/*
 * 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.test.voiceenrollment;

import android.annotation.Nullable;
import android.content.Context;
import android.hardware.soundtrigger.KeyphraseEnrollmentInfo;
import android.hardware.soundtrigger.SoundTrigger;
import android.hardware.soundtrigger.SoundTrigger.Keyphrase;
import android.hardware.soundtrigger.SoundTrigger.KeyphraseSoundModel;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.service.voice.AlwaysOnHotwordDetector;
import android.util.Log;

import com.android.internal.app.IVoiceInteractionManagerService;

/**
 * Utility class for the enrollment operations like enroll;re-enroll & un-enroll.
 */
public class EnrollmentUtil {
    private static final String TAG = "TestEnrollmentUtil";

    /**
     * Activity Action: Show activity for managing the keyphrases for hotword detection.
     * This needs to be defined by an activity that supports enrolling users for hotword/keyphrase
     * detection.
     */
    public static final String ACTION_MANAGE_VOICE_KEYPHRASES =
            KeyphraseEnrollmentInfo.ACTION_MANAGE_VOICE_KEYPHRASES;

    /**
     * Intent extra: The intent extra for the specific manage action that needs to be performed.
     * Possible values are {@link AlwaysOnHotwordDetector#MANAGE_ACTION_ENROLL},
     * {@link AlwaysOnHotwordDetector#MANAGE_ACTION_RE_ENROLL}
     * or {@link AlwaysOnHotwordDetector#MANAGE_ACTION_UN_ENROLL}.
     */
    public static final String EXTRA_VOICE_KEYPHRASE_ACTION =
            KeyphraseEnrollmentInfo.EXTRA_VOICE_KEYPHRASE_ACTION;

    /**
     * Intent extra: The hint text to be shown on the voice keyphrase management UI.
     */
    public static final String EXTRA_VOICE_KEYPHRASE_HINT_TEXT =
            KeyphraseEnrollmentInfo.EXTRA_VOICE_KEYPHRASE_HINT_TEXT;
    /**
     * Intent extra: The voice locale to use while managing the keyphrase.
     */
    public static final String EXTRA_VOICE_KEYPHRASE_LOCALE =
            KeyphraseEnrollmentInfo.EXTRA_VOICE_KEYPHRASE_LOCALE;

    /** Simple recognition of the key phrase */
    public static final int RECOGNITION_MODE_VOICE_TRIGGER =
            SoundTrigger.RECOGNITION_MODE_VOICE_TRIGGER;
    /** Trigger only if one user is identified */
    public static final int RECOGNITION_MODE_USER_IDENTIFICATION =
            SoundTrigger.RECOGNITION_MODE_USER_IDENTIFICATION;

    private final IVoiceInteractionManagerService mModelManagementService;

    public EnrollmentUtil() {
        mModelManagementService = IVoiceInteractionManagerService.Stub.asInterface(
                ServiceManager.getService(Context.VOICE_INTERACTION_MANAGER_SERVICE));
    }

    /**
     * Adds/Updates a sound model.
     * The sound model must contain a valid UUID,
     * exactly 1 keyphrase,
     * and users for which the keyphrase is valid - typically the current user.
     *
     * @param soundModel The sound model to add/update.
     * @return {@code true} if the call succeeds, {@code false} otherwise.
     */
    public boolean addOrUpdateSoundModel(KeyphraseSoundModel soundModel) {
        if (!verifyKeyphraseSoundModel(soundModel)) {
            return false;
        }

        int status = SoundTrigger.STATUS_ERROR;
        try {
            status = mModelManagementService.updateKeyphraseSoundModel(soundModel);
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in updateKeyphraseSoundModel", e);
        }
        return status == SoundTrigger.STATUS_OK;
    }

    /**
     * Gets the sound model for the given keyphrase, null if none exists.
     * This should be used for re-enrollment purposes.
     * If a sound model for a given keyphrase exists, and it needs to be updated,
     * it should be obtained using this method, updated and then passed in to
     * {@link #addOrUpdateSoundModel(KeyphraseSoundModel)} without changing the IDs.
     *
     * @param keyphraseId The keyphrase ID to look-up the sound model for.
     * @param bcp47Locale The locale for with to look up the sound model for.
     * @return The sound model if one was found, null otherwise.
     */
    @Nullable
    public KeyphraseSoundModel getSoundModel(int keyphraseId, String bcp47Locale) {
        if (keyphraseId <= 0) {
            Log.e(TAG, "Keyphrase must have a valid ID");
            return null;
        }

        KeyphraseSoundModel model = null;
        try {
            model = mModelManagementService.getKeyphraseSoundModel(keyphraseId, bcp47Locale);
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in updateKeyphraseSoundModel");
        }

        if (model == null) {
            Log.w(TAG, "No models present for the gien keyphrase ID");
            return null;
        } else {
            return model;
        }
    }

    /**
     * Deletes the sound model for the given keyphrase id.
     *
     * @param keyphraseId The keyphrase ID to look-up the sound model for.
     * @return {@code true} if the call succeeds, {@code false} otherwise.
     */
    @Nullable
    public boolean deleteSoundModel(int keyphraseId, String bcp47Locale) {
        if (keyphraseId <= 0) {
            Log.e(TAG, "Keyphrase must have a valid ID");
            return false;
        }

        int status = SoundTrigger.STATUS_ERROR;
        try {
            status = mModelManagementService.deleteKeyphraseSoundModel(keyphraseId, bcp47Locale);
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in updateKeyphraseSoundModel");
        }
        return status == SoundTrigger.STATUS_OK;
    }

    private boolean verifyKeyphraseSoundModel(KeyphraseSoundModel soundModel) {
        if (soundModel == null) {
            Log.e(TAG, "KeyphraseSoundModel must be non-null");
            return false;
        }
        if (soundModel.uuid == null) {
            Log.e(TAG, "KeyphraseSoundModel must have a UUID");
            return false;
        }
        if (soundModel.data == null) {
            Log.e(TAG, "KeyphraseSoundModel must have data");
            return false;
        }
        if (soundModel.keyphrases == null || soundModel.keyphrases.length != 1) {
            Log.e(TAG, "Keyphrase must be exactly 1");
            return false;
        }
        Keyphrase keyphrase = soundModel.keyphrases[0];
        if (keyphrase.id <= 0) {
            Log.e(TAG, "Keyphrase must have a valid ID");
            return false;
        }
        if (keyphrase.recognitionModes < 0) {
            Log.e(TAG, "Recognition modes must be valid");
            return false;
        }
        if (keyphrase.locale == null) {
            Log.e(TAG, "Locale must not be null");
            return false;
        }
        if (keyphrase.text == null) {
            Log.e(TAG, "Text must not be null");
            return false;
        }
        if (keyphrase.users == null || keyphrase.users.length == 0) {
            Log.e(TAG, "Keyphrase must have valid user(s)");
            return false;
        }
        return true;
    }
}