//
//  AppDelegate.swift
//  ShadowsocksX-NG
//
//  Created by 邱宇舟 on 16/6/5.
//  Copyright © 2016年 qiuyuzhou. All rights reserved.
//

import Cocoa
import Carbon
import RxCocoa
import RxSwift

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate, NSUserNotificationCenterDelegate {
    
    var qrcodeWinCtrl: SWBQRCodeWindowController!
    var preferencesWinCtrl: PreferencesWindowController!
    var editUserRulesWinCtrl: UserRulesController!
    var allInOnePreferencesWinCtrl: PreferencesWinController!

    var launchAtLoginController: LaunchAtLoginController = LaunchAtLoginController()
    
    @IBOutlet weak var window: NSWindow!
    @IBOutlet weak var statusMenu: NSMenu!
    
    @IBOutlet weak var runningStatusMenuItem: NSMenuItem!
    @IBOutlet weak var toggleRunningMenuItem: NSMenuItem!
    @IBOutlet weak var autoModeMenuItem: NSMenuItem!
    @IBOutlet weak var globalModeMenuItem: NSMenuItem!
    @IBOutlet weak var manualModeMenuItem: NSMenuItem!
    
    @IBOutlet weak var serversMenuItem: NSMenuItem!
    @IBOutlet var showQRCodeMenuItem: NSMenuItem!
    @IBOutlet var scanQRCodeMenuItem: NSMenuItem!
    @IBOutlet var showBunchJsonExampleFileItem: NSMenuItem!
    @IBOutlet var importBunchJsonFileItem: NSMenuItem!
    @IBOutlet var exportAllServerProfileItem: NSMenuItem!
    @IBOutlet var serversPreferencesMenuItem: NSMenuItem!
    
    @IBOutlet weak var copyHttpProxyExportCmdLineMenuItem: NSMenuItem!
    
    @IBOutlet weak var lanchAtLoginMenuItem: NSMenuItem!

    @IBOutlet weak var hudWindow: NSPanel!
    @IBOutlet weak var panelView: NSView!
    @IBOutlet weak var isNameTextField: NSTextField!

    let kHudFadeInDuration: Double = 0.25
    let kHudFadeOutDuration: Double = 0.5
    let kHudDisplayDuration: Double = 2.0

    let kHudAlphaValue: CGFloat = 0.75
    let kHudCornerRadius: CGFloat = 18.0
    let kHudHorizontalMargin: CGFloat = 30
    let kHudHeight: CGFloat = 90.0
    
    let kProfileMenuItemIndexBase = 100

    var timerToFadeOut: Timer? = nil
    var fadingOut: Bool = false

    var statusItem: NSStatusItem!
    
    static let StatusItemIconWidth:CGFloat = 20
    
    func applicationDidFinishLaunching(_ aNotification: Notification) {
        // Insert code here to initialize your application
        
        NSUserNotificationCenter.default.delegate = self
        
        // Prepare ss-local
        InstallSSLocal()
        InstallKcptunClient()
        InstallPrivoxy()
        // Prepare defaults
        let defaults = UserDefaults.standard
        defaults.register(defaults: [
            "ShadowsocksOn": true,
            "ShadowsocksRunningMode": "auto",
            "LocalSocks5.ListenPort": NSNumber(value: 1086 as UInt16),
            "LocalSocks5.ListenAddress": "127.0.0.1",
            "PacServer.ListenPort":NSNumber(value: 1089 as UInt16),
            "LocalSocks5.Timeout": NSNumber(value: 60 as UInt),
            "LocalSocks5.EnableUDPRelay": NSNumber(value: false as Bool),
            "LocalSocks5.EnableVerboseMode": NSNumber(value: false as Bool),
            "GFWListURL": "https://raw.githubusercontent.com/gfwlist/gfwlist/master/gfwlist.txt",
            "AutoConfigureNetworkServices": NSNumber(value: true as Bool),
            "LocalHTTP.ListenAddress": "127.0.0.1",
            "LocalHTTP.ListenPort": NSNumber(value: 1087 as UInt16),
            "LocalHTTPOn": true,
            "LocalHTTP.FollowGlobal": true,
            "Kcptun.LocalHost": "127.0.0.1",
            "Kcptun.LocalPort": NSNumber(value: 8388),
            "Kcptun.Conn": NSNumber(value: 1),
            "ShowRunningModeOnStatusBar": true,
            ])
        
        statusItem = NSStatusBar.system().statusItem(withLength: AppDelegate.StatusItemIconWidth)
        let image = NSImage(named: "menu_icon")
        image?.isTemplate = true
        statusItem.image = image
        statusItem.menu = statusMenu
        
