#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include "utils.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef _USE_MATH_DEFINES
#define _USE_MATH_DEFINES
#endif
#include <math.h>
#include <assert.h>
#include <float.h>
#include <limits.h>
#include "darkunistd.h"
#ifdef WIN32
#include "gettimeofday.h"
#else
#include <sys/time.h>
#include <sys/stat.h>
#endif


#ifndef USE_CMAKE_LIBS
#pragma warning(disable: 4996)
#endif

void *xmalloc(size_t size) {
    void *ptr=malloc(size);
    if(!ptr) {
        malloc_error();
    }
    return ptr;
}

void *xcalloc(size_t nmemb, size_t size) {
    void *ptr=calloc(nmemb,size);
    if(!ptr) {
        calloc_error();
    }
    return ptr;
}

void *xrealloc(void *ptr, size_t size) {
    ptr=realloc(ptr,size);
    if(!ptr) {
        realloc_error();
    }
    return ptr;
}

double what_time_is_it_now()
{
    struct timeval time;
    if (gettimeofday(&time, NULL)) {
        return 0;
    }
    return (double)time.tv_sec + (double)time.tv_usec * .000001;
}

int *read_map(char *filename)
{
    int n = 0;
    int *map = 0;
    char *str;
    FILE *file = fopen(filename, "r");
    if(!file) file_error(filename);
    while((str=fgetl(file))){
        ++n;
        map = (int*)xrealloc(map, n * sizeof(int));
        map[n-1] = atoi(str);
        free(str);
    }
    if (file) fclose(file);
    return map;
}

void sorta_shuffle(void *arr, size_t n, size_t size, size_t sections)
{
    size_t i;
    for(i = 0; i < sections; ++i){
        size_t start = n*i/sections;
        size_t end = n*(i+1)/sections;
        size_t num = end-start;
        shuffle((char*)arr+(start*size), num, size);
    }
}

void shuffle(void *arr, size_t n, size_t size)
{
    size_t i;
    void* swp = (void*)xcalloc(1, size);
    for(i = 0; i < n-1; ++i){
        size_t j = i + random_gen()/(RAND_MAX / (n-i)+1);
        memcpy(swp,            (char*)arr+(j*size), size);
        memcpy((char*)arr+(j*size), (char*)arr+(i*size), size);
        memcpy((char*)arr+(i*size), swp,          size);
    }
    free(swp);
}

void del_arg(int argc, char **argv, int index)
{
    int i;
    for(i = index; i < argc-1; ++i) argv[i] = argv[i+1];
    argv[i] = 0;
}

int find_arg(int argc, char* argv[], char *arg)
{
    int i;
    for(i = 0; i < argc; ++i) {
        if(!argv[i]) continue;
        if(0==strcmp(argv[i], arg)) {
            del_arg(argc, argv, i);
            return 1;
        }
    }
    return 0;
}

int find_int_arg(int argc, char **argv, char *arg, int def)
{
    int i;
    for(i = 0; i < argc-1; ++i){
        if(!argv[i]) continue;
        if(0==strcmp(argv[i], arg)){
            def = atoi(argv[i+1]);
            del_arg(argc, argv, i);
            del_arg(argc, argv, i);
            break;
        }
    }
    return def;
}

float find_float_arg(int argc, char **argv, char *arg, float def)
{
    int i;
    for(i = 0; i < argc-1; ++i){
        if(!argv[i]) continue;
        if(0==strcmp(argv[i], arg)){
            def = atof(argv[i+1]);
            del_arg(argc, argv, i);
            del_arg(argc, argv, i);
            break;
        }
    }
    return def;
}

char *find_char_arg(int argc, char **argv, char *arg, char *def)
{
    int i;
    for(i = 0; i < argc-1; ++i){
        if(!argv[i]) continue;
        if(0==strcmp(argv[i], arg)){
            def = argv[i+1];
            del_arg(argc, argv, i);
            del_arg(argc, argv, i);
            break;
        }
    }
    return def;
}


char *basecfg(char *cfgfile)
{
    char *c = cfgfile;
    char *next;
    while((next = strchr(c, '/')))
    {
        c = next+1;
    }
    if(!next) while ((next = strchr(c, '\\'))) { c = next + 1; }
    c = copy_string(c);
    next = strchr(c, '.');
    if (next) *next = 0;
    return c;
}

