import {Injectable} from 'angular2/core';
import {Http, Headers} from 'angular2/http';

import 'rxjs/Rx'; // import all RxJS operators

import {QueryMode} from './query-mode';

@Injectable()
export class QueryService {
        
    public ismiObjectTypes;
    
    public QUERY_MODES: QueryMode[] = [
        {id: 'type_is', label:'Object type is'},
        {id: 'att_contains', label: 'Attribute contains'}];
        
    constructor(private _http: Http) {}
    
    getQueryModes(): QueryMode[] {
        return this.QUERY_MODES;
    }
    
    getQueryOptions(queryMode: string) {
        var options = ['a1', 'b1', 'c1'];
        if (queryMode == 'Attribute contains') {
            options = ['d', 'e', 'f'];
        }
        return Promise.resolve(options);
    }
    
    getIsmiObjectTypes() {
        var headers = new Headers();
        headers.append('Authorization', 'Basic ' + btoa('neo4j' + ':' + 'neo5j'));
        headers.append('Content-Type', 'application/json');
        headers.append('Accept', 'application/json');
        var data = {
            'query': `MATCH (n)
WITH DISTINCT labels(n) AS labels
UNWIND labels AS label
RETURN DISTINCT label
ORDER BY label`,
            'params': {}
        };

        this._http.post('http://localhost:7474/db/data/cypher/', JSON.stringify(data), {'headers': headers})
            .map(res => res.json())
            .subscribe(
            data => {
                console.debug("neo4j data=", data);
                this.ismiObjectTypes = data.data.map(elem => elem[0]).filter(elem => elem[0] != "_");
                },
            err => console.error("neo4j error=", err),
            () => console.debug('neo4j query Complete')
            );
    }
}