//
//  SongItem.swift
//  TagTunes
//
//  Created by Kim Wittenburg on 30.05.15.
//  Copyright (c) 2015 Kim Wittenburg. All rights reserved.
//

import SearchAPI

/// Represents a `Song` from the Search API.
public class SongItem: TagTunesEntityItem {
    
    /// Returns the `entity` as a `Song`.
    public var song: Song {
        return entity as! Song
    }

    public var album: Album {
        return parentItem?.entity as! Album
    }

    override public var saved: Bool {
        let components = NSCalendar.currentCalendar().components(.Year, fromDate: song.releaseDate)
        for track in associatedTracks {
            let trackName = Preferences.sharedPreferences.useCensoredNames ? song.censoredName : song.name
            let albumName = Preferences.sharedPreferences.useCensoredNames ? album.censoredName : album.name
            let options = Preferences.sharedPreferences.caseSensitive ? [] : NSStringCompareOptions.CaseInsensitiveSearch
            if let name = track.name where name.compare(trackName, options: options, range: nil, locale: nil) != .OrderedSame {
                return false
            }
            if let album = track.album where album.compare(albumName, options: options, range: nil, locale: nil) != .OrderedSame {
                return false
            }
            guard track.artist == song.artist.name && track.year == components.year && track.trackNumber == song.trackNumber && track.trackCount == song.trackCountOnDisc && track.discNumber == song.discNumber && track.discCount == song.discCount && track.genre == song.primaryGenre && track.albumArtist == album.artist.name && track.composer == "" else {
                return false
            }
        }
        return true
    }

    public override func valueForTag(tag: Tag) throws -> AnyObject! {
        let censoredNames = Preferences.sharedPreferences.useCensoredNames
        switch tag {
        case .Name: return censoredNames ? song.censoredName : song.name
        case .Artist: return censoredNames ? song.artist.censoredName : song.artist.name
        case .Year:
            let components = NSCalendar.currentCalendar().components(.Year, fromDate: song.releaseDate)
            return components.year
        case .TrackNumber: return song.trackNumber
        case .TrackCount: return song.trackCountOnDisc
        case .DiscNumber: return song.discNumber
        case .DiscCount: return song.discCount
        case .Genre: return song.primaryGenre
        case .AlbumName: return censoredNames ? album.censoredName : album.name
        case .AlbumArtist: return album.artist.name
        case .Compilation: return album.compilation
        case .ReleaseDate: return song.releaseDate
            // TODO: Artwork download error!
        case .Artwork: return album.artwork.optimalArtworkImageForSize(CGFloat.max)
        case .SortName,
        .SortArtist,
        .SortAlbumName,
        .SortAlbumArtist,
        .Composer,
        .SortComposer,
        .Comment: return nil
        }
    }

}