audiobookshelf-app/ios/App/App/plugins/AbsAudioPlayer.swift

//
//  AbsAudioPlayer.swift
//  App
//
//  Created by Rasmus Krämer on 13.04.22.
//

import Foundation
import Capacitor

@objc(AbsAudioPlayer)
public class AbsAudioPlayer: CAPPlugin {
    override public func load() {
        NotificationCenter.default.addObserver(self, selector: #selector(sendMetadata), name: NSNotification.Name(PlayerEvents.update.rawValue), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(sendPlaybackClosedEvent), name: NSNotification.Name(PlayerEvents.closed.rawValue), object: nil)
        
        NotificationCenter.default.addObserver(self, selector: #selector(sendMetadata), name: UIApplication.didBecomeActiveNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(sendMetadata), name: UIApplication.willEnterForegroundNotification, object: nil)
    }
    
    @objc func prepareLibraryItem(_ call: CAPPluginCall) {
        let libraryItemId = call.getString("libraryItemId")
        let episodeId = call.getString("episodeId")
        let playWhenReady = call.getBool("playWhenReady", true)
        
        if libraryItemId == nil {
            NSLog("provide library item id")
            return call.resolve()
        }
        if libraryItemId!.starts(with: "local") {
            NSLog("local items are not implemnted")
            return call.resolve()
        }
        
        sendPrepareMetadataEvent(itemId: libraryItemId!, playWhenReady: playWhenReady)
        ApiClient.startPlaybackSession(libraryItemId: libraryItemId!, episodeId: episodeId) { session in
            PlayerHandler.startPlayback(session: session, playWhenReady: playWhenReady)
            
            do {
                self.sendPlaybackSession(session: try session.asDictionary())
                call.resolve(try session.asDictionary())
            } catch(let exception) {
                NSLog("failed to convert session to json")
                debugPrint(exception)
                
                call.resolve([:])
            }
            
            self.sendMetadata()
        }
    }
    @objc func closePlayback(_ call: CAPPluginCall) {
        PlayerHandler.stopPlayback()
        call.resolve()
    }
    
    @objc func getCurrentTime(_ call: CAPPluginCall) {
        call.resolve([
            "value": PlayerHandler.getCurrentTime() ?? 0,
            "bufferedTime": PlayerHandler.getCurrentTime() ?? 0,
        ])
    }
    @objc func setPlaybackSpeed(_ call: CAPPluginCall) {
        PlayerHandler.setPlaybackSpeed(speed: call.getFloat("value", 1.0))
        call.resolve()
    }
    
    @objc func playPause(_ call: CAPPluginCall) {
        PlayerHandler.playPause()
        call.resolve([ "playing": !PlayerHandler.paused() ])
    }
    @objc func playPlayer(_ call: CAPPluginCall) {
        PlayerHandler.play()
        call.resolve()
    }
    @objc func pausePlayer(_ call: CAPPluginCall) {
        PlayerHandler.pause()
        call.resolve()
    }
    
    @objc func seek(_ call: CAPPluginCall) {
        PlayerHandler.seek(amount: call.getDouble("value", 0.0))
        call.resolve()
    }
    @objc func seekForward(_ call: CAPPluginCall) {
        PlayerHandler.seekForward(amount: call.getDouble("value", 0.0))
        call.resolve()
    }
    @objc func seekBackward(_ call: CAPPluginCall) {
        PlayerHandler.seekBackward(amount: call.getDouble("value", 0.0))
        call.resolve()
    }
    
    @objc func sendMetadata() {
        self.notifyListeners("onPlayingUpdate", data: [ "value": !PlayerHandler.paused() ])
        self.notifyListeners("onMetadata", data: PlayerHandler.getMetdata())
    }
    @objc func sendPlaybackClosedEvent() {
        self.notifyListeners("onPlaybackClosed", data: [ "value": true ])
    }
    
    @objc func sendPrepareMetadataEvent(itemId: String, playWhenReady: Bool) {
        self.notifyListeners("onPrepareMedia", data: [
            "audiobookId": itemId,
            "playWhenReady": playWhenReady,
        ])
    }
    @objc func sendPlaybackSession(session: [String: Any]) {
        self.notifyListeners("onPlaybackSession", data: session)
    }
    
    /*
     IMPLEMENTED:
     
     cancelSleepTimer
     decreaseSleepTime
     increaseSleepTime
     getSleepTimerTime
     setSleepTimer
     * closePlayback
     * setPlaybackSpeed
     * seekBackward
     * seekForward
     * seek
     * playPause
     * playPlayer
     * pausePlayer
     * getCurrentTime
     
     * onPlaybackSession
     * onPrepareMedia
     
     * onPlaybackClosed
     * onPlayingUpdate
     * onMetadata
     onSleepTimerEnded
     onSleepTimerSet
     */
}