import AppKit
import ServiceManagement
import SwiftUI

final class AppDelegate: NSObject, NSApplicationDelegate {
    static weak var shared: AppDelegate?

    private var statusItem: NSStatusItem!
    private var popover: NSPopover!
    private var floatingWidget: FloatingWidgetWindow?
    private let bugStore = BugStore.shared

    func applicationDidFinishLaunching(_ notification: Notification) {
        Self.shared = self
        NSApp.setActivationPolicy(.accessory)

        NSAppleEventManager.shared().setEventHandler(
            self,
            andSelector: #selector(handleURLEvent(_:withReplyEvent:)),
            forEventClass: AEEventClass(kInternetEventClass),
            andEventID: AEEventID(kAEGetURL)
        )

        setupStatusItem()
        setupPopover()

        if let config = AppStateService.shared.config {
            if config.showFloatingWidget {
                showFloatingWidget()
            }
            if config.launchAtLogin {
                try? SMAppService.mainApp.register()
            }
        }

        Task {
            await PollerService.shared.startIfConfigured()
        }
    }

    private func setupStatusItem() {
        statusItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)
        if let button = statusItem.button {
            button.image = NSImage(systemSymbolName: "ant.fill", accessibilityDescription: "Bugger")
            button.action = #selector(togglePopover)
            button.target = self
        }
        updateBadge(count: bugStore.unseenActiveCount)
    }

    private func setupPopover() {
        popover = NSPopover()
        popover.contentSize = NSSize(width: 360, height: 500)
        popover.behavior = .transient
        popover.contentViewController = NSHostingController(rootView: BugListPopover())
    }

    func updateBadge(count: Int) {
        if count > 0 {
            statusItem.button?.title = " \(count)"
        } else {
            statusItem.button?.title = ""
        }
    }

    @objc func togglePopover() {
        guard let button = statusItem.button else { return }

        if popover.isShown {
            closePopover()
        } else {
            popover.show(relativeTo: button.bounds, of: button, preferredEdge: .minY)
            popover.contentViewController?.view.window?.makeKey()
        }
    }

    func closePopover() {
        popover.performClose(nil)
    }

    func showFloatingWidget() {
        guard floatingWidget == nil else { return }
        floatingWidget = FloatingWidgetWindow()
        floatingWidget?.orderFrontRegardless()
    }

    func hideFloatingWidget() {
        floatingWidget?.close()
        floatingWidget = nil
    }

    @objc private func handleURLEvent(_ event: NSAppleEventDescriptor, withReplyEvent: NSAppleEventDescriptor) {
        guard let urlString = event.paramDescriptor(forKeyword: keyDirectObject)?.stringValue,
              let url = URL(string: urlString) else {
            return
        }
        OAuthCallbackHandler.handle(url)
    }
}