import AppKit
import Foundation

/// The menu bar item: the app's only permanent UI, and the place to turn the
/// wheel off or fall back to picking files by hand.
final class MenuBarController: NSObject, NSMenuDelegate {
    private var statusItem: NSStatusItem?

    func install() {
        let item = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)
        if let button = item.button {
            let image = NSImage(systemSymbolName: "arrow.triangle.2.circlepath", accessibilityDescription: "Konverter")
            image?.isTemplate = true
            button.image = image
            button.setAccessibilityLabel("Konverter")
        }
        let menu = NSMenu()
        menu.delegate = self
        item.menu = menu
        statusItem = item
        rebuild(menu)
    }

    func menuNeedsUpdate(_ menu: NSMenu) {
        rebuild(menu)
    }

    private func rebuild(_ menu: NSMenu) {
        menu.removeAllItems()

        let enabled = Settings.shared.enabled
        let toggle = NSMenuItem(
            title: enabled ? "Konverter Active" : "Konverter Paused",
            action: #selector(toggleEnabled),
            keyEquivalent: ""
        )
        toggle.target = self
        toggle.state = enabled ? .on : .off
        menu.addItem(toggle)

        menu.addItem(.separator())

        let convert = NSMenuItem(title: "Konvert Files…", action: #selector(convertFiles), keyEquivalent: "o")
        convert.target = self
        menu.addItem(convert)

        let jobs = NSMenuItem(title: "Show Jobs", action: #selector(showJobs), keyEquivalent: "j")
        jobs.target = self
        menu.addItem(jobs)

        menu.addItem(.separator())

        let settings = NSMenuItem(title: "Settings…", action: #selector(showSettings), keyEquivalent: ",")
        settings.target = self
        menu.addItem(settings)

        let about = NSMenuItem(title: "About Konverter", action: #selector(showAbout), keyEquivalent: "")
        about.target = self
        menu.addItem(about)

        menu.addItem(.separator())

        let quit = NSMenuItem(title: "Quit Konverter", action: #selector(NSApplication.terminate(_:)), keyEquivalent: "q")
        quit.target = NSApp
        menu.addItem(quit)
    }

    @objc private func toggleEnabled() {
        Settings.shared.enabled.toggle()
        if !Settings.shared.enabled {
            WheelController.shared.cancel()
        }
        if let menu = statusItem?.menu {
            rebuild(menu)
        }
    }

    @objc private func convertFiles() {
        let panel = NSOpenPanel()
        panel.canChooseFiles = true
        panel.canChooseDirectories = true
        panel.allowsMultipleSelection = true
        panel.prompt = "Choose"
        panel.message = "Pick files to convert, then choose an output format"
        NSApp.activate(ignoringOtherApps: true)
        guard panel.runModal() == .OK, !panel.urls.isEmpty else { return }
        // Let the panel close before the menu opens over it.
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
            QuickMenu.show(urls: panel.urls, at: NSEvent.mouseLocation)
        }
    }

    @objc private func showJobs() {
        JobStore.shared.panelVisible = true
        JobPanelController.shared.show()
    }

    @objc private func showSettings() {
        PreferencesWindowController.shared.show()
    }

    @objc private func showAbout() {
        NSApp.activate(ignoringOtherApps: true)
        NSApp.orderFrontStandardAboutPanel(options: [
            .applicationName: "Konverter",
            .applicationVersion: Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "1.0",
            .credits: NSAttributedString(
                string: "Drag a file in Finder, then hold a key.\nShift converts · Command shows tools · Control shows file actions.\nEverything runs on this Mac.",
                attributes: [.font: NSFont.systemFont(ofSize: 11)]
            )
        ])
    }
}