import { assert } from 'chai';
import {
    bound,
    interpolate,
    interpolate2
} from '../../../lib/math/functions';

describe('math.functions', () => {
    describe('bound', () => {
        test.each([
            [2, 1, 8, 2],
            [2, 2, 8, 2],
            [2, 4, 8, 4],
            [2, 8, 8, 8],
            [2, 10, 8, 8],
            [2, 1, 2, 2],
            [2, 2, 2, 2],
            [2, 4, 2, 2],
            [4, 1, 2, 4],
            [4, 3, 2, 4],
            [4, 6, 2, 4],
            [0, 0, 1, 0],
        ])('bound#%#', (min: number, val: number, max: number, result: number) => {
            assert.strictEqual(bound(min, val, max), result);
        });
    });

    describe('interpolate', () => {
        test.each([
            [0, 10, 0, 0],
            [0, 10, 1, 10],
            [0, 10, 0.5, 5],
            [0, 10, 2, 20],
            [0, 10, -0.5, -5],
        ])('interpolate#%#', (from: number, to: number, progress: number, result: number) => {
            assert.strictEqual(interpolate(from, to, progress), result);
        });
    });

    describe('interpolate2', () => {
        test.each([
            [0, 10, 0, 0],
            [0, 10, 1, 10],
            [0, 10, 0.5, 5],
            [0, 10, 2, 20],
            [0, 10, -0.5, -5],
        ])('interpolate2#%#', (from: number, to: number, progress: number, result: number) => {
            assert.strictEqual(interpolate2(from, to, progress), result);
        });
    });
});