/*************************************************************************
 * Copyright (c) 2025 Advanced Micro Devices, Inc. All rights reserved.
 *
 * See LICENSE.txt for license information
 ************************************************************************/

#include <gtest/gtest.h>
#include <rccl/rccl.h>

#include "RcclMockFuncs.hpp"
#include "comm.h"
#include "common/ProcessIsolatedTestRunner.hpp"

#include <fstream>
#include <thread>

#define HIPCALL(cmd)                                                                          \
    do {                                                                                      \
        hipError_t error = (cmd);                                                             \
        GTEST_ASSERT_EQ(error, hipSuccess);                                                   \
    } while (0)

namespace RcclUnitTesting
{
  /**
   * \brief Verify correctness of Recorder record() correctness in binary mode
   * ******************************************************************************************/
  TEST(Recorder, ParseBinary)
  {
    // to add after binary export of logging is supported
  }

  /**
   * \brief Verify correctness of Recorder record() correctness in json mode
   * ******************************************************************************************/
  TEST(Recorder, ParseJson)
  {
    RUN_ISOLATED_TEST_WITH_ENV(
      "ParseJson",
      []()
      {
        int pid = getpid();
        hipStream_t stream;
        HIPCALL(hipStreamCreate(&stream));

        int array[] = {2, 3, 5};
        ncclComm comm{.nRanks = 1, .localRank = 1, .localRankToRank = array, .opCount = 8, .planner = {.nTasksColl = 13, .nTasksP2p = 21}};
        rccl::rcclApiCall call(rccl::rrAllToAllv, {.sendbuff = (void*)0x7f22f9600000, .recvbuff = (void*)0x7f22f9601000, .count = 0, .datatype = ncclFloat32, .comm = &comm, .stream = stream});
        rccl::Recorder::instance().record(call);

        std::vector<rccl::rcclApiCall> calls;
        char entry[4096];
        gethostname(entry, 256);
        // Parse the output file written by the Recorder
        std::string filename = "/tmp/test." + std::to_string(pid) + "." + std::string(entry) + ".json";
        std::ifstream fp(filename);
        ASSERT_TRUE(fp.is_open()) << "Recorder did not create expected file: " << filename;
        fp.getline(entry, 4096); // line 1: "{"
        fp.getline(entry, 4096); // line 2: "  version : 1,"
        fp.getline(entry, 4096); // line 3: the serialised API call
        parseJsonEntry(entry, calls);
        ASSERT_FALSE(calls.empty()) << "parseJsonEntry produced no results; raw line: " << entry;
        // Compare all fields after pid (pid is the child's pid, not the outer test's)
        int result = memcmp(&(calls[0].pid)+1, &(call.pid)+1, sizeof(rccl::rcclApiCall)-sizeof(call.pid));
        fp.close();
        EXPECT_EQ(result, 0) << "Round-tripped rcclApiCall fields do not match";
      },
      {{"RCCL_REPLAY_FILE", "/tmp/test.json"}}
    );
  }

  /**
   * \brief Verify RCCL Recorder's integrity in multithread context by comparing Recorder
   * instance across different threads.
   * ******************************************************************************************/
  static void recorderCmp(void** recorder)
  {
    *recorder = &(rccl::Recorder::instance());
  }
  TEST(Recorder, VerifyMultithread)
  {
    void *p1, *p2;
    std::thread t1(recorderCmp, &p1);
    std::thread t2(recorderCmp, &p2);
    t1.join();
    t2.join();
    assert(p1 == p2);
  }
}