'use strict';

import chai from 'chai';
const assert = chai.assert;
import ROC from '../../lib/indicator/rate-of-change.js';

describe('Rate Of Change', () => {

    let data = [2, 3, 5, 8, 4, 2, 6, 7];
    let expectedResults = [0, 0, 0, 0, 100, -33.3, 20, -12.5];

    let runTest = async (data, expectedResults, options) => {
        let roc = new ROC(options);
        roc.setValues(data);
        let results = await roc.calculate();

        assert.isArray(results);
        assert.isTrue(results.length == expectedResults.length);
        results.forEach((result, idx) => {
            assert.containsAllKeys(result, ['price', 'roc']);
            assert.isNumber(result.price);
            assert.isNumber(result.roc);
            assert.closeTo(result.roc, expectedResults[idx], 0.1);
        });
    };

    it('should calculate correctly and return results', () => {
        (async () => {
            runTest(data, expectedResults, { periods: 4, sliceOffset: false });
        })();
    });

    it('should calculate correctly in range and return results', () => {
        (async () => {
            let dataCopy = [...data];
            dataCopy.unshift(3);
            dataCopy.push(4);
            runTest(dataCopy, expectedResults, { periods: 4, startIndex: 1, endIndex: dataCopy.length - 2, sliceOffset: false });
        })();
    });

    it('should calculate correctly with sliceOffset and return results', () => {
        let e = expectedResults.slice(4);
        (async () => {
            runTest(data, e, { periods: 4, sliceOffset: true });
        })();
    });

});