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#include "search/locality_finder.hpp"
#include "search/mwm_context.hpp"
#include "indexer/ftypes_matcher.hpp"
namespace search
{
double const kMaxCityRadiusMeters = 30000.0;
double const kInflateRectMercator = 1.0E-3;
class DoLoader
{
public:
DoLoader(LocalityFinder const & finder, LocalityFinder::Cache & cache)
: m_finder(finder), m_cache(cache)
{
}
void operator() (FeatureType & ft) const
{
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;
}
uint32_t const id = ft.GetID().m_index;
if (m_cache.m_loaded.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_finder.m_lang, name))
if (!ft.GetName(0, name))
return;
LocalityItem item(population, id, name);
m_cache.m_tree.Add(item, rect);
m_cache.m_loaded.insert(id);
}
private:
LocalityFinder const & m_finder;
LocalityFinder::Cache & m_cache;
};
class DoSelectLocality
{
public:
DoSelectLocality(string & name, m2::PointD const & p)
: m_name(name) , m_point(p), m_bestValue(numeric_limits<double>::max())
{
}
void operator() (m2::RectD const & rect, LocalityItem const & item)
{
double const d = MercatorBounds::DistanceOnEarth(rect.Center(), m_point);
double const value = ftypes::GetPopulationByRadius(d) / static_cast<double>(item.m_population);
if (value < m_bestValue)
{
m_bestValue = value;
m_name = item.m_name;
}
}
private:
string & m_name;
m2::PointD m_point;
double m_bestValue;
};
LocalityItem::LocalityItem(uint32_t population, ID id, string const & name)
: m_name(name), m_population(population), m_id(id)
{
}
string DebugPrint(LocalityItem const & item)
{
stringstream ss;
ss << "Name = " << item.m_name << "Population = " << item.m_population << "ID = " << item.m_id;
return ss.str();
}
LocalityFinder::LocalityFinder(Index const * pIndex)
: m_pIndex(pIndex), m_lang(0)
{
}
void LocalityFinder::UpdateCache(Cache & cache, m2::PointD const & pt) const
{
m2::RectD rect = MercatorBounds::RectByCenterXYAndSizeInMeters(pt, kMaxCityRadiusMeters);
if (cache.m_rect.IsRectInside(rect))
return;
rect.Add(cache.m_rect);
rect.Inflate(kInflateRectMercator, kInflateRectMercator);
vector<shared_ptr<MwmInfo>> mwmsInfo;
m_pIndex->GetMwmsInfo(mwmsInfo);
for (auto const & info : mwmsInfo)
{
Index::MwmHandle handle = m_pIndex->GetMwmHandleById(info);
MwmValue const * value = handle.GetValue<MwmValue>();
if (handle.IsAlive() && value->GetHeader().GetType() == feature::DataHeader::world)
{
cache.m_rect = rect;
MwmContext(move(handle)).ForEachFeature(rect, DoLoader(*this, cache));
break;
}
}
}
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.
size_t minUsage = numeric_limits<size_t>::max();
for (auto & cache : m_caches)
{
if (cache.m_usage < minUsage)
{
working = &cache;
minUsage = cache.m_usage;
}
}
ASSERT(working, ());
working->Clear();
}
UpdateCache(*working, pt);
working->GetLocality(pt, name);
}
void LocalityFinder::ClearCache()
{
for (auto & cache : m_caches)
cache.Clear();
}
void LocalityFinder::Cache::Clear()
{
m_usage = 0;
m_tree.Clear();
m_loaded.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));
}
}
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