import Foundation

enum RosterSubsriptionType: String {
    case both
    case from
    case none
    case remove
    case to

    var isFrom: Bool {
        switch self {
        case .from, .both:
            return true

        case .none, .to, .remove:
            return false
        }
    }

    var isTo: Bool {
        switch self {
        case .to, .both:
            return true

        case .none, .from, .remove:
            return false
        }
    }
}

// Roster is a "transparent" structure
// which is just wrap xml item around
struct RosterItem: Identifiable, Equatable {
    let owner: String
    let wrapped: XMLElement

    init?(wrap: XMLElement, owner: JID) {
        guard
            wrap.name == "item",
            wrap.attributes.keys.contains("jid"),
            wrap.xmlns == "jabber:iq:roster"
        else { return nil }
        self.owner = owner.bare
        wrapped = wrap
    }

    var id: String {
        "\(owner)|\(jid?.bare ?? "???")"
    }

    var jid: JID? {
        guard let jidStr = wrapped.attributes["jid"] else { return nil }
        return try? JID(jidStr)
    }

    var name: String? {
        wrapped.name
    }

    var subsription: RosterSubsriptionType {
        let str = wrapped.attributes["subscription"] ?? "none"
        return RosterSubsriptionType(rawValue: str) ?? .none
    }

    static func == (_ rhs: RosterItem, _ lhs: RosterItem) -> Bool {
        rhs.id == lhs.id && rhs.wrapped == lhs.wrapped
    }
}

// TODO: Add groups and annotattions!