import AppKit

/**
 ProdDash Viewer: one window showing a ProdDash dashboard, a tab per
 installation when there's more than one, and Settings to say which.

 The menus are deliberately short — Back, Forward, Reload Page and Settings,
 plus what every Mac app has: the app menu, Edit (without which Copy and
 Paste do nothing in the dashboard's text fields), Window and Help.
 */
final class AppDelegate: NSObject, NSApplicationDelegate {

    static var version: String {
        Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "dev"
    }

    private var viewer: ViewerWindowController!
    private lazy var settingsWindow = SettingsWindowController()
    private lazy var helpWindow = HelpWindowController()

    func applicationWillFinishLaunching(_ notification: Notification) {
        NSWindow.allowsAutomaticWindowTabbing = false
        NSApp.mainMenu = makeMainMenu()
    }

    func applicationDidFinishLaunching(_ notification: Notification) {
        viewer = ViewerWindowController()
        viewer.onAddConnection = { [weak self] in self?.settingsWindow.show(addingConnection: true) }
        viewer.showWindow(nil)
        if ViewerSettings.shared.reopenInFullScreen {
            DispatchQueue.main.async { self.viewer.window?.toggleFullScreen(nil) }
        }
    }

    func applicationShouldHandleReopen(_ sender: NSApplication, hasVisibleWindows flag: Bool) -> Bool {
        if !flag { viewer.showWindow(nil) }
        return true
    }

    func applicationWillTerminate(_ notification: Notification) {
        viewer?.rememberFullScreen()
    }

    func applicationSupportsSecureRestorableState(_ app: NSApplication) -> Bool { true }

    @objc func showSettings(_ sender: Any?) { settingsWindow.show() }
    @objc func showViewerHelp(_ sender: Any?) { helpWindow.show() }

    // MARK: - Menus

    private func makeMainMenu() -> NSMenu {
        let name = "ProdDash Viewer"
        let main = NSMenu()

        let app = submenu(of: main, title: name)
        app.addItem(withTitle: "About \(name)",
                    action: #selector(NSApplication.orderFrontStandardAboutPanel(_:)), keyEquivalent: "")
        app.addItem(.separator())
        app.addItem(withTitle: "Settings…", action: #selector(showSettings(_:)), keyEquivalent: ",")
        app.addItem(.separator())
        let services = submenu(of: app, title: "Services")
        NSApp.servicesMenu = services
        app.addItem(.separator())
        app.addItem(withTitle: "Hide \(name)", action: #selector(NSApplication.hide(_:)), keyEquivalent: "h")
        app.addItem(withTitle: "Hide Others", action: #selector(NSApplication.hideOtherApplications(_:)),
                    keyEquivalent: "h").keyEquivalentModifierMask = [.command, .option]
        app.addItem(withTitle: "Show All", action: #selector(NSApplication.unhideAllApplications(_:)), keyEquivalent: "")
        app.addItem(.separator())
        app.addItem(withTitle: "Quit \(name)", action: #selector(NSApplication.terminate(_:)), keyEquivalent: "q")

        let edit = submenu(of: main, title: "Edit")
        edit.addItem(withTitle: "Undo", action: Selector(("undo:")), keyEquivalent: "z")
        edit.addItem(withTitle: "Redo", action: Selector(("redo:")), keyEquivalent: "Z")
        edit.addItem(.separator())
        edit.addItem(withTitle: "Cut", action: #selector(NSText.cut(_:)), keyEquivalent: "x")
        edit.addItem(withTitle: "Copy", action: #selector(NSText.copy(_:)), keyEquivalent: "c")
        edit.addItem(withTitle: "Paste", action: #selector(NSText.paste(_:)), keyEquivalent: "v")
        edit.addItem(withTitle: "Select All", action: #selector(NSText.selectAll(_:)), keyEquivalent: "a")

        let view = submenu(of: main, title: "View")
        view.addItem(withTitle: "Back", action: #selector(ViewerWindowController.goBackInPage(_:)), keyEquivalent: "[")
        view.addItem(withTitle: "Forward", action: #selector(ViewerWindowController.goForwardInPage(_:)), keyEquivalent: "]")
        view.addItem(withTitle: "Reload Page", action: #selector(ViewerWindowController.reloadPage(_:)), keyEquivalent: "r")
        view.addItem(.separator())
        // AppKit retitles this "Exit Full Screen" while the window is in full screen.
        view.addItem(withTitle: "Enter Full Screen", action: #selector(NSWindow.toggleFullScreen(_:)),
                     keyEquivalent: "f").keyEquivalentModifierMask = [.command, .control]

        let window = submenu(of: main, title: "Window")
        window.addItem(withTitle: "Close", action: #selector(NSWindow.performClose(_:)), keyEquivalent: "w")
        window.addItem(withTitle: "Minimize", action: #selector(NSWindow.performMiniaturize(_:)), keyEquivalent: "m")
        window.addItem(withTitle: "Zoom", action: #selector(NSWindow.performZoom(_:)), keyEquivalent: "")
        window.addItem(.separator())
        window.addItem(withTitle: "Bring All to Front", action: #selector(NSApplication.arrangeInFront(_:)), keyEquivalent: "")
        NSApp.windowsMenu = window

        let help = submenu(of: main, title: "Help")
        help.addItem(withTitle: "\(name) Help", action: #selector(showViewerHelp(_:)), keyEquivalent: "?")
        NSApp.helpMenu = help

        return main
    }

    @discardableResult
    private func submenu(of parent: NSMenu, title: String) -> NSMenu {
        let menu = NSMenu(title: title)
        parent.addItem(withTitle: title, action: nil, keyEquivalent: "").submenu = menu
        return menu
    }
}