#define _POSIX_C_SOURCE 199309L

#include <stdio.h>
#include <stdlib.h>

#include "common.h"

double monotonic_seconds() {
  struct timespec ts;
  clock_gettime(CLOCK_MONOTONIC, &ts);
  return ts.tv_sec + ts.tv_nsec * 1e-9;
}

/**
 * @brief Output the seconds elapsed while execution.
 *
 * @param seconds Seconds spent on execution, excluding IO.
 */
void print_time(double const seconds) {
  printf("Execution time: %0.04fs\n", seconds);
}

struct data *read_data(char *path) {
  struct data *result = malloc(sizeof(struct data));

  // Open file
  FILE *file;
  {
    file = fopen(path, "r");
    if (!file)
      perror("failed to open file");

    if (!fscanf(file, "%u", &result->rows))
      perror("failed to read num rows");
    if (!fscanf(file, "%u", &result->dimensions))
      perror("failed to read num dimensions");

    // Allocate
    result->buf = malloc(result->dimensions * result->rows * sizeof(FLOAT));

    // Read into buffer
    for (uint32_t j = 0; j < result->rows; j++) {
      for (uint32_t i = 0; i < result->dimensions; i++) {
        if (!fscanf(file, FLOAT_FORMAT, &result->buf[result->rows * i + j]))
          perror("failed to read data");
      }
    }

    fclose(file);
  }

  return result;
}

struct labels *read_labels(char *path) {
  struct labels *result = malloc(sizeof(struct labels));

  // Open file
  FILE *file;
  {
    file = fopen(path, "r");
    if (!file)
      perror("failed to open file");

    if (!fscanf(file, "%u", &result->rows))
      perror("failed to read num rows");

    // Allocate
    result->buf = malloc(result->rows * sizeof(FLOAT));

    // Read into buffer
    for (uint32_t i = 0; i < result->rows; i++) {
      if (!fscanf(file, FLOAT_FORMAT, &result->buf[i]))
        perror("failed to read label");
    }

    fclose(file);
  }

  return result;
}