int alphanum_to_int(char c)
{
    return (c < 58) ? c - 48 : c-87;
}
char int_to_alphanum(int i)
{
    if (i == 36) return '.';
    return (i < 10) ? i + 48 : i + 87;
}

void pm(int M, int N, float *A)
{
    int i,j;
    for(i =0 ; i < M; ++i){
        printf("%d ", i+1);
        for(j = 0; j < N; ++j){
            printf("%2.4f, ", A[i*N+j]);
        }
        printf("\n");
    }
    printf("\n");
}

void find_replace(const char* str, char* orig, char* rep, char* output)
{
    char* buffer = (char*)calloc(8192, sizeof(char));
    char *p;

    sprintf(buffer, "%s", str);
    if (!(p = strstr(buffer, orig))) {  // Is 'orig' even in 'str'?
        sprintf(output, "%s", buffer);
        free(buffer);
        return;
    }

    *p = '\0';

    sprintf(output, "%s%s%s", buffer, rep, p + strlen(orig));
    free(buffer);
}

void trim(char *str)
{
    char* buffer = (char*)xcalloc(8192, sizeof(char));
    sprintf(buffer, "%s", str);

    char *p = buffer;
    while (*p == ' ' || *p == '\t') ++p;

    char *end = p + strlen(p) - 1;
    while (*end == ' ' || *end == '\t') {
        *end = '\0';
        --end;
    }
    sprintf(str, "%s", p);

    free(buffer);
}

void find_replace_extension(char *str, char *orig, char *rep, char *output)
{
    char* buffer = (char*)calloc(8192, sizeof(char));

    sprintf(buffer, "%s", str);
    char *p = strstr(buffer, orig);
    int offset = (p - buffer);
    int chars_from_end = strlen(buffer) - offset;
    if (!p || chars_from_end != strlen(orig)) {  // Is 'orig' even in 'str' AND is 'orig' found at the end of 'str'?
        sprintf(output, "%s", buffer);
        free(buffer);
        return;
    }

    *p = '\0';
    sprintf(output, "%s%s%s", buffer, rep, p + strlen(orig));
    free(buffer);
}

void replace_image_to_label(const char* input_path, char* output_path)
{
    find_replace(input_path, "/images/train2014/", "/labels/train2014/", output_path);    // COCO
    find_replace(output_path, "/images/val2014/", "/labels/val2014/", output_path);        // COCO
    find_replace(output_path, "/JPEGImages/", "/labels/", output_path);    // PascalVOC
    find_replace(output_path, "\\images\\train2014\\", "\\labels\\train2014\\", output_path);    // COCO
    find_replace(output_path, "\\images\\val2014\\", "\\labels\\val2014\\", output_path);        // COCO
    find_replace(output_path, "\\JPEGImages\\", "\\labels\\", output_path);    // PascalVOC
    //find_replace(output_path, "/images/", "/labels/", output_path);    // COCO
    //find_replace(output_path, "/VOC2007/JPEGImages/", "/VOC2007/labels/", output_path);        // PascalVOC
    //find_replace(output_path, "/VOC2012/JPEGImages/", "/VOC2012/labels/", output_path);        // PascalVOC

    //find_replace(output_path, "/raw/", "/labels/", output_path);
    trim(output_path);

    // replace only ext of files
    find_replace_extension(output_path, ".jpg", ".txt", output_path);
    find_replace_extension(output_path, ".JPG", ".txt", output_path); // error
    find_replace_extension(output_path, ".jpeg", ".txt", output_path);
    find_replace_extension(output_path, ".JPEG", ".txt", output_path);
    find_replace_extension(output_path, ".png", ".txt", output_path);
    find_replace_extension(output_path, ".PNG", ".txt", output_path);
    find_replace_extension(output_path, ".bmp", ".txt", output_path);
    find_replace_extension(output_path, ".BMP", ".txt", output_path);
    find_replace_extension(output_path, ".ppm", ".txt", output_path);
    find_replace_extension(output_path, ".PPM", ".txt", output_path);
    find_replace_extension(output_path, ".tiff", ".txt", output_path);
    find_replace_extension(output_path, ".TIFF", ".txt", output_path);