        
        _ = defaults.rx.observe(Bool.self, "ShowRunningModeOnStatusBar")
//            .distinctUntilChanged()
            .subscribe(onNext: { value in
                if let enabled = value {
                    self.updateStatusItemUI(isShownnRunningMode: enabled)
                }
            })
        
        let notifyCenter = NotificationCenter.default
        
        _ = notifyCenter.rx.notification(NOTIFY_CONF_CHANGED)
            .subscribe(onNext: { noti in
                SyncSSLocal()
                self.applyConfig()
                self.updateCopyHttpProxyExportMenu()
            })
        
        notifyCenter.addObserver(forName: NSNotification.Name(rawValue: NOTIFY_SERVER_PROFILES_CHANGED), object: nil, queue: nil
            , using: {
                (note) in
                let profileMgr = ServerProfileManager.instance
                if profileMgr.activeProfileId == nil &&
                    profileMgr.profiles.count > 0{
                    if profileMgr.profiles[0].isValid(){
                        profileMgr.setActiveProfiledId(profileMgr.profiles[0].uuid)
                    }
                }
                self.updateServersMenu()
                self.updateRunningModeMenu()
                SyncSSLocal()
            }
        )
        _ = notifyCenter.rx.notification(NOTIFY_TOGGLE_RUNNING_SHORTCUT)
            .subscribe(onNext: { noti in
                self.doToggleRunning(showToast: true)
            })
        _ = notifyCenter.rx.notification(NOTIFY_SWITCH_PROXY_MODE_SHORTCUT)
            .subscribe(onNext: { noti in
                let mode = defaults.string(forKey: "ShadowsocksRunningMode")!
                switch mode {
                case "auto":
                    defaults.setValue("global", forKey: "ShadowsocksRunningMode")
                    self.isNameTextField.stringValue = "Global Mode".localized
                case "global":
                    defaults.setValue("auto", forKey: "ShadowsocksRunningMode")
                    self.isNameTextField.stringValue = "Auto Mode By PAC".localized
                default:
                    defaults.setValue("auto", forKey: "ShadowsocksRunningMode")
                    self.isNameTextField.stringValue = "Auto Mode By PAC".localized
                }
                
                self.updateRunningModeMenu()
                self.applyConfig()
                self.fadeInHud()
            })
        
        _ = notifyCenter.rx.notification(NOTIFY_FOUND_SS_URL)
            .subscribe(onNext: { noti in
                self.handleFoundSSURL(noti)
            })
        
        // Handle ss url scheme
        NSAppleEventManager.shared().setEventHandler(self
            , andSelector: #selector(self.handleURLEvent)
            , forEventClass: AEEventClass(kInternetEventClass), andEventID: AEEventID(kAEGetURL))
        
        updateMainMenu()
        updateCopyHttpProxyExportMenu()
        updateServersMenu()
        updateRunningModeMenu()
        
        ProxyConfHelper.install()
        ProxyConfHelper.startMonitorPAC()
        applyConfig()

        // Register global hotkey
        ShortcutsController.bindShortcuts()
    }
    
    func applicationWillTerminate(_ aNotification: Notification) {
        // Insert code here to tear down your application
        StopSSLocal()
        StopKcptun()
        StopPrivoxy()
        ProxyConfHelper.disableProxy()
    }

    func applyConfig() {
        SyncSSLocal()
        
        let defaults = UserDefaults.standard
        let isOn = defaults.bool(forKey: "ShadowsocksOn")
        let mode = defaults.string(forKey: "ShadowsocksRunningMode")
        
        if isOn {
            if mode == "auto" {
                ProxyConfHelper.enablePACProxy()
            } else if mode == "global" {
                ProxyConfHelper.enableGlobalProxy()
            } else if mode == "manual" {
                ProxyConfHelper.disableProxy()
            }
        } else {
            ProxyConfHelper.disableProxy()
        }
    }

