import Foundation

final class Post: Item {

    @Published
    var isDraft: Bool

    @Published
    var createdDate: Date

    @Published
    var startDate: Date

    @Published
    var hasEndDate: Bool

    @Published
    var endDate: Date

    @Published
    var tags: [Tag]

    @Published
    var german: LocalizedPost

    @Published
    var english: LocalizedPost

    /// The page linked to by this post
    @Published
    var linkedPage: Page?

    init(content: Content,
         id: String,
         isDraft: Bool,
         createdDate: Date,
         startDate: Date,
         endDate: Date?,
         tags: [Tag],
         german: LocalizedPost,
         english: LocalizedPost,
         linkedPage: Page? = nil) {
        self.isDraft = isDraft
        self.createdDate = createdDate
        self.startDate = startDate
        self.hasEndDate = endDate != nil
        self.endDate = endDate ?? startDate
        self.tags = tags
        self.german = german
        self.english = english
        self.linkedPage = linkedPage
        super.init(content: content, id: id)
    }

    func localized(in language: ContentLanguage) -> LocalizedPost {
        switch language {
        case .english: return english
        case .german: return german
        }
    }

    func isValid(id: String) -> Bool {
        !id.isEmpty &&
        content.isValidIdForTagOrPageOrPost(id) &&
        content.isNewIdForPost(id)
    }

    @discardableResult
    func update(id newId: String) -> Bool {
        guard content.storage.move(post: id, to: newId) else {
            print("Failed to move file of post \(id)")
            return false
        }
        id = newId
        return true
    }
}

extension Post: DateItem {

}