import Elementary
import Foundation
import Infrastructure

/// A ``Page`` with fixed content, metadata, and stub assets.
struct StubPage: Page {

    // MARK: Properties

    /// The version token appended to the page's asset URLs, or `nil` to leave them unversioned.
    let assetVersion: String?

    /// The canonical URL rendered in the document head, or `nil` to omit it.
    let canonicalURL: String?

    /// The locale the page content is localized to.
    let locale: Locale

    /// The card rendered as link-preview tags in the document head, or `nil` to omit them.
    let socialCard: SocialCard?

    /// The structured data rendered as a JSON-LD script in the document head, or `nil` to omit it.
    let structuredData: StructuredData?

    /// The summary rendered in the document head, or `nil` to omit it.
    let summary: String?

    // MARK: Initializers

    /// Creates a stub page.
    /// - Parameters:
    ///   - locale: the locale the page content is localized to. Defaults to `en`.
    ///   - assetVersion: the version token appended to the page's asset URLs, or `nil` (the
    ///     default) to leave them unversioned.
    ///   - canonicalURL: the canonical URL rendered in the document head, or `nil` (the default)
    ///     to omit it.
    ///   - socialCard: the card rendered as link-preview tags in the document head, or `nil`
    ///     (the default) to omit them.
    ///   - structuredData: the structured data rendered as a JSON-LD script in the document
    ///     head, or `nil` (the default) to omit it.
    ///   - summary: the summary rendered in the document head, or `nil` (the default)
    ///     to omit it.
    init(
        locale: Locale = .init(identifier: "en"),
        assetVersion: String? = nil,
        canonicalURL: String? = nil,
        socialCard: SocialCard? = nil,
        structuredData: StructuredData? = nil,
        summary: String? = nil
    ) {
        self.assetVersion = assetVersion
        self.canonicalURL = canonicalURL
        self.locale = locale
        self.socialCard = socialCard
        self.structuredData = structuredData
        self.summary = summary
    }

    // MARK: Computed

    var content: some HTML {
        p { "Stub content" }
    }

    var lang: String {
        locale.language.languageCode?.identifier ?? "en"
    }

    var metadata: some HTML {
        meta(
            .name("stub"),
            .content("marker")
        )
    }

    var scripts: [any Asset] {
        [StubAsset(
            fileExtensions: [.css, .js],
            fileName: "stub"
        )]
    }

    var stylesheets: [any Asset] {
        [StubAsset(
            fileExtensions: [.css, .js],
            fileName: "stub"
        )]
    }

    var title: String {
        "Stub Page"
    }

}