    // MARK: - UI Methods
    @IBAction func toggleRunning(_ sender: NSMenuItem) {
        self.doToggleRunning(showToast: false)
    }
    
    func doToggleRunning(showToast: Bool) {
        let defaults = UserDefaults.standard
        var isOn = UserDefaults.standard.bool(forKey: "ShadowsocksOn")
        isOn = !isOn
        defaults.set(isOn, forKey: "ShadowsocksOn")
        
        self.updateMainMenu()
        self.applyConfig()
        
        if showToast {
            if isOn {
                self.isNameTextField.stringValue = "Shadowsocks: On".localized
            }
            else {
                self.isNameTextField.stringValue = "Shadowsocks: Off".localized
            }
            self.fadeInHud()
        }
    }
    
    @IBAction func updateGFWList(_ sender: NSMenuItem) {
        UpdatePACFromGFWList()
    }
    
    @IBAction func editUserRulesForPAC(_ sender: NSMenuItem) {
        if editUserRulesWinCtrl != nil {
            editUserRulesWinCtrl.close()
        }
        let ctrl = UserRulesController(windowNibName: "UserRulesController")
        editUserRulesWinCtrl = ctrl
        
        ctrl.showWindow(self)
        NSApp.activate(ignoringOtherApps: true)
        ctrl.window?.makeKeyAndOrderFront(self)
    }
    
    @IBAction func showQRCodeForCurrentServer(_ sender: NSMenuItem) {
        var errMsg: String?
        if let profile = ServerProfileManager.instance.getActiveProfile() {
            if profile.isValid() {
                // Show window
                if qrcodeWinCtrl != nil{
                    qrcodeWinCtrl.close()
                }
                qrcodeWinCtrl = SWBQRCodeWindowController(windowNibName: "SWBQRCodeWindowController")
                qrcodeWinCtrl.qrCode = profile.URL()!.absoluteString
                qrcodeWinCtrl.showWindow(self)
                NSApp.activate(ignoringOtherApps: true)
                qrcodeWinCtrl.window?.makeKeyAndOrderFront(nil)
                
                return
            } else {
                errMsg = "Current server profile is not valid.".localized
            }
        } else {
            errMsg = "No current server profile.".localized
        }
        let userNote = NSUserNotification()
        userNote.title = errMsg
        userNote.soundName = NSUserNotificationDefaultSoundName
        
        NSUserNotificationCenter.default
            .deliver(userNote);
    }
    
    @IBAction func scanQRCodeFromScreen(_ sender: NSMenuItem) {
        ScanQRCodeOnScreen()
    }
    
    @IBAction func showBunchJsonExampleFile(sender: NSMenuItem) {
        ServerProfileManager.showExampleConfigFile()
    }
    
    @IBAction func importBunchJsonFile(sender: NSMenuItem) {
        ServerProfileManager.instance.importConfigFile()
        //updateServersMenu()//not working
    }
    
    @IBAction func exportAllServerProfile(sender: NSMenuItem) {
        ServerProfileManager.instance.exportConfigFile()
    }

    @IBAction func selectPACMode(_ sender: NSMenuItem) {
        let defaults = UserDefaults.standard
        defaults.setValue("auto", forKey: "ShadowsocksRunningMode")
        updateRunningModeMenu()
        applyConfig()
    }
    
    @IBAction func selectGlobalMode(_ sender: NSMenuItem) {
        let defaults = UserDefaults.standard
        defaults.setValue("global", forKey: "ShadowsocksRunningMode")
        updateRunningModeMenu()
        applyConfig()
    }
    
    @IBAction func selectManualMode(_ sender: NSMenuItem) {
        let defaults = UserDefaults.standard
        defaults.setValue("manual", forKey: "ShadowsocksRunningMode")
        updateRunningModeMenu()
        applyConfig()
    }
    
