var assert = require('assert'),
    math = require('../../../index.js'),
    range = math.range,
    matrix = math.matrix;

describe('range', function() {

  it('should parse a valid string correctly', function() {
    assert.deepEqual(range('1:6'), matrix([1,2,3,4,5]));
    assert.deepEqual(range('0:2:10'), matrix([0,2,4,6,8]));
    assert.deepEqual(range('5:-1:0'), matrix([5,4,3,2,1]));
    assert.deepEqual(range('2:-2:-3'), matrix([2,0,-2]));
  });

  it('should create a range start:1:end if called with 2 numbers', function() {
    assert.deepEqual(range(3,6), matrix([3,4,5]));
    assert.deepEqual(range(1,6), matrix([1,2,3,4,5]));
    assert.deepEqual(range(1,6.1), matrix([1,2,3,4,5,6]));
    assert.deepEqual(range(1,5.9), matrix([1,2,3,4,5]));
    assert.deepEqual(range(6,1), matrix([]));
  });

  it('should create a range start:step:end if called with 3 numbers', function() {
    assert.deepEqual(range(0,10,2), matrix([0,2,4,6,8]));
    assert.deepEqual(range(5,0,-1), matrix([5,4,3,2,1]));
    assert.deepEqual(range(2,-4,-2), matrix([2,0,-2]));
  });

  it('should output an array when math.options.matrix.default==="array"', function() {
    var old = math.options.matrix.default;
    math.options.matrix.default = 'array';

    assert.deepEqual(range(0,10,2), [0,2,4,6,8]);
    assert.deepEqual(range(5,0,-1), [5,4,3,2,1]);

    math.options.matrix.default = old;
  });

  it('should throw an error if called with an invalid string', function() {
    assert.throws(function () {range('invalid range')}, SyntaxError);
  });

  it('should throw an error if called with a single number', function() {
    assert.throws(function () {range(2)}, TypeError);
  });

  it('should throw an error if called with a unit', function() {
    assert.throws(function () {range(math.unit('5cm'))}, TypeError);
  });

  it('should throw an error if called with a complex number', function() {
    assert.throws(function () {range(math.complex(2,3))}, TypeError);
  });

  it('should throw an error if called with one invalid argument', function() {  
    assert.throws(function () {range(2, 'string')}, TypeError);
    assert.throws(function () {range(math.unit('5cm'), 2)}, TypeError);
    assert.throws(function () {range(2, math.complex(2,3))}, TypeError);
    assert.throws(function () {range(2, 'string', 3)}, TypeError);
    assert.throws(function () {range(2, 1, math.unit('5cm'))}, TypeError);
    assert.throws(function () {range(math.complex(2,3), 1, 3)}, TypeError);
  });

  it('should throw an error if called with an invalid number of arguments', function() {
    assert.throws(function () {range()}, SyntaxError);
    assert.throws(function () {range(1,2,3,4)}, SyntaxError);
  });
});