//
//  AppDelegate.swift
//  Logger4
//
//  Created by Kilian Hofmann on 15.06.17.
//  Copyright © 2017 Kilian Hofmann. All rights reserved.
//
// Folder Structure "~/KDLog/YEAR.docsisplist2/MONTH/DAY/FILE"
//

import Cocoa

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    // MARK: - Things that have to be kept alive for the application lifetime
    // lock for mutex access to files
    var lock: pthread_mutex_t = pthread_mutex_t()
    // Date formaters
    let justDate: DateFormatter = DateFormatter()
    let justTime: DateFormatter = DateFormatter()
    // Status Item
    var statusItem: NSStatusItem = NSStatusItem()
    // URL Session for DOCSIS data and Internet check
    let urlSession: URLSession = URLSession(configuration: .default)
    // Preferences
    let pref: NSWindowController = NSWindowController(windowNibName: "SettingsWindowController")
    // Timers
    var timerFreqs: Timer = Timer()
    var timerFails: Timer = Timer()

    // MARK: - Application Lifecycle
    
    func applicationDidFinishLaunching(_ aNotification: Notification) {
        // Show Preferneces if defaults are empty
        UserDefaults.standard.register(defaults: ["upstream" : "", "downstream" : ""])
        if UserDefaults.standard.string(forKey: "upstream") == nil || UserDefaults.standard.string(forKey: "downstream") == nil {
            pref.showWindow(nil)
        }
        
        // Init lock
        pthread_mutex_init(&((NSApp.delegate as! AppDelegate).lock), nil)
        
        // Setup date formatters
        justDate.dateStyle = DateFormatter.Style.medium
        justDate.timeStyle = DateFormatter.Style.none
        justDate.locale = Locale(identifier: "de_DE")
        
        justTime.dateStyle = .none
        justTime.timeStyle = .medium
        justTime.timeZone = NSTimeZone.local
        justTime.locale = Locale(identifier: "de_DE")
        
        // Set status item
        statusItem = NSStatusBar.system.statusItem(withLength: -2)
        statusItem.title = "AL"
        // Create status item menu
        let menu: NSMenu = NSMenu.init()
        menu.autoenablesItems = false
        let menuAbout: NSMenuItem = NSMenuItem(title: "About Logger", action: #selector(NSApp.orderFrontStandardAboutPanel(_:)), keyEquivalent: "")
        let menuQuit: NSMenuItem = NSMenuItem.init(title: "Quit", action: #selector(NSApp.terminate(_:)), keyEquivalent: "q")
        let menuPref: NSMenuItem = NSMenuItem(title: "Preferences", action: #selector(self.preferences(_:)), keyEquivalent: "")
        menuPref.image = NSImage(named: NSImage.actionTemplateName)
        // Layout menu
        menu.addItem(menuAbout)
        menu.addItem(NSMenuItem.separator())
        menu.addItem(menuPref)
        menu.addItem(NSMenuItem.separator())
        menu.addItem(menuQuit)
        // Add menu
        statusItem.menu = menu
        
        // Check if directory exists, create or exit
        let fileManager = FileManager.default
        var directory: ObjCBool = ObjCBool(false)
        pthread_mutex_lock(&((NSApp.delegate as! AppDelegate).lock))
        let exists: Bool = fileManager.fileExists(atPath: ("~/KDLog" as NSString).expandingTildeInPath, isDirectory: &directory)
        if exists && directory.boolValue {
        } else if exists {
            NSLog("FILE WITH NAME KDLog EXISTS, REMOVE IT")
            exit(1);
        }
        else {
            do {
                try fileManager.createDirectory(atPath: ("~/KDLog" as NSString).expandingTildeInPath, withIntermediateDirectories: false, attributes: nil)
            }
            catch let error as NSError {
                NSLog("ERROR ON DIRECTORY CREATION: \(error.localizedDescription)")
                exit(1);
            }
        }
        pthread_mutex_unlock(&((NSApp.delegate as! AppDelegate).lock))
        
        // Init timers
        if UserDefaults.standard.string(forKey: "upstream") != nil || UserDefaults.standard.string(forKey: "downstream") != nil {
            initTimers()
        }
    }

    func applicationShouldTerminate(_ sender: NSApplication) -> NSApplication.TerminateReply {
        urlSession.invalidateAndCancel()
        return .terminateNow
    }
    
    // MARK: - Logging Functions
    
    @objc func logFreqs(_: Timer) {
        let frequencyOperation: FrequencyOperation = FrequencyOperation()
        OperationQueue.main.addOperation(frequencyOperation)
    }
    
    @objc func logFails(_: Timer) {
        let connectionLossOperation: ConnectionLossOperation = ConnectionLossOperation()
        OperationQueue.main.addOperation(connectionLossOperation)
    }
    
    // MARK: - General functions
    
    @objc func preferences(_ sender: NSMenuItem) {
        timerFreqs.invalidate()
        timerFails.invalidate()
        
        pref.showWindow(sender)
        pref.window?.makeKeyAndOrderFront(self)
    }
    
    func initTimers() {
        timerFreqs.invalidate()
        timerFails.invalidate()
        
        timerFreqs = Timer.scheduledTimer(timeInterval: 10, target: self, selector: #selector(logFreqs), userInfo: nil, repeats: true)
        timerFails = Timer.scheduledTimer(timeInterval: 60, target: self, selector: #selector(logFails), userInfo: nil, repeats: true)
    }
    
    @IBAction func close(_ sender: NSButton){
        initTimers()
        sender.superview?.window?.close()
    }
}