//  StatusMenuController.swift
//  GreenshotMac
//
//  The menu bar item, equivalent to Greenshot's tray icon and context menu.

import AppKit

@MainActor
final class StatusMenuController: NSObject, NSMenuDelegate {

    private let statusItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)
    private var preferencesController: PreferencesWindowController?

    override init() {
        super.init()
        if let button = statusItem.button {
            button.image = NSImage(systemSymbolName: "camera.viewfinder", accessibilityDescription: "GreenshotMac")
            button.image?.isTemplate = true
            button.toolTip = "GreenshotMac"
        }
        statusItem.menu = buildMenu()
    }

    private func buildMenu() -> NSMenu {
        let menu = NSMenu()
        menu.delegate = self

        menu.addItem(item(title: "Capture region",
                          action: #selector(captureRegion),
                          hotkey: HotkeyBindings.shared.spec(for: .region)))
        menu.addItem(item(title: "Capture window",
                          action: #selector(captureWindow),
                          hotkey: HotkeyBindings.shared.spec(for: .window)))
        menu.addItem(item(title: "Capture full screen",
                          action: #selector(captureFullscreen),
                          hotkey: HotkeyBindings.shared.spec(for: .fullscreen)))
        menu.addItem(item(title: "Capture last region",
                          action: #selector(captureLastRegion),
                          hotkey: HotkeyBindings.shared.spec(for: .lastRegion)))

        menu.addItem(.separator())
        menu.addItem(item(title: "Open image from file…", action: #selector(openImageFile), hotkey: nil))
        menu.addItem(item(title: "Open last screenshot in Finder", action: #selector(revealLast), hotkey: nil))

        menu.addItem(.separator())
        let destinationItem = NSMenuItem(title: "Default destination", action: nil, keyEquivalent: "")
        destinationItem.submenu = destinationMenu()
        menu.addItem(destinationItem)
        menu.addItem(item(title: "Preferences…", action: #selector(showPreferences), hotkey: nil))

        menu.addItem(.separator())
        menu.addItem(item(title: "About GreenshotMac", action: #selector(showAbout), hotkey: nil))
        menu.addItem(item(title: "Quit GreenshotMac", action: #selector(quit), hotkey: nil))
        return menu
    }

    private func destinationMenu() -> NSMenu {
        let menu = NSMenu()
        for destination in DestinationID.allCases {
            let menuItem = NSMenuItem(title: destination.title,
                                      action: #selector(selectDestination(_:)),
                                      keyEquivalent: "")
            menuItem.target = self
            menuItem.representedObject = destination.rawValue
            menuItem.state = Configuration.shared.defaultDestination == destination ? .on : .off
            menu.addItem(menuItem)
        }
        return menu
    }

    private func item(title: String, action: Selector, hotkey: HotkeySpec?) -> NSMenuItem {
        let menuItem = NSMenuItem(title: title, action: action, keyEquivalent: "")
        menuItem.target = self
        if let hotkey, !hotkey.isEmpty {
            menuItem.toolTip = HotkeyManager.description(of: hotkey)
        }
        return menuItem
    }

    func menuWillOpen(_ menu: NSMenu) {
        for menuItem in menu.items where menuItem.title == "Default destination" {
            menuItem.submenu = destinationMenu()
        }
        if let revealItem = menu.items.first(where: { $0.title == "Open last screenshot in Finder" }) {
            revealItem.isEnabled = Notifier.mostRecentSavedURL != nil
        }
    }

    // MARK: - Actions

    @objc private func captureRegion() { CaptureCoordinator.shared.captureRegion() }
    @objc private func captureWindow() { CaptureCoordinator.shared.captureWindow() }
    @objc private func captureFullscreen() { CaptureCoordinator.shared.captureFullscreen() }
    @objc private func captureLastRegion() { CaptureCoordinator.shared.captureLastRegion() }
    @objc private func openImageFile() { CaptureCoordinator.shared.openImageFile() }
    @objc private func revealLast() { Notifier.revealMostRecent() }

    @objc private func selectDestination(_ sender: NSMenuItem) {
        guard let raw = sender.representedObject as? String,
              let destination = DestinationID(rawValue: raw) else { return }
        Configuration.shared.defaultDestination = destination
    }

    @objc private func showPreferences() {
        if preferencesController == nil {
            preferencesController = PreferencesWindowController()
        }
        preferencesController?.showWindow(nil)
        preferencesController?.window?.makeKeyAndOrderFront(nil)
        NSApp.activate(ignoringOtherApps: true)
    }

    @objc private func showAbout() {
        NSApp.activate(ignoringOtherApps: true)
        NSApp.orderFrontStandardAboutPanel(options: [
            .applicationName: "GreenshotMac",
            .credits: NSAttributedString(
                string: "A native macOS screenshot tool modelled on Greenshot for Windows.\n"
                      + "Licensed under the GNU General Public License v3.",
                attributes: [.font: NSFont.systemFont(ofSize: 11)])
        ])
    }

    @objc private func quit() {
        NSApp.terminate(nil)
    }
}