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Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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THE SOFTWARE.
*/

#include <algorithm>

#include <hip_test_common.hh>

#include <hip/hip_fp4.h>

template <typename Lambda, typename... Type>
static __global__ void lambda_kernel_launch(Lambda l, Type... args) {
  l(args...);
}

/**
 * Test Description
 * ------------------------
 *  - Basic test to convert given double type data to FP4 type with E2M1
 * format.
 * Test source
 * ------------------------
 *  - /unit/deviceLib/fp4_ocp.cc
 * Test requirements
 * ------------------------
 *  - HIP_VERSION >= 6.5
 */
TEST_CASE("Unit_all_fp4_from_double") {
  SECTION("sanityx1") {
    std::vector<double> inputs{-1.0, 0.0, 1.0};
    for (const auto input : inputs) {
      __hip_fp4_e2m1 fp4(input);
      double ret = fp4;
      INFO("Original: " << input << " Return: " << ret);
      REQUIRE(ret == input);
    }
  }
  SECTION("sanityx2") {
    std::vector<double2> inputs{{-1.0, 1.0}, {-2.0, 2.0}};
    for (const auto input : inputs) {
      __hip_fp4x2_e2m1 fp4x2(input);
      double2 ret = fp4x2;
      INFO("Original: " << input.x << " Return: " << ret.x);
      INFO("Original: " << input.y << " Return: " << ret.y);

      REQUIRE(ret.x == input.x);
      REQUIRE(ret.y == input.y);
    }
  }
  SECTION("sanityx4") {
    std::vector<double4> inputs{
        {-1.0, 0.5, 1.5, 1.0}, {-2.0, 0.5, 1.5, 2.0}, {-3.0, 0.5, 1.5, 3.0}};
    for (const auto& input : inputs) {
      __hip_fp4x4_e2m1 fp4x4(input);
      double4 ret = fp4x4;
      INFO("Original: " << input.x << ", " << input.y << ", " << input.z << ", " << input.w
                        << " Return: " << ret.x << ", " << ret.y << ret.z << ", " << ret.w);
      REQUIRE(ret.x == input.x);
      REQUIRE(ret.y == input.y);
      REQUIRE(ret.z == input.z);
      REQUIRE(ret.w == input.w);
    }
  }
}

/**
 * Test Description
 * ------------------------
 *  - Basic test to convert given double data to FP4 type with E2M1
 * format in the device.
 * Test source
 * ------------------------
 *  - /unit/deviceLib/fp4_ocp.cc
 * Test requirements
 * ------------------------
 *  - HIP_VERSION >= 6.5
 */
TEST_CASE("Unit_all_fp4_from_double_device") {
  SECTION("sanityx1") {
    auto fp4x1_l = [] __device__(double* inputs, float* outputs, size_t size) {
      int i = threadIdx.x;
      if (i < size) {
        __hip_fp4_e2m1 fp4(inputs[i]);
        outputs[i] = fp4;
      }
    };

    std::vector<double> inputs{-1.0, 0.0, 1.0};
    double* d_in;
    float* d_out;
    HIP_CHECK(hipMalloc(&d_in, sizeof(double) * inputs.size()));
    HIP_CHECK(hipMalloc(&d_out, sizeof(float) * inputs.size()));

    HIP_CHECK(
        hipMemcpy(d_in, inputs.data(), sizeof(double) * inputs.size(), hipMemcpyHostToDevice));
    lambda_kernel_launch<<<1, 32>>>(fp4x1_l, d_in, d_out, inputs.size());
    std::vector<float> outputs(inputs.size(), 0.0f);
    HIP_CHECK(
        hipMemcpy(outputs.data(), d_out, sizeof(float) * inputs.size(), hipMemcpyDeviceToHost));

    for (size_t i = 0; i < inputs.size(); i++) {
      INFO("Original: " << inputs[i] << " Output: " << outputs[i]);
      REQUIRE(inputs[i] == outputs[i]);
    }

    HIP_CHECK(hipFree(d_in));
    HIP_CHECK(hipFree(d_out));
  }

  SECTION("sanityx2") {
    auto fp4x2_l = [] __device__(double2 * inputs, float2 * outputs, size_t size) {
      int i = threadIdx.x;
      if (i < size) {
        __hip_fp4x2_e2m1 fp4(inputs[i]);
        outputs[i] = fp4;
      }
    };

    std::vector<double2> inputs{{-1.0, 0.0}, {0.0, 1.0}, {1.0, -1.0}, {1.0, 0.0}, {0.0, -1.0}};
    double2* d_in;
    float2* d_out;
    HIP_CHECK(hipMalloc(&d_in, sizeof(double2) * inputs.size()));
    HIP_CHECK(hipMalloc(&d_out, sizeof(float2) * inputs.size()));

