mfp.rb

gistfile1.rb

require 'mechanize'
require 'moving_average'
 
mechanize = Mechanize.new
login_page = mechanize.get 'https://www.myfitnesspal.com/account/login'
form = login_page.forms.first
# noinspection RubyResolve
form.field_with(id: 'username').value = "username"
form.field_with(id: 'password').value = "pass"
form.submit
 
days_to_query = 27
 
weight_report = mechanize.get("http://www.myfitnesspal.com/reports/results/progress/1/#{days_to_query}.json")
calories_report = mechanize.get("http://www.myfitnesspal.com/reports/results/nutrition/Calories/#{days_to_query}.json")
 
weights = JSON.parse(weight_report.body)["data"]
calories = JSON.parse(calories_report.body)["data"]
 
avg_calories = calories.map { |hash| hash['total'] }.reject { |x| x == 0 }.instance_eval { reduce(:+) / size.to_f }
puts "Calories: #{ avg_calories }"
 
weight_values = weights.map { |hash| hash['total'] }
smoothed_weights = []
weight_values.count.times do |idx|
  smoothed_weights.push(
      if idx > 1
        weight_values[0, idx + 1].smma.round(1)
      else
        weight_values[idx]
      end
  )
end
 
weight_change = weight_values.first - weight_values.last
weight_in_calories = weight_change * 7700
 
weight = weight_values.last
observed_tdee = avg_calories + weight_in_calories / weights.count
protein = weight * 2
fats = weight * 0.8
carbs = (observed_tdee - (protein*4 + fats * 9))/4
 
puts "Observed TDEE is #{observed_tdee}"
puts "protein = #{protein} g"
puts "fat = #{fats} g"
puts "carbs = #{carbs} g"

The instance_eval is a bit smelly. What is the return value of the calories.map step? (guessing it's a list of floats)

Stylistically, I'd probably do averages externally from the array class and avoid instance_eval altogether. It's not always wrong, but usually only used for DSLs.

def avg(xs)
  return xs.inject(:+) / xs.length
end

avg_calories = avg calories.map { |hash| hash['total'] }.reject { |x| x == 0 }

(didn't say this above, but thanks for this! will be using this to extract my own data)