import {WebStorage, NullStorage, CookieAndLocalStorage} from '../storage';
import {AnalyticsBeaconClient} from './analyticsBeaconClient';
import {hasLocalStorage, hasCookieStorage} from '../detector';
import {AnalyticsRequestClient, IAnalyticsClientOptions, NoopAnalyticsClient} from './analyticsRequestClient';
import {AnalyticsFetchClient} from './analyticsFetchClient';
import {BufferedRequest} from './analytics';
import {EventType} from '../events';

export interface IRuntimeEnvironment {
    storage: WebStorage;
    client: AnalyticsRequestClient;
    getClientDependingOnEventType(eventType: EventType): AnalyticsRequestClient;
}

export class BrowserRuntime implements IRuntimeEnvironment {
    public storage: WebStorage;
    public client: AnalyticsFetchClient;
    private beaconClient: AnalyticsBeaconClient;

    constructor(clientOptions: IAnalyticsClientOptions, getUnprocessedRequests: () => Array<BufferedRequest>) {
        if (hasLocalStorage() && hasCookieStorage()) {
            this.storage = new CookieAndLocalStorage();
        } else if (hasLocalStorage()) {
            this.storage = localStorage;
        } else {
            console.warn('BrowserRuntime detected no valid storage available.', this);
            this.storage = new NullStorage();
        }
        this.client = new AnalyticsFetchClient(clientOptions);
        this.beaconClient = new AnalyticsBeaconClient(clientOptions);
        window.addEventListener('beforeunload', () => {
            const requests = getUnprocessedRequests();
            for (let {eventType, payload} of requests) {
                this.beaconClient.sendEvent(eventType, payload);
            }
        });
    }

    public getClientDependingOnEventType(eventType: EventType) {
        return eventType === 'click' && this.beaconClient.isAvailable() ? this.beaconClient : this.client;
    }
}

export class NodeJSRuntime implements IRuntimeEnvironment {
    public storage: WebStorage;
    public client: AnalyticsFetchClient;

    constructor(clientOptions: IAnalyticsClientOptions, storage?: WebStorage) {
        this.storage = storage || new NullStorage();
        this.client = new AnalyticsFetchClient(clientOptions);
    }

    getClientDependingOnEventType(eventType: EventType): AnalyticsRequestClient {
        return this.client;
    }
}

export class NoopRuntime implements IRuntimeEnvironment {
    public storage = new NullStorage();
    public client = new NoopAnalyticsClient();

    getClientDependingOnEventType(eventType: EventType): AnalyticsRequestClient {
        return this.client;
    }
}