    @IBAction func editServerPreferences(_ sender: NSMenuItem) {
        if preferencesWinCtrl != nil {
            preferencesWinCtrl.close()
        }
        let ctrl = PreferencesWindowController(windowNibName: "PreferencesWindowController")
        preferencesWinCtrl = ctrl
        
        ctrl.showWindow(self)
        NSApp.activate(ignoringOtherApps: true)
        ctrl.window?.makeKeyAndOrderFront(self)
    }
    
    @IBAction func showAllInOnePreferences(_ sender: NSMenuItem) {
        if allInOnePreferencesWinCtrl != nil {
            allInOnePreferencesWinCtrl.close()
        }
        
        allInOnePreferencesWinCtrl = PreferencesWinController(windowNibName: "PreferencesWinController")
        
        allInOnePreferencesWinCtrl.showWindow(self)
        NSApp.activate(ignoringOtherApps: true)
        allInOnePreferencesWinCtrl.window?.makeKeyAndOrderFront(self)
    }
    
    @IBAction func selectServer(_ sender: NSMenuItem) {
        let index = sender.tag - kProfileMenuItemIndexBase
        let spMgr = ServerProfileManager.instance
        let newProfile = spMgr.profiles[index]
        if newProfile.uuid != spMgr.activeProfileId {
            spMgr.setActiveProfiledId(newProfile.uuid)
            updateServersMenu()
            SyncSSLocal()
            applyConfig()
        }
        updateRunningModeMenu()
    }
    
    @IBAction func copyExportCommand(_ sender: NSMenuItem) {
        // Get the Http proxy config.
        let defaults = UserDefaults.standard
        let address = defaults.string(forKey: "LocalHTTP.ListenAddress")!
        let port = defaults.integer(forKey: "LocalHTTP.ListenPort")
        
        // Format an export string.
        let command = "export http_proxy=http://\(address):\(port);export https_proxy=http://\(address):\(port);"
        
        // Copy to paste board.
        NSPasteboard.general().clearContents()
        NSPasteboard.general().setString(command, forType: NSStringPboardType)
        
        // Give a system notification.
        let notification = NSUserNotification()
        notification.title = "Export Command Copied.".localized
        NSUserNotificationCenter.default
            .deliver(notification)
    }
    
    @IBAction func showLogs(_ sender: NSMenuItem) {
        let ws = NSWorkspace.shared()
        if let appUrl = ws.urlForApplication(withBundleIdentifier: "com.apple.Console") {
            try! ws.launchApplication(at: appUrl
                ,options: .default
                ,configuration: [NSWorkspaceLaunchConfigurationArguments: "~/Library/Logs/ss-local.log"])
        }
    }
    
    @IBAction func feedback(_ sender: NSMenuItem) {
        NSWorkspace.shared().open(URL(string: "https://github.com/qiuyuzhou/ShadowsocksX-NG/issues")!)
    }
    
    @IBAction func showAbout(_ sender: NSMenuItem) {
        NSApp.orderFrontStandardAboutPanel(sender);
        NSApp.activate(ignoringOtherApps: true)
    }
    
    func updateRunningModeMenu() {
        let defaults = UserDefaults.standard
        let mode = defaults.string(forKey: "ShadowsocksRunningMode")
        
        var serverMenuText = "Servers".localized

        let mgr = ServerProfileManager.instance
        for p in mgr.profiles {
            if mgr.activeProfileId == p.uuid {
                var profileName :String
                if !p.remark.isEmpty {
                    profileName = p.remark
                } else {
                    profileName = p.serverHost
                }
                serverMenuText = "\(serverMenuText) - \(profileName)"
            }
        }
        serversMenuItem.title = serverMenuText
        
        if mode == "auto" {
            autoModeMenuItem.state = 1
            globalModeMenuItem.state = 0
            manualModeMenuItem.state = 0
        } else if mode == "global" {
            autoModeMenuItem.state = 0
            globalModeMenuItem.state = 1
            manualModeMenuItem.state = 0
        } else if mode == "manual" {
            autoModeMenuItem.state = 0
            globalModeMenuItem.state = 0
            manualModeMenuItem.state = 1
        }
        let isShown = defaults.bool(forKey: "ShowRunningModeOnStatusBar")
        updateStatusItemUI(isShownnRunningMode: isShown)
    }
    
