// BundledDumpProvider.swift — no-network last resort (P0 live chain).
//
// A REAL snapshot of the mirror dump is bundled into the app (FuelBoardDump
// dataset, refreshed before builds by scripts/refresh_bundled_dump.sh) so the
// app never demos empty and App Review always sees real data even fully
// offline. Same relay envelope, so the shared decode applies unchanged.

import UIKit

enum BundledDumpProvider {
    /// The bundled real snapshot, decoded with the shared relay decode —
    /// nil only if the asset is missing or corrupt (callers then fall back
    /// to the England-wide sample set).
    static var stations: [FuelStation]? {
        guard let asset = NSDataAsset(name: "FuelBoardDump") else { return nil }
        return try? FuelPriceProvider.decodeStations(from: asset.data)
    }

    /// The GOV.UK `data_updated` stamp from the bundled envelope (ISO 8601).
    /// Labels the offline-data banner honestly ("Offline data from 15 Aug")
    /// instead of presenting the build's snapshot as live.
    static var dataUpdatedStamp: String? {
        guard let asset = NSDataAsset(name: "FuelBoardDump"),
              let obj = try? JSONSerialization.jsonObject(with: asset.data)
                  as? [String: Any] else { return nil }
        return obj["data_updated"] as? String
    }
}