import AppKit
import LChatCore
import SwiftUI

// 🤖 "Media, links and docs" as a real window, one per chat — the spec's
// "window-pushed view on Mac" (docs/superpowers/specs/
// 2026-08-05-media-links-docs-design.md § Native). A sheet was the first
// shape and it was wrong: macOS sheets can't be resized, and this surface is
// exactly the one you want to make big — a screenshot full of small text is
// unreadable at any fixed size. A window resizes, zooms, and goes full
// screen, and the collection viewer inside it grows to match.
//
// LChatMacApp deliberately uses `Window` (not `WindowGroup`), so `openWindow`
// isn't available: hand-rolled NSWindow + NSHostingController is the
// sanctioned pattern here, same as ThreadDebugWindows.
@MainActor
enum MediaWindows {
    private static var windows: [String: NSWindow] = [:]
    private static var closeObservers: [String: NSObjectProtocol] = [:]

    static func show(instance: SavedInstance, thread: ChatThread, store: ThreadStore,
                     model: ChatFeedModel, onJump: @escaping (Int64) -> Void) {
        let key = "\(instance.origin)|\(thread.id)"
        if let w = windows[key] {
            w.makeKeyAndOrderFront(nil)
            return
        }
        let view = MediaLinksDocsSheet(instance: instance, thread: thread, store: store,
                                       model: model,
                                       onJump: { sid in
                                           close(key)
                                           onJump(sid)
                                       })
        let w = NSWindow(contentViewController: NSHostingController(rootView: view))
        w.title = "Media, links and docs"
        w.subtitle = thread.title
        w.setContentSize(NSSize(width: 820, height: 660))
        // The dict keeps the window alive; releasedWhenClosed would have
        // AppKit deallocate it under us on close.
        w.isReleasedWhenClosed = false
        windows[key] = w
        closeObservers[key] = NotificationCenter.default.addObserver(
            forName: NSWindow.willCloseNotification, object: w, queue: .main
        ) { _ in
            Task { @MainActor in
                windows[key] = nil
                if let o = closeObservers.removeValue(forKey: key) {
                    NotificationCenter.default.removeObserver(o)
                }
            }
        }
        w.center()
        w.makeKeyAndOrderFront(nil)
    }

    private static func close(_ key: String) {
        windows[key]?.close()
    }
}