package com.vincent.rsf.server.common.interceptor.severlet;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.util.*;

public class ParameterAddableRequest extends HttpServletRequestWrapper {
    private final Map<String, String[]> additionalParams = new HashMap<>();

    public ParameterAddableRequest(HttpServletRequest request) {
        super(request);
    }

    /**
     * 添加新参数
     * @param name 参数名
     * @param value 参数值
     */
    public void addParameter(String name, String value) {
        additionalParams.put(name, new String[]{value});
    }

    /**
     * 添加新参数（多值）
     * @param name 参数名
     * @param values 参数值数组
     */
    public void addParameter(String name, String[] values) {
        additionalParams.put(name, values);
    }

    @Override
    public String getParameter(String name) {
        if (additionalParams.containsKey(name)) {
            return additionalParams.get(name)[0];
        }
        return super.getParameter(name);
    }

    @Override
    public Map<String, String[]> getParameterMap() {
        Map<String, String[]> combinedMap = new HashMap<>(super.getParameterMap());
        combinedMap.putAll(additionalParams);
        return Collections.unmodifiableMap(combinedMap);
    }

    @Override
    public Enumeration<String> getParameterNames() {
        Set<String> names = new HashSet<>(Collections.list(super.getParameterNames()));
        names.addAll(additionalParams.keySet());
        return Collections.enumeration(names);
    }

    @Override
    public String[] getParameterValues(String name) {
        if (additionalParams.containsKey(name)) {
            return additionalParams.get(name);
        }
        return super.getParameterValues(name);
    }
}