    func updateStatusItemUI(isShownnRunningMode: Bool) {
        if isShownnRunningMode {
            let defaults = UserDefaults.standard
            let mode = defaults.string(forKey: "ShadowsocksRunningMode")
            if mode == "auto" {
                statusItem.title = "A"
            } else if mode == "global" {
                statusItem.title = "G"
            } else if mode == "manual" {
                statusItem.title = "M"
            }
            let titleWidth = statusItem.title!.size(withAttributes: [NSFontAttributeName: statusItem.button!.font!]).width
            let imageWidth:CGFloat = AppDelegate.StatusItemIconWidth
            statusItem.length = titleWidth + imageWidth + 2
        } else {
            statusItem.length = AppDelegate.StatusItemIconWidth
        }
    }
    
    func updateMainMenu() {
        let defaults = UserDefaults.standard
        let isOn = defaults.bool(forKey: "ShadowsocksOn")
        if isOn {
            runningStatusMenuItem.title = "Shadowsocks: On".localized
            toggleRunningMenuItem.title = "Turn Shadowsocks Off".localized
            let image = NSImage(named: "menu_icon")
            statusItem.image = image
        } else {
            runningStatusMenuItem.title = "Shadowsocks: Off".localized
            toggleRunningMenuItem.title = "Turn Shadowsocks On".localized
            let image = NSImage(named: "menu_icon_disabled")
            statusItem.image = image
        }
    }
    
    func updateCopyHttpProxyExportMenu() {
        let defaults = UserDefaults.standard
        let isOn = defaults.bool(forKey: "LocalHTTPOn")
        copyHttpProxyExportCmdLineMenuItem.isHidden = !isOn
    }
    
    func updateServersMenu() {
        let mgr = ServerProfileManager.instance
        serversMenuItem.submenu?.removeAllItems()
        let preferencesItem = serversPreferencesMenuItem
        let showBunch = showBunchJsonExampleFileItem
        let importBuntch = importBunchJsonFileItem
        let exportAllServer = exportAllServerProfileItem
        
        serversMenuItem.submenu?.addItem(preferencesItem!)
        serversMenuItem.submenu?.addItem(NSMenuItem.separator())
        
        var i = 0
        for p in mgr.profiles {
            let item = NSMenuItem()
            item.tag = i + kProfileMenuItemIndexBase
            if p.remark.isEmpty {
                item.title = "\(p.serverHost):\(p.serverPort)"
            } else {
                item.title = "\(p.remark) (\(p.serverHost):\(p.serverPort))"
            }
            if mgr.activeProfileId == p.uuid {
                item.state = 1
            }
            if !p.isValid() {
                item.isEnabled = false
            }
            item.action = #selector(AppDelegate.selectServer)
            
            serversMenuItem.submenu?.addItem(item)
            i += 1
        }
        if !mgr.profiles.isEmpty {
            serversMenuItem.submenu?.addItem(NSMenuItem.separator())
        }
        
        serversMenuItem.submenu?.addItem(showBunch!)
        serversMenuItem.submenu?.addItem(importBuntch!)
        serversMenuItem.submenu?.addItem(exportAllServer!)
    }
    
    func handleURLEvent(_ event: NSAppleEventDescriptor, withReplyEvent replyEvent: NSAppleEventDescriptor) {
        if let urlString = event.paramDescriptor(forKeyword: AEKeyword(keyDirectObject))?.stringValue {
            if let url = URL(string: urlString) {
                NotificationCenter.default.post(
                    name: Notification.Name(rawValue: "NOTIFY_FOUND_SS_URL"), object: nil
                    , userInfo: [
                        "urls": [url],
                        "source": "url",
                        ])
            }
        }
    }
    
    func handleFoundSSURL(_ note: Notification) {
        let sendNotify = {
            (title: String, subtitle: String, infoText: String) in
            
            let userNote = NSUserNotification()
            userNote.title = title
            userNote.subtitle = subtitle
            userNote.informativeText = infoText
            userNote.soundName = NSUserNotificationDefaultSoundName
            
