/*
 * Copyright (C) 2023 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 android.app.appsearch.testutil;

import android.annotation.NonNull;
import android.app.appsearch.AppSearchBatchResult;
import android.app.appsearch.AppSearchManager;
import android.app.appsearch.AppSearchResult;
import android.app.appsearch.EnterpriseGlobalSearchSession;
import android.app.appsearch.EnterpriseGlobalSearchSessionShim;
import android.app.appsearch.Features;
import android.app.appsearch.GenericDocument;
import android.app.appsearch.GetByDocumentIdRequest;
import android.app.appsearch.GetSchemaResponse;
import android.app.appsearch.SearchResults;
import android.app.appsearch.SearchResultsShim;
import android.app.appsearch.SearchSpec;
import android.app.appsearch.exceptions.AppSearchException;
import android.content.Context;

import androidx.test.core.app.ApplicationProvider;

import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;

import java.util.Objects;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * This test class adapts the AppSearch Framework API to ListenableFuture, so it can be tested via a
 * consistent interface.
 *
 * @hide
 */
public class EnterpriseGlobalSearchSessionShimImpl implements EnterpriseGlobalSearchSessionShim {
    private final EnterpriseGlobalSearchSession mEnterpriseGlobalSearchSession;
    private final ExecutorService mExecutor;

    /** Create an EnterpriseGlobalSearchSession with the application context. */
    @NonNull
    public static ListenableFuture<EnterpriseGlobalSearchSessionShim>
            createEnterpriseGlobalSearchSessionAsync() {
        return createEnterpriseGlobalSearchSessionAsync(
                ApplicationProvider.getApplicationContext());
    }

    /** Only for use when called from a non-instrumented context. */
    @NonNull
    public static ListenableFuture<EnterpriseGlobalSearchSessionShim>
            createEnterpriseGlobalSearchSessionAsync(@NonNull Context context) {
        AppSearchManager appSearchManager = context.getSystemService(AppSearchManager.class);
        SettableFuture<AppSearchResult<EnterpriseGlobalSearchSession>> future = SettableFuture
                .create();
        ExecutorService executor = Executors.newCachedThreadPool();
        appSearchManager.createEnterpriseGlobalSearchSession(executor, future::set);
        return Futures.transformAsync(
                future,
                instance -> {
                    if (!instance.isSuccess()) {
                        return Futures.immediateFailedFuture(
                                new AppSearchException(instance.getResultCode(),
                                        instance.getErrorMessage()));
                    }
                    return Futures.immediateFuture(
                            new EnterpriseGlobalSearchSessionShimImpl(instance.getResultValue(),
                                    executor));
                },
                executor);
    }

    private EnterpriseGlobalSearchSessionShimImpl(
            @NonNull EnterpriseGlobalSearchSession session, @NonNull ExecutorService executor) {
        mEnterpriseGlobalSearchSession = Objects.requireNonNull(session);
        mExecutor = Objects.requireNonNull(executor);
    }

    @NonNull
    @Override
    public ListenableFuture<AppSearchBatchResult<String, GenericDocument>> getByDocumentIdAsync(
            @NonNull String packageName,
            @NonNull String databaseName,
            @NonNull GetByDocumentIdRequest request) {
        SettableFuture<AppSearchBatchResult<String, GenericDocument>> future =
                SettableFuture.create();
        mEnterpriseGlobalSearchSession.getByDocumentId(
                packageName, databaseName, request, mExecutor,
                new BatchResultCallbackAdapter<>(future));
        return future;
    }

    @NonNull
    @Override
    public SearchResultsShim search(
            @NonNull String queryExpression, @NonNull SearchSpec searchSpec) {
        SearchResults searchResults = mEnterpriseGlobalSearchSession.search(queryExpression,
                searchSpec);
        return new SearchResultsShimImpl(searchResults, mExecutor);
    }

    @NonNull
    @Override
    public ListenableFuture<GetSchemaResponse> getSchemaAsync(
            @NonNull String packageName, @NonNull String databaseName) {
        SettableFuture<AppSearchResult<GetSchemaResponse>> future = SettableFuture.create();
        mEnterpriseGlobalSearchSession.getSchema(packageName, databaseName, mExecutor, future::set);
        return Futures.transformAsync(future, this::transformResult, mExecutor);
    }

    @NonNull
    @Override
    public Features getFeatures() {
        return new MainlineFeaturesImpl();
    }

    private <T> ListenableFuture<T> transformResult(
            @NonNull AppSearchResult<T> result) throws AppSearchException {
        if (!result.isSuccess()) {
            throw new AppSearchException(result.getResultCode(), result.getErrorMessage());
        }
        return Futures.immediateFuture(result.getResultValue());
    }
}