/*
 * Copyright 2019 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.plausiblesoftware.drumthumper

import android.content.Context
import android.media.AudioDeviceCallback
import android.media.AudioDeviceInfo
import android.media.AudioManager
import android.os.Bundle
import android.util.Log
import android.view.View
import android.widget.Button
import android.widget.LinearLayout
import android.widget.SeekBar
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import java.time.LocalDateTime
import java.util.Timer
import kotlin.concurrent.schedule

class DrumThumperActivity : AppCompatActivity(),
        TriggerPad.DrumPadTriggerListener,
        SeekBar.OnSeekBarChangeListener,
        View.OnClickListener {
    private val TAG = "DrumThumperActivity"

    private var mAudioMgr: AudioManager? = null

    private var mDrumPlayer = DrumPlayer()

    private val mUseDeviceChangeFallback = false
    private val mSwitchTimerMs = 500L

    private var mDevicesInitialized = false

    private var mDeviceListener: DeviceListener = DeviceListener()

    private var mMixControlsShowing = false

    init {
        // Load the library containing the a native code including the JNI  functions
        System.loadLibrary("drumthumper")
    }

    inner class DeviceListener: AudioDeviceCallback() {
        private fun logDevices(label: String, devices: Array<AudioDeviceInfo> ) {
            Log.i(TAG, label + " " + devices.size)
            for(device in devices) {
                Log.i(TAG, "  " + device.getProductName().toString()
                    + " type:" + device.getType()
                    + " source:" + device.isSource()
                    + " sink:" + device.isSink())
            }
        }

        override fun onAudioDevicesAdded(addedDevices: Array<AudioDeviceInfo> ) {
            // Note: This will get called when the callback is installed.
            if (mDevicesInitialized) {
                logDevices("onAudioDevicesAdded", addedDevices)
                // This is not the initial callback, so devices have changed
                Toast.makeText(applicationContext, "Added Device", Toast.LENGTH_LONG).show()
                resetOutput()
            }
            mDevicesInitialized = true
        }

        override fun onAudioDevicesRemoved(removedDevices: Array<AudioDeviceInfo> ) {
            logDevices("onAudioDevicesRemoved", removedDevices)
            Toast.makeText(applicationContext, "Removed Device", Toast.LENGTH_LONG).show()
            resetOutput()
        }

        private fun resetOutput() {
            Log.i(TAG, "resetOutput() time:" + LocalDateTime.now() + " native reset:" + mDrumPlayer.getOutputReset())
            if (mDrumPlayer.getOutputReset()) {
                // the (native) stream has been reset by the onErrorAfterClose() callback
                mDrumPlayer.clearOutputReset()
            } else {
                // give the (native) stream a chance to close it.
                val timer = Timer("stream restart timer time:" + LocalDateTime.now(),
                        false)
                // schedule a single event
                timer.schedule(mSwitchTimerMs) {
                    if (!mDrumPlayer.getOutputReset()) {
                        // still didn't get reset, so lets do it ourselves
                        Log.i(TAG, "restartStream() time:" + LocalDateTime.now())
                        mDrumPlayer.restartStream()
                    }
                }
            }
        }
    }

    //
    // UI Helpers
    //
    val GAIN_FACTOR = 100.0f
    val MAX_PAN_POSITION = 200.0f
    val HALF_PAN_POSITION = MAX_PAN_POSITION / 2.0f

    private fun gainPosToGainVal(pos: Int) : Float {
        // map 0 -> 200 to 0.0f -> 2.0f
        return pos.toFloat() / GAIN_FACTOR
    }

    private fun gainValToGainPos(value: Float) : Int {
        return (value * GAIN_FACTOR).toInt()
    }

    private fun panPosToPanVal(pos: Int) : Float {
        // map 0 -> 200 to -1.0f -> 1..0f
        return (pos.toFloat() - HALF_PAN_POSITION) / HALF_PAN_POSITION
    }

    private fun panValToPanPos(value: Float) : Int {
        // map -1.0f -> 1.0f to 0 -> 200
        return ((value * HALF_PAN_POSITION) + HALF_PAN_POSITION).toInt()
    }

