import SwiftUI

/// Button whose chrome scales, not just its label.
///
/// The system `.bordered` style sizes its padding, height and corner radius
/// from `controlSize`, which has four fixed steps — setting a larger font on it
/// grows the text inside a button that stays the same size. This style derives
/// every dimension from the zoom multiplier instead.
struct ScaledButtonStyle: ButtonStyle {
    let scale: CGFloat
    /// Text-only variant, for secondary actions like "Открыть".
    var borderless = false

    func makeBody(configuration: Configuration) -> some View {
        Label(configuration: configuration, scale: scale, borderless: borderless)
    }

    /// Not named `Body`: that collides with `ButtonStyle`'s own associated type.
    private struct Label: View {
        let configuration: ButtonStyleConfiguration
        let scale: CGFloat
        let borderless: Bool
        /// A custom style has to dim itself — SwiftUI only does that for the
        /// built-in ones.
        @Environment(\.isEnabled) private var isEnabled

        var body: some View {
            configuration.label
                .font(.system(size: 12 * scale))
                .lineLimit(1)
                .padding(.horizontal, borderless ? 2 * scale : 10 * scale)
                .padding(.vertical, borderless ? 1 * scale : 5 * scale)
                .background(background)
                .foregroundStyle(borderless ? Color.accentColor : Color.primary)
                .opacity(isEnabled ? (configuration.isPressed ? 0.7 : 1) : 0.4)
                .contentShape(Rectangle())
        }

        @ViewBuilder
        private var background: some View {
            if borderless {
                Color.clear
            } else {
                RoundedRectangle(cornerRadius: 6 * scale, style: .continuous)
                    .fill(Color.primary.opacity(configuration.isPressed ? 0.16 : 0.08))
                    .overlay(
                        RoundedRectangle(cornerRadius: 6 * scale, style: .continuous)
                            .strokeBorder(Color.primary.opacity(0.12), lineWidth: 1)
                    )
            }
        }
    }
}