var assert = require('assert'),
    mfcc = require('../');

mfcc = new mfcc.construct(64, 32, 300, 3500, 8000);

var flat = [1,1,1,1,1,1,1,1,
            1,1,1,1,1,1,1,1,
            1,1,1,1,1,1,1,1,
            1,1,1,1,1,1,1,1,
            1,1,1,1,1,1,1,1,
            1,1,1,1,1,1,1,1,
            1,1,1,1,1,1,1,1,
            1,1,1,1,1,1,1,1];

describe('MFCC', function () {
  describe('Output should be valid', function () {
    it('Length Test', function () {
      var coef = mfcc(flat);

      assert.equal(coef.length, 12);
    });
    
    it('Flat Test', function () {
      var coef = mfcc(flat);

      // First coefficient should be large and all the others should be low since
      // the input magnitudes are all flat.
      for (var i = 1; i < coef.length; i++)
        assert(Math.abs(coef[0]) > Math.abs(coef[i]));
    });
  }); 
});

function equalWithThresh(val1, val2, threshold) {
  return (val1 > val2 - threshold) && 
       (val1 < val2 + threshold);
};