//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
//SPDX-License-Identifier: GPL-3.0-or-later

#include "formdecode.h"

#include <sstream>

std::map<std::string, std::string> urlDecodeAndParse(const std::string_view& encoded) {
    std::map<std::string, std::string> result;

    std::istringstream iss(std::string(encoded.begin(), encoded.end()));
    std::string pair;
    while (std::getline(iss, pair, '&')) {
        size_t equalsPos = pair.find('=');
        if (equalsPos != std::string::npos)
            result.emplace(
                urlDecode(pair.substr(0, equalsPos)),
                urlDecode(pair.substr(equalsPos + 1))
            );
    }

    return result;
}

std::string urlDecode(const std::string_view& encoded) {
    std::ostringstream decoded;

    for (size_t i = 0; i < encoded.length(); ++i) {
        if (encoded[i] == '%') {
            if (i + 2 < encoded.length()) {
                std::string hexStr(encoded.substr(i + 1, 2));
                char hexValue = static_cast<char>(std::stoul(hexStr, nullptr, 16));
                decoded.put(hexValue);
                i += 2;
            } else {
                decoded.put(encoded[i]);
            }
        } else if (encoded[i] == '+') {
            decoded.put(' ');
        } else {
            decoded.put(encoded[i]);
        }
    }

    return decoded.str();
}