#include "io/gpr/GprGeometry.hpp"
#include "io/gpr/IprHeader.hpp"
#include <gtest/gtest.h>
using namespace geopro::io::gpr;

TEST(GprGeometry, ParsesActiveChannelOffsets) {
  const std::string ord = "0 -0.686000 -1.5 1\n1 -0.581000 -1.5 1\n14 0 -1.5 0\n";
  auto xs = parseChannelXOffsets(ord);
  ASSERT_EQ(xs.size(), 2u);  // 仅 2 个有效(末列=1)
  EXPECT_NEAR(xs[0], -0.686, 1e-6);
  EXPECT_NEAR(xs[1], -0.581, 1e-6);
}

TEST(GprGeometry, DepthOfLastSampleMatchesPhysics) {
  IprHeader h{};
  h.samples = 821;
  h.timeWindowNs = 160.352;
  h.soilVelocity = 1e8;  // m/s
  EXPECT_NEAR(depthOfSample(820, h), 8.0, 0.05);  // ~8m
  EXPECT_NEAR(depthOfSample(0, h), 0.0, 1e-9);
}