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#include "search/locality_finder.hpp"
#include "search/dummy_rank_table.hpp"
#include "search/mwm_context.hpp"
#include "indexer/ftypes_matcher.hpp"
#include "indexer/index.hpp"
#include "base/assert.hpp"
#include "base/stl_helpers.hpp"
#include "std/algorithm.hpp"
namespace search
{
namespace
{
double const kMaxCityRadiusMeters = 30000.0;
double const kInflateRectMercator = 0.001;
class DoLoader
{
public:
DoLoader(MwmContext const & ctx, LocalityFinder::Cache & cache, RankTable const & ranks,
int8_t lang)
: m_ctx(ctx), m_cache(cache), m_ranks(ranks), m_lang(lang)
{
}
void operator()(uint32_t id) const
{
if (m_ranks.Get(id) == 0)
return;
FeatureType ft;
if (!m_ctx.GetFeature(id, ft))
return;
if (ft.GetFeatureType() != feature::GEOM_POINT)
return;
using namespace ftypes;
switch (IsLocalityChecker::Instance().GetType(ft))
{
case CITY:
case TOWN: break;
default: // cache only cities and towns at this moment
return;
}
if (m_cache.m_loadedIds.count(id) > 0)
return;
uint32_t const population = ftypes::GetPopulation(ft);
if (population == 0)
return;
double const radius = ftypes::GetRadiusByPopulation(population);
m2::RectD const rect = MercatorBounds::RectByCenterXYAndSizeInMeters(ft.GetCenter(), radius);
if (!rect.IsIntersect(m_cache.m_rect))
return;
// read item
string name;
if (!ft.GetName(m_lang, name) && !ft.GetName(0, name))
return;
LocalityItem item(name, population, id);
m_cache.m_tree.Add(item, rect);
m_cache.m_loadedIds.insert(id);
}
private:
MwmContext const & m_ctx;
LocalityFinder::Cache & m_cache;
RankTable const & m_ranks;
int8_t const m_lang;
};
class DoSelectLocality
{
public:
DoSelectLocality(string & name, m2::PointD const & pt)
: m_name(name), m_pt(pt), m_bestScore(numeric_limits<double>::max())
{
}
void operator()(m2::RectD const & rect, LocalityItem const & item)
{
// TODO (@y, @m): replace this naive score by p-values on
// multivariate Gaussian.
double const distanceMeters = MercatorBounds::DistanceOnEarth(rect.Center(), m_pt);
double const score =
ftypes::GetPopulationByRadius(distanceMeters) / static_cast<double>(item.m_population);
if (score < m_bestScore)
{
m_bestScore = score;
m_name = item.m_name;
}
}
private:
string & m_name;
m2::PointD m_pt;
double m_bestScore;
};
} // namespace
// LocalityItem ------------------------------------------------------------------------------------
LocalityItem::LocalityItem(string const & name, uint32_t population, uint32_t id)
: m_name(name), m_population(population), m_id(id)
{
}
// LocalityFinder ----------------------------------------------------------------------------------
LocalityFinder::LocalityFinder(Index const & index) : m_index(index), m_lang(0) {}
void LocalityFinder::SetLanguage(int8_t lang)
{
if (m_lang == lang)
return;
ClearCache();
m_lang = lang;
}
void LocalityFinder::UpdateCache(Cache & cache, m2::PointD const & pt)
{
m2::RectD rect = MercatorBounds::RectByCenterXYAndSizeInMeters(pt, kMaxCityRadiusMeters);
if (cache.m_rect.IsRectInside(rect))
return;
rect.Add(cache.m_rect);
rect.Inflate(kInflateRectMercator, kInflateRectMercator);
if (!m_worldId.IsAlive())
{
m_worldId.Reset();
m_ranks.reset();
vector<shared_ptr<MwmInfo>> mwmsInfo;
m_index.GetMwmsInfo(mwmsInfo);
for (auto const & info : mwmsInfo)
{
MwmSet::MwmId id(info);
Index::MwmHandle handle = m_index.GetMwmHandleById(id);
MwmValue const * value = handle.GetValue<MwmValue>();
if (handle.IsAlive() && value->GetHeader().GetType() == feature::DataHeader::world)
{
m_worldId = id;
m_ranks = RankTable::Load(value->m_cont);
break;
}
}
if (!m_ranks)
m_ranks = make_unique<DummyRankTable>();
}
ASSERT(m_ranks.get(), ());
Index::MwmHandle handle = m_index.GetMwmHandleById(m_worldId);
if (!handle.IsAlive())
return;
cache.m_rect = rect;
MwmContext ctx(move(handle));
ctx.ForEachIndex(rect, DoLoader(ctx, cache, *m_ranks, m_lang));
}
void LocalityFinder::GetLocality(m2::PointD const & pt, string & name)
{
Cache * working = nullptr;
// Find suitable cache that includes needed point.
for (auto & cache : m_caches)
{
if (cache.m_rect.IsPointInside(pt))
{
working = &cache;
break;
}
}
if (working == nullptr)
{
// Find most unused cache.
working =
&*min_element(begin(m_caches), end(m_caches), my::LessBy(&LocalityFinder::Cache::m_usage));
working->Clear();
}
UpdateCache(*working, pt);
working->GetLocality(pt, name);
}
void LocalityFinder::ClearCache()
{
for (auto & cache : m_caches)
cache.Clear();
}
// LocalityFinder::Cache ---------------------------------------------------------------------------
void LocalityFinder::Cache::Clear()
{
m_usage = 0;
m_tree.Clear();
m_loadedIds.clear();
m_rect.MakeEmpty();
}
void LocalityFinder::Cache::GetLocality(m2::PointD const & pt, string & name)
{
++m_usage;
m_tree.ForEachInRectEx(m2::RectD(pt, pt), DoSelectLocality(name, pt));
}
string DebugPrint(LocalityItem const & item)
{
stringstream ss;
ss << "Name = " << item.m_name << "Population = " << item.m_population << "ID = " << item.m_id;
return ss.str();
}
} // namespace search
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