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/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.tomakehurst.wiremock.extension.responsetemplating.helpers;

import com.github.tomakehurst.wiremock.common.ListOrSingle;

import java.net.URLDecoder;
import java.util.LinkedHashMap;
import java.util.Map;

import static com.github.tomakehurst.wiremock.common.Exceptions.throwUnchecked;

public class FormParser {

    public static Map> parse(String formText, boolean urlDecode) {
        return parse(formText, urlDecode, "utf-8");
    }

    public static Map> parse(String formText, boolean urlDecode, String encoding) {
        Map> map = new LinkedHashMap<>();

        for (String formField: formText.split("&")) {
            String[] parts = formField.split("=");
            if (parts.length > 1) {
                String key = parts[0];
                String value = urlDecode ?
                        urlDecode(parts[1].trim(), encoding) :
                        parts[1].trim();

                ListOrSingle existing = map.get(key);
                if (existing != null) {
                    existing.add(value);
                } else {
                    map.put(key, ListOrSingle.of(value));
                }

            }
        }

        return map;
    }

    private static String urlDecode(String text, String encoding) {
        try {
            return URLDecoder.decode(text, encoding);
        } catch (Exception e) {
            return throwUnchecked(e, String.class);
        }
    }
}