//
//  helpers.swift
//  Stats
//
//  Created by Serhiy Mytrovtsiy on 13/07/2020.
//  Using Swift 5.0.
//  Running on macOS 10.15.
//
//  Copyright © 2020 Serhiy Mytrovtsiy. All rights reserved.
//

import Cocoa
import Kit
import UserNotifications

extension AppDelegate {
    internal func parseArguments() {
        let args = CommandLine.arguments
        
        if args.contains("--reset") {
            debug("Receive --reset argument. Resetting store (UserDefaults)...")
            Store.shared.reset()
        }
        
        if let disableIndex = args.firstIndex(of: "--disable") {
            if args.indices.contains(disableIndex+1) {
                let disableModules = args[disableIndex+1].split(separator: ",")
                
                disableModules.forEach { (moduleName: Substring) in
                    if let module = modules.first(where: { $0.config.name.lowercased() == moduleName.lowercased()}) {
                        module.unmount()
                    }
                }
            }
        }
        
        if let mountIndex = args.firstIndex(of: "--mount-path") {
            if args.indices.contains(mountIndex+1) {
                let mountPath = args[mountIndex+1]
                asyncShell("/usr/bin/hdiutil detach \(mountPath)")
                asyncShell("/bin/rm -rf \(mountPath)")
                
                debug("DMG was unmounted and mountPath deleted")
            }
        }
        
        if let dmgIndex = args.firstIndex(of: "--dmg-path") {
            if args.indices.contains(dmgIndex+1) {
                asyncShell("/bin/rm -rf \(args[dmgIndex+1])")
                
                debug("DMG was deleted")
            }
        }
    }
    
    internal func parseVersion() {
        let key = "version"
        let currentVersion = Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") as! String
        guard let updateInterval = AppUpdateInterval(rawValue: Store.shared.string(key: "update-interval", defaultValue: AppUpdateInterval.silent.rawValue)) else {
            return
        }
        
        if !Store.shared.exist(key: key) {
            Store.shared.reset()
            debug("Previous version not detected. Current version (\(currentVersion) set")
        } else {
            let prevVersion = Store.shared.string(key: key, defaultValue: "")
            if prevVersion == currentVersion {
                return
            }
            
            if updateInterval != .silent && isNewestVersion(currentVersion: prevVersion, latestVersion: currentVersion) {
                let title: String = localizedString("Successfully updated")
                let subtitle: String = localizedString("Stats was updated to v", currentVersion)
                
                let id = showNotification(title: title, subtitle: subtitle, delegate: self)
                DispatchQueue.main.asyncAfter(deadline: .now() + 10) {
                    removeNotification(id)
                }
            }
            
            debug("Detected previous version \(prevVersion). Current version (\(currentVersion) set")
        }
        
        Store.shared.set(key: key, value: currentVersion)
    }
    
    internal func defaultValues() {
        if Store.shared.exist(key: "runAtLoginInitialized") {
            LaunchAtLogin.migrate()
        }
        
        if Store.shared.exist(key: "dockIcon") {
            let dockIconStatus = Store.shared.bool(key: "dockIcon", defaultValue: false) ? NSApplication.ActivationPolicy.regular : NSApplication.ActivationPolicy.accessory
            NSApp.setActivationPolicy(dockIconStatus)
        }
        
        self.checkIfShouldShowSupportWindow()
        self.supportActivity.interval = 60 * 60 * 24 * 30
        self.supportActivity.repeats = true
        self.supportActivity.schedule { (completion: @escaping NSBackgroundActivityScheduler.CompletionHandler) in
            DispatchQueue.main.async {
                self.checkIfShouldShowSupportWindow()
            }
            completion(NSBackgroundActivityScheduler.Result.finished)
        }
        
        if let updateInterval = AppUpdateInterval(rawValue: Store.shared.string(key: "update-interval", defaultValue: AppUpdateInterval.silent.rawValue)) {
            self.updateActivity.invalidate()
            self.updateActivity.repeats = true
            
            debug("Application update interval is '\(updateInterval.rawValue)'")
            
            switch updateInterval {
            case .oncePerDay: self.updateActivity.interval = 60 * 60 * 24
            case .oncePerWeek: self.updateActivity.interval = 60 * 60 * 24 * 7
            case .oncePerMonth: self.updateActivity.interval = 60 * 60 * 24 * 30
            case .atStart:
                self.checkForNewVersion()
                return
            case .silent:
                self.checkForNewVersion(silent: true)
                return
            default: return
            }
            
            self.updateActivity.schedule { (completion: @escaping NSBackgroundActivityScheduler.CompletionHandler) in
                self.checkForNewVersion()
                completion(NSBackgroundActivityScheduler.Result.finished)
            }
        }
    }
    
    internal func setup(completion: @escaping () -> Void) {
        if Store.shared.exist(key: "setupProcess") || Store.shared.exist(key: "runAtLoginInitialized") {
            completion()
            return
        }
        
        debug("showing the setup window")
        
