/*
 * Copyright (C) 2018 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.service.autofill.augmented;

import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.SystemApi;
import android.annotation.TestApi;

/**
 * Response to a {@link FillRequest}.
 *
 * @hide
 */
@SystemApi
@TestApi
public final class FillResponse {

    private final FillWindow mFillWindow;

    private FillResponse(@NonNull Builder builder) {
        mFillWindow = builder.mFillWindow;
    }

    /** @hide */
    @Nullable
    FillWindow getFillWindow() {
        return mFillWindow;
    }

    /**
     * Builder for {@link FillResponse} objects.
     *
     * @hide
     */
    @SystemApi
    @TestApi
    public static final class Builder {

        private FillWindow mFillWindow;

        /**
         * Sets the {@link FillWindow} used to display the Autofill UI.
         *
         * <p>Must be called when the service is handling the request so the Android System can
         * properly synchronize the UI.
         *
         * @return this builder
         */
        @NonNull
        public Builder setFillWindow(@NonNull FillWindow fillWindow) {
            // TODO(b/123100712): check not null / unit test / throw exception if FillWindow not
            // updated yet
            mFillWindow = fillWindow;
            return this;
        }

        /**
         * Builds a new {@link FillResponse} instance.
         *
         * @throws IllegalStateException if any of the following conditions occur:
         * <ol>
         *   <li>{@link #build()} was already called.
         *   <li>No call was made to {@link #setFillWindow(FillWindow)} or
         *   {@ling #setIgnoredIds(List<AutofillId>)}.
         * </ol>
         *
         * @return A built response.
         */
        @NonNull
        public FillResponse build() {
            // TODO(b/123100712): check conditions / add unit test
            return new FillResponse(this);
        }
    }

    // TODO(b/123100811): implement to String
}