// GprVolumeRepository：逐线 GPR int16 量化体 → app 渲染链 float 体(VolumeGrid)。
//   1) builtI16ToVolumeGrid 纯适配器：维度/反量化值/spacing/origin/vmin-vmax/kBlank→NaN。
//   2) createGprVolumeGrid 全链：合成多通道 .iprb 走真 P1/P2 链 → 反量化体维度/spacing 自洽。

#include <gtest/gtest.h>

#include <cmath>
#include <cstdint>
#include <filesystem>
#include <fstream>
#include <string>

#include "core/algo/GprVolumeBuilder.hpp"
#include "core/model/ScalarVolumeI16.hpp"
#include "data/GprVolumeRepository.hpp"

namespace fs = std::filesystem;

namespace {

// 适配器单测：手搭一个 2x1x2 的 BuiltI16(已知 quant/spacing/origin) → 校验反量化逐值。
TEST(GprVolumeRepositoryAdapter, DequantDimsSpacingAndBlank) {
  geopro::core::BuiltI16 built;
  built.vol = geopro::core::ScalarVolumeI16(2, 1, 2);
  // Quant: phys = q*scale + offset = q*0.5 + 10。
  built.quant.scale = 0.5;
  built.quant.offset = 10.0;
  built.origin = {1.0, 2.0, 3.0};
  built.spacing = {0.2, 1.37, 0.05};
  built.vminPhys = 5.0;
  built.vmaxPhys = 20.0;

  // 填 4 个体素：3 个正常值 + 1 个 kBlank。
  built.vol.at(0, 0, 0) = 4;    // phys = 4*0.5+10 = 12
  built.vol.at(1, 0, 0) = -2;   // phys = -2*0.5+10 = 9
  built.vol.at(0, 0, 1) = 20;   // phys = 20*0.5+10 = 20
  built.vol.at(1, 0, 1) = geopro::core::ScalarVolumeI16::kBlank;  // → NaN

  const geopro::data::VolumeGrid g = geopro::data::builtI16ToVolumeGrid(built);

  // 维度。
  EXPECT_EQ(g.vol.nx(), 2);
  EXPECT_EQ(g.vol.ny(), 1);
  EXPECT_EQ(g.vol.nz(), 2);

  // 反量化逐值。
  EXPECT_DOUBLE_EQ(g.vol.at(0, 0, 0), 12.0);
  EXPECT_DOUBLE_EQ(g.vol.at(1, 0, 0), 9.0);
  EXPECT_DOUBLE_EQ(g.vol.at(0, 0, 1), 20.0);
  EXPECT_TRUE(std::isnan(g.vol.at(1, 0, 1)));  // kBlank → NaN(下游透明)

  // origin/spacing 原样搬运。
  EXPECT_DOUBLE_EQ(g.origin[0], 1.0);
  EXPECT_DOUBLE_EQ(g.origin[1], 2.0);
  EXPECT_DOUBLE_EQ(g.origin[2], 3.0);
  EXPECT_DOUBLE_EQ(g.spacing[0], 0.2);
  EXPECT_DOUBLE_EQ(g.spacing[1], 1.37);
  EXPECT_DOUBLE_EQ(g.spacing[2], 0.05);

  // 物理值域 = BuiltI16 的 vminPhys/vmaxPhys。
  EXPECT_DOUBLE_EQ(g.vmin, 5.0);
  EXPECT_DOUBLE_EQ(g.vmax, 20.0);
  EXPECT_TRUE(g.valid());
}

