package publicway;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.geom.RoundRectangle2D;

/**
 * 返回按钮工具类
 * 提供统一的返回按钮创建方法，左侧显示"返回"文字，右侧显示图标
 */
public final class Fanhuibutton {
    
    // 按钮固定尺寸
    private static final Dimension BUTTON_SIZE = new Dimension(150, 30);
    // 圆角半径
    private static final int CORNER_RADIUS = 8;
    // 主色调 (绿色)
    private static final Color BASE_COLOR = new Color(46, 139, 87);
    
    private Fanhuibutton() {
        // 工具类不需要实例化
    }
    
    /**
     * 创建返回按钮
     * 样式参考 buttonset，显示 "返回 >>"
     * 
     * @param listener 按钮点击事件监听器
     * @return 配置好的返回按钮
     */
    public static JButton createReturnButton(ActionListener listener) {
        // 创建自定义绘制的按钮
        JButton returnButton = new JButton("返回 >>") {
            private static final long serialVersionUID = 1L;

            @Override
            protected void paintComponent(Graphics g) {
                Graphics2D g2 = (Graphics2D) g.create();
                // 开启抗锯齿
                g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
                g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

                // 获取按钮状态
                boolean isPressed = getModel().isPressed();
                boolean isRollover = getModel().isRollover();
                int w = getWidth();
                int h = getHeight();

                // 计算当前背景色
                if (isPressed) {
                    g2.setColor(BASE_COLOR.darker());
                } else if (isRollover) {
                    g2.setColor(new Color(BASE_COLOR.getRed(), BASE_COLOR.getGreen(), BASE_COLOR.getBlue(), 220));
                } else {
                    g2.setColor(BASE_COLOR);
                }

                // 绘制圆角矩形背景
                g2.fill(new RoundRectangle2D.Double(0, 0, w, h, CORNER_RADIUS, CORNER_RADIUS));

                // 绘制文字
                g2.setColor(Color.WHITE);
                g2.setFont(getFont());
                FontMetrics fm = g2.getFontMetrics();
                
                // 文字居中
                String text = getText();
                int textX = (w - fm.stringWidth(text)) / 2;
                int textY = (h - fm.getHeight()) / 2 + fm.getAscent();
                
                g2.drawString(text, textX, textY);

                g2.dispose();
            }
        };
        
        // 设置按钮样式属性
        returnButton.setFont(new Font("微软雅黑", Font.BOLD, 14));
        returnButton.setForeground(Color.WHITE);
        returnButton.setFocusPainted(false);
        returnButton.setContentAreaFilled(false);
        returnButton.setBorderPainted(false);
        returnButton.setCursor(new Cursor(Cursor.HAND_CURSOR));
        
        // 设置固定大小
        returnButton.setPreferredSize(BUTTON_SIZE);
        returnButton.setMinimumSize(BUTTON_SIZE);
        returnButton.setMaximumSize(BUTTON_SIZE);
        
        // 添加点击事件
        if (listener != null) {
            returnButton.addActionListener(listener);
        }
        
        return returnButton;
    }
}