import { describe, expect, it } from '@jest/globals';
import { eCompress, eToDd } from 'big-float-ts';
import { eEqual } from '../../../src/basic/expansion/e-equal.js';
import { ddDeflate } from '../../../src/roots/deflate/dd-deflate.js';
import { toCasStr } from '../../../src/basic/to-cas-str.js';


describe('ddDeflate', function() {
    it('should correctly deflate (in double-double precision) some polynomials', 
    function() {
        {
            const p = [[0,1], [0,-5], [0,8], [0,-4]];
            const r = 2;
            expect(eEqual(ddDeflate(p, r), [[0,1], [0,-3], [0,2]])).toEqual(true);
        }
        {
            const p = [[0,1], [0,-3], [0,2]];
            const r = 2;
            expect(eEqual(ddDeflate(p, r), [[0,1],[0,-1]])).toEqual(true);
        }
        {
            const p = [[0,1], [0,-1]];
            const r = 1;
            expect(eEqual(ddDeflate(p, r), [[0,1]])).toEqual(true);
        }
        {
            const p = [
                [289929216],
                [-1434354240],
                [2657550888],
                [-1.8862192519009113e-7, -2178410857.975074],
                [-3.2654497772455215e-8, 681767178.2820708],
                [2.953129296656698e-9, -34728237.352687724 ]
            ];

            const r = 0.0625;
            
            const res = ddDeflate(p.map(c => eToDd(c)), r);
            expect(eEqual(res, [
                [0, 289929216],
                [0, -1416233664],
                [0, 2569036284],
                [4.979665391147137e-8, -2017846090.225074],
                [1.5161276678554714e-8, 555651797.6430036]
            ])).toBe(true);
        }
    });
});