78 lines
2.8 KiB
Swift
78 lines
2.8 KiB
Swift
// Copyright © 2020 Metabolist. All rights reserved.
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import Combine
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import Foundation
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import Mastodon
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import ServiceLayer
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public final class CompositionViewModel: ObservableObject, Identifiable {
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public let id = Id()
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public var isPosted = false
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@Published public var text = ""
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@Published public var contentWarning = ""
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@Published public var displayContentWarning = false
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@Published public private(set) var attachmentViewModels = [CompositionAttachmentViewModel]()
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@Published public private(set) var isPostable = false
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@Published public private(set) var attachmentUpload: AttachmentUpload?
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private var cancellables = Set<AnyCancellable>()
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init() {
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$text.map { !$0.isEmpty }
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.removeDuplicates()
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.combineLatest($attachmentViewModels.map { !$0.isEmpty })
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.map { textPresent, attachmentPresent in
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textPresent || attachmentPresent
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}
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.assign(to: &$isPostable)
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}
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}
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public extension CompositionViewModel {
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typealias Id = UUID
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enum Event {
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case insertAfter(CompositionViewModel)
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case presentMediaPicker(CompositionViewModel)
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case error(Error)
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}
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func components(inReplyToId: Status.Id?, visibility: Status.Visibility) -> StatusComponents {
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StatusComponents(
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inReplyToId: inReplyToId,
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text: text,
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spoilerText: displayContentWarning ? contentWarning : "",
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mediaIds: attachmentViewModels.map(\.attachment.id),
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visibility: visibility)
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}
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func attachmentViewModel(indexPath: IndexPath) -> CompositionAttachmentViewModel {
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attachmentViewModels[indexPath.item]
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}
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}
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extension CompositionViewModel {
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func attach(itemProvider: NSItemProvider, service: IdentityService) -> AnyPublisher<Never, Error> {
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MediaProcessingService.dataAndMimeType(itemProvider: itemProvider)
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.flatMap { [weak self] data, mimeType -> AnyPublisher<Attachment, Error> in
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guard let self = self else { return Empty().eraseToAnyPublisher() }
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let progress = Progress(totalUnitCount: 1)
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DispatchQueue.main.async {
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self.attachmentUpload = AttachmentUpload(progress: progress, data: data, mimeType: mimeType)
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}
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return service.uploadAttachment(data: data, mimeType: mimeType, progress: progress)
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}
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.receive(on: DispatchQueue.main)
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.handleEvents(
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receiveOutput: { [weak self] in
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self?.attachmentViewModels.append(CompositionAttachmentViewModel(attachment: $0))
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},
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receiveCompletion: { [weak self] _ in self?.attachmentUpload = nil })
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.ignoreOutput()
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.eraseToAnyPublisher()
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}
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}
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