/**
 * Copyright (C) 2022 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.telephony.imsmedia;

import android.os.Parcel;
import android.telephony.ims.RtpHeaderExtension;
import android.telephony.imsmedia.AudioConfig;
import android.telephony.imsmedia.MediaQualityThreshold;
import android.util.Log;

import java.util.List;

/** Audio session implementation for internal AP based RTP stack. This handles
 * all API calls from applications and passes it to native library.
 */
public class AudioLocalSession {
    private static final String TAG = "AudioLocalSession";
    private int mSessionId;
    private long mNativeObject = 0;

    /* Instantiates a new audio session based on AP RTP stack
    *
    * @param sessionId : session identifier
    * @param nativeObject : jni object modifier for calling jni methods
    */
    AudioLocalSession(final int sessionId, final long nativeObject) {
        mSessionId = sessionId;
        mNativeObject = nativeObject;
    }

    /** Returns the unique session identifier */
    public int getSessionId() {
        Log.d(TAG, "getSessionId");
        return mSessionId;
    }

    /**
     * Send request message with the corresponding arguments to libimsmediajni library to operate
     *
     * @param sessionId : session identifier
     * @param parcel : parcel argument to send to jni
     */
    public void sendRequest(final int sessionId, final Parcel parcel) {
        if (mNativeObject != 0) {
            if (parcel == null) return;
            byte[] data = parcel.marshall();
            JNIImsMediaService.sendMessage(mNativeObject, sessionId, data);
            parcel.recycle();
        }
    }

    /**
     * Modifies the configuration of the RTP session after the session is opened.
     * It can be used modify the direction, access network, codec parameters
     * RTCP configuration, remote address and remote port number. The service will
     * apply if anything changed in this invocation compared to previous and respond
     * the updated the config in ImsMediaSession#onModifySessionResponse() API
     *
     * @param config provides remote end point info and codec details
     */
    public void modifySession(final AudioConfig config) {
        Log.d(TAG, "modifySession: " + config);
        Parcel parcel = Parcel.obtain();
        parcel.writeInt(AudioSession.CMD_MODIFY_SESSION);
        if (config != null) {
            config.writeToParcel(parcel, 0);
        }
        sendRequest(mSessionId, parcel);
    }

    /**
     * Adds a new remote configuration to a RTP session during early media
     * scenarios where the IMS network could add more than one remote endpoint.
     *
     * @param config provides remote end point info and codec details
     */
    public void addConfig(final AudioConfig config) {
        Log.d(TAG, "addConfig: " + config);
        Parcel parcel = Parcel.obtain();
        parcel.writeInt(AudioSession.CMD_ADD_CONFIG);
        if (config != null) {
            config.writeToParcel(parcel, 0);
        }
        sendRequest(mSessionId, parcel);
    }

    /**
     * Deletes a remote configuration from a RTP session during early media
     * scenarios. A session shall have at least one config so this API shall
     * not delete the last config.
     *
     * @param config remote config to be deleted
     */
    public void deleteConfig(final AudioConfig config) {
        Log.d(TAG, "deleteConfig: " + config);
        Parcel parcel = Parcel.obtain();
        parcel.writeInt(AudioSession.CMD_DELETE_CONFIG);
        if (config != null) {
            config.writeToParcel(parcel, 0);
        }
        sendRequest(mSessionId, parcel);
    }

    /**
     * Confirms a remote configuration for a Rtp session for early media scenarios
     * when there are more than one remote configs. All other early remote configs
     * (potentially including the config created as part of openSession) are auto
     * deleted when one config is confirmed.
     * Confirming a remote configuration is necessary only if additional
     * configurations were created.
     * New remote configurations cannot be added after a remote configuration is
     * confirmed.
     *
     * @param config remote config to be confirmed
     */
    public void confirmConfig(final AudioConfig config) {
        Log.d(TAG, "confirmConfig: " + config);
        Parcel parcel = Parcel.obtain();
        parcel.writeInt(AudioSession.CMD_CONFIRM_CONFIG);
        if (config != null) {
            config.writeToParcel(parcel, 0);
        }
        sendRequest(mSessionId, parcel);
    }

    /**
     * Send DTMF digit until the duration expires.
     *
     * @param dtmfDigit single char having one of 12 values: 0-9, *, #
     * @param duration of the key press in milliseconds.
     */
    public void sendDtmf(final char dtmfDigit, final int duration) {
        Log.d(TAG, "sendDtmf: digit= " + dtmfDigit + ", duration=" + duration);
        Parcel parcel = Parcel.obtain();
        parcel.writeInt(AudioSession.CMD_SEND_DTMF);
        parcel.writeByte((byte)dtmfDigit);
        parcel.writeInt(duration);
        sendRequest(mSessionId, parcel);
    }

    /**
     * Send RTP header extension to the other party in the next RTP packet.
     *
     * @param extensions List of RTP header extensions to be transmitted
     */
    public void sendHeaderExtension(final List<RtpHeaderExtension> extensions) {
        Log.d(TAG, "sendHeaderExtension, extension=" + extensions);
        Parcel parcel = Parcel.obtain();
        parcel.writeInt(AudioSession.CMD_SEND_RTP_HDR_EXTN);
        parcel.writeInt(extensions.size());
        for (RtpHeaderExtension item : extensions) {
            item.writeToParcel(parcel, 0);
        }
        sendRequest(mSessionId, parcel);
    }

    /**
     * Sets the media quality threshold parameters of the session to get
     * media quality notifications.
     *
     * @param threshold media quality thresholds for various quality
     *        parameters
     */
    public void setMediaQualityThreshold(final MediaQualityThreshold threshold) {
        Log.d(TAG, "setMediaQualityThreshold: " + threshold);
        Parcel parcel = Parcel.obtain();
        parcel.writeInt(AudioSession.CMD_SET_MEDIA_QUALITY_THRESHOLD);
        if (threshold != null) {
            threshold.writeToParcel(parcel, 0);
        }
        sendRequest(mSessionId, parcel);
    }
}