zprp/Models/User.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;

using Newtonsoft.Json;

namespace Eat.Models
{
    enum Sex
    {
        Male, Female
    };

    enum ActivityLevel
    {
        VeryLow, Low, Medium, High, VeryHigh
    };

    enum Goal
    {
        Reduce, Stay, Gain
    }

    class User : Product
    {
        [JsonProperty]
        public Sex Sex
        {
            get;
            set;
        }
        [JsonProperty]
        public ActivityLevel ActivityLevel
        {
            get; set;
        }
        [JsonProperty]
        public Goal Goal
        {
            get;
            set;
        }
        [JsonProperty]
        public double Weight
        {
            get;
            set;
        }
        [JsonProperty]
        public int Height
        {
            get;
            set;
        }
        [JsonProperty]
        public DateTime Birthday
        {
            get => Birthday;
            set
            {
                Birthday = value;
                Age = (DateTime.Now.Subtract(Birthday).Days / 365);
            }
        }
        [JsonProperty]
        public int Age
        {
            get;
            private set;
        }

        [JsonProperty]
        public double FatRatio
        {
            get;
            private set;
        }
        [JsonProperty]
        public double CarbsRatio
        {
            get;
            private set;
        }
        [JsonProperty]
        public double ProteinRatio
        {
            get;
            private set;
        }

        static readonly Dictionary<ActivityLevel, double> ActivityFactor = new Dictionary<ActivityLevel, double>
        {
            {ActivityLevel.VeryLow, 1.2},
            {ActivityLevel.Low, 1.375},
            {ActivityLevel.Medium, 1.55},
            {ActivityLevel.High, 1.725},
            {ActivityLevel.VeryHigh, 1.9}
        };

        public User(Sex sex, ActivityLevel activityLevel, Goal goal, double weight, int height, DateTime birthday)
        {
            Sex = sex;
            ActivityLevel = activityLevel;
            Goal = Goal;
            Weight = weight;
            Height = height;
            Birthday = birthday;

            if (Goal == Goal.Reduce)
            {
                FatRatio = 0.3;
                CarbsRatio = 0.4;
                ProteinRatio = 0.3;
            }
            else if (Goal == Goal.Stay)
            {
                FatRatio = 0.275;
                CarbsRatio = 0.5;
                ProteinRatio = 0.225;
            }
            else
            {
                FatRatio = 0.2;
                CarbsRatio = 0.6;
                ProteinRatio = 0.2;
            }
        }

        public User(Sex sex, ActivityLevel activityLevel, Goal goal, double weight, int height, DateTime birthday, double fatRatio, double carbsRatio, double proteinRatio)
        {
            Sex = sex;
            ActivityLevel = ActivityLevel;
            Goal = goal;
            Weight = weight;
            Height = height;
            Birthday = birthday;
            FatRatio = fatRatio;
            CarbsRatio = carbsRatio;
            ProteinRatio = proteinRatio;
        }

        public override void CalculateElements()
        {
            // Kcal
            //
            //
            // Basic calculation
            //
            Kcal = Convert.ToInt32((10 * Weight) + (6.25 * Height) - (4.92 * Age));

            // Gender
            //
            if (Sex == Sex.Male)
            {
                Kcal += 5;
            }
            else
            {
                Kcal -= 161;
            }

            // ActivityFactor
            //
            Kcal = Convert.ToInt32(Kcal * ActivityFactor[ActivityLevel]);

            // Goal
            //
            if (Goal == Goal.Reduce)
            {
                Kcal -= 250;
            }
            else if (Goal == Goal.Gain)
            {
                Kcal += 250;
            }

            // Elements
            //
            //
            Fat = Kcal / 9.0 * FatRatio;
            Carbs = Kcal / 4.0 * CarbsRatio;
            Protein = Kcal / 4.0 * ProteinRatio;
        }
    }
}