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feat: discussion at a glance
closes #129
1 parent 5ba1935 commit 33ed309

8 files changed

Lines changed: 608 additions & 1 deletion

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‎Hax/Extensions/UserDefaultsExtension.swift‎

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@@ -11,6 +11,7 @@ extension UserDefaults {
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enum Key {
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static let defaultFeed = "defaultFeed"
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static let discussionAtAGlanceIsEnabled = "discussionAtAGlanceIsEnabled"
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static let numberOfLaunches = "numberOfLaunches"
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static let readItems = "readItems"
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static let reviewHasBeenRequested = "reviewHasBeenRequested"

‎Hax/Presentation/Components/View Models/DiscussionAtAGlanceViewModel.swift‎

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//
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// DiscussionAtAGlanceViewModel.swift
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// Hax
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//
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// Created by Luis Fariña on 9/12/25.
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//
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import Foundation
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import FoundationModels
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enum DiscussionAtAGlanceViewState: Equatable {
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// MARK: Cases
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case tapToGenerate
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case generating
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case generated(summary: String?)
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}
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@MainActor
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protocol DiscussionAtAGlanceViewModelProtocol: Observable {
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// MARK: Properties
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var state: DiscussionAtAGlanceViewState { get }
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// MARK: Methods
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func onTap() async
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}
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@Observable
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final class DiscussionAtAGlanceViewModel: DiscussionAtAGlanceViewModelProtocol {
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// MARK: Properties
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private(set) var state: DiscussionAtAGlanceViewState = .tapToGenerate
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private let item: Item
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private let minimumNumberOfComments = 2
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// MARK: Initialization
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init?(item: Item) {
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guard
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#available(iOS 26.0, *),
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SystemLanguageModel.default.isAvailable,
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item
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.comments
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.lazy
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.filter({ $0.depth == .zero })
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.prefix(minimumNumberOfComments)
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.count == minimumNumberOfComments
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else {
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return nil
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}
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self.item = item
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}
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// MARK: Methods
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func onTap() async {
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guard
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#available(iOS 26.0, *),
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state == .tapToGenerate
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else {
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return
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}
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state = .generating
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let session = LanguageModelSession(
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instructions: instructions
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)
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let prompt = (
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[
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item.title.map {
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"[Title] \($0)"
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},
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item.body.map {
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"[Description] \($0)"
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}
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] +
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item
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.comments
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.filter { $0.depth == .zero }
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.prefix(10)
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.compactMap {
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$0.item.body.map {
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"[Comment] \($0)"
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}
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}
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)
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.compacted()
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.joined(separator: "\n")
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do {
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for try await response in session.streamResponse(
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to: prompt
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) {
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state = .generated(summary: response.content)
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}
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} catch {
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state = .generated(summary: nil)
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}
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}
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}
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// MARK: - Private extension
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private extension DiscussionAtAGlanceViewModel {
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// MARK: Properties
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var instructions: String {
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let locale = Locale.current
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var instructions = """
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Summarize the comments of a Hacker News story provided in \
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the prompt. Do not quote comments directly and do not refer \
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to the order of the comments (e.g., "first comment", \
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"second comment"). Do not use enumerations, lists, or \
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numbering. When writing the summary, do not mention that \
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the comments are from Hacker News. Focus only on what \
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people discuss in the comments, not on the story itself. \
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Respond as briefly as possible.
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"""
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instructions += {
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if Locale.Language(identifier: "en_US").isEquivalent(
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to: locale.language
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) {
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""
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} else {
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"The person's locale is \(locale.identifier)."
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}
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}()
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return instructions
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}
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}

