module BrowserHuman

# File lib/browser_human.rb, line 14
def bezier_path(x0, y0, x1, y1, steps: DEFAULT_STEPS, rand_fn: nil)
  random = rand_fn || method(:rand)
  steps = [steps.to_i, 2].max
  cp1x = x0 + (x1 - x0) * random_fraction(random, 0.2, 0.45)
  cp1y = y0 + (y1 - y0) * random_fraction(random, -0.35, 0.35)
  cp2x = x0 + (x1 - x0) * random_fraction(random, 0.55, 0.85)
  cp2y = y0 + (y1 - y0) * random_fraction(random, 0.65, 1.35)

  (1..steps).map do |step|
    t = step / steps.to_f
    u = 1.0 - t
    x = (u**3 * x0) + (3 * u**2 * t * cp1x) + (3 * u * t**2 * cp2x) + (t**3 * x1)
    y = (u**3 * y0) + (3 * u**2 * t * cp1y) + (3 * u * t**2 * cp2y) + (t**3 * y1)
    if step < steps
      jitter = random_fraction(random, -1.5, 1.5)
      x += jitter
      y += (jitter * 0.6)
    end
    [x, y]
  end
end

# File lib/browser_human.rb, line 55
def idle_wander(mouse, width:, height:, sleep_fn: nil, rand_fn: nil)
  random = rand_fn || method(:rand)
  sleeper = sleep_fn || method(:sleep)
  moves = random_between(random, 1, 3)
  moves.times do
    target_x = random_between(random, 40, width - 41)
    target_y = random_between(random, 40, height - 41)
    natural_move(mouse, x: target_x, y: target_y, sleep_fn: sleeper, rand_fn: random)
    sleeper.call(random_between(random, 50, 150) / 1000.0)
  end
  mouse
end

# File lib/browser_human.rb, line 85
def mouse_position(mouse)
  if mouse.respond_to?(:current_position)
    mouse.current_position
  else
    [mouse.instance_variable_get(:@x) || 0, mouse.instance_variable_get(:@y) || 0]
  end
end

# File lib/browser_human.rb, line 47
def natural_click(mouse, x:, y:, sleep_fn: nil, rand_fn: nil)
  random = rand_fn || method(:rand)
  sleeper = sleep_fn || method(:sleep)
  natural_move(mouse, x: x, y: y, sleep_fn: sleeper, rand_fn: random)
  sleeper.call(random_fraction(random, 0.04, 0.12))
  mouse.click(x: x, y: y)
end

# File lib/browser_human.rb, line 36
def natural_move(mouse, x:, y:, sleep_fn: nil, rand_fn: nil)
  random = rand_fn || method(:rand)
  sleeper = sleep_fn || method(:sleep)
  from_x, from_y = mouse_position(mouse)
  bezier_path(from_x, from_y, x, y, rand_fn: random).each do |px, py|
    mouse.move(x: px, y: py, steps: 1)
    sleeper.call(random_fraction(random, MIN_SLEEP_SEC, MAX_SLEEP_SEC))
  end
  mouse
end

# File lib/browser_human.rb, line 68
def random_between(random, min, max)
  if random.equal?(method(:rand))
    random.call(min..max)
  else
    span = max - min + 1
    min + (random.call(span).to_i % span)
  end
end

# File lib/browser_human.rb, line 77
def random_fraction(random, min, max)
  if random.equal?(method(:rand))
    random.call(min..max)
  else
    min + ((random.call(1000).to_f % 1000) / 1000.0) * (max - min)
  end
end