//
//  AppDelegate.swift
//  Menubar RunCat
//
//  Created by Takuto Nakamura on 2019/08/06.
//  Copyright © 2019 Takuto Nakamura. All rights reserved.
//

import Cocoa

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    @IBOutlet weak var menu: NSMenu!
    
    private let statusItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)
    private let nc = NSWorkspace.shared.notificationCenter
    private var anim = [(Double, [NSImage])]()
    private var cnt: Int = 0
    private var isRunning: Bool = false
    private var interval: Double = 1.0
    private let cpu = CPU()
    private var cpuTimer: Timer? = nil
    private var usage: (value: Double, description: String) = (0.0, "")
    private var isShowUsage: Bool = false
    private var animId: Int = 0
    
    func applicationDidFinishLaunching(_ aNotification: Notification) {
        for (name, len, rate) in [
            ("cat_page", 5, 1.0),
            ("dino", 2, 1.0),
            ("ablobcatbongo", 2, 0.5),
            ("ablobcatcoffee", 24, 0.2),
            ("ablobcatrave", 18, 0.2),
            ("ablobcatwave", 24, 0.4),
            ("ablobattention", 22, 0.2),
            ("ablobblewobble", 15, 0.2),
            ("annoyingdog", 2, 1.0),
        ] {
            let animFrames = (0..<len).map { NSImage(imageLiteralResourceName: "\(name)\($0)") }
            anim.append((rate, animFrames))
        }
        statusItem.menu = menu
        statusItem.button?.imagePosition = .imageRight
        statusItem.button?.image = anim[animId].1[cnt]
        
        startRunning()
    }

    func applicationWillTerminate(_ aNotification: Notification) {
        stopRunning()
    }
    
    func setNotifications() {
        nc.addObserver(self, selector: #selector(AppDelegate.receiveSleepNote),
                       name: NSWorkspace.willSleepNotification, object: nil)
        nc.addObserver(self, selector: #selector(AppDelegate.receiveWakeNote),
                       name: NSWorkspace.didWakeNotification, object: nil)
    }
    
    @objc func receiveSleepNote() {
        stopRunning()
    }
    
    @objc func receiveWakeNote() {
        startRunning()
    }
    
    func startRunning() {
        cpuTimer = Timer.scheduledTimer(withTimeInterval: 5.0, repeats: true, block: { (t) in
            self.usage = self.cpu.usageCPU()
            self.interval = 0.02 * (100 - max(0.0, min(99.0, self.usage.value))) / 6 * self.anim[self.animId].0
            self.statusItem.button?.title = self.isShowUsage ? self.usage.description : ""
        })
        cpuTimer?.fire()
        isRunning = true
        animate()
    }
    
    func stopRunning() {
        isRunning = false
        cpuTimer?.invalidate()
    }

    func animate() {
        statusItem.button?.image = anim[animId].1[cnt]
        cnt = (cnt + 1) % anim[animId].1.count
        if !isRunning { return }
        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + interval) {
            self.animate()
        }
    }
    
    @IBAction func toggleShowUsage(_ sender: NSMenuItem) {
        isShowUsage = sender.state == .off
        sender.state = isShowUsage ? .on : .off
        statusItem.button?.title = isShowUsage ? usage.description : ""
    }

    @IBAction func changeAnimation(_ sender: NSMenuItem) {
        let animation = menu.item(withTag: 10)?.submenu
        for (index, item) in (animation?.items ?? []).enumerated() {
            if item == sender {
                NSLog("%d", index)
                animId = index
                cnt = 0
                item.state = NSControl.StateValue.on
            } else {
                item.state = NSControl.StateValue.off
            }
        }
    }
    
    @IBAction func showAbout(_ sender: Any) {
        NSApp.activate(ignoringOtherApps: true)
        NSApp.orderFrontStandardAboutPanel(nil)
    }

}