/*
 * Copyright (C) 2019 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.android.launcher3.util.rule;

import static androidx.test.InstrumentationRegistry.getInstrumentation;

import static org.junit.Assume.assumeTrue;

import android.content.pm.PackageManager;
import android.os.Build;
import android.util.Log;

import androidx.test.InstrumentationRegistry;
import androidx.test.uiautomator.UiDevice;

import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class TestStabilityRule implements TestRule {
    private static final String TAG = "TestStabilityRule";
    private static final Pattern LAUNCHER_BUILD =
            Pattern.compile("^("
                    + "(?<local>(BuildFromAndroidStudio|"
                    + "([0-9]+|[A-Z])-eng\\.[a-z]+\\.[0-9]+\\.[0-9]+))|"
                    + "(?<platform>([A-Z][a-z]*[0-9]*|[0-9]+)*)"
                    + ")$");
    private static final Pattern PLATFORM_BUILD =
            Pattern.compile("^("
                    + "(?<commandLine>eng\\.[a-z]+\\.[0-9]+\\.[0-9]+)|"
                    + "(?<presubmit>P[0-9]+)|"
                    + "(?<postsubmit>[0-9]+)"
                    + ")$");

    public static final int LOCAL = 0x1;
    public static final int PLATFORM_PRESUBMIT = 0x8;
    public static final int PLATFORM_POSTSUBMIT = 0x10;

    private static int sRunFlavor;

    @Retention(RetentionPolicy.RUNTIME)
    @Target(ElementType.METHOD)
    public @interface Stability {
        int flavors();
    }

    @Override
    public Statement apply(Statement base, Description description) {
        final Stability stability = description.getAnnotation(Stability.class);
        if (stability != null) {
            return new Statement() {
                @Override
                public void evaluate() throws Throwable {
                    assumeTrue("Ignoring the test due to @Stability annotation",
                            (stability.flavors() & getRunFlavor()) != 0);
                    base.evaluate();
                }
            };
        } else {
            return base;
        }
    }

    public static int getRunFlavor() {
        if (sRunFlavor != 0) return sRunFlavor;
        if (isRobolectricTest()) return PLATFORM_POSTSUBMIT;

        final String flavorOverride = InstrumentationRegistry.getArguments().getString("flavor");

        if (flavorOverride != null) {
            Log.d(TAG, "Flavor override: " + flavorOverride);
            try {
                return (int) TestStabilityRule.class.getField(flavorOverride).get(null);
            } catch (NoSuchFieldException e) {
                throw new AssertionError("Unrecognized run flavor override: " + flavorOverride);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            }
        }

        final String launcherVersion;
        try {
            final String launcherPackageName = UiDevice.getInstance(getInstrumentation())
                    .getLauncherPackageName();
            Log.d(TAG, "Launcher package: " + launcherPackageName);

            launcherVersion = getInstrumentation().
                    getContext().
                    getPackageManager().
                    getPackageInfo(launcherPackageName, 0)
                    .versionName;
        } catch (PackageManager.NameNotFoundException e) {
            throw new RuntimeException(e);
        }

        final String platformVersion = Build.VERSION.INCREMENTAL;

        Log.d(TAG, "Launcher: " + launcherVersion + ", platform: " + platformVersion);

        final Matcher launcherBuildMatcher = LAUNCHER_BUILD.matcher(launcherVersion);
        if (!launcherBuildMatcher.find()) {
            throw new AssertionError("Launcher build match not found");
        }

        final Matcher platformBuildMatcher = PLATFORM_BUILD.matcher(platformVersion);
        if (!platformBuildMatcher.find()) {
            throw new AssertionError("Platform build match not found");
        }

        if (launcherBuildMatcher.group("local") != null && (
                platformBuildMatcher.group("commandLine") != null ||
                        platformBuildMatcher.group("postsubmit") != null)) {
            Log.d(TAG, "LOCAL RUN");
            sRunFlavor = LOCAL;
        } else if (launcherBuildMatcher.group("platform") != null
                && platformBuildMatcher.group("presubmit") != null) {
            Log.d(TAG, "PLATFORM PRESUBMIT");
            sRunFlavor = PLATFORM_PRESUBMIT;
        } else if (launcherBuildMatcher.group("platform") != null
                && (platformBuildMatcher.group("postsubmit") != null
                || platformBuildMatcher.group("commandLine") != null)) {
            Log.d(TAG, "PLATFORM POSTSUBMIT");
            sRunFlavor = PLATFORM_POSTSUBMIT;
        } else {
            throw new AssertionError("Unrecognized run flavor");
        }

        return sRunFlavor;
    }

    public static boolean isPresubmit() {
        return getRunFlavor() == PLATFORM_PRESUBMIT;
    }

    public static boolean isRobolectricTest() {
        return Build.FINGERPRINT.contains("robolectric");
    }
}