pageta-native/Sources/Features/FeedItemReaderView.swift

import ManaAuthUI
import ManaCore
import SwiftUI

/// Reader für Feed-Items (Pool-Artikel, noch nicht in der Lese-Liste).
///
/// FeedItems kommen schon mit Readability-extrahiertem `content` aus
/// dem Pool, also können wir sie direkt im Native-Reader anzeigen ohne
/// Save-Roundtrip. Toolbar-Action „In Lese-Liste" macht den Save dann
/// explizit.
struct FeedItemReaderView: View {
	let item: FeedItem

	@Environment(AuthClient.self) private var auth
	private var api: PagetaAPI { PagetaAPI(auth: auth) }

	@State private var saveState: SaveState = .idle

	enum SaveState: Equatable {
		case idle
		case saving
		case saved
		case error(String)
	}

	var body: some View {
		ScrollView {
			VStack(alignment: .leading, spacing: 20) {
				header
				ForEach(paragraphs, id: \.self) { paragraph in
					Text(paragraph)
						.font(.body)
						.foregroundStyle(PagetaTheme.foreground)
						.fixedSize(horizontal: false, vertical: true)
				}
			}
			.padding(.horizontal, 20)
			.padding(.vertical, 16)
			.frame(maxWidth: 720, alignment: .leading)
			.frame(maxWidth: .infinity, alignment: .leading)
		}
		.background(PagetaTheme.background)
		.contentMargins(.bottom, 60, for: .scrollContent)
		.navigationTitle("")
		#if os(iOS)
			.navigationBarTitleDisplayMode(.inline)
		#endif
		.toolbar { toolbarContent }
	}

	private var header: some View {
		VStack(alignment: .leading, spacing: 8) {
			HStack(spacing: 6) {
				Text(item.topic.emoji)
				Text(item.topic.label)
					.font(.caption.weight(.medium))
					.foregroundStyle(.secondary)
				Text("•").foregroundStyle(.secondary)
				Text(item.siteName)
					.font(.caption)
					.foregroundStyle(.secondary)
				if let mins = item.readingTimeMinutes {
					Text("•").foregroundStyle(.secondary)
					Text("\(mins) min lesen")
						.font(.caption)
						.foregroundStyle(.secondary)
				}
				Spacer()
			}
			Text(item.title)
				.font(.system(.title2, design: .serif, weight: .semibold))
				.foregroundStyle(PagetaTheme.foreground)
			if let author = item.author, !author.isEmpty {
				Text("von \(author)")
					.font(.subheadline)
					.foregroundStyle(.secondary)
			}
		}
	}

	@ToolbarContentBuilder
	private var toolbarContent: some ToolbarContent {
		ToolbarItem(placement: .primaryAction) {
			Menu {
				Button {
					Task { await save() }
				} label: {
					Label(saveLabel, systemImage: saveIcon)
				}
				.disabled(saveState == .saving || saveState == .saved)
				if let url = URL(string: item.originalUrl) {
					Link(destination: url) {
						Label("Im Browser öffnen", systemImage: "safari")
					}
					ShareLink(item: url) {
						Label("Teilen", systemImage: "square.and.arrow.up")
					}
				}
			} label: {
				Image(systemName: "ellipsis")
			}
		}
	}

	private var saveLabel: String {
		switch saveState {
		case .idle: "Auf den Stapel speichern"
		case .saving: "Speichere …"
		case .saved: "Gespeichert"
		case .error: "Erneut versuchen"
		}
	}

	private var saveIcon: String {
		switch saveState {
		case .idle, .error: "books.vertical"
		case .saving: "ellipsis"
		case .saved: "checkmark"
		}
	}

	private var paragraphs: [String] {
		item.content
			.components(separatedBy: "\n\n")
			.map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }
			.filter { !$0.isEmpty }
	}

	private func save() async {
		guard let url = URL(string: item.originalUrl) else {
			saveState = .error("Ungültige URL")
			return
		}
		saveState = .saving
		do {
			try await api.saveArticle(url: url)
			saveState = .saved
		} catch {
			saveState = .error(error.localizedDescription)
		}
	}
}