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/**
Testcase Scenarios
------------------
Functional ::
 1) Add nodes to graph with and without dependencies, verify the api returns list of
 root nodes (i.e., nodes without dependencies).
 2) Pass nodes as nullptr and verify api returns actual number of root nodes added to graph.
 3) If NumRootNodes passed is greater than the actual number of root nodes, the remaining entries in
 nodes list will be set to NULL, and the number of nodes actually obtained will be returned in NumRootNodes.

Argument Validation ::
 1) Pass graph as nullptr and verify api returns error code.
 2) Pass numRootNodes as nullptr and other params as valid values. Expect api to return error code.
 3) When there are no nodes in graph, expect numRootNodes to be set to zero.
 4) Pass numRootNodes less than actual number of nodes. Expect api to populate requested number of node entries
 and does update numRootNodes.
*/

#include <hip_test_common.hh>
#include <hip_test_checkers.hh>
#include <hip_test_kernels.hh>

/**
 * Functional Test for API fetching root node list
 */
TEST_CASE("Unit_hipGraphGetRootNodes_Functional") {
  constexpr size_t N = 1024;
  constexpr size_t Nbytes = N * sizeof(int);
  constexpr auto blocksPerCU = 6;  // to hide latency
  constexpr auto threadsPerBlock = 256;
  constexpr auto addlEntries = 5;
  hipGraph_t graph;

  hipGraphNode_t memcpyNode, kernelNode;
  hipKernelNodeParams kernelNodeParams{};
  hipStream_t streamForGraph;
  int *A_d, *B_d, *C_d;
  int *A_h, *B_h, *C_h;
  std::vector<hipGraphNode_t> dependencies, rootnodelist;
  hipGraphExec_t graphExec;
  size_t NElem{N};

  HIP_CHECK(hipStreamCreate(&streamForGraph));
  HipTest::initArrays(&A_d, &B_d, &C_d, &A_h, &B_h, &C_h, N, false);
  unsigned blocks = HipTest::setNumBlocks(blocksPerCU, threadsPerBlock, N);

  HIP_CHECK(hipGraphCreate(&graph, 0));
  HIP_CHECK(hipGraphAddMemcpyNode1D(&memcpyNode, graph, NULL, 0, A_d, A_h,
                                   Nbytes, hipMemcpyHostToDevice));
  dependencies.push_back(memcpyNode);
  rootnodelist.push_back(memcpyNode);
  HIP_CHECK(hipGraphAddMemcpyNode1D(&memcpyNode, graph, NULL, 0, B_d, B_h,
                                   Nbytes, hipMemcpyHostToDevice));
  dependencies.push_back(memcpyNode);
  rootnodelist.push_back(memcpyNode);

  void* kernelArgs[] = {&A_d, &B_d, &C_d, reinterpret_cast<void *>(&NElem)};
  kernelNodeParams.func = reinterpret_cast<void *>(HipTest::vectorADD<int>);
  kernelNodeParams.gridDim = dim3(blocks);
  kernelNodeParams.blockDim = dim3(threadsPerBlock);
  kernelNodeParams.sharedMemBytes = 0;
  kernelNodeParams.kernelParams = reinterpret_cast<void**>(kernelArgs);
  kernelNodeParams.extra = nullptr;
  HIP_CHECK(hipGraphAddKernelNode(&kernelNode, graph, dependencies.data(),
                                  dependencies.size(), &kernelNodeParams));
  dependencies.clear();
  dependencies.push_back(kernelNode);
  HIP_CHECK(hipGraphAddMemcpyNode1D(&memcpyNode, graph, dependencies.data(),
                                    dependencies.size(), C_h, C_d,
                                    Nbytes, hipMemcpyDeviceToHost));

  // Get numRootNodes by passing rootnodes list as nullptr.
  // verify : numRootNodes is set to actual number of root nodes added
  size_t numRootNodes{};
  HIP_CHECK(hipGraphGetRootNodes(graph, nullptr, &numRootNodes));
  INFO("Num of nodes returned by GetRootNodes : " << numRootNodes);
  REQUIRE(numRootNodes == rootnodelist.size());

  // Request for extra/additional nodes.
  // verify : totNodes is reset to actual number of root nodes present
  // verify : additional entries in rootnodes list are set to nullptr
  size_t totNodes = numRootNodes + addlEntries;
  int numBytes = sizeof(hipGraphNode_t) * totNodes;
  hipGraphNode_t* rootnodes =
                 reinterpret_cast<hipGraphNode_t *>(malloc(numBytes));
  REQUIRE(rootnodes != nullptr);
  HIP_CHECK(hipGraphGetRootNodes(graph, rootnodes, &totNodes));
  REQUIRE(totNodes == rootnodelist.size());
  for (auto i = numRootNodes; i < numRootNodes + addlEntries; i++) {
    REQUIRE(rootnodes[i] == nullptr);
  }

  // Verify added nodes(without dependencies) are present
  // in the root nodes fetched.
  for (auto Node : rootnodelist) {
    bool found = false;
    for (size_t i = 0; i < numRootNodes; i++) {
      if (Node == rootnodes[i]) {
        found = true;
        break;
      }
    }

    if (!found) {
      INFO("Returned root node " << Node << " not present in added list");
      REQUIRE(false);
    }
  }

  // Instantiate and launch the graph
  HIP_CHECK(hipGraphInstantiate(&graphExec, graph, NULL, NULL, 0));
  HIP_CHECK(hipGraphLaunch(graphExec, streamForGraph));
  HIP_CHECK(hipStreamSynchronize(streamForGraph));

  // Verify graph execution result
  HipTest::checkVectorADD(A_h, B_h, C_h, N);

