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import WebKit
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import SwiftUI
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struct WebView: UIViewRepresentable {
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    typealias UIViewType = WKWebView
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    let webView: WKWebView
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    func makeUIView(context: Context) -> WKWebView {
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        return webView
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    }
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    func updateUIView(_ uiView: WKWebView, context: Context) { }
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}
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class WebViewNavigationDelegate: NSObject, WKNavigationDelegate {
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    func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
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        // TODO
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        decisionHandler(.allow)
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    }
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    func webView(_ webView: WKWebView, decidePolicyFor navigationResponse: WKNavigationResponse, decisionHandler: @escaping (WKNavigationResponsePolicy) -> Void) {
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        // TODO
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        decisionHandler(.allow)
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    }
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}
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class WebViewModel: ObservableObject {
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    let webView: WKWebView
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    private let navigationDelegate: WebViewNavigationDelegate
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    init() {
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        let configuration = WKWebViewConfiguration()
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        configuration.websiteDataStore = .nonPersistent()
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        webView = WKWebView(frame: .zero, configuration: configuration)
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        navigationDelegate = WebViewNavigationDelegate()
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        webView.navigationDelegate = navigationDelegate
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        setupBindings()
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    }
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    @Published var urlString: String = ""
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    @Published var canGoBack: Bool = false
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    @Published var canGoForward: Bool = false
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    @Published var isLoading: Bool = false
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    private func setupBindings() {
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        webView.publisher(for: \.canGoBack)
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            .assign(to: &$canGoBack)
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        webView.publisher(for: \.canGoForward)
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            .assign(to: &$canGoForward)
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        webView.publisher(for: \.isLoading)
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            .assign(to: &$isLoading)
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    }
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    func loadUrl() {
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        guard let url = URL(string: urlString) else {
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            return
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        }
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        webView.load(URLRequest(url: url))
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    }
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    func loadHTML(html: String) {
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        webView.loadHTMLString(html, baseURL: nil)
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    }
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    func goForward() {
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        webView.goForward()
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    }
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    func goBack() {
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        webView.goBack()
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    }
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}