/**
 * Copyright (C) 2014 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.server;

import android.annotation.NonNull;
import android.annotation.Nullable;
import android.hardware.soundtrigger.IRecognitionStatusCallback;
import android.hardware.soundtrigger.ModelParams;
import android.hardware.soundtrigger.SoundTrigger;
import android.hardware.soundtrigger.SoundTrigger.Keyphrase;
import android.hardware.soundtrigger.SoundTrigger.KeyphraseSoundModel;
import android.hardware.soundtrigger.SoundTrigger.ModelParamRange;
import android.hardware.soundtrigger.SoundTrigger.ModuleProperties;
import android.hardware.soundtrigger.SoundTrigger.RecognitionConfig;
import android.media.permission.Identity;
import android.os.IBinder;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.List;

/**
 * Provides a local service for managing voice-related recoginition models. This is primarily used
 * by the {@code VoiceInteractionManagerService}.
 */
public interface SoundTriggerInternal {
    /**
     * Return codes for {@link Session#startRecognition(int, KeyphraseSoundModel,
     *      IRecognitionStatusCallback, RecognitionConfig)},
     * {@link Session#stopRecognition(int, IRecognitionStatusCallback)}
     */
    int STATUS_ERROR = SoundTrigger.STATUS_ERROR;
    int STATUS_OK = SoundTrigger.STATUS_OK;

    // Attach to a specific underlying STModule
    /**
     * Attach to a specific underlying STModule.
     * @param client - Binder token representing the app client for death notifications
     * @param underlyingModule - Properties of the underlying STModule to attach to
     * @param isTrusted - {@code true} if callbacks will be appropriately AppOps attributed by
     * a trusted component prior to delivery to the ultimate client.
     */
    Session attach(@NonNull IBinder client, ModuleProperties underlyingModule, boolean isTrusted);

    // Enumerate possible STModules to attach to
    List<ModuleProperties> listModuleProperties(Identity originatorIdentity);

    interface Session {
        /**
         * Starts recognition for the given keyphraseId.
         *
         * @param keyphraseId The identifier of the keyphrase for which
         *                    the recognition is to be started.
         * @param soundModel  The sound model to use for recognition.
         * @param listener    The listener for the recognition events related to the given
         *                    keyphrase.
         * @param runInBatterySaverMode flag that indicates whether the recognition should continue
         *                              after battery saver mode is enabled.
         * @return One of {@link #STATUS_ERROR} or {@link #STATUS_OK}.
         */
        int startRecognition(int keyphraseId, KeyphraseSoundModel soundModel,
                IRecognitionStatusCallback listener, RecognitionConfig recognitionConfig,
                boolean runInBatterySaverMode);

        /**
         * Stops recognition for the given {@link Keyphrase} if a recognition is
         * currently active.
         *
         * @param keyphraseId The identifier of the keyphrase for which
         *                    the recognition is to be stopped.
         * @param listener    The listener for the recognition events related to the given
         *                    keyphrase.
         * @return One of {@link #STATUS_ERROR} or {@link #STATUS_OK}.
         */
        int stopRecognition(int keyphraseId, IRecognitionStatusCallback listener);

        ModuleProperties getModuleProperties();

        /**
         * Set a model specific {@link ModelParams} with the given value. This
         * parameter will keep its value for the duration the model is loaded regardless of starting
         * and
         * stopping recognition. Once the model is unloaded, the value will be lost.
         * {@link #queryParameter} should be checked first before calling this
         * method.
         *
         * @param keyphraseId The identifier of the keyphrase for which
         *                    to modify model parameters
         * @param modelParam  {@link ModelParams}
         * @param value       Value to set
         * @return - {@link SoundTrigger#STATUS_OK} in case of success
         * - {@link SoundTrigger#STATUS_NO_INIT} if the native service cannot be reached
         * - {@link SoundTrigger#STATUS_BAD_VALUE} invalid input parameter
         * - {@link SoundTrigger#STATUS_INVALID_OPERATION} if the call is out of sequence or
         * if API is not supported by HAL
         */
        int setParameter(int keyphraseId, @ModelParams int modelParam, int value);

        /**
         * Get a model specific {@link ModelParams}. This parameter will keep its value
         * for the duration the model is loaded regardless of starting and stopping recognition.
         * Once the model is unloaded, the value will be lost. If the value is not set, a default
         * value is returned. See ModelParams for parameter default values.
         * {{@link #queryParameter}} should be checked first before calling this
         * method.
         *
         * @param keyphraseId The identifier of the keyphrase for which
         *                    to modify model parameters
         * @param modelParam  {@link ModelParams}
         * @return value of parameter
         * @throws UnsupportedOperationException if hal or model do not support this API.
         *                                       queryParameter should be checked first.
         * @throws IllegalArgumentException      if invalid model handle or parameter is passed.
         *                                       queryParameter should be checked first.
         */
        int getParameter(int keyphraseId, @ModelParams int modelParam);

        /**
         * Determine if parameter control is supported for the given model handle.
         * This method should be checked prior to calling {@link #setParameter}
         * or {@link #getParameter}.
         *
         * @param keyphraseId The identifier of the keyphrase for which
         *                    to modify model parameters
         * @param modelParam  {@link ModelParams}
         * @return supported range of parameter, null if not supported
         */
        @Nullable
        ModelParamRange queryParameter(int keyphraseId,
                @ModelParams int modelParam);

        /**
         * Invalidates the sound trigger session and clears any associated resources. Subsequent
         * calls to this object will throw IllegalStateException.
         */
        void detach();

        /**
         * Unloads (and stops if running) the given keyphraseId
         */
        int unloadKeyphraseModel(int keyphaseId);
    }
}