import Infrastructure

/// A static file shipped with the website service.
///
/// Each case identifies a file name stored under the static files root (the `Resources/Static` directory) and served by Hummingbird's
/// `FileMiddleware` middleware. A name can be available with more than one extension (see ``fileExtensions``), each resolving to its own file.
enum StaticFile: Asset, CaseIterable {
    /// The `apple-touch-icon.png` icon.
    case appleTouchIcon
    /// The `css/error.css` stylesheet and `js/error.js` script for the not-found page.
    case error
    /// The `favicon.ico` icon.
    case favicon
    /// The `icon.svg` icon.
    case icon
    /// The `icon-192.png` icon for the web manifest.
    case icon192
    /// The `icon-512.png` icon for the web manifest.
    case icon512
    /// The `css/index.css` stylesheet and `js/index.js` script for the landing page.
    case index
    /// The `robots.txt` crawler directives.
    case robots
    /// The `css/shared.css` stylesheet and `js/shared.js` script shared across pages.
    case shared
    /// The `site.webmanifest` web application manifest.
    case site
    /// The `sitemap.xml` crawler sitemap.
    case sitemap
}

// MARK: - Extensions

extension StaticFile {

    // MARK: Computed
    
    /// The file extensions the file is available with.
    var fileExtensions: [AssetExtension] {
        switch self {
        case .appleTouchIcon,
             .icon192,
             .icon512: [.png]
        case .error,
             .index,
             .shared: [.css, .js]
        case .favicon: [.ico]
        case .icon: [.svg]
        case .robots: [.txt]
        case .site: [.webmanifest]
        case .sitemap: [.xml]
        }
    }

    /// The file's name, without extension.
    var fileName: String {
        switch self {
        case .appleTouchIcon: "apple-touch-icon"
        case .error: "error"
        case .favicon: "favicon"
        case .icon: "icon"
        case .icon192: "icon-192"
        case .icon512: "icon-512"
        case .index: "index"
        case .robots: "robots"
        case .shared: "shared"
        case .site: "site"
        case .sitemap: "sitemap"
        }
    }

}