import SwiftUI
import WidgetKit

/// Full-screen widget preview (launch arg `-widgets`): the real app icon
/// plus the REAL widget faces (Shared/FuelPriceWidgetViews.swift — the same
/// code the widget extension renders) at small + medium sizes. Used for App
/// Store screenshot captures; not reachable from the UI.
struct WidgetMockScreen: View {
    @Environment(\.colorScheme) private var colorScheme

    var body: some View {
        ZStack {
            // Real iPhone wallpaper (extracted from the iOS 26.3 sim runtime —
            // ActionButtonSelector Display.ca asset, 1320×2870 native res).
            Image("PreviewWallpaper")
                .resizable()
                .scaledToFill()
                .ignoresSafeArea()

            VStack(alignment: .leading, spacing: 26) {
                // App icon + name, home-screen style. Uses the SAME artwork
                // the app ships (AppIcon.appiconset), with the dark variant
                // when the device is in dark mode — matching iOS behaviour.
                HStack(spacing: 16) {
                    Image(colorScheme == .dark ? "AppIconPreviewDark" : "AppIconPreview")
                        .resizable()
                        .frame(width: 76, height: 76)
                        .clipShape(RoundedRectangle(cornerRadius: 17, style: .continuous))
                    VStack(alignment: .leading, spacing: 3) {
                        Text("FuelBoard")
                            .font(.title2.bold())
                            .foregroundStyle(.white)
                            .shadow(radius: 2, y: 1)
                        Text("Cheapest fuel near you")
                            .font(.subheadline)
                            .foregroundStyle(.white.opacity(0.9))
                            .shadow(radius: 2, y: 1)
                    }
                }
                .padding(.top, 8)

                widgetCard(.systemSmall, label: "Small widget")
                widgetCard(.systemMedium, label: "Medium widget")

                Spacer(minLength: 0)
            }
            .padding(30)
        }
    }

    private func widgetCard(_ family: WidgetFamily, label: String) -> some View {
        // Real widget proportions: system small content is 158×158pt,
        // medium 338×158pt (card adds the 14pt padding each side).
        let contentW: CGFloat = family == .systemSmall ? 158 : 338
        let cardW: CGFloat = contentW + 28
        let cardH: CGFloat = contentW + 28
        return VStack(alignment: .leading, spacing: 10) {
            Text(label.uppercased())
                .font(.caption.weight(.semibold))
                .tracking(1)
                .foregroundStyle(.secondary)
            FuelPriceWidgetContent(entry: mockEntry(family: family), family: family, isWidget: false)
                .padding(14)
                .frame(width: cardW, height: cardH, alignment: .leading)
                .background(Color(.systemBackground), in: RoundedRectangle(cornerRadius: 24, style: .continuous))
        }
    }

    /// Real stations (loaded dump) for the widget's DEFAULT configuration —
    /// Unleaded / Cheapest / 5 miles — with the SAME radius test the widget's
    /// provider applies. Without it this preview happily listed the UK-wide
    /// cheapest (Banbridge, 184 mi away) under "Cheapest fuel near you", which
    /// is not what the widget ever shows.
    private func mockEntry(family: WidgetFamily) -> FuelPriceWidgetEntryData {
        let fuel = FuelType.e10
        let location = FuelStore.loadLocation().map { Coordinate(lat: $0.lat, lng: $0.lng) }
        // 5 miles — the widget config's default Distance. WidgetDistance itself
        // lives in the widget target, so the preview mirrors its default here.
        let radiusKM = 5 * 1.60934
        let all = FuelStore.loadStations()
        let selling = all.filter { station in
            guard station.prices[fuel] != nil else { return false }
            guard let location else { return true }
            return FuelStore.isWithinDisplayRadius(station: station, radiusKM: radiusKM,
                                                   userLat: location.lat, userLng: location.lng)
        }
        .sorted { ($0.prices[fuel] ?? .infinity) < ($1.prices[fuel] ?? .infinity) }
        let count = family == .systemSmall ? 1 : 3
        return FuelPriceWidgetEntryData(
            date: Date(),
            stations: Array(selling.prefix(count)),
            fuel: fuel,
            sort: .cheapest,
            isFavourites: false,
            location: location,
            locationSource: location != nil ? "live" : "none",
            unit: FuelStore.loadDistanceUnit()
        )
    }
}