import Foundation

final class LocalizedTag: ObservableObject {

    unowned let content: Content

    @Published
    var urlComponent: String

    /// A custom name, different from the tag id
    @Published
    var name: String

    @Published
    var subtitle: String?

    @Published
    var description: String?

    /// The image id of the thumbnail
    @Published
    var linkPreviewImage: FileResource?

    @Published
    var linkPreviewTitle: String?

    /// The original url in the previous site layout
    let originalUrl: String?

    init(content: Content,
         urlComponent: String,
         name: String,
         subtitle: String? = nil,
         description: String? = nil,
         thumbnail: FileResource? = nil,
         linkPreviewTitle: String? = nil,
         originalUrl: String? = nil) {
        self.content = content
        self.urlComponent = urlComponent
        self.name = name
        self.subtitle = subtitle
        self.description = description
        self.linkPreviewImage = thumbnail
        self.linkPreviewTitle = linkPreviewTitle
        self.originalUrl = originalUrl
    }

    func isValid(urlComponent: String) -> Bool {
        content.isValidIdForTagOrPageOrPost(urlComponent) &&
        !content.containsTag(withUrlComponent: urlComponent)
    }

    /// The title to display when considering multiple items of this tag
    var title: String {
        linkPreviewTitle ?? name
    }
}

extension LocalizedTag: LinkPreviewItem {

    var linkPreviewDescription: String? {
        description
    }
}