import {Injectable} from '@angular/core';
import {Http, Response} from '@angular/http';
import {Observable} from 'rxjs/Observable';
import {CustomOptions} from './servicesUtils/customOptions.class';

@Injectable()
export class LayoutService {
    constructor(private http: Http) {
    }

    static removeNulls(obj) {
        const isArray = obj instanceof Array;
        for (let k in obj) {
            if (obj[k] === null || obj[k] === '') {
                isArray ? obj.splice(k, 1) : delete obj[k];
            } else if (typeof obj[k] === 'object') {
                LayoutService.removeNulls(obj[k]);
            }
        }
    }

    saveLayout(pid: string, url: string, layout: any) {
        LayoutService.removeNulls(layout);
        return this.http.post(url + 'community/' + pid + '/updateLayout', JSON.stringify(layout), CustomOptions.getAuthOptionsWithBody())
            .map(res => res.json())
            .catch(this.handleError);
    }

    getLayout(pid: string, url: string) {
        return this.http.get(url + 'community/' + pid + '/layout')
            .map(res => res.json())
            .catch(this.handleError);
    }

    loadDefaultLayout(pid: string, url: string) {
        return this.http.post(url + 'community/' + pid + '/resetLayout', null, CustomOptions.getAuthOptionsWithBody())
            .map(res => res.json())
            .catch(this.handleError);
    }

    private handleError(error: Response) {
        // in a real world app, we may send the error to some remote logging infrastructure
        // instead of just logging it to the console
        console.error(error);
        return Observable.throw(error.json().error || 'Server error');
    }
}