'use strict';

import chai from 'chai';
const assert = chai.assert;
import SMMA from '../../lib/indicator/smoothed-moving-average.js';

describe('Smoothed Moving Average', () => {

    let data = [20, 21, 22, 21, 20, 19, 18, 22, 21, 22, 23, 24];

    let runTest = async (data, expectedResults, options = {}) => {
        let smma = new SMMA(options);
        smma.setValues(data);
        let results = await smma.calculate();

        assert.isArray(results);
        assert.isTrue(results.length == expectedResults.length);
        results.forEach((item, idx) => {
            assert.containsAllKeys(item, ['price', 'smma']);
            assert.closeTo(item.smma, expectedResults[idx], 0.02);
            assert.isTrue(item.price > 0);
        });
    };

    it('should calculate correctly and return results', () => {
        (async () => {
            let expectedResults = [21, 20.75, 20.31, 19.73, 20.3, 20.48, 20.86, 21.4, 22.05];
            await runTest(data, expectedResults, { periods: 4, sliceOffset: true });

            let expectedResults2 = [0, 0, 0].concat(expectedResults);
            await runTest(data, expectedResults2, { periods: 4, sliceOffset: false });

            let dataCopy = [...data];
            dataCopy.unshift(19);
            dataCopy.push(22);
            await runTest(dataCopy, expectedResults2, { periods: 4, sliceOffset: false, startIndex: 1, endIndex: dataCopy.length - 2 });
        })();

    });

});