package model;

import java.util.Random;

public abstract class Student {
    protected String name;
    protected String password;
    protected String path;
    protected Random random;

    public Student(String name, String password, String path) {
        this.name = name;
        this.password = password;
        this.path = path;
        this.random = new Random();
    }

    /**
     * 生成有效的括号位置
     * 确保括号不会包围整个表达式
     *
     * @param operands 操作数数量
     * @return 包含起始和结束位置的数组 [parenStart, parenEnd]
     */
    protected int[] bracketMaker(int operands) {
        boolean useParen = operands > 2 && random.nextBoolean();
        int parenStart = 0;
        int parenEnd = operands - 1;

        while (parenStart == 0 && parenEnd == operands - 1) {
            parenStart = useParen ? random.nextInt(operands - 1) : -2;
            parenEnd = useParen ? random.nextInt(operands - 1 - parenStart) + parenStart + 1 : -2;
        }

        return new int[]{parenStart, parenEnd};
    }

    /**
     * 随机选择特殊操作符的位置
     *
     * @param operands 操作数数量
     * @return 标记特殊操作符位置的布尔数组
     */
    protected boolean[] randomMaker(int operands) {
        int specialNumber = Math.min(operands, random.nextInt(operands) + 1);
        boolean[] specialOpFlags = new boolean[operands];

        for (int i = 0; i < specialNumber; i++) {
            int pos;
            do {
                pos = random.nextInt(operands);
            } while (specialOpFlags[pos]);
            specialOpFlags[pos] = true;
        }

        return specialOpFlags;
    }

    protected abstract String makeOneQuestion();

}