// (C) Copyright 2015 Moodle Pty Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import { ApplicationRef, ApplicationInitStatus, Injector, NgZone as NgZoneService, Type } from '@angular/core';
import { Router as RouterService } from '@angular/router';
import { HttpClient } from '@angular/common/http';

import {
    Platform as PlatformService,
    AlertController as AlertControllerService,
    LoadingController as LoadingControllerService,
    ModalController as ModalControllerService,
    ToastController as ToastControllerService,
    GestureController as GestureControllerService,
    ActionSheetController as ActionSheetControllerService,
    NavController as NavControllerService,
    PopoverController as PopoverControllerService,
} from '@ionic/angular';

import { Badge as BadgeService } from '@ionic-native/badge/ngx';
import { Camera as CameraService } from '@ionic-native/camera/ngx';
import { Chooser as ChooserService } from '@ionic-native/chooser/ngx';
import { Clipboard as ClipboardService } from '@ionic-native/clipboard/ngx';
import { Diagnostic as DiagnosticService } from '@ionic-native/diagnostic/ngx';
import { Device as DeviceService } from '@ionic-native/device/ngx';
import { File as FileService } from '@ionic-native/file/ngx';
import { FileOpener as FileOpenerService } from '@ionic-native/file-opener/ngx';
import { FileTransfer as FileTransferService } from '@ionic-native/file-transfer/ngx';
import { Geolocation as GeolocationService } from '@ionic-native/geolocation/ngx';
import { HTTP } from '@ionic-native/http/ngx';
import { InAppBrowser as InAppBrowserService } from '@ionic-native/in-app-browser/ngx';
import { WebView as WebViewService } from '@ionic-native/ionic-webview/ngx';
import { Keyboard as KeyboardService } from '@ionic-native/keyboard/ngx';
import { LocalNotifications as LocalNotificationsService } from '@ionic-native/local-notifications/ngx';
import { Media as MediaService } from '@ionic-native/media/ngx';
import { MediaCapture as MediaCaptureService } from '@ionic-native/media-capture/ngx';
import { Network as NetworkService } from '@ionic-native/network/ngx';
import { Push as PushService } from '@ionic-native/push/ngx';
import { QRScanner as QRScannerService } from '@ionic-native/qr-scanner/ngx';
import { StatusBar as StatusBarService } from '@ionic-native/status-bar/ngx';
import { SplashScreen as SplashScreenService } from '@ionic-native/splash-screen/ngx';
import { SQLite as SQLiteService } from '@ionic-native/sqlite/ngx';
import { WebIntent as WebIntentService } from '@ionic-native/web-intent/ngx';
import { Zip as ZipService } from '@ionic-native/zip/ngx';

import { TranslateService } from '@ngx-translate/core';

/**
 * Injector instance used to resolve singletons.
 */
let singletonsInjector: Injector | null = null;

/**
 * Helper to create a method that proxies calls to the underlying singleton instance.
 */
// eslint-disable-next-line
let createSingletonMethodProxy = (instance: any, method: Function, property: string | number | symbol) => method.bind(instance);

/**
 * Singleton proxy created using the factory method.
 *
 * @see makeSingleton
 */
export type CoreSingletonProxy<Service> = Service & {
    instance: Service;
    setInstance(instance: Service): void;
};

/**
 * Set the injector that will be used to resolve instances in the singletons of this module.
 *
 * @param injector Module injector.
 */
export function setSingletonsInjector(injector: Injector): void {
    singletonsInjector = injector;
}

/**
 * Set the method to create method proxies.
 *
 * @param method Method.
 */
export function setCreateSingletonMethodProxy(method: typeof createSingletonMethodProxy): void {
    createSingletonMethodProxy = method;
}

