package pr02;

import java.util.*;
import java.text.*;

public class Course {
	private String title;
	private String courseName;
	private Name instructor;
	private String semester;
	private int numQuizzes;
	private int numLabs;
	private int numExams;
	private ArrayList<Student> students;
	private DecimalFormat fmt;
	
	public Course(String title, String name, Name inst, String sem, int nLabs, int nQuizzes, int nExams) {
		this.title = title;
		courseName = name;
		instructor = inst;
		semester = sem;
		numLabs = nLabs;
		numQuizzes = nQuizzes;
		numExams = nExams;
		students = new ArrayList<Student>();
		fmt = new DecimalFormat("0.00");
	}
	
	public String getTitle() {
		return title;
	}

	public String getCourseName() {
		return courseName;
	}

	public Name getInstructor() {
		return instructor;
	}

	public String getSemester() {
		return semester;
	}
	
	public int getNumLabs() {
		return numLabs;
	}
	
	public int getNumQuizzes() {
		return numQuizzes;
	}
	
	public int getNumExams() {
		return numExams;
	}
	
	public int getNumberOfStudents() {
		return students.size();
	}
	
	public void addStudent(String fName, String mInitial, String lName, String id) {
		Student s;
		if (findStudentPosition(id) != -1)
			return;
		s = new Student(new Name(fName,mInitial,lName), id, numLabs, numQuizzes, numExams);
		students.add(s);
	}
	
	public void removeStudent(String id) {
		int pos;
		pos = findStudentPosition(id);
		if (pos == -1)
			return;
		students.remove(pos);
	}
	
	public void setLabGrade(String id, int which, double score) {
		int pos;
		pos = findStudentPosition(id);
		if (pos == -1)
			return;
		students.get(pos).setLabGrade(which ,score);
	}
	
	public void setQuizGrade(String id, int which, double score) {
		int pos;
		pos = findStudentPosition(id);
		if (pos == -1)
			return;
		students.get(pos).setQuizGrade(which,score);
	}
	
	public void setExamGrade(String id, int which, double score) {
		int pos;
		pos = findStudentPosition(id);
		if (pos == -1)
			return;
		students.get(pos).setExamGrade(which,score);
	}
	
	// search a student by name, id or position
	private int findStudentPosition(String id) {
		for (int i=0; i<students.size(); i++)
			if (students.get(i).getId().compareTo(id)==0)
				return i;
		return -1;
	}
	
	public Student getStudent(Name n) {
		for (int i=0; i<students.size(); i++) 
			if (students.get(i).getName().equals(n))
				return students.get(i).duplicate();
		return null;
	}
	
	public Student getStudent(String id) {
		for (int i=0; i<students.size(); i++) 
			if (students.get(i).getId().equals(id))
				return students.get(i).duplicate();
		return null;
	}

	public double getMaxAverage() {
		if (students.size() == 0)
			return 0;
		double max = students.get(0).getCourseAverage();
		for (int i=1;i<students.size();i++)
			if (max < students.get(i).getCourseAverage())
				max = students.get(i).getCourseAverage();
		return max;
	}
	
	public double getMinAverage() {
		if (students.size() == 0)
			return 0;
		double min = students.get(0).getCourseAverage();
		for (int i=1;i<students.size();i++)
			if (min > students.get(i).getCourseAverage())
				min = students.get(i).getCourseAverage();
		return min;
	}
	
	public double getAverage() {	
		if (students.size() == 0)
			return 0;
		double sum = 0;
		for (int i=0; i< students.size(); i++) {
			sum += students.get(i).getCourseAverage();
		}
		return sum/students.size();
	}
	
	public void printByName() {
		sortByName();
		System.out.println("Ordered by name");
		System.out.println(toString());
	}
	
	private void sortByName() {
		// use an insertion sort
		for (int i=1; i<students.size(); i++) {
			insertItemByName(i);
		}
	}
	
	private void insertItemByName(int i) {
		Student key = students.get(i);
		int pos = i;
		while (pos > 0 && key.getName().compareTo(students.get(pos-1).getName())<0) {
			students.set(pos, students.get(pos-1));
			pos--;
		}
		students.set(pos, key);
	}
	
	public void printById() {
		sortByID();
		System.out.println("Ordered by ID");
		System.out.println(toString());
	}

	private void sortByID() {
		// use an insertion sort
		for (int i=1; i<students.size(); i++) {
			insertItemByID(i);
		}		
	}
	
	private void insertItemByID(int i) {
		Student key = students.get(i);
		int pos = i;
		while (pos > 0 && key.getId().compareTo(students.get(pos-1).getId())<0) {
			students.set(pos, students.get(pos-1));
			pos--;
		}
		students.set(pos, key);
	}
	
	public void printByCourseAverage() {
		sortByCourseAverage(true);
		System.out.println("Ordered by Course Average");
		System.out.println(toString());
	}
	
	public void sortByCourseAverage(boolean ascending) {
		// use an insertion sort
		for (int i=1; i<students.size(); i++) {
			insertItemByCourseAverage(i);
		}				
	}
	
	private void insertItemByCourseAverage(int i) {
		Student key = students.get(i);
		int pos = i;
		while (pos > 0 && key.getCourseAverage()<students.get(pos-1).getCourseAverage()) {
			students.set(pos, students.get(pos-1));
			pos--;
		}
		students.set(pos, key);
	}
	
	public String toString() {
		String separator = "------------------------------------------\n";
		StringBuffer s = new StringBuffer("Course: " + courseName + " " + title + "\n"
				+ "   instructor: " + instructor + ", semester " + semester + "\n"
		   + "The maximum average: " + fmt.format(getMaxAverage()) +
	     ", the minimum average: " + fmt.format(getMinAverage()) +
	     ", the average is " + fmt.format(getAverage()) + "\n"
		+"Students: \n");
		s.append(separator);
		for (int i = 0; i<students.size(); i++)
			s.append(students.get(i).toString() + separator);
		return s.toString();
	}
	
	
}