import Foundation

extension Content {

    private static let disallowedCharactersInIds = CharacterSet.alphanumerics.union(CharacterSet(charactersIn: "-")).inverted

    private static let disallowedCharactersInFileIds = CharacterSet.alphanumerics.union(CharacterSet(charactersIn: "-.")).inverted

    func isNewIdForTag(_ id: String) -> Bool {
        !tags.contains { $0.id == id }
    }

    func isNewIdForPage(_ id: String) -> Bool {
        !pages.contains { $0.id == id }
    }

    func isNewIdForPost(_ id: String) -> Bool {
        !posts.contains { $0.id == id }
    }

    func isValidIdForTagOrTagOrPost(_ id: String) -> Bool {
        id.rangeOfCharacter(from: Content.disallowedCharactersInIds) == nil
    }

    func isValidIdForFile(_ id: String) -> Bool {
        id.rangeOfCharacter(from: Content.disallowedCharactersInFileIds) == nil
    }
}