swiftapp/swift/Sources/Core/Design/SIOTokens.swift

import SwiftUI

public enum SIO {
    public static let tint = Color("SIOTint")
    public static let laneFeed = Color("LaneFeed")
    public static let lanePaper = Color("LanePaper")
    public static let lanePeople = Color("LanePeople")
    public static let cardRadius: CGFloat = 14
    public static let controlRadius: CGFloat = 10
    public static let chipRadius: CGFloat = 6
}

public enum Lane: String, CaseIterable, Codable, Identifiable {
    case feed
    case paper
    case people

    public var id: String { rawValue }

    public var label: String {
        switch self {
        case .feed: "Feed"
        case .paper: "Paper"
        case .people: "People"
        }
    }

    public var color: Color {
        switch self {
        case .feed: SIO.laneFeed
        case .paper: SIO.lanePaper
        case .people: SIO.lanePeople
        }
    }
}

public enum ThreadRowDensity: String, CaseIterable, Identifiable {
    case compact
    case cozy
    case comfortable

    public var id: String { rawValue }

    public var avatarSize: CGFloat {
        switch self {
        case .compact: 24
        case .cozy: 30
        case .comfortable: 30
        }
    }

    public var previewLineLimit: Int {
        switch self {
        case .compact, .cozy: 1
        case .comfortable: 2
        }
    }

    public var rowPadding: CGFloat {
        switch self {
        case .compact: 10
        case .cozy: 12
        case .comfortable: 14
        }
    }

    public var showsMetaChips: Bool {
        self == .comfortable
    }
}

public enum ThemePreference: String, CaseIterable, Identifiable {
    case system
    case light
    case dark

    public var id: String { rawValue }

    public var label: String {
        switch self {
        case .system: "System"
        case .light: "Light"
        case .dark: "Dark"
        }
    }

    public var colorScheme: ColorScheme? {
        switch self {
        case .system: nil
        case .light: .light
        case .dark: .dark
        }
    }
}

public enum ReadingPanePreference: String, CaseIterable, Identifiable {
    case right
    case bottom
    case off

    public var id: String { rawValue }

    public var label: String {
        switch self {
        case .right: "Right"
        case .bottom: "Bottom"
        case .off: "Off"
        }
    }
}

public extension View {
    func sioCardBackground(tint: Color? = nil, cornerRadius: CGFloat = SIO.cardRadius) -> some View {
        background(.regularMaterial, in: RoundedRectangle(cornerRadius: cornerRadius, style: .continuous))
            .overlay(
                RoundedRectangle(cornerRadius: cornerRadius, style: .continuous)
                    .fill((tint ?? Color.clear).opacity(0.08))
            )
            .overlay(
                RoundedRectangle(cornerRadius: cornerRadius, style: .continuous)
                    .strokeBorder(Color.primary.opacity(0.08), lineWidth: 1)
            )
    }

    func sioSoftSelection(_ isSelected: Bool) -> some View {
        background(
            RoundedRectangle(cornerRadius: SIO.cardRadius, style: .continuous)
                .fill(isSelected ? SIO.tint.opacity(0.12) : Color.clear)
        )
    }

    func sioProse() -> some View {
        font(.system(size: 15.5))
            .lineSpacing(6)
    }
}