    HIP_CHECK(
        hipMemcpy(d_in, inputs.data(), sizeof(double2) * inputs.size(), hipMemcpyHostToDevice));
    lambda_kernel_launch<<<1, 32>>>(fp4x2_l, d_in, d_out, inputs.size());
    std::vector<float2> outputs(inputs.size());
    HIP_CHECK(
        hipMemcpy(outputs.data(), d_out, sizeof(float2) * inputs.size(), hipMemcpyDeviceToHost));

    for (size_t i = 0; i < inputs.size(); i++) {
      INFO("Original: " << inputs[i].x << ", " << inputs[i].y << " Output: " << outputs[i].x << ", "
                        << outputs[i].y);
      REQUIRE(inputs[i].x == outputs[i].x);
      REQUIRE(inputs[i].y == outputs[i].y);
    }

    HIP_CHECK(hipFree(d_in));
    HIP_CHECK(hipFree(d_out));
  }

  SECTION("sanityx4") {
    auto fp4x4_l = [] __device__(double4 * inputs, float4 * outputs, size_t size) {
      int i = threadIdx.x;
      if (i < size) {
        __hip_fp4x4_e2m1 fp4(inputs[i]);
        outputs[i] = fp4;
      }
    };

    std::vector<double4> inputs{
        {-1.0, 0.0, 1.0, 0.5}, {0.0, 1.0, -0.5, -1.0}, {1.0, 0.0, 1.0, -1.0}};
    double4* d_in;
    float4* d_out;
    HIP_CHECK(hipMalloc(&d_in, sizeof(double4) * inputs.size()));
    HIP_CHECK(hipMalloc(&d_out, sizeof(float4) * inputs.size()));

    HIP_CHECK(
        hipMemcpy(d_in, inputs.data(), sizeof(double4) * inputs.size(), hipMemcpyHostToDevice));
    lambda_kernel_launch<<<1, 32>>>(fp4x4_l, d_in, d_out, inputs.size());
    std::vector<float4> outputs(inputs.size());
    HIP_CHECK(
        hipMemcpy(outputs.data(), d_out, sizeof(float4) * inputs.size(), hipMemcpyDeviceToHost));

    for (size_t i = 0; i < inputs.size(); i++) {
      INFO("Original: " << inputs[i].x << ", " << inputs[i].y << ", " << inputs[i].z << ", "
                        << inputs[i].w << " Output: " << outputs[i].x << ", " << outputs[i].y
                        << ", " << outputs[i].z << ", " << outputs[i].w);
      REQUIRE(inputs[i].x == outputs[i].x);
      REQUIRE(inputs[i].y == outputs[i].y);
      REQUIRE(inputs[i].z == outputs[i].z);
      REQUIRE(inputs[i].w == outputs[i].w);
    }

    HIP_CHECK(hipFree(d_in));
    HIP_CHECK(hipFree(d_out));
  }
}

/**
 * Test Description
 * ------------------------
 *  - Basic test to convert given signed interger data to FP4 type with E2M1
 * format.
 * Test source
 * ------------------------
 *  - /unit/deviceLib/fp4_ocp.cc
 * Test requirements
 * ------------------------
 *  - HIP_VERSION >= 6.5
 */
TEMPLATE_TEST_CASE("Unit_all_fp4_from_interger_data", "", int, long int, long long int, short int) {
  SECTION("Fp4 with e2m1") {
    std::vector<TestType> input{-1, 0, 1};
    for (const auto val : input) {
      __hip_fp4_e2m1 fp4(val);
      float ret = fp4;
      INFO("In: " << val);
      INFO("Out: " << ret);
      REQUIRE(ret == val);
    }
  }
}

