@MainActor
public protocol PrismTheme: Sendable {
    func color(_ token: ColorToken) -> Color
}

import PrismUI

@main
struct MyApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
                .prismTheme(DarkTheme())
        }
    }
}

struct OceanTheme: PrismTheme {
    func color(_ token: ColorToken) -> Color {
        switch token {
        case .brand: Color(red: 0.0, green: 0.47, blue: 0.75)
        case .background: Color(red: 0.05, green: 0.1, blue: 0.15)
        case .surface: Color(red: 0.08, green: 0.14, blue: 0.2)
        case .onBackground: .white
        case .interactive: Color(red: 0.0, green: 0.6, blue: 0.9)
        case .success: .green
        case .error: .red
        case .warning: .orange
        default: DefaultTheme().color(token)
        }
    }
}

let autoTheme = PrismAutoTheme(
    light: DefaultTheme(),
    dark: DarkTheme()
)

ContentView()
    .prismTheme(autoTheme)

@State private var themeStore = PrismThemeStore(
    themes: [DefaultTheme(), DarkTheme(), HighContrastTheme()],
    current: DefaultTheme()
)

var body: some View {
    NavigationStack {
        ContentView()
            .prismTheme(themeStore.current)
            .toolbar {
                Button("Next Theme") {
                    themeStore.cycleNext()
                }
            }
    }
}

struct ThemedCard: View {
    @Environment(\.prismTheme) private var theme

    var body: some View {
        RoundedRectangle(cornerRadius: RadiusToken.md.rawValue)
            .fill(theme.color(.surface))
            .overlay(
                Text("Hello")
                    .foregroundStyle(theme.color(.onSurface))
            )
    }
}