import Foundation

struct PrefilledTopBarTemplate {

    let language: String

    let sections: [SectionInfo]

    let topBarWebsiteTitle: String

    private let factory: TemplateFactory

    init(factory: TemplateFactory, language: String, sections: [SectionInfo], topBarWebsiteTitle: String) {
        self.factory = factory
        self.language = language
        self.sections = sections
        self.topBarWebsiteTitle = topBarWebsiteTitle
    }

    func generate(sectionUrl: String?, languageButton: String?, page: Element) -> String {
        var content = [TopBarTemplate.Key : String]()
        content[.title] = topBarWebsiteTitle
        content[.titleLink] = factory.html.topBarWebsiteTitle(language: language, from: page)
        content[.elements] = elements(activeSectionUrl: sectionUrl)
        content[.languageButton] = languageButton.unwrapped(factory.html.topBarLanguageButton) ?? ""
        return factory.topBar.generate(content)
    }

    private func elements(activeSectionUrl: String?) -> String {
        sections
            .map { factory.html.topBarNavigationLink(url: $0.url, text: $0.name, isActive: activeSectionUrl == $0.url) }
            .joined(separator: "\n")
    }

    struct SectionInfo {

        let name: String

        let url: String
    }
}