            NSUserNotificationCenter.default
                .deliver(userNote);
        }
        
        if let userInfo = (note as NSNotification).userInfo {
            let urls: [URL] = userInfo["urls"] as! [URL]
            
            let mgr = ServerProfileManager.instance
            var isChanged = false
            
            for url in urls {
                if let profile = ServerProfile(url: url) {
                    mgr.profiles.append(profile)
                    isChanged = true
                    
                    var subtitle: String = ""
                    if userInfo["source"] as! String == "qrcode" {
                        subtitle = "By scan QR Code".localized
                    } else if userInfo["source"] as! String == "url" {
                        subtitle = "By Handle SS URL".localized
                    }
                    
                    sendNotify("Add Shadowsocks Server Profile".localized, subtitle, "Host: \(profile.serverHost)")
                }
            }
            
            if isChanged {
                mgr.save()
                self.updateServersMenu()
            } else {
                sendNotify("Not found valid qrcode of shadowsocks profile.", "", "")
            }
        }
    }
    
    //------------------------------------------------------------
    // NSUserNotificationCenterDelegate
    
    func userNotificationCenter(_ center: NSUserNotificationCenter
        , shouldPresent notification: NSUserNotification) -> Bool {
        return true
    }
}

extension AppDelegate {
    func fadeInHud() -> Void {
        if timerToFadeOut != nil {
            timerToFadeOut?.invalidate()
            timerToFadeOut = nil
        }

        fadingOut = false

        hudWindow.orderFrontRegardless()

        CATransaction.begin()
        CATransaction.setAnimationDuration(kHudFadeInDuration)
        CATransaction.setCompletionBlock { self.didFadeIn() }
        panelView.layer?.opacity = 1.0
        CATransaction.commit()
    }

    func didFadeIn() -> Void {
        timerToFadeOut = Timer.scheduledTimer(
            timeInterval: kHudDisplayDuration,
            target: self,
            selector: #selector(fadeOutHud),
            userInfo: nil,
            repeats: false)
    }

    func fadeOutHud() -> Void {
        fadingOut = true

        CATransaction.begin()
        CATransaction.setAnimationDuration(kHudFadeOutDuration)
        CATransaction.setCompletionBlock { self.didFadeOut() }
        panelView.layer?.opacity = 0.0
        CATransaction.commit()
    }

    func didFadeOut() -> Void {
        if fadingOut {
            self.hudWindow.orderOut(nil)
        }
        fadingOut = false
    }

    func setupHud() -> Void {
        isNameTextField.stringValue = "Shadowsocks: Off"
        isNameTextField.sizeToFit()

        var labelFrame: CGRect = isNameTextField.frame
        var hudWindowFrame: CGRect = hudWindow.frame
        hudWindowFrame.size.width = labelFrame.size.width + kHudHorizontalMargin * 2
        hudWindowFrame.size.height = kHudHeight

        let screenRect: NSRect = NSScreen.screens()![0].visibleFrame
        hudWindowFrame.origin.x = (screenRect.size.width - hudWindowFrame.size.width) / 2
        hudWindowFrame.origin.y = (screenRect.size.height - hudWindowFrame.size.height) / 2
        hudWindow.setFrame(hudWindowFrame, display: true)

        var viewFrame: NSRect = hudWindowFrame;
        viewFrame.origin.x = 0
        viewFrame.origin.y = 0
        panelView.frame = viewFrame

        labelFrame.origin.x = kHudHorizontalMargin
        labelFrame.origin.y = (hudWindowFrame.size.height - labelFrame.size.height) / 2
        isNameTextField.frame = labelFrame
    }

    func initUIComponent() -> Void {
        hudWindow.isOpaque = false
        hudWindow.backgroundColor = .clear
        hudWindow.level = Int(CGWindowLevelForKey(.utilityWindow)) + 1000
        hudWindow.styleMask = .borderless
        hudWindow.hidesOnDeactivate = false
        hudWindow.collectionBehavior = .canJoinAllSpaces

        let viewLayer: CALayer = CALayer()
        viewLayer.backgroundColor = CGColor.init(red: 0.05, green: 0.05, blue: 0.05, alpha: kHudAlphaValue)
        viewLayer.cornerRadius = kHudCornerRadius
        panelView.wantsLayer = true
        panelView.layer = viewLayer
        panelView.layer?.opacity = 0.0

        setupHud()
    }
    
    override func awakeFromNib() {
        initUIComponent()
    }
}