import Foundation
import SwiftUI

final class LocalizedPost: ObservableObject {

    unowned let content: Content

    @Published
    var title: String?

    @Published
    var text: String

    @Published
    var lastModified: Date?

    @Published
    var images: [FileResource]

    /// The text to show for the link to the `linkedPage`
    @Published
    var pageLinkText: String?

    @Published
    var linkPreviewImage: FileResource?

    @Published
    var linkPreviewTitle: String?

    @Published
    var linkPreviewDescription: String?

    init(content: Content,
         title: String? = nil,
         text: String,
         lastModified: Date? = nil,
         images: [FileResource] = [],
         pageLinkText: String? = nil,
         linkPreviewImage: FileResource? = nil,
         linkPreviewTitle: String? = nil,
         linkPreviewDescription: String? = nil) {
        self.content = content
        self.title = title
        self.text = text
        self.lastModified = lastModified
        self.images = images
        self.pageLinkText = pageLinkText
        self.linkPreviewImage = linkPreviewImage
        self.linkPreviewTitle = linkPreviewTitle
        self.linkPreviewDescription = linkPreviewDescription
    }

    init(content: Content, file: LocalizedPostFile, images: [String : FileResource]) {
        self.content = content
        self.title = file.title
        self.text = file.content
        self.lastModified = file.lastModifiedDate
        self.images = file.images.compactMap { images[$0] }
        self.pageLinkText = file.pageLinkText
        self.linkPreviewImage = file.linkPreviewImage.map { images[$0] }
        self.linkPreviewTitle = file.linkPreviewTitle
        self.linkPreviewDescription = file.linkPreviewDescription
    }

    var postFile: LocalizedPostFile {
        .init(images: images.map { $0.id },
              title: title,
              content: text,
              lastModifiedDate: lastModified,
              pageLinkText: pageLinkText,
              linkPreviewImage: linkPreviewImage?.id,
              linkPreviewTitle: linkPreviewTitle,
              linkPreviewDescription: linkPreviewDescription)
    }

    func contains(_ string: String) -> Bool {
        if let title, title.contains(string) {
            return true
        }
        return text.contains(string)
    }

    func remove(_ file: FileResource) {
        if images.contains(file) {
            images.remove(file)
        }
        remove(linkPreviewImage: file)
    }
}

extension LocalizedPost: LinkPreviewItem {

}