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#include "query_saver.hpp"
#include "platform/settings.hpp"
#include "coding/hex.hpp"
#include "coding/reader.hpp"
#include "coding/writer.hpp"
namespace
{
size_t constexpr kMaxSuggestCount = 10;
char constexpr kSettingsKey[] = "UserQueries";
using TLength = uint16_t;
size_t constexpr kLengthTypeSize = sizeof(TLength);
} // namespace
namespace search
{
QuerySaver::QuerySaver()
{
Load();
}
void QuerySaver::Add(string const & query)
{
if (query.empty())
return;
// Remove items if needed.
auto const it = find(m_topQueries.begin(), m_topQueries.end(), query);
if (it != m_topQueries.end())
m_topQueries.erase(it);
else if (m_topQueries.size() >= kMaxSuggestCount)
m_topQueries.pop_back();
// Add new query and save it to drive.
m_topQueries.push_front(query);
Save();
}
void QuerySaver::Clear()
{
m_topQueries.clear();
Settings::Delete(kSettingsKey);
}
void QuerySaver::Serialize(vector<uint8_t> & data) const
{
data.clear();
MemWriter<vector<uint8_t>> writer(data);
TLength size = m_topQueries.size();
writer.Write(&size, kLengthTypeSize);
for (auto const & query : m_topQueries)
{
size = query.size();
writer.Write(&size, kLengthTypeSize);
writer.Write(query.c_str(), size);
}
}
void QuerySaver::Deserialize(string const & data)
{
MemReader rawReader(data.c_str(), data.size());
ReaderSource<MemReader> reader(rawReader);
TLength queriesCount;
reader.Read(&queriesCount, kLengthTypeSize);
for (TLength i = 0; i < queriesCount; ++i)
{
TLength stringLength;
reader.Read(&stringLength, kLengthTypeSize);
vector<char> str(stringLength);
reader.Read(&str[0], stringLength);
m_topQueries.emplace_back(&str[0], stringLength);
}
}
void QuerySaver::Save()
{
vector<uint8_t> data;
Serialize(data);
Settings::Set(kSettingsKey, ToHex(&data[0], data.size()));
}
void QuerySaver::Load()
{
string hexData;
Settings::Get(kSettingsKey, hexData);
if (hexData.empty())
return;
Deserialize(FromHex(hexData));
}
} // namesapce search
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