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 {
    var body: some View {
        ZStack {
            LinearGradient(
                colors: [
                    Color(red: 0.09, green: 0.10, blue: 0.14),
                    Color(red: 0.02, green: 0.03, blue: 0.06)
                ],
                startPoint: .top, endPoint: .bottom
            )
            .ignoresSafeArea()

            VStack(alignment: .leading, spacing: 26) {
                // App icon + name, home-screen style
                HStack(spacing: 16) {
                    Image("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)
                        Text("Cheapest fuel near you")
                            .font(.subheadline)
                            .foregroundStyle(.white.opacity(0.65))
                    }
                }
                .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 {
        VStack(alignment: .leading, spacing: 10) {
            Text(label.uppercased())
                .font(.caption.weight(.semibold))
                .tracking(1)
                .foregroundStyle(.white.opacity(0.5))
            FuelPriceWidgetContent(entry: mockEntry(family: family), family: family, isWidget: false)
                .padding(14)
                .frame(maxWidth: .infinity, alignment: .leading)
                .background(Color(.systemBackground), in: RoundedRectangle(cornerRadius: 24, style: .continuous))
        }
    }

    /// Real stations (loaded dump), cheapest-first for the chosen fuel — the
    /// same selection the widget's own provider makes.
    private func mockEntry(family: WidgetFamily) -> FuelPriceWidgetEntryData {
        let fuel = FuelType.e10
        let all = FuelStore.loadStations()
        let selling = all.filter { $0.prices[fuel] != nil }
            .sorted { ($0.prices[fuel] ?? .infinity) < ($1.prices[fuel] ?? .infinity) }
        let location = FuelStore.loadLocation().map { Coordinate(lat: $0.lat, lng: $0.lng) }
        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()
        )
    }
}