package pr02;

import java.text.*;

public class Student {
	private static final int DEFAULT_NUM_EXAMS = 1;
	private static final int DEFAULT_NUM_LABS = 2;
	private static final int DEFAULT_NUM_QUIZZES = 3;
	private static final double LAB_WEIGHT = 0.3;
	private static final double QUIZ_WEIGHT = 0.2;
	private static final double EXAM_WEIGHT = 0.5;
	private Name name;
	private String id;
	private double [] exams;       // all scores are between 0 and 100
	private double [] labs;
	private double [] quizzes;
	private boolean gradeChanged = true;
	private double courseAverage;
	private DecimalFormat fmt;
	
	
	public Student(Name name, String id, int numLabs, int numQuizzes, int numExams) {
		this.name = name;
		this.id =id;
		if (numLabs < 2)
			numLabs = 2;
		if (numQuizzes < 3)
			numQuizzes = 3;
		if (numExams < 1)
			numExams = 1;
		exams = new double[numExams];
		labs = new double[numLabs];
		quizzes = new double[numQuizzes];
		for (int i=0;i<exams.length;i++)
			exams[i] = 0;
		for (int i=0;i<labs.length;i++)
			labs[i] = 0;
		for (int i=0;i<quizzes.length;i++)
			quizzes[i] = 0;
		fmt = new DecimalFormat("0.00");
	}
	
	public Student(Name n, String id) {
		this(n, id, DEFAULT_NUM_LABS, DEFAULT_NUM_QUIZZES, DEFAULT_NUM_EXAMS);
	}
	
	public Name getName() {
		return name;
	}
	
	public String getId() {
		return id;
	}
	
	public int getNumLabs() {
		return labs.length;
	}
	
	public int getNumQuizzes() {
		return quizzes.length;
	}
	
	public int getNumExams() {
		return exams.length;
	}
	
	public void setExamGrade(int i, double score) {
		setGrade(i, score, exams);
		gradeChanged = true;
	}
	
	public double getExamGrade(int i) {
		return getGrade(i, exams);
	}
	
	public void setLabGrade(int i, double score) {
		setGrade(i, score, labs);
		gradeChanged = true;
	}
	
	public double getLabGrade(int i) {
		return getGrade(i, labs);
	}
	
	public void setQuizGrade(int i, double score) {
		setGrade(i, score, quizzes);
		gradeChanged = true;
	}
	
	public double getQuizGrade(int i) {
		return getGrade(i, quizzes);
	}
		
	public double getExamAverage() {
		return getAverage(exams);
	}
	
	public double getLabAverage() {
		return getAverageDropLowest(labs);
	}
	
	public double getQuizAverage() {
		return getAverageDropHighestLowest(quizzes);
	}
	
	private static boolean setGrade(int i, double g, double[] list) {
		if(i>=1 && i<=list.length) {
			list[i-1] = g;
			return true;
		}
		return false;
	}
	
	private static double getGrade(int i, double[] list) {
		if(i>=1 && i<=list.length)
			return list[i-1];
		return 0;
	}
	
	private static double getSum(double[] list) {
		double sum = 0;
		for (int i=0; i< list.length; i++)
			sum += list[i];
		return sum;
	}
	
	
	// assumes list has at least 1 element
	private static double getAverage(double[] list) {
		return getSum(list)/list.length;
	}
	
	// assumes list has more than 1 element
	private static double getAverageDropLowest(double[] list) {
		double sum = 0;
		sum = getSum(list);
		sum -= getMinValue(list);
		return sum/(list.length-1);
	}
	
	// assumes list has more than 2 elements
	private static double getAverageDropHighestLowest(double[] list) {
		double sum = 0;
		for (int i=0;i<list.length;i++)
			sum += list[i];
		sum -= getMinValue(list);
		sum -= getMaxValue(list);
		return sum/(list.length-2);
	}
	
	// assumes list has at least one element
	private static double getMinValue(double[] list) {
		double min = list[0];
		for (int i=1;i<list.length;i++)
			if (min > list[i])
				min = list[i];
		return min;
	}
	
	// assumes list has at least one element
	private static double getMaxValue(double[] list) {
		double max = list[0];
		for (int i=1;i<list.length;i++)
			if (max < list[i])
				max = list[i];
		return max;
	}
	
	// uses momoization for efficiency
	public double getCourseAverage() {
		if (gradeChanged) {
			courseAverage = getExamAverage()*EXAM_WEIGHT +
				getLabAverage()*LAB_WEIGHT +
				getQuizAverage()*QUIZ_WEIGHT;
			gradeChanged = false;
		}
		return courseAverage;
	}
	
	public Student duplicate() {
		Student newStudent = new Student(name,id,labs.length,quizzes.length,exams.length);
		for (int i=0;i<labs.length;i++)
			newStudent.labs[i] = labs[i];
		for (int i=0;i<quizzes.length;i++)
			newStudent.quizzes[i] = quizzes[i];
		for (int i=0;i<exams.length;i++)
			newStudent.exams[i] = exams[i];
		return newStudent;
	}
	
	public String toString() {
		StringBuffer s = new StringBuffer("Name: " + name + ", ID: " + id + "\n"
				+ "Exam scores: ");
		for (int i=0; i<exams.length-1; i++)
			s.append(fmt.format(exams[i]) + ", ");
		s.append(fmt.format(exams[exams.length-1]) + "\n" + "Lab scores: ");
		for (int i=0; i<labs.length-1; i++)
			s.append(fmt.format(labs[i]) + ", ");
		s.append(labs[labs.length-1] + "\n" + "Quiz scores: ");
		for (int i=0; i<quizzes.length-1; i++)
			s.append(fmt.format(quizzes[i]) + ", ");
		s.append(fmt.format(quizzes[quizzes.length-1]) + "\n");
		s.append("Course average: " + fmt.format(getCourseAverage()) + "\n");
		return s.toString();
	}
	
}