//
//  ShareViewController.swift
//  ShareExtension
//
//  Created by Hendrik Hogertz on 15.02.26.
//

import UIKit
import UniformTypeIdentifiers

class ShareViewController: UIViewController {

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        handleSharedItems()
    }

    private func handleSharedItems() {
        guard let extensionItems = extensionContext?.inputItems as? [NSExtensionItem] else {
            completeRequest()
            return
        }

        for item in extensionItems {
            guard let attachments = item.attachments else { continue }
            for provider in attachments {
                if provider.hasItemConformingToTypeIdentifier(UTType.url.identifier) {
                    provider.loadItem(forTypeIdentifier: UTType.url.identifier) { [weak self] item, _ in
                        if let url = item as? URL {
                            self?.openMainApp(with: url.absoluteString)
                        } else {
                            self?.completeRequest()
                        }
                    }
                    return
                } else if provider.hasItemConformingToTypeIdentifier(UTType.plainText.identifier) {
                    provider.loadItem(forTypeIdentifier: UTType.plainText.identifier) { [weak self] item, _ in
                        if let text = item as? String, let url = URL(string: text), url.scheme?.hasPrefix("http") == true {
                            self?.openMainApp(with: url.absoluteString)
                        } else {
                            self?.completeRequest()
                        }
                    }
                    return
                }
            }
        }

        completeRequest()
    }

    private func openMainApp(with urlString: String) {
        guard let encoded = urlString.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed),
              let appURL = URL(string: "nextcloud-cookbook://import?url=\(encoded)")
        else {
            completeRequest()
            return
        }

        // Use the responder chain to open the URL
        var responder: UIResponder? = self
        while let r = responder {
            if let application = r as? UIApplication {
                application.open(appURL, options: [:], completionHandler: nil)
                break
            }
            responder = r.next
        }

        // Give the system a moment to process the URL before dismissing
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) { [weak self] in
            self?.completeRequest()
        }
    }

    private func completeRequest() {
        extensionContext?.completeRequest(returningItems: nil)
    }
}