‎Hax/Presentation/Components/Views/DiscussionAtAGlanceView.swift‎

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//
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// DiscussionAtAGlanceView.swift
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// Hax
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//
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// Created by Luis Fariña on 9/12/25.
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//
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import SwiftUI
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struct DiscussionAtAGlanceView<
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Model: DiscussionAtAGlanceViewModelProtocol
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>: View {
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// MARK: Properties
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@State var model: Model
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// MARK: Body
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var body: some View {
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VStack(alignment: .leading, spacing: 10) {
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Group {
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HStack(spacing: 5) {
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Image(systemName: "apple.intelligence")
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Text("Discussion at a glance")
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.bold()
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.textCase(.uppercase)
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}
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if model.state == .tapToGenerate {
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Text(
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"""
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Tap to generate a summary of the story's \
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top comments
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"""
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)
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} else if model.state == .generating {
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Text("Generating summary…")
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}
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}
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.foregroundStyle(.secondary)
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if case .generated(let summary) = model.state {
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if let summary {
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Text(LocalizedStringKey(summary))
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} else {
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Text(
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"There was an error generating the summary."
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)
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.foregroundStyle(.secondary)
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}
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}
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}
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.animation(.default, value: model.state)
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.font(.footnote)
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.listRowBackground(listRowBackground)
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.listRowSeparator(.hidden)
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.frame(maxWidth: .infinity, alignment: .leading)
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.contentShape(Rectangle())
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.onTapGesture {
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Task {
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await model.onTap()
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}
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}
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}
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}
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// MARK: - Private extension
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private extension DiscussionAtAGlanceView {
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// MARK: Properties
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var listRowBackground: some View {
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AngularGradient(
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gradient: Gradient(
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colors: [
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Color(
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red: .zero,
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green: 0.5,
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blue: 1,
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opacity: 0.8
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),
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Color(
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red: 0.5,
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green: .zero,
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blue: 1,
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opacity: 0.7
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),
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Color(
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red: 1,
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green: .zero,
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blue: 0.5,
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opacity: 0.6
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),
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Color(
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red: 1,
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green: 0.5,
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blue: .zero,
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opacity: 0.8
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),
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Color(
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red: .zero,
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green: 0.5,
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blue: 1,
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opacity: 0.8
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)
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]
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),
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center: .center
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)
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.blur(radius: 50)
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.overlay(Color(UIColor.systemBackground).opacity(0.25))
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.clipped()
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}
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}
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#if DEBUG
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// MARK: - Previews
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// MARK: Types
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private struct PreviewDiscussionAtAGlanceViewModel: DiscussionAtAGlanceViewModelProtocol {
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// MARK: Properties
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let state: DiscussionAtAGlanceViewState
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// MARK: Methods
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func onTap() async {
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// Do nothing
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}
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}
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// MARK: Previews
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@available(iOS 26.0, *)
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#Preview {
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List {
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DiscussionAtAGlanceView(
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model: PreviewDiscussionAtAGlanceViewModel(
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state: .tapToGenerate
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)
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)
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Spacer()
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DiscussionAtAGlanceView(
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model: PreviewDiscussionAtAGlanceViewModel(
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state: .generating
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)
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)
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Spacer()
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DiscussionAtAGlanceView(
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model: PreviewDiscussionAtAGlanceViewModel(
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state: .generated(
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summary: """
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Lorem ipsum dolor sit amet, consectetur \
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adipiscing elit. Aliquam suscipit ullamcorper \
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lacus, in fringilla nulla sagittis eget. Ut \
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pretium semper ligula, non vestibulum neque \
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posuere sit amet. Quisque ut eros finibus, \
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dictum orci vel, vestibulum neque.
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"""
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)
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)
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)
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Spacer()
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DiscussionAtAGlanceView(
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model: PreviewDiscussionAtAGlanceViewModel(
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state: .generated(summary: nil)
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)
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)
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}
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.listStyle(.plain)
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}
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#endif

‎Hax/Presentation/Screens/View Models/ItemViewModel.swift‎

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@@ -36,6 +36,9 @@ protocol ItemViewModelProtocol: ObservableObject {
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/// The identifier of the comment to be highlighted.
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var highlightedCommentId: Int? { get }
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/// The model of the "discussion at a glance" view.
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var discussionAtAGlanceViewModel: DiscussionAtAGlanceViewModel? { get }
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/// The title for the view.
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var title: String { get }
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@Published var url: IdentifiableURL?
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@Published var user: IdentifiableString?
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@Published private(set) var highlightedCommentId: Int?
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@Published private(set) var discussionAtAGlanceViewModel: DiscussionAtAGlanceViewModel?
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var title: String {
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guard let descendants = item.descendants else {
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} else {
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self.item = item
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comments = item.comments
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discussionAtAGlanceViewModel = DiscussionAtAGlanceViewModel(
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item: item
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)
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}
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self.comments = comments

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