import Foundation

final class PostSettings: ObservableObject {

    /// The number of posts to show in a single page of the news feed
    @Published
    var postsPerPage: Int

    /// The maximum width of the main content
    @Published
    var contentWidth: Int

    @Published
    var swiperCssFile: FileResource?

    @Published
    var swiperJsFile: FileResource?

    @Published
    var defaultCssFile: FileResource?

    @Published
    var german: LocalizedPostSettings

    @Published
    var english: LocalizedPostSettings

    init(postsPerPage: Int,
         contentWidth: Int,
         swiperCssFile: FileResource?,
         swiperJsFile: FileResource?,
         defaultCssFile: FileResource?,
         german: LocalizedPostSettings,
         english: LocalizedPostSettings) {
        self.postsPerPage = postsPerPage
        self.contentWidth = contentWidth
        self.swiperCssFile = swiperCssFile
        self.swiperJsFile = swiperJsFile
        self.defaultCssFile = defaultCssFile
        self.german = german
        self.english = english
    }

    // MARK: Storage

    init(file: PostSettingsFile, files: [String : FileResource]) {
        self.postsPerPage = file.postsPerPage
        self.contentWidth = file.contentWidth
        self.swiperCssFile = file.swiperCssFile.map { files[$0] }
        self.swiperJsFile = file.swiperJsFile.map { files[$0] }
        self.defaultCssFile = file.defaultCssFile.map { files[$0] }
        self.german = .init(file: file.german)
        self.english = .init(file: file.english)
    }

    var file: PostSettingsFile {
        .init(postsPerPage: postsPerPage,
              contentWidth: contentWidth,
              swiperCssFile: swiperCssFile?.id,
              swiperJsFile: swiperJsFile?.id,
              defaultCssFile: defaultCssFile?.id,
              german: german.file,
              english: english.file)
    }

    func remove(_ file: FileResource) {
        if swiperJsFile == file {
            swiperJsFile = nil
        }
        if swiperCssFile == file {
            swiperCssFile = nil
        }
        if defaultCssFile == file {
            defaultCssFile = nil
        }
    }
}

extension PostSettings {

    static var `default`: PostSettings {
        .init(file: .default, files: [:])
    }
}

extension PostSettings: LocalizedItem {
    
}