#include "render/source/BrickPager.hpp"
#include "data/store/ChunkedVolumeStore.hpp"
#include "core/algo/GprVolumeBuilder.hpp"
#include <gtest/gtest.h>
#include <filesystem>
using namespace geopro;
namespace {
data::ChunkedVolumeStore makeStore(const std::string& dir){
  geopro::core::BuiltI16 b; b.vol=geopro::core::ScalarVolumeI16(128,128,128);
  for(auto& v: b.vol.data()) v=3;
  b.quant={1.0,0.0}; b.origin={{0,0,0}}; b.spacing={{1,1,1}}; b.vminPhys=0; b.vmaxPhys=3;
  data::ChunkedVolumeStore::write(dir, b, 64);   // 2×2×2=8 个 brick(level0)
  return data::ChunkedVolumeStore(dir);
}
}
TEST(BrickPager, BoundedMemoryLruEviction){
  auto dir=(std::filesystem::temp_directory_path()/"gpr_pager").string();
  std::filesystem::remove_all(dir);
  auto store = makeStore(dir);
  render::BrickPager pager(store, 4);
  EXPECT_EQ(pager.budget(), 4u);
  EXPECT_EQ(pager.residentCount(), 0u);
  std::vector<render::BrickId> six = {
    {0,0,0,0},{0,1,0,0},{0,0,1,0},{0,1,1,0},{0,0,0,1},{0,1,0,1} };
  pager.requestVisible(six);
  EXPECT_EQ(pager.residentCount(), 4u);            // 恒定 ≤ budget
  EXPECT_EQ(pager.get(six[0]), nullptr);            // 最早请求→已淘汰
  EXPECT_EQ(pager.get(six[1]), nullptr);
  ASSERT_NE(pager.get(six[5]), nullptr);            // 最近请求→驻留
  EXPECT_EQ(pager.get(six[5])->size(), 64u*64*64);
  // 再请求一个已驻留 + 一个新的,验证 LRU 更新与恒定驻留
  pager.requestVisible({ six[5], {0,1,1,1} });
  EXPECT_LE(pager.residentCount(), 4u);
  EXPECT_NE(pager.get(six[5]), nullptr);            // 刚 touch,仍在
  std::filesystem::remove_all(dir);
}