/**
 * Test Description
 * ------------------------
 *  - Basic test to convert given unsigned integer data to FP4 type with E2M1
 * format.
 * Test source
 * ------------------------
 *  - /unit/deviceLib/fp4_ocp.cc
 * Test requirements
 * ------------------------
 *  - HIP_VERSION >= 6.5
 */
TEMPLATE_TEST_CASE("Unit_all_fp4_from__unsigned_integer_data", "", unsigned int, unsigned long int,
                   unsigned long long int, unsigned short int) {
  SECTION("Fp4 with e2m1") {
    std::vector<TestType> input{1, 2, 3};
    for (const auto val : input) {
      __hip_fp4_e2m1 fp4(val);
      float ret = fp4;
      INFO("In: " << val);
      INFO("Out: " << ret);
      REQUIRE(ret == val);
    }
  }
}

/**
 * Test Description
 * ------------------------
 *  - Basic test to convert given signed interger data to FP4 type in device with E2M1
 * format.
 * Test source
 * ------------------------
 *  - /unit/deviceLib/fp4_ocp.cc
 * Test requirements
 * ------------------------
 *  - HIP_VERSION >= 6.5
 */

TEMPLATE_TEST_CASE("Unit_all_fp4_from_integer_data_device", "", int, long int, long long int,
                   short int) {
  std::vector<float> all_fp4{-6.0f, -4.0f, -3.0f, -2.0f, -1.5f, -1.0f, -0.5f, 0.0f,
                             0.5f,  1.0f,  1.5f,  2.0f,  3.0f,  4.0f,  6.0f};
  auto fp4x1_l = [] __device__(TestType * inputs, float* outputs, size_t size) {
    int i = threadIdx.x;
    if (i < size) {
      __hip_fp4_e2m1 fp4(inputs[i]);
      outputs[i] = fp4;
    }
  };

  std::vector<TestType> inputs;
  inputs.reserve(30);
  for (int i = 0; i <= 6; i += 1) {
    inputs.push_back(i);
  }
  TestType* d_in;
  float* d_out;
  HIP_CHECK(hipMalloc(&d_in, sizeof(TestType) * inputs.size()));
  HIP_CHECK(hipMalloc(&d_out, sizeof(float) * inputs.size()));

  HIP_CHECK(
      hipMemcpy(d_in, inputs.data(), sizeof(TestType) * inputs.size(), hipMemcpyHostToDevice));
  lambda_kernel_launch<<<1, 32>>>(fp4x1_l, d_in, d_out, inputs.size());

  std::vector<float> outputs(inputs.size(), 0.0f);
  HIP_CHECK(hipMemcpy(outputs.data(), d_out, sizeof(float) * inputs.size(), hipMemcpyDeviceToHost));

  for (size_t i = 0; i < inputs.size(); i++) {
    auto lbound = std::lower_bound(all_fp4.begin(), all_fp4.end(), outputs[i]);
    INFO("Original: " << inputs[i] << " Output: " << *lbound);
    REQUIRE(*lbound == outputs[i]);
  }

  HIP_CHECK(hipFree(d_in));
  HIP_CHECK(hipFree(d_out));
}

/**
 * Test Description
 * ------------------------
 *  - Basic test to convert given unsigned interger data to FP4 type in device with E2M1
 * format.
 * Test source
 * ------------------------
 *  - /unit/deviceLib/fp4_ocp.cc
 * Test requirements
 * ------------------------
 *  - HIP_VERSION >= 6.5
 */
TEMPLATE_TEST_CASE("Unit_all_fp4_from__unsigned_integer_data_device", "", unsigned int,
                   unsigned long int, unsigned long long int, unsigned short int) {
  std::vector<float> all_fp4{-6.0f, -4.0f, -3.0f, -2.0f, -1.5f, -1.0f, -0.5f, 0.0f,
                             0.5f,  1.0f,  1.5f,  2.0f,  3.0f,  4.0f,  6.0f};
  auto fp4x1_l = [] __device__(TestType * inputs, float* outputs, size_t size) {
    int i = threadIdx.x;
    if (i < size) {
      __hip_fp4_e2m1 fp4(inputs[i]);
      outputs[i] = fp4;
    }
  };

  std::vector<TestType> inputs;
  inputs.reserve(30);
  for (int i = -6; i <= 6; i += 1) {
    inputs.push_back(i);
  }
  TestType* d_in;
  float* d_out;
  HIP_CHECK(hipMalloc(&d_in, sizeof(TestType) * inputs.size()));
  HIP_CHECK(hipMalloc(&d_out, sizeof(float) * inputs.size()));