  HipTest::freeArrays(A_d, B_d, C_d, A_h, B_h, C_h, false);
  HIP_CHECK(hipGraphExecDestroy(graphExec));
  HIP_CHECK(hipGraphDestroy(graph));
  HIP_CHECK(hipStreamDestroy(streamForGraph));
  free(rootnodes);
}

/**
 * Test performs api parameter validation by passing various values
 * as input and output parameters and validates the behavior.
 * Test will include both negative and positive scenarios.
 */
TEST_CASE("Unit_hipGraphGetRootNodes_ParamValidation") {
  hipStream_t stream1{nullptr}, stream2{nullptr}, mstream{nullptr};
  hipEvent_t memsetEvent1, memsetEvent2, forkStreamEvent;
  hipGraph_t graph{nullptr};
  constexpr unsigned blocks = 512;
  constexpr unsigned threadsPerBlock = 256;
  constexpr size_t N = 1000000;
  size_t Nbytes = N * sizeof(float), numRootNodes{};
  float *A_d, *C_d;
  float *A_h, *C_h;
  A_h = reinterpret_cast<float*>(malloc(Nbytes));
  C_h = reinterpret_cast<float*>(malloc(Nbytes));
  REQUIRE(A_h != nullptr);
  REQUIRE(C_h != nullptr);
  HIP_CHECK(hipMalloc(&A_d, Nbytes));
  HIP_CHECK(hipMalloc(&C_d, Nbytes));
  REQUIRE(A_d != nullptr);
  REQUIRE(C_d != nullptr);

  HIP_CHECK(hipStreamCreate(&stream1));
  HIP_CHECK(hipStreamCreate(&stream2));
  HIP_CHECK(hipStreamCreate(&mstream));
  HIP_CHECK(hipEventCreate(&memsetEvent1));
  HIP_CHECK(hipEventCreate(&memsetEvent2));
  HIP_CHECK(hipEventCreate(&forkStreamEvent));
  HIP_CHECK(hipStreamBeginCapture(mstream, hipStreamCaptureModeGlobal));
  HIP_CHECK(hipEventRecord(forkStreamEvent, mstream));
  HIP_CHECK(hipStreamWaitEvent(stream1, forkStreamEvent, 0));
  HIP_CHECK(hipStreamWaitEvent(stream2, forkStreamEvent, 0));
  HIP_CHECK(hipMemsetAsync(A_d, 0, Nbytes, stream1));
  HIP_CHECK(hipEventRecord(memsetEvent1, stream1));
  HIP_CHECK(hipMemsetAsync(C_d, 0, Nbytes, stream2));
  HIP_CHECK(hipEventRecord(memsetEvent2, stream2));
  HIP_CHECK(hipStreamWaitEvent(mstream, memsetEvent1, 0));
  HIP_CHECK(hipStreamWaitEvent(mstream, memsetEvent2, 0));
  HIP_CHECK(hipMemcpyAsync(A_d, A_h, Nbytes, hipMemcpyHostToDevice, mstream));
  hipLaunchKernelGGL(HipTest::vector_square, dim3(blocks),
                              dim3(threadsPerBlock), 0, mstream, A_d, C_d, N);
  HIP_CHECK(hipMemcpyAsync(C_h, C_d, Nbytes, hipMemcpyDeviceToHost, mstream));
  HIP_CHECK(hipStreamEndCapture(mstream, &graph));
  HIP_CHECK(hipGraphGetRootNodes(graph, nullptr, &numRootNodes));
  INFO("Num of nodes returned by GetRootNodes : " << numRootNodes);
  int numBytes = sizeof(hipGraphNode_t) * numRootNodes;
  hipGraphNode_t* nodes = reinterpret_cast<hipGraphNode_t *>(malloc(numBytes));
  REQUIRE(nodes != nullptr);

  SECTION("graph as nullptr") {
    hipError_t ret = hipGraphGetRootNodes(nullptr, nodes, &numRootNodes);
    REQUIRE(ret == hipErrorInvalidValue);
  }

  SECTION("numRootNodes as nullptr") {
    hipError_t ret = hipGraphGetRootNodes(graph, nodes, nullptr);
    REQUIRE(ret == hipErrorInvalidValue);
  }

  SECTION("no nodes in graph") {
    hipGraph_t emptyGraph{};
    HIP_CHECK(hipGraphCreate(&emptyGraph, 0));
    HIP_CHECK(hipGraphGetRootNodes(emptyGraph, nullptr, &numRootNodes));
    REQUIRE(numRootNodes == 0);
  }

  SECTION("numRootNodes less than actual number of nodes") {
    size_t numPartNodes = numRootNodes - 1;
    hipGraphNodeType nodeType;
    HIP_CHECK(hipGraphGetRootNodes(graph, nodes, &numPartNodes));

    // verify numPartNodes is unchanged
    REQUIRE(numPartNodes == numRootNodes - 1);
    // verify partial node list returned has valid nodes
    for (size_t i = 0; i < numPartNodes; i++) {
      HIP_CHECK(hipGraphNodeGetType(nodes[i], &nodeType));
      REQUIRE(nodeType >= 0);
      REQUIRE(nodeType < hipGraphNodeTypeCount);
    }
  }

  HIP_CHECK(hipGraphDestroy(graph));
  HIP_CHECK(hipStreamDestroy(mstream));
  HIP_CHECK(hipStreamDestroy(stream1));
  HIP_CHECK(hipStreamDestroy(stream2));
  HIP_CHECK(hipEventDestroy(forkStreamEvent));
  HIP_CHECK(hipEventDestroy(memsetEvent1));
  HIP_CHECK(hipEventDestroy(memsetEvent2));
  free(A_h);
  free(C_h);
  free(nodes);
  HIP_CHECK(hipFree(A_d));
  HIP_CHECK(hipFree(C_d));
}