    private fun showMixControls(show : Boolean) {
        mMixControlsShowing = show
        val showFlag = if (mMixControlsShowing) View.VISIBLE else View.GONE
        findViewById<LinearLayout>(R.id.kickMixControls).setVisibility(showFlag)
        findViewById<LinearLayout>(R.id.snareMixControls).setVisibility(showFlag)
        findViewById<LinearLayout>(R.id.hihatOpenMixControls).setVisibility(showFlag)
        findViewById<LinearLayout>(R.id.hihatClosedMixControls).setVisibility(showFlag)
        findViewById<LinearLayout>(R.id.midTomMixControls).setVisibility(showFlag)
        findViewById<LinearLayout>(R.id.lowTomMixControls).setVisibility(showFlag)
        findViewById<LinearLayout>(R.id.rideMixControls).setVisibility(showFlag)
        findViewById<LinearLayout>(R.id.crashMixControls).setVisibility(showFlag)

        findViewById<Button>(R.id.mixCtrlBtn).text =
                if (mMixControlsShowing) "Hide Mix Controls" else "Show Mix Controls"
    }

    private fun connectMixSliders(panSliderId : Int, gainSliderId : Int, drumIndex : Int) {
        val panSeekbar = findViewById<SeekBar>(panSliderId)
        panSeekbar.setOnSeekBarChangeListener(this)
        panSeekbar.progress = panValToPanPos(mDrumPlayer.getPan(drumIndex))

        val gainSeekbar = findViewById<SeekBar>(gainSliderId)
        gainSeekbar.setOnSeekBarChangeListener(this)
        gainSeekbar.progress = gainValToGainPos(mDrumPlayer.getGain(drumIndex))
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        mAudioMgr = getSystemService(Context.AUDIO_SERVICE) as AudioManager

    }

    override fun onStart() {
        super.onStart()

        mDrumPlayer.setupAudioStream()

        val allAssetsValid = mDrumPlayer.loadWavAssets(getAssets())

        if (!allAssetsValid) {
            // show toast
            val toast = Toast.makeText(this,
                    "One or more audio assets has an incorrect format and may not play correctly",
                    Toast.LENGTH_LONG)
            toast.show()
        }
        mDrumPlayer.startAudioStream()

        if (mUseDeviceChangeFallback) {
            mAudioMgr!!.registerAudioDeviceCallback(mDeviceListener, null)
        }
    }

    override fun onResume() {
        super.onResume()

        // UI
        setContentView(R.layout.drumthumper_activity)

        // "Kick" drum
        findViewById<TriggerPad>(R.id.kickPad).addListener(this)
        connectMixSliders(R.id.kickPan, R.id.kickGain, DrumPlayer.BASSDRUM)

        // Snare drum
        findViewById<TriggerPad>(R.id.snarePad).addListener(this)
        connectMixSliders(R.id.snarePan, R.id.snareGain, DrumPlayer.SNAREDRUM)

        // Mid tom
        findViewById<TriggerPad>(R.id.midTomPad).addListener(this)
        connectMixSliders(R.id.midTomPan, R.id.midTomGain, DrumPlayer.MIDTOM)

        // Low tom
        findViewById<TriggerPad>(R.id.lowTomPad).addListener(this)
        connectMixSliders(R.id.lowTomPan, R.id.lowTomGain, DrumPlayer.LOWTOM)

        // Open hihat
        findViewById<TriggerPad>(R.id.hihatOpenPad).addListener(this)
        connectMixSliders(R.id.hihatOpenPan, R.id.hihatOpenGain, DrumPlayer.HIHATOPEN)

        // Closed hihat
        findViewById<TriggerPad>(R.id.hihatClosedPad).addListener(this)
        connectMixSliders(R.id.hihatClosedPan, R.id.hihatClosedGain, DrumPlayer.HIHATCLOSED)

        // Ride cymbal
        findViewById<TriggerPad>(R.id.ridePad).addListener(this)
        connectMixSliders(R.id.ridePan, R.id.rideGain, DrumPlayer.RIDECYMBAL)

