import SwiftUI
import UIKit
import UniformTypeIdentifiers

/// Phase ζ-4 Placeholder — Share-Extension „An Zitare schicken".
///
/// Aufgaben in ζ-4:
///
/// - Empfängt `NSExtensionActivationSupportsText` + `WebURL`.
/// - SwiftUI-Sheet mit Quote-Preview, Source-URL, „Als Draft
///   speichern"-Button.
/// - POST an `https://zitare-api.mana.how/api/v1/share/receive`
///   mit Envelope-Type `mana/text` (siehe `zitare/app-manifest.json`).
/// - Bei Network-Failure: in `PendingShareStore` unter App-Group
///   persistieren, die App synct beim nächsten Launch.
///
/// Erfordert ManaCore-Auth-Sharing über Keychain-Access-Group +
/// App-Group. Auth-Bridge-Pattern aus cards-native (ShareExtension/)
/// übernehmen, wenn ζ-4 startet.
class ShareViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        let hosting = UIHostingController(
            rootView: ShareRootView(onDone: { [weak self] in
                self?.extensionContext?.completeRequest(returningItems: nil)
            })
        )
        addChild(hosting)
        view.addSubview(hosting.view)
        hosting.view.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            hosting.view.topAnchor.constraint(equalTo: view.topAnchor),
            hosting.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
            hosting.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            hosting.view.trailingAnchor.constraint(equalTo: view.trailingAnchor)
        ])
        hosting.didMove(toParent: self)
    }
}

struct ShareRootView: View {
    let onDone: () -> Void

    var body: some View {
        VStack(spacing: 16) {
            Image(systemName: "quote.opening")
                .font(.system(size: 48))
            Text("An Zitare schicken")
                .font(.headline)
            Text("ζ-4 — TODO: POST /api/v1/share/receive")
                .font(.caption)
                .foregroundStyle(.secondary)
            Button("Schließen", action: onDone)
                .buttonStyle(.borderedProminent)
        }
        .padding()
    }
}