//
//  MediaItemProperty.swift
//  SwiftAudio
//
//  Created by Jørgen Henrichsen on 15/03/2018.
//

import Foundation
import MediaPlayer


/**
 Enum representing MPMediaItemProperties.
 Docs for each property is taken from [Apple docs](https://developer.apple.com/documentation/mediaplayer/mpmediaitem/general_media_item_property_keys)
 */
public enum MediaItemProperty: NowPlayingInfoKeyValue {
    
    /**
     The performing artist(s) for a media item—which may vary from the primary artist for the album that a media item belongs to.
     
     For example, if the album artist is “Joseph Fable,” the artist for one of the songs in the album may be “Joseph Fable featuring Thomas Smithson”. Value is an NSString object.
     */
    case artist(String?)


    /**
     The title (or name) of the media item.
     
     This property is unrelated to the MPMediaItemPropertyAlbumTitle property. Value is an NSString object.
     */
    case title(String?)
    
    /**
     The title of an album.
     
     This property contains the album title, such as “Live On Mars”, as opposed to the title of an individual song on the album, such as “Crater Dance (radio edit)” (which you specify using the MPMediaItemPropertyTitle property). Value is an NSString object.
     */
    case albumTitle(String?)

    /**
     The playback duration of the media item.
     Value is an NSNumber object representing a duration in seconds as an TimeInterval.
     */
    case duration(TimeInterval?)
        

    /**
     The artwork image for the media item.
     */
    case artwork(MPMediaItemArtwork?)

    public func getKey() -> String {
        switch self {
            
        case .artist(_):
            return MPMediaItemPropertyArtist
            
        case .title(_):
            return MPMediaItemPropertyTitle
            
        case .albumTitle(_):
            return MPMediaItemPropertyAlbumTitle
            
        case .duration(_):
            return MPMediaItemPropertyPlaybackDuration
            
        case .artwork(_):
            return MPMediaItemPropertyArtwork

        }
    }

    public func getValue() -> Any? {
        switch self {
            
        case .artist(let artist):
            return artist
            
        case .title(let title):
            return title
            
        case .albumTitle(let title):
            return title
            
        case .duration(let duration):
            return duration != nil ? NSNumber(floatLiteral: duration!) : nil
            
        case .artwork(let artwork):
            return artwork

        }
    }

}