import SwiftUI

#if os(macOS)
import AppKit
#elseif canImport(UIKit)
import UIKit
#endif

public enum IdP {
    public static let tint = Color("IdPTint")
    public static let cardRadius: CGFloat = 12
    public static let controlRadius: CGFloat = 8
    public static let badgeRadius: CGFloat = 999

    static func horizontalPadding(compact: Bool) -> CGFloat {
        compact ? 16 : 24
    }

    static func verticalPadding(compact: Bool) -> CGFloat {
        compact ? 16 : 24
    }
}

private enum ShadcnHex {
    // Light
    static let bg = Color(red: 1, green: 1, blue: 1)
    static let fg = Color(red: 0.039, green: 0.039, blue: 0.043)
    static let muted = Color(red: 0.957, green: 0.957, blue: 0.961)
    static let mutedFg = Color(red: 0.443, green: 0.443, blue: 0.478)
    static let border = Color(red: 0.894, green: 0.894, blue: 0.906)
    static let card = Color(red: 1, green: 1, blue: 1)
    static let primary = Color(red: 0.094, green: 0.094, blue: 0.106)
    static let primaryFg = Color(red: 0.980, green: 0.980, blue: 0.980)
    static let accentSoft = Color(red: 0.961, green: 0.953, blue: 1.0)
    static let destructive = Color(red: 0.937, green: 0.267, blue: 0.267)
    static let ok = Color(red: 0.086, green: 0.639, blue: 0.290)
    static let warn = Color(red: 0.918, green: 0.702, blue: 0.031)

    // Dark
    static let bgDark = Color(red: 0.035, green: 0.035, blue: 0.043)
    static let fgDark = Color(red: 0.980, green: 0.980, blue: 0.980)
    static let mutedDark = Color(red: 0.094, green: 0.094, blue: 0.106)
    static let mutedFgDark = Color(red: 0.631, green: 0.631, blue: 0.667)
    static let borderDark = Color(red: 0.153, green: 0.153, blue: 0.165)
    static let cardDark = Color(red: 0.047, green: 0.047, blue: 0.059)
    static let primaryDark = Color(red: 0.980, green: 0.980, blue: 0.980)
    static let primaryFgDark = Color(red: 0.094, green: 0.094, blue: 0.106)
    static let accentSoftDark = Color(red: 0.102, green: 0.086, blue: 0.180)
    static let destructiveDark = Color(red: 0.498, green: 0.114, blue: 0.114)
}

private extension Color {
    static func idpAdaptive(light: Color, dark: Color) -> Color {
        #if os(macOS)
        Color(nsColor: NSColor(name: nil) { appearance in
            let matched = appearance.bestMatch(from: [.darkAqua, .vibrantDark, .aqua, .vibrantLight])
            let isDark = matched == .darkAqua || matched == .vibrantDark
            return NSColor(isDark ? dark : light)
        })
        #elseif canImport(UIKit) && !os(watchOS)
        Color(uiColor: UIColor { traits in
            UIColor(traits.userInterfaceStyle == .dark ? dark : light)
        })
        #elseif os(watchOS)
        dark
        #else
        light
        #endif
    }
}

extension Color {
    static let idpBackground = Color.idpAdaptive(light: ShadcnHex.bg, dark: ShadcnHex.bgDark)
    static let idpForeground = Color.idpAdaptive(light: ShadcnHex.fg, dark: ShadcnHex.fgDark)
    static let idpMuted = Color.idpAdaptive(light: ShadcnHex.muted, dark: ShadcnHex.mutedDark)
    static let idpMutedForeground = Color.idpAdaptive(light: ShadcnHex.mutedFg, dark: ShadcnHex.mutedFgDark)
    static let idpBorder = Color.idpAdaptive(light: ShadcnHex.border, dark: ShadcnHex.borderDark)
    static let idpCard = Color.idpAdaptive(light: ShadcnHex.card, dark: ShadcnHex.cardDark)
    static let idpPrimary = Color.idpAdaptive(light: ShadcnHex.primary, dark: ShadcnHex.primaryDark)
    static let idpPrimaryForeground = Color.idpAdaptive(light: ShadcnHex.primaryFg, dark: ShadcnHex.primaryFgDark)
    static let idpAccentSoft = Color.idpAdaptive(light: ShadcnHex.accentSoft, dark: ShadcnHex.accentSoftDark)
    static let idpDestructive = Color.idpAdaptive(light: ShadcnHex.destructive, dark: ShadcnHex.destructiveDark)
    static let idpOK = ShadcnHex.ok
    static let idpWarn = ShadcnHex.warn

    static var idpGroupedBackground: Color { idpBackground }
    static var idpSecondaryGroupedBackground: Color { idpCard }
    static var idpTertiaryFill: Color { idpMuted }
    static var idpSeparator: Color { idpBorder }
}

extension View {
    func idpScreenPadding(compact: Bool) -> some View {
        padding(.horizontal, IdP.horizontalPadding(compact: compact))
            .padding(.vertical, IdP.verticalPadding(compact: compact))
    }

    @ViewBuilder
    func idpInlineNavigationTitle() -> some View {
        #if os(macOS)
        self
        #else
        navigationBarTitleDisplayMode(.inline)
        #endif
    }

    @ViewBuilder
    func idpTabBarChrome() -> some View {
        #if os(macOS)
        self
        #else
        toolbarBackground(.visible, for: .tabBar)
            .toolbarBackground(.regularMaterial, for: .tabBar)
        #endif
    }

    @ViewBuilder
    func idpSearchable(text: Binding<String>, isPresented: Binding<Bool>) -> some View {
        #if os(macOS)
        searchable(text: text, isPresented: isPresented)
        #else
        searchable(text: text, isPresented: isPresented, placement: .navigationBarDrawer(displayMode: .automatic))
        #endif
    }
}

extension ToolbarItemPlacement {
    static var idpTrailingToolbar: ToolbarItemPlacement {
        #if os(macOS)
        .primaryAction
        #else
        .topBarTrailing
        #endif
    }
}