import expect from '../../../expect.js';
import {
  lineStringLength,
  linearRingLength,
} from '../../../../../src/ol/geom/flat/length.js';

describe('ol/geom/flat/length.js', function () {
  describe('lineStringLength', function () {
    describe('stride = 2', function () {
      const flatCoords = [0, 0, 1, 0, 1, 1, 0, 1];
      const stride = 2;

      it('calculates the total length of a lineString', function () {
        const offset = 0;
        const end = 8;
        const expected = 3;
        const got = lineStringLength(flatCoords, offset, end, stride);
        expect(got).to.be(expected);
      });

      it('calculates a partwise length of a lineString (offset)', function () {
        const offset = 2;
        const end = 8;
        const expected = 2;
        const got = lineStringLength(flatCoords, offset, end, stride);
        expect(got).to.be(expected);
      });

      it('calculates a partwise length of a lineString (end)', function () {
        const offset = 0;
        const end = 4;
        const expected = 1;
        const got = lineStringLength(flatCoords, offset, end, stride);
        expect(got).to.be(expected);
      });
    });

    describe('stride = 3', function () {
      const flatCoords = [0, 0, 42, 1, 0, 42, 1, 1, 42, 0, 1, 42];
      const stride = 3;

      it('calculates the total length of a lineString', function () {
        const offset = 0;
        const end = 12;
        const expected = 3;
        const got = lineStringLength(flatCoords, offset, end, stride);
        expect(got).to.be(expected);
      });

      it('calculates a partwise length of a lineString (offset)', function () {
        const offset = 3;
        const end = 12;
        const expected = 2;
        const got = lineStringLength(flatCoords, offset, end, stride);
        expect(got).to.be(expected);
      });

      it('calculates a partwise length of a lineString (end)', function () {
        const offset = 0;
        const end = 6;
        const expected = 1;
        const got = lineStringLength(flatCoords, offset, end, stride);
        expect(got).to.be(expected);
      });
    });
  });

  describe('linearRingLength', function () {
    it('calculates the total length of a simple linearRing', function () {
      const flatCoords = [0, 0, 1, 0, 1, 1, 0, 1];
      const stride = 2;
      const offset = 0;
      const end = 8;
      const expected = 4;
      const got = linearRingLength(flatCoords, offset, end, stride);
      expect(got).to.be(expected);
    });

    it('calculates the total length of a figure-8 linearRing', function () {
      const flatCoords = [0, 0, 1, 0, 1, 1, 0, 1, 0, -1, -1, -1, -1, 0];
      const stride = 2;
      const offset = 0;
      const end = 14;
      const expected = 8;
      const got = linearRingLength(flatCoords, offset, end, stride);
      expect(got).to.be(expected);
    });
  });
});