/******************************************************************************
Copyright (c) 2018 Advanced Micro Devices, Inc. All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*******************************************************************************/

#include <hsa.h>
#include <string.h>
#include <unistd.h>
#include <dlfcn.h>

#include <atomic>
#include <iostream>
#include <sstream>
#include <vector>

#include "inc/rocprofiler.h"
#include "util/hsa_rsrc_factory.h"

#define PUBLIC_API __attribute__((visibility("default")))
#define CONSTRUCTOR_API __attribute__((constructor))
#define DESTRUCTOR_API __attribute__((destructor))

// Dispatch callbacks and context handlers synchronization
pthread_mutex_t mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
// Tool is unloaded
volatile bool is_loaded = false;
// Profiling features
//rocprofiler_feature_t* features = NULL;
//unsigned feature_count = 0;

// Error handler
void fatal(const std::string msg) {
  fflush(stdout);
  fprintf(stderr, "%s\n\n", msg.c_str());
  fflush(stderr);
  abort();
}

// Check returned HSA API status
void check_status(hsa_status_t status) {
  if (status != HSA_STATUS_SUCCESS) {
    const char* error_string = NULL;
    rocprofiler_error_string(&error_string);
    fprintf(stderr, "ERROR: %s\n", error_string);
    abort();
  }
}

// Context stored entry type
struct context_entry_t {
  bool valid;
  hsa_agent_t agent;
  rocprofiler_group_t group;
  rocprofiler_callback_data_t data;
};

// Context callback arg
struct callbacks_arg_t {
  rocprofiler_pool_t** pools;
};

// Handler callback arg
struct handler_arg_t {
  rocprofiler_feature_t* features;
  unsigned feature_count;
};

// Dump stored context entry
void dump_context_entry(context_entry_t* entry, rocprofiler_feature_t* features, unsigned feature_count) {
  volatile std::atomic<bool>* valid = reinterpret_cast<std::atomic<bool>*>(&entry->valid);
  while (valid->load() == false) sched_yield();

  const std::string kernel_name = entry->data.kernel_name;
  const rocprofiler_dispatch_record_t* record = entry->data.record;

  fflush(stdout);
  fprintf(stdout, "kernel symbol(0x%lx) name(\"%s\") tid(%u) queue-id(%u) gpu-id(%u) ",
    entry->data.kernel_object,
    kernel_name.c_str(),
    entry->data.thread_id,
    entry->data.queue_id,
    HsaRsrcFactory::Instance().GetAgentInfo(entry->agent)->dev_index);
  if (record) fprintf(stdout, "time(%lu,%lu,%lu,%lu)",
    record->dispatch,
    record->begin,
    record->end,
    record->complete);
  fprintf(stdout, "\n");
  fflush(stdout);

  rocprofiler_group_t& group = entry->group;
  if (group.context == NULL) {
    fatal("context is NULL\n");
  }
  if (feature_count > 0) {
    hsa_status_t status = rocprofiler_group_get_data(&group);
    check_status(status);
    status = rocprofiler_get_metrics(group.context);
    check_status(status);
  }

  for (unsigned i = 0; i < feature_count; ++i) {
    const rocprofiler_feature_t* p = &features[i];
    fprintf(stdout, ">  %s ", p->name);
    switch (p->data.kind) {
      // Output metrics results
      case ROCPROFILER_DATA_KIND_INT64:
        fprintf(stdout, "= (%lu)\n", p->data.result_int64);
        break;
      default:
        fprintf(stderr, "Undefined data kind(%u)\n", p->data.kind);
        abort();
    }
  }
}

