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

TEST(NormalizedRadarHead, ParsesCoreFieldsAndDerivesTraces) {
  const std::string head =
      "SAMPLES:516\nNUMBER_OF_CH:16\nLAST_TRACE:60448\nBITS:16\nENDIAN_TYPE:1\n"
      "DISTANCE_INTERVAL:0.099194\nTIMEWINDOW:96.419553\nDIELECTRIC:\n"
      "CH_X_OFFSETS:0.080 0.160 0.240 0.320 0.400 0.480 0.560 0.640 0.720 0.800 "
      "0.880 0.960 1.040 1.120 1.200 1.280\n";
  const RadarHeader h = parseRadarHead(head);
  EXPECT_EQ(h.samples, 516);
  EXPECT_EQ(h.channels, 16);
  EXPECT_EQ(h.lastTrace, 60448);
  EXPECT_EQ(h.traces, 3778);          // 60448/16
  EXPECT_EQ(h.bits, 16);
  EXPECT_EQ(h.endianType, 1);
  EXPECT_DOUBLE_EQ(h.distanceInterval, 0.099194);
  ASSERT_EQ(h.chXOffsets.size(), 16u);
  EXPECT_DOUBLE_EQ(h.chXOffsets.front(), 0.080);
  EXPECT_DOUBLE_EQ(h.chXOffsets.back(), 1.280);
}

TEST(NormalizedRadarHead, MissingRequiredFieldThrows) {
  EXPECT_THROW(parseRadarHead("SAMPLES:516\nNUMBER_OF_CH:16\n"), std::runtime_error);
}

TEST(NormalizedRadarHead, DepthSpacingUsesDefaultVelocityWhenNoDielectric) {
  const std::string head = "SAMPLES:516\nNUMBER_OF_CH:16\nLAST_TRACE:32\n"
                           "TIMEWINDOW:96.419553\nDIELECTRIC:\n";
  const RadarHeader h = parseRadarHead(head);
  EXPECT_NEAR(waveVelocityMperNs(h), 0.1, 1e-9);            // 无介电 → 默认 0.1
  const double dz = depthSpacingZ(h);
  EXPECT_NEAR(dz, (96.419553 / 515.0) * 0.1 / 2.0, 1e-9);
}