import assert from 'assert'
import math from '../../../src/main'

describe('dot', function () {
  it('should calculate dot product for two arrays', function () {
    assert.strictEqual(math.dot([2, 4, 1], [2, 2, 3]), 15)
    assert.strictEqual(math.dot([7, 3], [2, 4]), 26)
  })

  it('should calculate dot product for two matrices', function () {
    assert.strictEqual(math.dot(math.matrix([2, 4, 1]), math.matrix([2, 2, 3])), 15)
    assert.strictEqual(math.dot(math.matrix([7, 3]), math.matrix([2, 4])), 26)
  })

  it('should calculate dot product for mixed arrays and matrices', function () {
    assert.strictEqual(math.dot([2, 4, 1], math.matrix([2, 2, 3])), 15)
    assert.strictEqual(math.dot(math.matrix([7, 3]), [2, 4]), 26)
  })

  it('should throw an error for unsupported types of arguments', function () {
    assert.throws(function () { math.dot([2, 4, 1], 2) }, TypeError)
  })

  it('should throw an error for multi dimensional matrix input', function () {
    assert.throws(function () { math.dot([[1, 2], [3, 4]], [[1, 2], [3, 4]]) }, /Vector expected/)
  })

  it('should throw an error in case of vectors with unequal length', function () {
    assert.throws(function () { math.dot([2, 3], [1, 2, 3]) }, /Vectors must have equal length \(2 != 3\)/)
  })

  it('should throw an error in case of empty vectors', function () {
    assert.throws(function () { math.dot([], []) }, /Cannot calculate the dot product of empty vectors/)
  })

  it('should LaTeX dot', function () {
    const expression = math.parse('dot([1,2],[3,4])')
    assert.strictEqual(expression.toTex(), '\\left(\\begin{bmatrix}1\\\\2\\\\\\end{bmatrix}\\cdot\\begin{bmatrix}3\\\\4\\\\\\end{bmatrix}\\right)')
  })
})