import { Injectable } from '@angular/core';
import { Http } from '@angular/http';

@Injectable()
export class VisualizationService {

    private http: Http;

    constructor(http: Http) {
        this.http = http;
    }


    doSomething(){
        console.log('Done!');
    }

    contaisObj(nameKey, prop, myArray){
        for (let i=0; i < myArray.length; i++) {
            if (myArray[i][prop] === nameKey[prop]) {
                return true;
            }
        }
        return false;
    }

    indexOfObj(nameKey, prop, myArray){
        for (let i=0; i < myArray.length; i++) {
            if (myArray[i][prop] === nameKey[prop]) {
                return i;
            }
        }
    }

    countAnswerOccurrence(datum){
        let freq_map = []
        for(let k = 0; k < datum.length; k++){
            if(this.contaisObj(datum[k], "answer", freq_map)){
                let index = this.indexOfObj(datum[k], "answer", freq_map);
                freq_map[index]["qty"] += 1;
            }
            else{
                freq_map.push({
                    "answer": datum[k].answer,
                    "qty": 1
                });
            }
        }
        return freq_map

    }

    parseData(data){
        for (let i=0; i < data.length; i++) {
            for(let j=0; j < data[i].length; j++){
                data[i][j] = JSON.parse(data[i][j]);
            }
        }
        return data;
    }

    genFrequencyMap(data){
        let freq_map = [];
        for(let i = 0; i < data.length ; i++){
            let question = data[i];
            let questionData = this.parseData(question.data);
            freq_map.push({
                "question": question.question,
                "data": this.countAnswerOccurrence(questionData)
            });
        }
        return freq_map;
    }

    
}