import Foundation

/// A tapped notification resolved against the accounts signed in on
/// this device: which account it belongs to, and the screen it opens.
nonisolated struct PushTarget: Equatable, Sendable {
    let accountID: String
    let destination: NotificationDestination

    /// Nil when no signed-in account matches — you signed out of it —
    /// or when the path names nothing the app can route to.
    init?(payload: PushPayload, accounts: [Account]) {
        guard let destination = notificationDestination(forPath: payload.path) else { return nil }
        // Run the payload's instance through the same normalisation an
        // account's did (trailing slash, default port) rather than
        // comparing raw URLs, which a server's unnormalised config can
        // make unequal even when they name the same instance.
        guard let instance = try? GitbayInstance(url: payload.instance.absoluteString) else { return nil }
        // Both sides, not just the payload's: an account stored before
        // the constructor folded the default port still holds an
        // explicit ":443". Normalising is for the comparison only —
        // rewriting what is stored would change `Account.id` and orphan
        // the Keychain token it keys.
        let match = accounts.first {
            $0.username == payload.user
                && (try? GitbayInstance(url: $0.instance.baseURL.absoluteString))?.baseURL == instance.baseURL
        }
        guard let match else { return nil }
        self.accountID = match.id
        self.destination = destination
    }
}