import Foundation

struct PageInFeed {

    private let swiperStyleSheetPath = "/assets/swiper/swiper-bundle.min.css"

    private let swiperJsPath = "/assets/swiper/swiper-bundle.min.js"

    let language: ContentLanguage

    let title: String

    let description: String

    let navigationBarData: NavigationBarData

    let pageNumber: Int

    let totalPages: Int

    let posts: [FeedEntryData]

    private var swiperHeader: String {
        "<link rel='stylesheet' href='\(swiperStyleSheetPath)' />"
    }

    private var swiperIsNeeded: Bool {
        posts.contains(where: { $0.images.count > 1 })
    }

    private var headers: String {
        swiperIsNeeded ? swiperHeader : ""
    }

    var content: String {
        let footer = swiperIsNeeded ? swiperInits : ""

        return GenericPage(
            language: language,
            title: title,
            description: description,
            data: navigationBarData,
            additionalHeaders: headers,
            additionalFooter: footer) { content in
            for post in posts {
                content += FeedEntry(data: post).content
            }
            content += PostFeedPageNavigation(currentPage: pageNumber, numberOfPages: totalPages, language: language).content

        }.content
    }

    private var swiperInits: String {
        var result = "<script src='\(swiperJsPath)'></script><script>"
        for post in posts {
            guard post.images.count > 1 else {
                continue
            }
            result += ImageGallery.swiperInit(id: post.entryId)
        }
        result += "</script>"
        return result
    }
}