/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-9-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

package com.rmsl.juce;


import static android.content.pm.PackageManager.COMPONENT_ENABLED_STATE_DISABLED;
import static android.content.pm.PackageManager.COMPONENT_ENABLED_STATE_ENABLED;
import static android.content.pm.PackageManager.DONT_KILL_APP;

import android.annotation.TargetApi;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.media.midi.MidiDeviceService;
import android.media.midi.MidiReceiver;
import android.media.midi.MidiUmpDeviceService;
import android.os.Build;

import java.io.IOException;
import java.util.Collections;
import java.util.List;

public class VirtualMidiServices
{
    /** Argument is the receiver that should be sent outgoing messages.
        The return value is a newly-created receiver that will receive incoming messages.
    */
    private static native MidiReceiver addVirtualPort (MidiReceiver output, boolean isUmp);

    /** Argument is a receiver previously returned from addVirtualPort. */
    private static native void removeVirtualPort (MidiReceiver output);

    public static class VirtualPort extends MidiReceiver
    {
        @Override
        public void onSend (byte[] msg, int offset, int count, long timestamp) throws IOException
        {
            if (onSend != null)
                onSend.send (msg, offset, count, timestamp);
        }

        public MidiReceiver onSend;
    }

    public static class VirtualBytestreamService extends MidiDeviceService
    {
        @Override
        public MidiReceiver[] onGetInputPortReceivers()
        {
            return new MidiReceiver[] { port };
        }

        @Override
        public void onCreate()
        {
            super.onCreate();
            MidiReceiver[] receivers = getOutputPortReceivers();
            port.onSend = addVirtualPort (receivers != null && receivers.length > 0 ? receivers[0] : null, false);
        }

        @Override
        public void onDestroy()
        {
            removeVirtualPort (port.onSend);
            super.onDestroy();
        }

        private final VirtualPort port = new VirtualPort();
    }

    @TargetApi(Build.VERSION_CODES.VANILLA_ICE_CREAM)
    public static class VirtualUmpService extends MidiUmpDeviceService
    {
        @Override
        public List<MidiReceiver> onGetInputPortReceivers()
        {
            return Collections.singletonList (port);
        }

        @Override
        public void onCreate()
        {
            super.onCreate();
            List<MidiReceiver> receivers = getOutputPortReceivers();
            port.onSend = addVirtualPort (! receivers.isEmpty() ? receivers.getFirst() : null, true);
        }

        @Override
        public void onDestroy()
        {
            removeVirtualPort (port.onSend);
            super.onDestroy();
        }

        private final VirtualPort port = new VirtualPort();
    }

    private static void setVirtualMidiServiceEnabled (Context context, Class<?> klass, boolean x)
    {
        PackageManager pm = context.getPackageManager();

        if (pm == null)
            return;

        ComponentName componentName = new ComponentName (context, klass);

        int desiredState = x ? COMPONENT_ENABLED_STATE_ENABLED : COMPONENT_ENABLED_STATE_DISABLED;
        int actualState = pm.getComponentEnabledSetting (componentName);

        if (desiredState == actualState)
            return;

        pm.setComponentEnabledSetting (componentName, desiredState, DONT_KILL_APP);
    }

    public static void setVirtualMidiBytestreamEnabled (Context context, boolean x)
    {
        setVirtualMidiServiceEnabled (context, VirtualBytestreamService.class, x);
    }

    public static void setVirtualMidiUmpEnabled (Context context, boolean x)
    {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.VANILLA_ICE_CREAM)
            setVirtualMidiServiceEnabled (context, VirtualUmpService.class, x);
    }

    private static boolean isServiceAvailable (Context context, Class k)
    {
        PackageManager packageManager = context.getPackageManager();
        Intent intent = new Intent (context, k);
        List services = packageManager.queryIntentServices (intent, PackageManager.MATCH_DEFAULT_ONLY);

        return services != null && ! services.isEmpty();
    }

    public static boolean isVirtualBytestreamAvailable (Context context)
    {
        return isServiceAvailable (context, VirtualBytestreamService.class);
    }

    public static boolean isVirtualUmpAvailable (Context context)
    {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.VANILLA_ICE_CREAM)
            return false;

        return isServiceAvailable (context, VirtualUmpService.class);
    }
}
