vlc-ios/SharedSources/MediaLibraryModel/ArtistModel.swift

/*****************************************************************************
 * ArtistModel.swift
 *
 * Copyright © 2018 VLC authors and VideoLAN
 * Copyright © 2018 Videolabs
 *
 * Authors: Soomin Lee <bubu@mikan.io>
 *
 * Refer to the COPYING file of the official project for license.
 *****************************************************************************/

class ArtistModel: MLBaseModel {
    typealias MLType = VLCMLArtist

    var sortModel = SortModel([.alpha])

    var updateView: (() -> Void)?

    var files = [VLCMLArtist]()

    var cellType: BaseCollectionViewCell.Type { return ArtistCollectionViewCell.self }

    var medialibrary: MediaLibraryService

    var indicatorName: String = NSLocalizedString("ARTISTS", comment: "")

    required init(medialibrary: MediaLibraryService) {
        self.medialibrary = medialibrary
        medialibrary.addObserver(self)
        files = medialibrary.artists()
    }

    func append(_ item: VLCMLArtist) {
        files.append(item)
    }

    func delete(_ items: [VLCMLObject]) {
        preconditionFailure("ArtistModel: Cannot delete artist")
    }
}
// MARK: - Edit
extension ArtistModel: EditableMLModel {
    func editCellType() -> BaseCollectionViewCell.Type {
        return MediaEditCell.self
    }
}

// MARK: - Sort

extension ArtistModel {
    func sort(by criteria: VLCMLSortingCriteria) {
        files = medialibrary.artists(sortingCriteria: criteria)
        sortModel.currentSort = criteria
        updateView?()
    }
}

extension ArtistModel: MediaLibraryObserver {
    func medialibrary(_ medialibrary: MediaLibraryService, didAddArtists artists: [VLCMLArtist]) {
        artists.forEach({ append($0) })
        updateView?()
    }
}