import SwiftUI

@main
struct FuelBoardApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
                .onOpenURL(perform: handleOpenURL)
        }
    }

    /// Handles deep links that end up in the app. Widget taps arrive here in
    /// two cases:
    ///   - legacy/cached widget timelines using the `fuelboard://` relay, or
    ///   - the Home Screen delivering a `maps://` URL to the containing app
    ///     instead of opening Maps directly (the system's choice on iOS).
    /// Either way we forward to the native Apple Maps directions URL. The
    /// `http://maps.apple.com` form is also handled, from very old timelines.
    /// In CarPlay the widget uses the same `maps://` URL, which routes to
    /// Apple Maps without ever launching this app.
    private func handleOpenURL(_ url: URL) {
        guard let components = URLComponents(url: url, resolvingAgainstBaseURL: false),
              let items = components.queryItems
        else { return }

        // Preferred: maps://?daddr=lat,lng&t=d (also covers http://maps.apple.com).
        if let daddr = items.first(where: { $0.name == "daddr" })?.value {
            openMaps(daddr: daddr)
            return
        }

        // Legacy relay: fuelboard://directions?lat=..&lng=..
        if let lat = items.first(where: { $0.name == "lat" })?.value.flatMap(Double.init),
           let lng = items.first(where: { $0.name == "lng" })?.value.flatMap(Double.init) {
            openMaps(daddr: "\(lat),\(lng)")
        }
    }

    private func openMaps(daddr: String) {
        guard let mapsURL = URL(string: "maps://?daddr=\(daddr)&t=d") else { return }
        UIApplication.shared.open(mapsURL)
    }
}