import AppKit
import SwiftUI

@MainActor
final class AlarmWindowManager {
    static let shared = AlarmWindowManager()

    private var windows: [UUID: NSWindow] = [:]

    private init() {}

    func showAlarm(
        timerID: UUID,
        timerName: String,
        onRepeat: @escaping () -> Void,
        onFinish: @escaping () -> Void
    ) {
        if let existingWindow = windows[timerID] {
            existingWindow.makeKeyAndOrderFront(nil)
            NSApp.activate(ignoringOtherApps: true)
            return
        }

        let view = AlarmPopupView(
            timerName: timerName,
            repeatAction: { [weak self] in
                onRepeat()
                self?.closeWindow(timerID: timerID)
            },
            finishAction: { [weak self] in
                onFinish()
                self?.closeWindow(timerID: timerID)
            }
        )

        let hostingView = NSHostingView(rootView: view)

        let window = NSWindow(
            contentRect: NSRect(x: 0, y: 0, width: 360, height: 210),
            styleMask: [.titled, .closable],
            backing: .buffered,
            defer: false
        )

        window.title = "Timer abgelaufen"
        window.contentView = hostingView
        window.isReleasedWhenClosed = false
        window.level = .floating
        window.center()

        windows[timerID] = window

        window.makeKeyAndOrderFront(nil)
        NSApp.activate(ignoringOtherApps: true)
    }

    func closeWindow(timerID: UUID) {
        windows[timerID]?.close()
        windows.removeValue(forKey: timerID)
    }
}

struct AlarmPopupView: View {
    let timerName: String
    let repeatAction: () -> Void
    let finishAction: () -> Void

    var body: some View {
        VStack(spacing: 18) {
            Image(systemName: "timer")
                .font(.system(size: 42))
                .foregroundStyle(.orange)

            VStack(spacing: 6) {
                Text("Timer abgelaufen")
                    .font(.title2)
                    .bold()

                Text("„\(timerName)” ist fertig.")
                    .font(.body)
                    .multilineTextAlignment(.center)
                    .foregroundStyle(.secondary)
            }

            HStack(spacing: 12) {
                Button("Beenden") {
                    finishAction()
                }
                .keyboardShortcut(.cancelAction)

                Button("Wiederholen") {
                    repeatAction()
                }
                .keyboardShortcut(.defaultAction)
            }
        }
        .padding(24)
        .frame(width: 360, height: 210)
    }
}