// Profiling completion handler
// Dump and delete the context entry
// Return true if the context was dumped successfully
bool context_handler(const rocprofiler_pool_entry_t* entry, void* arg) {
  // Context entry
  context_entry_t* ctx_entry = reinterpret_cast<context_entry_t*>(entry->payload);
  handler_arg_t* handler_arg = reinterpret_cast<handler_arg_t*>(arg);

  if (pthread_mutex_lock(&mutex) != 0) {
    perror("pthread_mutex_lock");
    abort();
  }

  dump_context_entry(ctx_entry, handler_arg->features, handler_arg->feature_count);

  if (pthread_mutex_unlock(&mutex) != 0) {
    perror("pthread_mutex_unlock");
    abort();
  }

  return false;
}
#if 0
// Profiling completion handler
// Dump and delete the context entry
// Return true if the context was dumped successfully
bool context_handler1(rocprofiler_group_t group, void* arg) {
  context_entry_t* ctx_entry = reinterpret_cast<context_entry_t*>(arg);

  if (pthread_mutex_lock(&mutex) != 0) {
    perror("pthread_mutex_lock");
    abort();
  }

  dump_context_entry(ctx_entry, features, feature_count);

  if (pthread_mutex_unlock(&mutex) != 0) {
    perror("pthread_mutex_unlock");
    abort();
  }

  return false;
}
#endif
// Kernel disoatch callback
hsa_status_t dispatch_callback(const rocprofiler_callback_data_t* callback_data, void* arg,
                               rocprofiler_group_t* group) {
  // Passed tool data
  hsa_agent_t agent = callback_data->agent;
  // HSA status
  hsa_status_t status = HSA_STATUS_ERROR;

#if 1
  // Open profiling context
  const unsigned gpu_id = HsaRsrcFactory::Instance().GetAgentInfo(agent)->dev_index;
  callbacks_arg_t* callbacks_arg = reinterpret_cast<callbacks_arg_t*>(arg);
  rocprofiler_pool_t* pool = callbacks_arg->pools[gpu_id];
  rocprofiler_pool_entry_t pool_entry{};
  status = rocprofiler_pool_fetch(pool, &pool_entry);
  check_status(status);
  // Profiling context entry
  rocprofiler_t* context = pool_entry.context;
  context_entry_t* entry = reinterpret_cast<context_entry_t*>(pool_entry.payload);
#else
  // Open profiling context
  // context properties
  context_entry_t* entry = new context_entry_t{};
  rocprofiler_t* context = NULL;
  rocprofiler_properties_t properties{};
  properties.handler = context_handler1;
  properties.handler_arg = (void*)entry;
  status = rocprofiler_open(agent, features, feature_count,
                            &context, 0 /*ROCPROFILER_MODE_SINGLEGROUP*/, &properties);
  check_status(status);
#endif
  // Get group[0]
  status = rocprofiler_get_group(context, 0, group);
  check_status(status);

  // Fill profiling context entry
  entry->agent = agent;
  entry->group = *group;
  entry->data = *callback_data;
  entry->data.kernel_name = strdup(callback_data->kernel_name);
  reinterpret_cast<std::atomic<bool>*>(&entry->valid)->store(true);

  return HSA_STATUS_SUCCESS;
}

unsigned metrics_input(rocprofiler_feature_t** ret) {
  // Profiling feature objects
  const unsigned feature_count = 6;
  rocprofiler_feature_t* features = new rocprofiler_feature_t[feature_count];
  memset(features, 0, feature_count * sizeof(rocprofiler_feature_t));

  // PMC events
  features[0].kind = ROCPROFILER_FEATURE_KIND_METRIC;
  features[0].name = "GRBM_COUNT";
  features[1].kind = ROCPROFILER_FEATURE_KIND_METRIC;
  features[1].name = "GRBM_GUI_ACTIVE";
  features[2].kind = ROCPROFILER_FEATURE_KIND_METRIC;
  features[2].name = "GPUBusy";
  features[3].kind = ROCPROFILER_FEATURE_KIND_METRIC;
  features[3].name = "SQ_WAVES";
  features[4].kind = ROCPROFILER_FEATURE_KIND_METRIC;
  features[4].name = "SQ_INSTS_VALU";
  features[5].kind = ROCPROFILER_FEATURE_KIND_METRIC;
  features[5].name = "VALUInsts";
//  features[6].kind = ROCPROFILER_FEATURE_KIND_METRIC;
//  features[6].name = "TCC_HIT_sum";
//  features[7].kind = ROCPROFILER_FEATURE_KIND_METRIC;
//  features[7].name = "TCC_MISS_sum";
//  features[8].kind = ROCPROFILER_FEATURE_KIND_METRIC;
//  features[8].name = "WRITE_SIZE";

