org-social-ios/App/Helpers/AppTheme.swift

import SwiftUI

struct AppTheme: Identifiable, Equatable {
    let id: String
    let name: String
    /// nil = follow system color scheme
    let colorScheme: ColorScheme?
    let accent: Color
    let background: Color
    let secondaryBackground: Color
    let primaryText: Color
    let secondaryText: Color
    let codeBackground: Color
    let codeBorder: Color
    /// highlight.js theme name used for syntax highlighting
    let highlightTheme: String

    static func == (lhs: AppTheme, rhs: AppTheme) -> Bool { lhs.id == rhs.id }
}

// MARK: - Built-in themes

extension AppTheme {
    static let all: [AppTheme] = [.default, .emacs, .dracula, .oneDark, .monokai, .material, .thankfulEyes]

    static let `default` = AppTheme(
        id: "default",
        name: "Default",
        colorScheme: nil,
        accent: Color.accentColor,
        background: Color(UIColor.systemBackground),
        secondaryBackground: Color(UIColor.secondarySystemBackground),
        primaryText: Color(UIColor.label),
        secondaryText: Color(UIColor.secondaryLabel),
        codeBackground: Color(UIColor.secondarySystemBackground),
        codeBorder: Color(UIColor.separator),
        highlightTheme: "xcode"
    )

    // Emacs – inspired by modus-vivendi (dark accessibility theme)
    static let emacs = AppTheme(
        id: "emacs",
        name: "Emacs",
        colorScheme: .dark,
        accent: Color(hex: "#4ac1f7"),
        background: Color(hex: "#1c1e1f"),
        secondaryBackground: Color(hex: "#252729"),
        primaryText: Color(hex: "#dcdccc"),
        secondaryText: Color(hex: "#7f9f7f"),
        codeBackground: Color(hex: "#0d0e0f"),
        codeBorder: Color(hex: "#3a3c3e"),
        highlightTheme: "emacs"
    )

    // Dracula – official palette (draculatheme.com)
    static let dracula = AppTheme(
        id: "dracula",
        name: "Dracula",
        colorScheme: .dark,
        accent: Color(hex: "#bd93f9"),
        background: Color(hex: "#282a36"),
        secondaryBackground: Color(hex: "#44475a"),  // official Selection/Current Line
        primaryText: Color(hex: "#f8f8f2"),
        secondaryText: Color(hex: "#6272a4"),
        codeBackground: Color(hex: "#21222c"),
        codeBorder: Color(hex: "#44475a"),
        highlightTheme: "dracula"
    )

    // One Dark – Atom / VS Code One Dark Pro palette
    static let oneDark = AppTheme(
        id: "one_dark",
        name: "One Dark",
        colorScheme: .dark,
        accent: Color(hex: "#61afef"),
        background: Color(hex: "#282c34"),
        secondaryBackground: Color(hex: "#21252b"),  // official sideBar.background
        primaryText: Color(hex: "#abb2bf"),
        secondaryText: Color(hex: "#5c6370"),
        codeBackground: Color(hex: "#21252b"),
        codeBorder: Color(hex: "#3e4451"),
        highlightTheme: "atom-one-dark"
    )

    // Monokai – TextMate classic (textmate/monokai.tmbundle)
    static let monokai = AppTheme(
        id: "monokai",
        name: "Monokai",
        colorScheme: .dark,
        accent: Color(hex: "#a6e22e"),
        background: Color(hex: "#272822"),
        secondaryBackground: Color(hex: "#49483e"),  // official line highlight color
        primaryText: Color(hex: "#f8f8f2"),
        secondaryText: Color(hex: "#75715e"),
        codeBackground: Color(hex: "#1e1f1a"),
        codeBorder: Color(hex: "#75715e"),
        highlightTheme: "monokai"
    )

    // Material – Material Design Dark (Oceanic variant)
    static let material = AppTheme(
        id: "material",
        name: "Material",
        colorScheme: .dark,
        accent: Color(hex: "#80cbc4"),
        background: Color(hex: "#263238"),
        secondaryBackground: Color(hex: "#2e3c43"),
        primaryText: Color(hex: "#eeffff"),
        secondaryText: Color(hex: "#546e7a"),
        codeBackground: Color(hex: "#1b2226"),
        codeBorder: Color(hex: "#37474f"),
        highlightTheme: "atom-one-dark"
    )

    // Thankful Eyes – high-contrast dark teal theme for accessibility (tanrax/thankful-eyes-theme.el)
    static let thankfulEyes = AppTheme(
        id: "thankful_eyes",
        name: "Thankful Eyes",
        colorScheme: .dark,
        accent: Color(hex: "#a8e1fe"),          // font-lock-function-name-face
        background: Color(hex: "#122b3b"),       // default background
        secondaryBackground: Color(hex: "#1c2f3b"),  // hl-line / mode-line background
        primaryText: Color(hex: "#faf6e4"),      // default foreground
        secondaryText: Color(hex: "#6c8b9f"),    // font-lock-comment-face
        codeBackground: Color(hex: "#0d1f2b"),   // darker than bg for code blocks
        codeBorder: Color(hex: "#4e5d62"),       // region/selection color
        highlightTheme: "atom-one-dark"
    )
}

// MARK: - Hex convenience init

extension Color {
    init(hex: String) {
        let hex = hex.trimmingCharacters(in: .alphanumerics.inverted)
        var value: UInt64 = 0
        Scanner(string: hex).scanHexInt64(&value)
        let r = Double((value >> 16) & 0xff) / 255
        let g = Double((value >> 8) & 0xff) / 255
        let b = Double(value & 0xff) / 255
        self.init(red: r, green: g, blue: b)
    }
}

// MARK: - Environment key

private struct AppThemeKey: EnvironmentKey {
    static let defaultValue: AppTheme = .default
}

extension EnvironmentValues {
    var appTheme: AppTheme {
        get { self[AppThemeKey.self] }
        set { self[AppThemeKey.self] = newValue }
    }
}