#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <stdint.h>
#include <mpi.h>

#include "tapioca.hpp"

#define RED     "\x1b[31m"
#define GREEN   "\x1b[32m"
#define BLUE    "\x1b[34m"
#define RESET   "\x1b[0m"

int main (int argc, char * argv[])
{
  int world_numtasks, world_myrank, mycolor, mykey, sub_numtasks, sub_myrank, file_id;
  int64_t num_particles;
  int64_t sub_particles, tot_particles, particle_size, file_size, tot_size;
  int64_t scan_size = 0, offset;
  double start_time, end_time, tot_time, max_time;
  double io_bw;
  MPI_Comm sub_comm;
  MPI_File file_handle;
  MPI_Status status;
  char output[100];
  Tapioca tp;
  
  MPI_Init(&argc, &argv);
  MPI_Comm_size(MPI_COMM_WORLD, &world_numtasks);
  MPI_Comm_rank(MPI_COMM_WORLD, &world_myrank);

  mycolor = tp.topology.BridgeNodeId ();
  mykey = world_myrank;

  MPI_Comm_split (MPI_COMM_WORLD, mycolor, mykey, &sub_comm);
  MPI_Comm_size(sub_comm, &sub_numtasks);
  MPI_Comm_rank(sub_comm, &sub_myrank);

  num_particles = atoi ( argv[1] );

  file_id = 0;
  if ( argv[2] != NULL )
    file_id = atoi ( argv[2] );
       
#ifdef BGQ
       snprintf (output, 100, "/projects/visualization/ftessier/debug/HACC-SOA-%08d-%d.dat", mycolor, file_id);
#elif XC40
       snprintf (output, 100, "/lus/theta-fs0/projects/Performance/ftessier/HACC/HACC-AOS-%08d-%d.dat", mycolor, file_id);
#else
       snprintf (output, 100, "./HACC-SOA-%08d-%d.dat", mycolor, file_id);
#endif
       

  /*****************/
  /*     WRITE     */
  /*****************/
  float *xx, *yy, *zz, *vx, *vy, *vz, *phi;
  int64_t* pid;
  uint16_t* mask;

  xx = new float[num_particles];
  yy = new float[num_particles];
  zz = new float[num_particles];
  vx = new float[num_particles];
  vy = new float[num_particles];
  vz = new float[num_particles];
  phi = new float[num_particles];
  pid = new int64_t[num_particles];
  mask = new uint16_t[num_particles];

  for (uint64_t i = 0; i< num_particles; i++)
    {
      xx[i] = (float)i;
      yy[i] = (float)i;
      zz[i] = (float)i;
      vx[i] = (float)i;
      vy[i] = (float)i;
      vz[i] = (float)i;
      phi[i] = (float)i;
      pid[i] =  (int64_t)i;
      mask[i] = (uint16_t)world_myrank;
    }

  MPI_Allreduce(&num_particles, &sub_particles, 1, MPI_LONG_LONG, MPI_SUM, sub_comm);
  MPI_Allreduce(&num_particles, &tot_particles, 1, MPI_LONG_LONG, MPI_SUM, MPI_COMM_WORLD);
  
  particle_size = (7 * sizeof(float)) + sizeof(int64_t) + sizeof(uint16_t);
  file_size = particle_size * sub_particles;
  tot_size = particle_size * tot_particles;

  if (sub_myrank == 0) {
    MPI_File_open(MPI_COMM_SELF, output,
		  MPI_MODE_WRONLY | MPI_MODE_CREATE, MPI_INFO_NULL, &file_handle);
    MPI_File_set_size(file_handle, file_size);
    MPI_File_close (&file_handle);
  }

  MPI_Exscan (&num_particles, &scan_size, 1, MPI_LONG_LONG, MPI_SUM, sub_comm);
    
  if (0 == sub_myrank) {
    fprintf (stdout, GREEN "[INFO]" RESET " [%08d] miniHACC-AoS-MPIIO\n", mycolor);
    fprintf (stdout, GREEN "[INFO]" RESET " [%08d] Write output file (AoS data layout)\n", mycolor);
    fprintf (stdout, GREEN "[INFO]" RESET " [%08d] --> %lld particles per rank\n", mycolor, num_particles);
    fprintf (stdout, GREEN "[INFO]" RESET " [%08d] --> File size: %.2f MB (%lld particles)\n", 
	     mycolor, (double)file_size/(1024*1024), sub_particles);
  }

  start_time = MPI_Wtime();

  MPI_File_open(sub_comm, output,
		MPI_MODE_WRONLY, MPI_INFO_NULL, &file_handle);
  
  offset = scan_size * particle_size;

  MPI_File_write_at_all (file_handle, offset, xx, num_particles, MPI_FLOAT, &status);
  offset += num_particles * sizeof(float);

  MPI_File_write_at_all (file_handle, offset, yy, num_particles, MPI_FLOAT, &status);
  offset += num_particles * sizeof(float);

  MPI_File_write_at_all (file_handle, offset, zz, num_particles, MPI_FLOAT, &status);
  offset += num_particles * sizeof(float);

  MPI_File_write_at_all (file_handle, offset, vx, num_particles, MPI_FLOAT, &status);
  offset += num_particles * sizeof(float);

  MPI_File_write_at_all (file_handle, offset, vy, num_particles, MPI_FLOAT, &status);
  offset += num_particles * sizeof(float);

