#include "Encrypt.h"
#include <array>
#include <boost/algorithm/hex.hpp>
#include <boost/algorithm/string/trim.hpp>
#include <boost/archive/iterators/base64_from_binary.hpp>
#include <boost/archive/iterators/binary_from_base64.hpp>
#include <boost/archive/iterators/transform_width.hpp>
#include <boost/uuid/detail/sha1.hpp>

std::string Encrypt::encode64(const char *data, size_t size) {
    using namespace boost::archive::iterators;
    using Iterator = base64_from_binary<transform_width<const char *, 6, 8>>;
    auto tmp = std::string(Iterator(data), Iterator(data + size));
    return tmp.append((3 - size % 3) % 3, '=');
}

std::string Encrypt::encode64(const std::string_view &data) {
    return encode64(data.data(), data.size());
}

std::string Encrypt::decode64(const std::string_view &data) {
    using namespace boost::archive::iterators;
    using Iterator = transform_width<binary_from_base64<std::string_view::const_iterator>, 8, 6>;

    std::string binary(Iterator(std::cbegin(data)), Iterator(std::cend(data)));

    //    return boost::algorithm::trim_right_copy_if(binary, [](char c) { return c == '\0'; });

    // Remove padding.
    auto length = data.size();
    if (binary.size() > 2 && data[length - 1] == '=' && data[length - 2] == '=') {
        binary.erase(binary.end() - 2, binary.end());
    } else if (binary.size() > 1 && data[length - 1] == '=') {
        binary.erase(binary.end() - 1, binary.end());
    }
    return binary;
}

std::string Encrypt::sha1sum(const std::string_view &data, Sha1DigestType &digest) {
    return sha1sum(data.data(), data.size(), digest);
}

std::string Encrypt::sha1sum(const char *data, size_t size, Sha1DigestType &digest) {
    boost::uuids::detail::sha1 sha1;
    sha1.process_bytes(data, size);
    sha1.get_digest(digest);

    std::ostringstream oss;
    for (int i = 0; i < 5; ++i) oss << std::hex << std::setfill('0') << std::setw(8) << digest[i];

    return oss.str();
}

std::string Encrypt::sha1sum(const std::vector<char> &data, Sha1DigestType &digest) {
    return sha1sum(data.data(), data.size(), digest);
}