/**
 * Make a singleton proxy for the given injection token.
 *
 * This method will return an object that will proxy method calls to an underlying service instance. Getters will also be proxied,
 * but these need to be configured manually using the `getters` argument. Most of the time, this proxy can be used directly like
 * you would use a service instance. If you need to get the real service instance, it can be accessed through the `instance`
 * property and it can be set with the `setInstance` method.
 *
 * @param injectionToken Injection token used to resolve the service. This is usually the service class if the provider was
 * defined using a class or the string used in the `provide` key if it was defined using an object.
 * @param getters Getter names to proxy.
 * @return Singleton proxy.
 */
export function makeSingleton<Service extends object = object>( // eslint-disable-line @typescript-eslint/ban-types
    injectionToken: Type<Service> | Type<unknown> | string,
): CoreSingletonProxy<Service> {
    const singleton = {
        setInstance(instance: Service) {
            Object.defineProperty(singleton, 'instance', {
                value: instance,
                configurable: true,
            });
        },
    } as { instance: Service; setInstance(instance: Service) };

    Object.defineProperty(singleton, 'instance', {
        get: () => {
            if (!singletonsInjector) {
                throw new Error('Can\'t resolve a singleton instance without an injector');
            }

            const instance = singletonsInjector.get(injectionToken);

            singleton.setInstance(instance);

            return instance;
        },
        configurable: true,
    });

    return new Proxy(singleton, {
        get(target, property, receiver) {
            if (property in target) {
                return Reflect.get(target, property, receiver);
            }

            const value = target.instance[property];

            return typeof value === 'function'
                ? createSingletonMethodProxy(target.instance, value, property)
                : value;
        },
        set(target, property, value, receiver) {
            Reflect.set(target.instance, property, value, receiver);

            return true;
        },
    }) as CoreSingletonProxy<Service>;
}

// Convert ionic-native services to singleton.
export const Badge = makeSingleton(BadgeService);
export const Chooser = makeSingleton(ChooserService);
export const Clipboard = makeSingleton(ClipboardService);
export const Diagnostic = makeSingleton(DiagnosticService);
export const File = makeSingleton(FileService);
export const FileOpener = makeSingleton(FileOpenerService);
export const FileTransfer = makeSingleton(FileTransferService);
export const Geolocation = makeSingleton(GeolocationService);
export const InAppBrowser = makeSingleton(InAppBrowserService);
export const Keyboard = makeSingleton(KeyboardService);
export const LocalNotifications = makeSingleton(LocalNotificationsService);
export const Media = makeSingleton(MediaService);
export const MediaCapture = makeSingleton(MediaCaptureService);
export const NativeHttp = makeSingleton(HTTP);
export const Network = makeSingleton(NetworkService);
export const Push = makeSingleton(PushService);
export const QRScanner = makeSingleton(QRScannerService);
export const StatusBar = makeSingleton(StatusBarService);
export const SplashScreen = makeSingleton(SplashScreenService);
export const SQLite = makeSingleton(SQLiteService);
export const WebIntent = makeSingleton(WebIntentService);
export const WebView = makeSingleton(WebViewService);
export const Zip = makeSingleton(ZipService);

export const Camera = makeSingleton(CameraService);

export const Device = makeSingleton(DeviceService);

// Convert some Angular and Ionic injectables to singletons.
export const NgZone = makeSingleton(NgZoneService);
export const Http = makeSingleton(HttpClient);
export const Platform = makeSingleton(PlatformService);
export const ActionSheetController = makeSingleton(ActionSheetControllerService);
export const AlertController = makeSingleton(AlertControllerService);
export const LoadingController = makeSingleton(LoadingControllerService);
export const ModalController = makeSingleton(ModalControllerService);
export const PopoverController = makeSingleton(PopoverControllerService);
export const ToastController = makeSingleton(ToastControllerService);
export const GestureController = makeSingleton(GestureControllerService);
export const ApplicationInit = makeSingleton(ApplicationInitStatus);
export const Application = makeSingleton(ApplicationRef);
export const NavController = makeSingleton(NavControllerService);
export const Router = makeSingleton(RouterService);

// Convert external libraries injectables.
export const Translate = makeSingleton(TranslateService);