package com.xly.util;

import org.springframework.expression.ExpressionParser;
import org.springframework.expression.common.TemplateParserContext;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;

import java.util.Map;

/**
 * 动态文本注入工具类
 */
public class DynamicTextInjector {

    /**
     * 使用Spring EL表达式注入
     */
    public static String injectWithSpEL(String template, Map<String, Object> variables) {
        ExpressionParser parser = new SpelExpressionParser();
        StandardEvaluationContext context = new StandardEvaluationContext();

        // 设置变量
        variables.forEach(context::setVariable);

        // 解析模板
        return parser.parseExpression(template,
                new TemplateParserContext()).getValue(context, String.class);
    }

    /**
     * 自定义模板解析
     */
    public static String injectCustom(String template, Map<String, Object> params) {
        String result = template;

        // 替换 {{variable}} 格式
        for (Map.Entry<String, Object> entry : params.entrySet()) {
            String placeholder = "{{" + entry.getKey() + "}}";
            result = result.replace(placeholder,
                    entry.getValue() != null ? entry.getValue().toString() : "");
        }

        // 替换 ${variable} 格式
        for (Map.Entry<String, Object> entry : params.entrySet()) {
            String placeholder = "${" + entry.getKey() + "}";
            result = result.replace(placeholder,
                    entry.getValue() != null ? entry.getValue().toString() : "");
        }

        return result;
    }
}