        self.setupWindow.show()
        self.setupWindow.finishHandler = {
            debug("setup is finished, starting the app")
            completion()
        }
        Store.shared.set(key: "setupProcess", value: true)
    }
    
    internal func checkForNewVersion(silent: Bool = false) {
        updater.check { result, error in
            if error != nil {
                debug("error updater.check(): \(error!.localizedDescription)")
                return
            }
            
            guard error == nil, let version: version_s = result else {
                debug("download error(): \(error!.localizedDescription)")
                return
            }
            
            if !version.newest {
                return
            }
            
            if silent {
                if let url = URL(string: version.url) {
                    updater.download(url, completion: { path in
                        updater.install(path: path) { error in
                            if let error {
                                showAlert("Error update Stats", error, .critical)
                            }
                        }
                    })
                }
                return
            }
            
            debug("show update view because new version of app found: \(version.latest)")
            
            let center = UNUserNotificationCenter.current()
            center.getNotificationSettings { settings in
                switch settings.authorizationStatus {
                case .authorized, .provisional:
                    self.showUpdateNotification(version: version)
                case .denied:
                    self.showUpdateWindow(version: version)
                case .notDetermined:
                    center.requestAuthorization(options: [.sound, .alert, .badge], completionHandler: { (_, error) in
                        if error == nil {
                            NSApplication.shared.registerForRemoteNotifications()
                            self.showUpdateNotification(version: version)
                        } else {
                            self.showUpdateWindow(version: version)
                        }
                    })
                @unknown default:
                    self.showUpdateWindow(version: version)
                    error_msg("unknown notification setting")
                }
            }
        }
    }
    
    func checkIfShouldShowSupportWindow() {
        if !Store.shared.exist(key: "setupProcess") || !Store.shared.exist(key: "runAtLoginInitialized") {
            return
        }
        
        let now = Int(Date().timeIntervalSince1970)
        if !Store.shared.exist(key: "support_ts") {
            Store.shared.set(key: "support_ts", value: now)
            self.supportWindow.show()
            return
        }
        
        let lastShow = Store.shared.int(key: "support_ts", defaultValue: now)
        let diff = (now - lastShow) / (60 * 60 * 24)
        if diff <= 31 {
            debug("The support window was shown \(diff) days ago, stopping...")
            return
        }
        
        Store.shared.set(key: "support_ts", value: now)
        self.supportWindow.show()
    }
    
    private func showUpdateNotification(version: version_s) {
        debug("show update notification")
        _ = showNotification(
            title: localizedString("New version available"),
            subtitle: localizedString("Click to install the new version of Stats"),
            userInfo: ["url": version.url],
            delegate: self
        )
    }
    
    private func showUpdateWindow(version: version_s) {
        debug("show update window")
        
        DispatchQueue.main.async(execute: {
            self.updateWindow.open(version)
        })
    }
    
    @objc internal func listenForAppPause() {
        for m in modules {
            if self.pauseState && m.enabled {
                m.disable()
            } else if !self.pauseState && !m.enabled && Store.shared.bool(key: "\(m.config.name)_state", defaultValue: m.config.defaultState) {
                m.enable()
            }
        }
        self.icon()
    }
    
    internal func icon() {
        if self.pauseState {
            self.menuBarItem = NSStatusBar.system.statusItem(withLength: AppIcon.size.width)
            DispatchQueue.main.async(execute: {
                self.menuBarItem?.autosaveName = "Stats"
            })
            self.menuBarItem?.button?.addSubview(AppIcon())
            
            self.menuBarItem?.button?.target = self
            self.menuBarItem?.button?.action = #selector(self.openSettings)
            self.menuBarItem?.button?.sendAction(on: [.leftMouseDown, .rightMouseDown])
        } else {
            if let item = self.menuBarItem {
                NSStatusBar.system.removeStatusItem(item)
            }
            self.menuBarItem = nil
        }
    }
    
    @objc internal func openSettings() {
        NotificationCenter.default.post(name: .toggleSettings, object: nil, userInfo: ["module": "Dashboard"])
    }
    
    internal func handleKeyEvent(_ event: NSEvent) {
        var keyCodes: [UInt16] = []
        if event.modifierFlags.contains(.control) { keyCodes.append(59) }
        if event.modifierFlags.contains(.shift) { keyCodes.append(60) }
        if event.modifierFlags.contains(.command) { keyCodes.append(55) }
        if event.modifierFlags.contains(.option) { keyCodes.append(58) }
        keyCodes.append(event.keyCode)
        
        guard !keyCodes.isEmpty,
              let module = modules.first(where: { $0.enabled && $0.popupKeyboardShortcut == keyCodes }),
              let widget = module.menuBar.widgets.filter({ $0.isActive }).first,
              let window = widget.item.window else { return }
        
        NotificationCenter.default.post(name: .togglePopup, object: nil, userInfo: [
            "module": module.name,
            "widget": widget.type,
            "origin": window.frame.origin,
            "center": window.frame.width/2
        ])
    }
}