        // Crash cymbal
        findViewById<TriggerPad>(R.id.crashPad).addListener(this)
        connectMixSliders(R.id.crashPan, R.id.crashGain, DrumPlayer.CRASHCYMBAL)

        findViewById<Button>(R.id.mixCtrlBtn).setOnClickListener(this)
        showMixControls(false)
    }

    override fun onStop() {
        if (mUseDeviceChangeFallback) {
            mAudioMgr!!.unregisterAudioDeviceCallback(mDeviceListener)
        }

        mDrumPlayer.teardownAudioStream()

        mDrumPlayer.unloadWavAssets()

        super.onStop()
    }

    //
    // DrumPad.DrumPadTriggerListener
    //
    override fun triggerDown(pad: TriggerPad) {
        // trigger the sound based on the pad
        when (pad.id) {
            R.id.kickPad -> mDrumPlayer.trigger(DrumPlayer.BASSDRUM)
            R.id.snarePad -> mDrumPlayer.trigger(DrumPlayer.SNAREDRUM)
            R.id.midTomPad -> mDrumPlayer.trigger(DrumPlayer.MIDTOM)
            R.id.lowTomPad -> mDrumPlayer.trigger(DrumPlayer.LOWTOM)
            R.id.hihatOpenPad -> {
                mDrumPlayer.trigger(DrumPlayer.HIHATOPEN)
                // For a real drum set, hi-hat can play either the open or the closed sound at any
                // given time.
                mDrumPlayer.stopTrigger(DrumPlayer.HIHATCLOSED)
            }
            R.id.hihatClosedPad -> {
                mDrumPlayer.trigger(DrumPlayer.HIHATCLOSED)
                // For a real drum set, hi-hat can play either the open or the closed sound at any
                // given time.
                mDrumPlayer.stopTrigger(DrumPlayer.HIHATOPEN)
            }
            R.id.ridePad -> mDrumPlayer.trigger(DrumPlayer.RIDECYMBAL)
            R.id.crashPad -> mDrumPlayer.trigger(DrumPlayer.CRASHCYMBAL)
        }
    }

    override fun triggerUp(pad: TriggerPad) {
        // NOP
    }

    //
    // SeekBar.OnSeekBarChangeListener
    //
    override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
        when (seekBar!!.id) {
            // BASSDRUM
            R.id.kickGain -> mDrumPlayer.setGain(DrumPlayer.BASSDRUM, gainPosToGainVal(progress))
            R.id.kickPan -> mDrumPlayer.setPan(DrumPlayer.BASSDRUM, panPosToPanVal(progress))

            // SNAREDRUM
            R.id.snareGain -> mDrumPlayer.setGain(DrumPlayer.SNAREDRUM, gainPosToGainVal(progress))
            R.id.snarePan -> mDrumPlayer.setPan(DrumPlayer.SNAREDRUM, panPosToPanVal(progress))

            // MIDTOM
            R.id.midTomGain -> mDrumPlayer.setGain(DrumPlayer.MIDTOM, gainPosToGainVal(progress))
            R.id.midTomPan -> mDrumPlayer.setPan(DrumPlayer.MIDTOM, panPosToPanVal(progress))

            // LOWTOM
            R.id.lowTomGain -> mDrumPlayer.setGain(DrumPlayer.LOWTOM, gainPosToGainVal(progress))
            R.id.lowTomPan -> mDrumPlayer.setPan(DrumPlayer.LOWTOM, panPosToPanVal(progress))

            // HIHATOPEN
            R.id.hihatOpenGain -> mDrumPlayer.setGain(DrumPlayer.HIHATOPEN, gainPosToGainVal(progress))
            R.id.hihatOpenPan -> mDrumPlayer.setPan(DrumPlayer.HIHATOPEN, panPosToPanVal(progress))

            // HIHATCLOSED
            R.id.hihatClosedGain -> mDrumPlayer.setGain(DrumPlayer.HIHATCLOSED, gainPosToGainVal(progress))
            R.id.hihatClosedPan -> mDrumPlayer.setPan(DrumPlayer.HIHATCLOSED, panPosToPanVal(progress))

            // RIDECYMBAL
            R.id.rideGain -> mDrumPlayer.setGain(DrumPlayer.RIDECYMBAL, gainPosToGainVal(progress))
            R.id.ridePan -> mDrumPlayer.setPan(DrumPlayer.RIDECYMBAL, panPosToPanVal(progress))

            // CRASHCYMBAL
            R.id.crashGain -> mDrumPlayer.setGain(DrumPlayer.CRASHCYMBAL, gainPosToGainVal(progress))
            R.id.crashPan -> mDrumPlayer.setPan(DrumPlayer.CRASHCYMBAL, panPosToPanVal(progress))
        }
    }

    override fun onStartTrackingTouch(seekBar: SeekBar?) {
        // NOP
    }

    override fun onStopTrackingTouch(seekBar: SeekBar?) {
        // NOP
    }

    override fun onClick(v: View?) {
        showMixControls(!mMixControlsShowing)
    }

}