// 写一个合成通道：.iprh 文本头 + .iprb 纯 int16 波形([trace*samples + s]，s 最快)。
// 与 test_gpr3dv_volume_bridge 同口径，确保 createGprVolumeGrid 走真 P1/P2 链。
void writeSyntheticChannel(const fs::path& iprhPath, int samples, int traces,
                           std::int16_t base, double chYOffset,
                           double distanceInterval, double timeWindowNs,
                           double soilVelocity, int channels) {
  std::ofstream h(iprhPath);
  h << "SAMPLES: " << samples << "\n";
  h << "LAST TRACE: " << (traces - 1) << "\n";
  h << "CHANNELS: " << channels << "\n";
  h << "TIMEWINDOW: " << timeWindowNs << "\n";
  h << "SOIL VELOCITY: " << soilVelocity << "\n";
  h << "DISTANCE INTERVAL: " << distanceInterval << "\n";
  h << "CH_Y_OFFSET: " << chYOffset << "\n";
  h.close();

  fs::path iprbPath = iprhPath;
  iprbPath.replace_extension(".iprb");
  std::ofstream b(iprbPath, std::ios::binary);
  for (int t = 0; t < traces; ++t) {
    for (int s = 0; s < samples; ++s) {
      const std::int16_t v = static_cast<std::int16_t>(base + t + s);
      b.write(reinterpret_cast<const char*>(&v), sizeof(v));
    }
  }
}

class GprVolumeRepositoryChainTest : public ::testing::Test {
 protected:
  void SetUp() override {
    dir_ = fs::temp_directory_path() / "gpr_volume_repo_test";
    std::error_code ec;
    fs::remove_all(dir_, ec);
    fs::create_directories(dir_);
  }
  void TearDown() override {
    std::error_code ec;
    fs::remove_all(dir_, ec);
  }
  fs::path dir_;
};

TEST_F(GprVolumeRepositoryChainTest, FullChainProducesValidVolumeGrid) {
  const int samples = 64;
  const int traces = 40;
  const int channels = 2;
  const double dxHeader = 0.05;
  const double timeWindowNs = 100.0;
  const double soilVel = 0.1;

  writeSyntheticChannel(dir_ / "syn_001_A01.iprh", samples, traces,
                        /*base=*/100, /*chYOffset=*/-0.5, dxHeader, timeWindowNs,
                        soilVel, channels);
  writeSyntheticChannel(dir_ / "syn_001_A02.iprh", samples, traces,
                        /*base=*/300, /*chYOffset=*/0.5, dxHeader, timeWindowNs,
                        soilVel, channels);

  // coarse=2：沿测线下采样，dx ×2 保形。
  geopro::data::VolumeGrid g;
  ASSERT_NO_THROW(
      { g = geopro::data::createGprVolumeGrid(dir_.string(), "syn_001", 2); });

  // 维度：Y=通道数；X/Z 正。
  EXPECT_EQ(g.vol.ny(), channels);
  EXPECT_GT(g.vol.nx(), 0);
  EXPECT_GT(g.vol.nz(), 0);

  // spacing：X=道距×coarse、Y=通道横距(跨度1.0/(2-1)=1.0)、Z=深度采样距>0。
  EXPECT_DOUBLE_EQ(g.spacing[0], dxHeader * 2);
  EXPECT_NEAR(g.spacing[1], 1.0, 1e-6);
  EXPECT_GT(g.spacing[2], 0.0);

  // origin=0；值域自洽(vmin<=vmax，搬自 BuiltI16.vminPhys/vmaxPhys，处理后极小合成
  // 数据可能退化为相等区间 → 与 io::gpr 桥接同口径，不强求严格 <)。
  EXPECT_DOUBLE_EQ(g.origin[0], 0.0);
  EXPECT_DOUBLE_EQ(g.origin[1], 0.0);
  EXPECT_DOUBLE_EQ(g.origin[2], 0.0);
  EXPECT_LE(g.vmin, g.vmax);

  // 稠密体：抽查角点为有限值(非 NaN)——GPR 立方体每体素有值，反量化后无空洞。
  EXPECT_TRUE(std::isfinite(g.vol.at(0, 0, 0)));
  EXPECT_TRUE(std::isfinite(g.vol.at(g.vol.nx() - 1, g.vol.ny() - 1,
                                     g.vol.nz() - 1)));
}

TEST_F(GprVolumeRepositoryChainTest, ThrowsOnMissingLine) {
  EXPECT_THROW(geopro::data::createGprVolumeGrid(dir_.string(), "nope", 1),
               std::runtime_error);
}

}  // namespace