DataInput

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import java.util.HashMap;
import java.util.Scanner;
import java.util.TreeSet;
import model.Student;

/**
 *
 * @author phuon
 */
public class DataInput {

    public int inputInt(String mode, int min, int max) {
        Scanner scanner = new Scanner(System.in);
        while (true) {
            String raw = scanner.nextLine().trim();
            if (!raw.isEmpty()) {
                try {
                    int number = Integer.parseInt(raw);
                    if (number >= min && number <= max) {
                        return number;
                    } else {
                        System.out.print(mode + " must in range "
                                + "[" + min + ", " + max + "], enter again: ");
                    }
                } catch (NumberFormatException e) {
                    System.out.print(mode + " must be a number, enter again: ");
                }
            } else {
                System.out.print(mode + " can not be empty, enter again: ");
            }
        }
    }

    public String inputID() {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter ID: ");
        while (true) {
            String id = scanner.nextLine().trim();
            if (!id.isEmpty()) {
                return id;
            } else {
                System.out.print("ID can not be empty, enter again: ");
            }
        }
    }

    public String inputExistedID(HashMap<String, TreeSet<Student>> records) {
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.print("Enter ID: ");
            String id = scanner.nextLine().trim();
            if (!id.isEmpty()) {
                if (records.containsKey(id)) {
                    return id;
                } else {
                    System.out.print("ID " + id + " is not exist, enter again: ");
                }
            } else {
                System.out.print("ID can not be empty, enter again: ");
            }
        }
    }

    public String inputName() {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter Name: ");
        while (true) {
            String name = scanner.nextLine().trim();
            if (!name.isEmpty()) {
                if (isValidName(name)) {
                    return name;
                } else {
                    System.out.print("Name can not contains special character or digits, enter again: ");
                }
            } else {
                System.out.print("Name can not be empty, enter again: ");
            }
        }
    }

    public String inputCourseName() {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter course name: ");
        while (true) {
            String courseName = scanner.nextLine().trim();
            if (!courseName.isEmpty()) {
                boolean isValid = false;
                if (courseName.equals("Java") || courseName.equals(".Net") || courseName.equals("C/C++")) {
                    return courseName;
                } else {
                    System.out.print("Course name only one of three courses Java, .Net or C/C++\n"
                            + "Enter again: ");
                }
            } else {
                System.out.print("Course name can not be empty, enter again: ");
            }
        }
    }

    public boolean isAOrB(String a, String b) {
        Scanner scanner = new Scanner(System.in);

        while (true) {
            String choice = scanner.nextLine().trim();
            if (!choice.isEmpty()) {
                if (choice.equals(a)) {
                    return true;
                } else if (choice.equals(b)) {
                    return false;
                } else {
                    System.out.print("You can only enter \"" + a + "\" or \"" + b + "\": ");
                }
            } else {
                System.out.print("Choice can not be empty, enter again: ");
            }

        }
    }

    private boolean isValidName(String name) {
        for (int i = 0; i < name.length(); i++) {
            char c = name.charAt(i);
            if (!Character.isLetter(c) && c != ' ') {
                return false;
            }
        }
        return true;
    }
}