class MathWizard

# File lib/math_wizard.rb, line 38
def self.abs_arr(arr)
  (0...arr.length).each do |i|
    arr[i] = arr[i].abs
  end
  arr
end

# File lib/math_wizard.rb, line 8
def self.add(*arr)
  if arr[0].instance_of?(Array)
    if arr[0][0].instance_of?(Array)
      new_arr = []
      (0...arr[0].length).each do |i|
        new_arr.push(arr[0][i].sum)
      end
      new_arr
    elsif arr[0].instance_of?(Array)
      new_arr = []
      ind = 0
      (0...arr.length).each do |i|
        ind = arr[i].length if arr[i].length > ind
      end
      (0...ind).each do |i|
        sum = 0
        (0...arr.length).each do |j|
          sum += arr[j][i] if i < arr[j].length
        end
        new_arr.push(sum)
      end
      new_arr
    else
      arr[0].sum
    end
  else
    arr.sum
  end
end

# File lib/math_wizard.rb, line 103
def self.celsius(fahrenheit:)
  (fahrenheit - 32) * (5 / 9)
end

# File lib/math_wizard.rb, line 57
def self.divide(*arr)
  actual_arr = []
  if arr[0].instance_of?(Array)
    (0...arr[0].length).each do |i|
      actual_arr.push(arr[0][i] / arr[1][i])
    end
    actual_arr
  else
    arr[0] / arr[1]
  end
end

# File lib/math_wizard.rb, line 99
def self.fahrenheit(celsius:)
  ((9 / 5) * celsius) + 32
end

# File lib/math_wizard.rb, line 4
def self.hi
  puts 'Hello world!'
end

# File lib/math_wizard.rb, line 69
def self.multiply(*arr)
  if arr[0].instance_of?(Array)
    if arr[0][0].instance_of?(Array)
      new_arr = []
      (0...arr[0].length).each do |i|
        new_arr.push(arr[0][i].inject(:*))
      end
      new_arr
    elsif arr[0].instance_of?(Array)
      new_arr = []
      ind = 0
      (0...arr.length).each do |i|
        ind = arr[i].length if arr[i].length > ind
      end
      (0...ind).each do |i|
        sum_value = 1
        (0...arr.length).each do |j|
          sum_value *= arr[j][i] if i < arr[j].length
        end
        new_arr.push(sum_value)
      end
      new_arr
    else
      arr[0].inject(:*)
    end
  else
    arr.inject(:*)
  end
end

# File lib/math_wizard.rb, line 45
def self.sub(*arr)
  actual_arr = []
  if arr[0].instance_of?(Array)
    (0...arr[0].length).each do |i|
      actual_arr.push(arr[0][i] - arr[1][i])
    end
    MathWizard.abs_arr(actual_arr)
  else
    (arr[0] - arr[1]).abs
  end
end