  MPI_File_write_at_all (file_handle, offset, vz, num_particles, MPI_FLOAT, &status);
  offset += num_particles * sizeof(float);

  MPI_File_write_at_all (file_handle, offset, phi, num_particles, MPI_FLOAT, &status);
  offset += num_particles * sizeof(float);

  MPI_File_write_at_all (file_handle, offset, pid, num_particles, MPI_LONG_LONG, &status);
  offset += num_particles * sizeof(int64_t);

  MPI_File_write_at_all (file_handle, offset, mask, num_particles, MPI_UNSIGNED_SHORT, &status);
  
  MPI_File_close (&file_handle);

  end_time = MPI_Wtime();
  tot_time = end_time - start_time;
  MPI_Reduce (&tot_time, &max_time, 1, MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
  
  if (0 == world_myrank) {
    io_bw = (double)tot_size / max_time / (1024 * 1024);
    fprintf (stdout, BLUE "[TIMING]" RESET " Write I/O bandwidth: %.2f MBps (%.2f MB in %.2f ms)\n",
	     io_bw, (double)tot_size/(1024*1024), max_time * 1000);
  }

  MPI_Barrier (MPI_COMM_WORLD);

  /*****************/
  /*     READ      */
  /*****************/
  float *xx_r, *yy_r, *zz_r, *vx_r, *vy_r, *vz_r, *phi_r;
  int64_t* pid_r;
  uint16_t* mask_r;

  xx_r = new float[num_particles];
  yy_r = new float[num_particles];
  zz_r = new float[num_particles];
  vx_r = new float[num_particles];
  vy_r = new float[num_particles];
  vz_r = new float[num_particles];
  phi_r = new float[num_particles];
  pid_r = new int64_t[num_particles];
  mask_r = new uint16_t[num_particles];

  start_time = MPI_Wtime();

  MPI_File_open(sub_comm, output,
		MPI_MODE_RDONLY, MPI_INFO_NULL, &file_handle);

  if (0 == sub_myrank)
    fprintf (stdout, GREEN "[INFO]" RESET " [%08d] Read output file\n", mycolor);

  offset = scan_size * particle_size;

  MPI_File_read_at_all (file_handle, offset, xx_r, num_particles, MPI_FLOAT, &status);
  offset += num_particles * sizeof(float);

  MPI_File_read_at_all (file_handle, offset, yy_r, num_particles, MPI_FLOAT, &status);
  offset += num_particles * sizeof(float);

  MPI_File_read_at_all (file_handle, offset, zz_r, num_particles, MPI_FLOAT, &status);
  offset += num_particles * sizeof(float);

  MPI_File_read_at_all (file_handle, offset, vx_r, num_particles, MPI_FLOAT, &status);
  offset += num_particles * sizeof(float);

  MPI_File_read_at_all (file_handle, offset, vy_r, num_particles, MPI_FLOAT, &status);
  offset += num_particles * sizeof(float);

  MPI_File_read_at_all (file_handle, offset, vz_r, num_particles, MPI_FLOAT, &status);
  offset += num_particles * sizeof(float);

  MPI_File_read_at_all (file_handle, offset, phi_r, num_particles, MPI_FLOAT, &status);
  offset += num_particles * sizeof(float);

  MPI_File_read_at_all (file_handle, offset, pid_r, num_particles, MPI_LONG_LONG, &status);
  offset += num_particles * sizeof(int64_t);

  MPI_File_read_at_all (file_handle, offset, mask_r, num_particles, MPI_UNSIGNED_SHORT, &status);
  
  MPI_File_close (&file_handle);

  end_time = MPI_Wtime();
  tot_time = end_time - start_time;
  MPI_Reduce (&tot_time, &max_time, 1, MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
  
  if (0 == world_myrank) {
    io_bw = (double)tot_size / max_time / (1024 * 1024);
    fprintf (stdout, BLUE "[TIMING]" RESET " Read I/O bandwidth: %.2f MBps (%.2f MB in %.2f ms)\n",
	     io_bw, (double)tot_size/(1024*1024), max_time * 1000);
  }

  /*****************/
  /* VERIFICATION  */
  /*****************/
  for (uint64_t i = 0; i< num_particles; i++) {
    if ((xx[i] != xx_r[i]) || (yy[i] != yy_r[i]) || (zz[i] != zz_r[i])
	|| (vx[i] != vx_r[i]) || (vy[i] != vy_r[i]) || (vz[i] != vz_r[i])
	|| (phi[i] != phi_r[i])|| (pid[i] != pid_r[i]) || (mask[i] != mask_r[i]))
      {
	fprintf (stdout, RED "[ERROR]" RESET " Wrong value for particle %d\n", i);
	MPI_Abort (MPI_COMM_WORLD, -1);
      }
  }

  if (0 == sub_myrank)
    fprintf (stdout, GREEN "[INFO]" RESET " [%08d] Content verified and consistent\n", mycolor);

  /*****************/
  /*      FREE     */
  /*****************/
  delete [] xx;
  delete [] xx_r;
  delete [] yy;
  delete [] yy_r;
  delete [] zz;
  delete [] zz_r;
  delete [] vx;
  delete [] vx_r;
  delete [] vy;
  delete [] vy_r;
  delete [] vz;
  delete [] vz_r;
  delete [] phi;
  delete [] phi_r;
  delete [] pid;
  delete [] pid_r;
  delete [] mask;
  delete [] mask_r;
  
  MPI_Finalize ();
}