Simplify images, tag overview

CHDataManagement/Generator/Page Generators/FeedPageGenerator.swift

@@ -0,0 +1,87 @@
+import Foundation
+
+final class FeedPageGenerator {
+
+    let results: PageGenerationResults
+
+    let content: Content
+
+    init(content: Content, results: PageGenerationResults) {
+        self.content = content
+        self.results = results
+    }
+
+    private func includeSwiper(in headers: inout Set<HeaderElement>) {
+        if let swiperCss = content.settings.posts.swiperCssFile {
+            headers.insert(.css(file: swiperCss, order: HeaderElement.swiperCssFileOrder))
+            results.require(file: swiperCss)
+        }
+        if let swiperJs = content.settings.posts.swiperJsFile {
+            headers.insert(.js(file: swiperJs, defer: true))
+            results.require(file: swiperJs)
+        }
+    }
+
+    func generatePage(language: ContentLanguage,
+                      posts: [FeedEntryData],
+                      title: String,
+                      description: String?,
+                      showTitle: Bool,
+                      pageNumber: Int,
+                      totalPages: Int,
+                      languageButtonUrl: String,
+                      linkPrefix: String) -> String {
+        var headers = content.defaultPageHeaders
+        var footer = ""
+        if posts.contains(where: { $0.images.count > 1 }) {
+            // Sort swiper style sheet before default style sheet
+            includeSwiper(in: &headers)
+            footer = swiperInitScript(posts: posts)
+        }
+
+        let iconUrl = content.settings.navigation.localized(in: language).rootUrl
+        let languageButton = NavigationBar.Link(
+            text: language.next.rawValue,
+            url: languageButtonUrl)
+
+        let pageHeader = PageHeader(
+            language: language,
+            title: title,
+            description: description,
+            iconUrl: iconUrl,
+            languageButton: languageButton,
+            links: content.navigationBar(in: language),
+            headers: headers,
+            icons: [])
+
+        let page = GenericPage(
+            header: pageHeader,
+            additionalFooter: footer) { content in
+                if showTitle {
+                    content += "<h1>\(title)</h1>"
+                }
+                for post in posts {
+                    content += FeedEntry(data: post).content
+                }
+                if totalPages > 1 {
+                    content += PostFeedPageNavigation(
+                        linkPrefix: linkPrefix,
+                        currentPage: pageNumber,
+                        numberOfPages: totalPages).content
+                }
+            }
+        return page.content
+    }
+
+    func swiperInitScript(posts: [FeedEntryData]) -> String {
+        var result = "<script> window.onload = () => { "
+        for post in posts {
+            guard post.images.count > 1 else {
+                continue
+            }
+            result += ImageGallery.swiperInit(id: post.entryId)
+        }
+        result += "}; </script>"
+        return result
+    }
+}