  HIP_CHECK(
      hipMemcpy(d_in, inputs.data(), sizeof(TestType) * inputs.size(), hipMemcpyHostToDevice));
  lambda_kernel_launch<<<1, 32>>>(fp4x1_l, d_in, d_out, inputs.size());

  std::vector<float> outputs(inputs.size(), 0.0f);
  HIP_CHECK(hipMemcpy(outputs.data(), d_out, sizeof(float) * inputs.size(), hipMemcpyDeviceToHost));

  for (size_t i = 0; i < inputs.size(); i++) {
    auto lbound = std::lower_bound(all_fp4.begin(), all_fp4.end(), outputs[i]);
    INFO("Original: " << inputs[i] << " Output: " << *lbound);
    REQUIRE(*lbound == outputs[i]);
  }

  HIP_CHECK(hipFree(d_in));
  HIP_CHECK(hipFree(d_out));
}

/**
 * Test Description
 * ------------------------
 *  - Basic test to convert given double type data to FP4 type with E2M3 and
 * E3M2 formats.
 * Test source
 * ------------------------
 *  - /unit/deviceLib/fp4_ocp.cc
 * Test requirements
 * ------------------------
 *  - HIP_VERSION >= 6.5
 */
TEST_CASE("Unit_ocp_fp4_from_double_full_range_host") {
  std::vector<double> in;
  in.reserve(30);
  for (double i = -6.0; i <= 6.0; i += 0.5) {
    in.push_back(i);
  }

  std::vector<float> expected{-6.0f, -6.0f, -4.0f, -4.0f, -4.0f, -4.0f, -3.0f, -2.0f, -2.0f,
                              -1.5f, -1.0f, -0.5f, 0.0f,  0.5f,  1.0f,  1.5f,  2.0f,  2.0f,
                              3.0f,  4.0f,  4.0f,  4.0f,  4.0f,  6.0f,  6.0f};

  for (size_t i = 0; i < in.size(); i++) {
    __hip_fp4_e2m1 fp4(in[i]);
    float fp32 = fp4;
    INFO("Original: " << in[i] << " Output: " << fp32 << " Expected: " << expected[i]);
    REQUIRE(expected[i] == fp32);
  }
}

/**
 * Test Description
 * ------------------------
 *  - Basic test to convert given double type data to FP4 type in device with
 * E2M3 and E3M2 formats.
 * Test source
 * ------------------------
 *  - /unit/deviceLib/fp4_ocp.cc
 * Test requirements
 * ------------------------
 *  - HIP_VERSION >= 6.5
 */

TEST_CASE("Unit_ocp_fp4_from_double_full_range_device") {
  std::vector<float> all_fp4{-6.0f, -4.0f, -3.0f, -2.0f, -1.5f, -1.0f, -0.5f, 0.0f,
                             0.5f,  1.0f,  1.5f,  2.0f,  3.0f,  4.0f,  6.0f};
  auto fp4x1_l = [] __device__(double* inputs, float* outputs, size_t size) {
    int i = threadIdx.x;
    if (i < size) {
      __hip_fp4_e2m1 fp4(inputs[i]);
      outputs[i] = fp4;
    }
  };

  std::vector<double> inputs;
  inputs.reserve(30);
  for (double i = -6.0; i <= 6.0; i += 0.5) {
    inputs.push_back(i);
  }
  double* d_in;
  float* d_out;
  HIP_CHECK(hipMalloc(&d_in, sizeof(double) * inputs.size()));
  HIP_CHECK(hipMalloc(&d_out, sizeof(float) * inputs.size()));

  HIP_CHECK(hipMemcpy(d_in, inputs.data(), sizeof(double) * inputs.size(), hipMemcpyHostToDevice));
  lambda_kernel_launch<<<1, 32>>>(fp4x1_l, d_in, d_out, inputs.size());

  std::vector<float> outputs(inputs.size(), 0.0f);
  HIP_CHECK(hipMemcpy(outputs.data(), d_out, sizeof(float) * inputs.size(), hipMemcpyDeviceToHost));

  for (size_t i = 0; i < inputs.size(); i++) {
    auto lbound = std::lower_bound(all_fp4.begin(), all_fp4.end(), outputs[i]);
    INFO("Original: " << inputs[i] << " Output: " << *lbound);
    REQUIRE(*lbound == outputs[i]);
  }

  HIP_CHECK(hipFree(d_in));
  HIP_CHECK(hipFree(d_out));
}