  *ret = features;
  return feature_count;
}

void initialize() {
  // Available GPU agents
  const unsigned gpu_count = HsaRsrcFactory::Instance().GetCountOfGpuAgents();

  // Getting profiling features
  rocprofiler_feature_t* features = NULL;
  unsigned feature_count = metrics_input(&features);

  // Handler arg
  handler_arg_t* handler_arg = new handler_arg_t{};
  handler_arg->features = features;
  handler_arg->feature_count = feature_count;

  // Context properties
  rocprofiler_pool_properties_t properties{};
  properties.num_entries = 100;
  properties.payload_bytes = sizeof(context_entry_t);
  properties.handler = context_handler;
  properties.handler_arg = handler_arg;

  // Adding dispatch observer
  callbacks_arg_t* callbacks_arg = new callbacks_arg_t{};
  callbacks_arg->pools = new rocprofiler_pool_t* [gpu_count];
  for (unsigned gpu_id = 0; gpu_id < gpu_count; gpu_id++) {
    // Getting GPU device info
    const AgentInfo* agent_info = NULL;
    if (HsaRsrcFactory::Instance().GetGpuAgentInfo(gpu_id, &agent_info) == false) {
      fprintf(stderr, "GetGpuAgentInfo failed\n");
      abort();
    }

    // Open profiling pool
    rocprofiler_pool_t* pool = NULL;
    hsa_status_t status = rocprofiler_pool_open(agent_info->dev_id, features, feature_count,
                                                &pool, 0/*ROCPROFILER_MODE_SINGLEGROUP*/, &properties);
    check_status(status);
    callbacks_arg->pools[gpu_id] = pool;
  }

  rocprofiler_queue_callbacks_t callbacks_ptrs{};
  callbacks_ptrs.dispatch = dispatch_callback;
  rocprofiler_set_queue_callbacks(callbacks_ptrs, callbacks_arg);
}

void cleanup() {
  // Unregister dispatch callback
  rocprofiler_remove_queue_callbacks();
  // CLose profiling pool
#if 0
  hsa_status_t status = rocprofiler_pool_flush(pool);
  check_status(status);
  status = rocprofiler_pool_close(pool);
  check_status(status);
#endif
}

// Tool constructor
extern "C" PUBLIC_API void OnLoadToolProp(rocprofiler_settings_t* settings)
{
  if (pthread_mutex_lock(&mutex) != 0) {
    perror("pthread_mutex_lock");
    abort();
  }
  if (is_loaded) return;
  is_loaded = true;
  if (pthread_mutex_unlock(&mutex) != 0) {
    perror("pthread_mutex_unlock");
    abort();
  }

  // Enable timestamping
  settings->timestamp_on = true;

  // Initialize profiling
  initialize();
}

// Tool destructor
extern "C" PUBLIC_API void OnUnloadTool() {
  if (pthread_mutex_lock(&mutex) != 0) {
    perror("pthread_mutex_lock");
    abort();
  }
  if (!is_loaded) return;
  is_loaded = false;
  if (pthread_mutex_unlock(&mutex) != 0) {
    perror("pthread_mutex_unlock");
    abort();
  }

  // Final resources cleanup
  cleanup();
}

extern "C" CONSTRUCTOR_API void constructor() {
  printf("INTT constructor\n"); fflush(stdout);
}

extern "C" DESTRUCTOR_API void destructor() {
  if (is_loaded == true) OnUnloadTool();
}