import AppKit

final class StatusItemController {
    struct Actions {
        let onLeftClick: () -> Void
        let onToggleStatusBar: () -> Void
        let onToggleAppWindow: () -> Void
        let onRefresh: () -> Void
        let onQuit: () -> Void
    }

    private var statusItem: NSStatusItem?
    private let actions: Actions
    private var stateStatusBarVisible: Bool = true
    private var stateAppWindowVisible: Bool = false

    init(actions: Actions) {
        self.actions = actions
        createStatusItemIfNeeded()
    }

    func setState(statusBarVisible: Bool, appWindowVisible: Bool) {
        self.stateStatusBarVisible = statusBarVisible
        self.stateAppWindowVisible = appWindowVisible
    }

    func hideStatusItem() {
        if let item = statusItem {
            NSStatusBar.system.removeStatusItem(item)
            statusItem = nil
        }
    }

    func showStatusItem() {
        createStatusItemIfNeeded()
    }

    var isVisible: Bool { statusItem != nil }

    private func createStatusItemIfNeeded() {
        guard statusItem == nil else { return }
        let item = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)
        statusItem = item
        if let button = item.button {
            let font = NSFont.monospacedSystemFont(ofSize: 13, weight: .bold)
            button.image = nil
            button.attributedTitle = NSAttributedString(string: "P", attributes: [ .font: font ])
            button.target = self
            button.action = #selector(handleClick)
            button.sendAction(on: [.leftMouseUp, .rightMouseUp])
            button.toolTip = "ProleStatus"
        }
    }

    @objc private func handleClick(_ sender: Any?) {
        guard let event = NSApp.currentEvent else {
            actions.onLeftClick(); return
        }
        switch event.type {
        case .rightMouseUp:
            showMenu()
        default:
            actions.onLeftClick()
        }
    }

    private func showMenu() {
        guard let button = statusItem?.button else { return }
        let menu = NSMenu(title: "ProleStatus")

        let statusBarTitle = stateStatusBarVisible ? "Hide Status Bar Icon" : "Show Status Bar Icon"
        let appWindowTitle = stateAppWindowVisible ? "Hide Application Window" : "Show Application Window"

        let sbItem = NSMenuItem(title: statusBarTitle, action: #selector(toggleStatusBar), keyEquivalent: "")
        sbItem.target = self
        menu.addItem(sbItem)

        let winItem = NSMenuItem(title: appWindowTitle, action: #selector(toggleAppWindow), keyEquivalent: "")
        winItem.target = self
        menu.addItem(winItem)

        menu.addItem(.separator())

        let refreshItem = NSMenuItem(title: "Refresh Now", action: #selector(refreshNow), keyEquivalent: "r")
        refreshItem.target = self
        menu.addItem(refreshItem)

        menu.addItem(.separator())

        let quitItem = NSMenuItem(title: "Quit ProleStatus", action: #selector(quitApp), keyEquivalent: "q")
        quitItem.target = self
        menu.addItem(quitItem)

        let point = NSPoint(x: 0, y: button.bounds.minY - 3)
        menu.popUp(positioning: nil, at: point, in: button)
    }

    @objc private func toggleStatusBar() { actions.onToggleStatusBar() }
    @objc private func toggleAppWindow() { actions.onToggleAppWindow() }
    @objc private func refreshNow() { actions.onRefresh() }
    @objc private func quitApp() { actions.onQuit() }
}