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

namespace EmployeeManagement
{
    public struct PerformanceLevel
    {
        // Private fields.
        private int numRankings;
        private int totalScore;

        // Helper functions.
        public PerformanceLevel(int numRankings = 1, int score = 0)
        {
            this.numRankings = numRankings;
            this.totalScore = score;
        }

        public override string ToString()
        {
            return string.Format("Rankings: {0}, Total: {1}, Effective Average: {2}", numRankings, totalScore, EffectiveAverageScore);
        }

        public int EffectiveAverageScore
        {
            get { return totalScore / numRankings; }
        }

        // Functions that are required if you override operator==.
        public override bool Equals(object obj)
        {
            // Try to convert other object to a PerformanceLevel type.
            PerformanceLevel? other = obj as PerformanceLevel?;
            if (other == null)
            {
                return false;
            }
            else
            {
                // Use operator== to determine if this object equals the other object.
                return this == other.Value;
            }
        }

        public override int GetHashCode()
        {
            // Return this object's average score as an effective hashcode.
            return EffectiveAverageScore;
        }

        // Operators.
        public static PerformanceLevel operator +(PerformanceLevel p1, int score)
        {
            return new PerformanceLevel(p1.numRankings + 1, p1.totalScore + score);
        }

        public static bool operator ==(PerformanceLevel p1, PerformanceLevel p2)
        {
            return p1.EffectiveAverageScore == p2.EffectiveAverageScore;
        }

        public static bool operator !=(PerformanceLevel p1, PerformanceLevel p2)
        {
            return p1.EffectiveAverageScore != p2.EffectiveAverageScore;
        }

        public static bool operator ==(PerformanceLevel p1, int otherScore)
        {
            return p1.EffectiveAverageScore == otherScore;
        }

        public static bool operator !=(PerformanceLevel p1, int otherScore)
        {
            return p1.EffectiveAverageScore != otherScore;
        }

        public static bool operator >(PerformanceLevel p1, PerformanceLevel p2)
        {
            return p1.EffectiveAverageScore > p2.EffectiveAverageScore;
        }

        public static bool operator <(PerformanceLevel p1, PerformanceLevel p2)
        {
            return p1.EffectiveAverageScore < p2.EffectiveAverageScore;
        }

        public static bool operator >(PerformanceLevel p1, int otherScore)
        {
            return p1.EffectiveAverageScore > otherScore;
        }

        public static bool operator <(PerformanceLevel p1, int otherScore)
        {
            return p1.EffectiveAverageScore < otherScore;
        }
    }
}