//
//  WebView.swift
//  Zyquo Atlas
//
//  Author: Simon-Pierre Boucher
//  Mail: contact@spboucher.ai
//
//  SwiftUI host for a Tab's WKWebView. Kept intentionally thin: navigation
//  state, delegates, and KVO live on the Tab; this only mounts the existing
//  web view into the view tree (WebKit's own out-of-process rendering keeps the
//  page off the main thread). Swapping the active tab swaps which web view is
//  hosted, so background tabs keep their live web views.
//

import SwiftUI
import WebKit

struct WebView: NSViewRepresentable {
    let tab: Tab

    func makeNSView(context: Context) -> ContainerView {
        let container = ContainerView()
        container.mount(tab.webView)
        return container
    }

    func updateNSView(_ container: ContainerView, context: Context) {
        // Re-mount only when the hosted web view actually changed (tab switch).
        if container.hostedWebView !== tab.webView {
            container.mount(tab.webView)
        }
    }

    /// A plain container that pins a single WKWebView to its bounds.
    final class ContainerView: NSView {
        private(set) weak var hostedWebView: WKWebView?

        func mount(_ webView: WKWebView) {
            guard hostedWebView !== webView else { return }
            hostedWebView?.removeFromSuperview()
            webView.translatesAutoresizingMaskIntoConstraints = false
            addSubview(webView)
            NSLayoutConstraint.activate([
                webView.topAnchor.constraint(equalTo: topAnchor),
                webView.bottomAnchor.constraint(equalTo: bottomAnchor),
                webView.leadingAnchor.constraint(equalTo: leadingAnchor),
                webView.trailingAnchor.constraint(equalTo: trailingAnchor),
            ])
            hostedWebView = webView
        }
    }
}