import AppKit
import WebKit

/// Help → ProdDash Viewer Help: the page that ships inside the app, so it
/// opens with no network and always matches this version.
final class HelpWindowController: NSWindowController, WKNavigationDelegate {

    convenience init() {
        let web = WKWebView()
        let window = NSWindow(
            contentRect: NSRect(x: 0, y: 0, width: 640, height: 720),
            styleMask: [.titled, .closable, .miniaturizable, .resizable],
            backing: .buffered, defer: false)
        window.title = "ProdDash Viewer Help"
        window.minSize = NSSize(width: 420, height: 360)
        window.contentView = web
        window.tabbingMode = .disallowed
        window.isRestorable = false
        window.center()
        window.setFrameAutosaveName("ProdDashViewerHelp")
        self.init(window: window)
        web.navigationDelegate = self
        if let page = Bundle.main.url(forResource: "index", withExtension: "html", subdirectory: "Help") {
            web.loadFileURL(page, allowingReadAccessTo: page.deletingLastPathComponent())
        }
    }

    func show() {
        showWindow(nil)
        window?.makeKeyAndOrderFront(nil)
    }

    /// The help page itself stays here; its links to the web open in the browser.
    func webView(_ webView: WKWebView, decidePolicyFor action: WKNavigationAction,
                 decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
        guard let url = action.request.url, !url.isFileURL, url.scheme != "about" else {
            return decisionHandler(.allow)
        }
        NSWorkspace.shared.open(url)
        decisionHandler(.cancel)
    }
}