import ActivityKit
import BackgroundTasks
import SwiftUI

@main
struct FuelBoardApp: App {
    init() {
        WatchSyncManager.shared.activate()
        #if DEBUG
        // QA hook (Debug builds only): `-qaLiveActivity e10|e5|diesel` starts a
        // Live Activity with a long station name so the Lock Screen / island
        // layout can be rendered in the Simulator for visual QA.
        let args = ProcessInfo.processInfo.arguments
        if let idx = args.firstIndex(of: "-qaLiveActivity"),
           args.indices.contains(idx + 1),
           let fuel = FuelType(rawValue: args[idx + 1]) {
            startQALiveActivity(fuel: fuel)
        }
        #endif
    }

    var body: some Scene {
        WindowGroup {
            ContentView()
                .onOpenURL(perform: handleOpenURL)
                .onReceive(NotificationCenter.default.publisher(for: .fuelBoardWatchRefreshRequested)) { _ in
                    WatchSyncManager.shared.pushSnapshot()
                }
        }
        .backgroundTask(.appRefresh(SmartDataRefreshScheduler.taskIdentifier)) {
            await SmartDataRefreshCoordinator.runBackgroundProbe()
        }
    }

    #if DEBUG
    private func startQALiveActivity(fuel: FuelType) {
        let state = FuelBoardLiveActivityAttributes.ContentState(
            fuel: fuel,
            stationID: "qa-phoenix",
            stationName: "Phoenix Filling Stations",
            brand: "Phoenix",
            pricePence: 1499,
            priceDisplayStyle: FuelStore.loadPriceDisplayStyle(),
            distanceKM: 8.0,
            lat: 51.5,
            lng: -0.12,
            updatedAt: Date()
        )
        let attrs = FuelBoardLiveActivityAttributes()
        do {
            let activity = try Activity.request(
                attributes: attrs,
                content: .init(state: state, staleDate: nil),
                pushType: nil
            )
            print("QA-LIVE-ACTIVITY STARTED id=\(activity.id)")
        } catch {
            print("QA-LIVE-ACTIVITY FAILED: \(error)")
        }
    }
    #endif

    /// 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.
    /// A `fuelboard://station?stationID=…&lat=…&lng=…&name=…` link (from a
    /// widget or Live Activity tap when Settings → Tap station = More info)
    /// posts a notification that ContentView observes to present the detail
    /// sheet (falling back to the map sheet when the station has left
    /// the cache).
    private func handleOpenURL(_ url: URL) {
        guard let components = URLComponents(url: url, resolvingAgainstBaseURL: false)
        else { return }

        if components.scheme == "fuelboard",
           components.host == "station" {
            let items = components.queryItems ?? []
            var userInfo: [String: Any] = [:]
            if let id = items.first(where: { $0.name == "stationID" })?.value {
                userInfo["stationID"] = id
            }
            if let lat = items.first(where: { $0.name == "lat" })?.value.flatMap(Double.init) {
                userInfo["stationLat"] = lat
            }
            if let lng = items.first(where: { $0.name == "lng" })?.value.flatMap(Double.init) {
                userInfo["stationLng"] = lng
            }
            if let name = items.first(where: { $0.name == "name" })?.value {
                userInfo["stationName"] = name
            }
            NotificationCenter.default.post(
                name: .fuelBoardShowStationDetail,
                object: nil,
                userInfo: userInfo
            )
            return
        }

        guard 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)
    }
}