import Foundation
struct PostFeedPageNavigation {
/// Includes a leading slash
let linkPrefix: String
let currentPage: Int
let numberOfPages: Int
init(linkPrefix: String, currentPage: Int, numberOfPages: Int) {
self.linkPrefix = linkPrefix
self.currentPage = currentPage
self.numberOfPages = numberOfPages
}
private func pageLink(_ page: Int) -> String {
"href='\(linkPrefix)/\(page)'"
}
private func addPreviousButton(to result: inout String) {
if currentPage == 1 {
// Disable the previous button if we are on the first page
result += ""
} else {
let link = pageLink(currentPage - 1)
result += ""
}
result += ""
}
private func addNextButton(to result: inout String) {
if currentPage == numberOfPages {
// Disable the previous button if we are on the first page
result += ""
} else {
let link = pageLink(currentPage + 1)
result += ""
}
result += ""
}
private func addLink(page: Int, to result: inout String) {
result += "\(page)"
}
var content: String {
var result = "
"
addPreviousButton(to: &result)
// Add a maximum of two buttons before the current page
if currentPage > 2 {
addLink(page: currentPage - 2, to: &result)
}
if currentPage > 1 {
addLink(page: currentPage - 1, to: &result)
}
// Add the current page
result += "\(currentPage)"
// Add a maximum of two buttons after the current page
if currentPage < numberOfPages {
addLink(page: currentPage + 1, to: &result)
}
if currentPage + 1 < numberOfPages {
addLink(page: currentPage + 2, to: &result)
}
addNextButton(to: &result)
result += "