setSystemAnimationsScale(1.0f);
        }
    }

    private void setSystemAnimationsScale(float animationScale) {
        try {
            Class<?> windowManagerStubClazz = Class.forName("android.view.IWindowManager$Stub");
            Method asInterface = windowManagerStubClazz.getDeclaredMethod("asInterface", IBinder.class);
            Class<?> serviceManagerClazz = Class.forName("android.os.ServiceManager");
            Method getService = serviceManagerClazz.getDeclaredMethod("getService", String.class);
            Class<?> windowManagerClazz = Class.forName("android.view.IWindowManager");
            Method setAnimationScales = windowManagerClazz.getDeclaredMethod("setAnimationScales", float[].class);
            Method getAnimationScales = windowManagerClazz.getDeclaredMethod("getAnimationScales");

            IBinder windowManagerBinder = (IBinder) getService.invoke(null, "window");
            Object windowManagerObj = asInterface.invoke(null, windowManagerBinder);
            float[] currentScales = (float[]) getAnimationScales.invoke(windowManagerObj);
            for (int i = 0; i < currentScales.length; i++) {
                currentScales[i] = animationScale;
            }
            setAnimationScales.invoke(windowManagerObj, new Object[]{currentScales});
        } catch (Exception e) {
            Log.e("SystemAnimations", "Could not change animation scale to " + animationScale + " :'(");
        }
    }
    //</editor-fold>
}

<?xml version="1.0" encoding="utf-8"?>
<!-- This file should be outside of release manifest (in this case app/src/mock/Manifest.xml -->
<manifest
  xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.example.tests">
  
  <!-- For espresso testing purposes, this is removed in live builds, but not in dev builds -->
  <uses-permission android:name="android.permission.SET_ANIMATION_SCALE" />
  <uses-permission android:name="android.permission.DISABLE_KEYGUARD" />
  <uses-permission android:name="android.permission.WAKE_LOCK" />

</manifest>