    // Check file ends with txt:
    if(strlen(output_path) > 4) {
        char *output_path_ext = output_path + strlen(output_path) - 4;
        if( strcmp(".txt", output_path_ext) != 0){
            fprintf(stderr, "Failed to infer label file name (check image extension is supported): %s \n", output_path);
        }
    }else{
        fprintf(stderr, "Label file name is too short: %s \n", output_path);
    }
}

float sec(clock_t clocks)
{
    return (float)clocks/CLOCKS_PER_SEC;
}

void top_k(float *a, int n, int k, int *index)
{
    int i,j;
    for(j = 0; j < k; ++j) index[j] = -1;
    for(i = 0; i < n; ++i){
        int curr = i;
        for(j = 0; j < k; ++j){
            if((index[j] < 0) || a[curr] > a[index[j]]){
                int swap = curr;
                curr = index[j];
                index[j] = swap;
            }
        }
    }
}

void error(const char *s)
{
    perror(s);
    assert(0);
    exit(EXIT_FAILURE);
}

void malloc_error()
{
    fprintf(stderr, "xMalloc error\n");
    exit(EXIT_FAILURE);
}

void calloc_error()
{
    fprintf(stderr, "Calloc error\n");
    exit(EXIT_FAILURE);
}

void realloc_error()
{
    fprintf(stderr, "Realloc error\n");
    exit(EXIT_FAILURE);
}

void file_error(char *s)
{
    fprintf(stderr, "Couldn't open file: %s\n", s);
    exit(EXIT_FAILURE);
}

list *split_str(char *s, char delim)
{
    size_t i;
    size_t len = strlen(s);
    list *l = make_list();
    list_insert(l, s);
    for(i = 0; i < len; ++i){
        if(s[i] == delim){
            s[i] = '\0';
            list_insert(l, &(s[i+1]));
        }
    }
    return l;
}

void strip(char *s)
{
    size_t i;
    size_t len = strlen(s);
    size_t offset = 0;
    for(i = 0; i < len; ++i){
        char c = s[i];
        if(c==' '||c=='\t'||c=='\n'||c =='\r'||c==0x0d||c==0x0a) ++offset;
        else s[i-offset] = c;
    }
    s[len-offset] = '\0';
}


void strip_args(char *s)
{
    size_t i;
    size_t len = strlen(s);
    size_t offset = 0;
    for (i = 0; i < len; ++i) {
        char c = s[i];
        if (c == '\t' || c == '\n' || c == '\r' || c == 0x0d || c == 0x0a) ++offset;
        else s[i - offset] = c;
    }
    s[len - offset] = '\0';
}

void strip_char(char *s, char bad)
{
    size_t i;
    size_t len = strlen(s);
    size_t offset = 0;
    for(i = 0; i < len; ++i){
        char c = s[i];
        if(c==bad) ++offset;
        else s[i-offset] = c;
    }
    s[len-offset] = '\0';
}

void free_ptrs(void **ptrs, int n)
{
    int i;
    for(i = 0; i < n; ++i) free(ptrs[i]);
    free(ptrs);
}

char *fgetl(FILE *fp)
{
    if(feof(fp)) return 0;
    size_t size = 512;
    char* line = (char*)xmalloc(size * sizeof(char));
    if(!fgets(line, size, fp)){
        free(line);
        return 0;
    }

    size_t curr = strlen(line);

    while((line[curr-1] != '\n') && !feof(fp)){
        if(curr == size-1){
            size *= 2;
            line = (char*)xrealloc(line, size * sizeof(char));
        }
        size_t readsize = size-curr;
        if(readsize > INT_MAX) readsize = INT_MAX-1;
        fgets(&line[curr], readsize, fp);
        curr = strlen(line);
    }
    if(curr >= 2)
        if(line[curr-2] == 0x0d) line[curr-2] = 0x00;

    if(curr >= 1)
        if(line[curr-1] == 0x0a) line[curr-1] = 0x00;

    return line;
}

int read_int(int fd)
{
    int n = 0;
    int next = read(fd, &n, sizeof(int));
    if(next <= 0) return -1;
    return n;
}

void write_int(int fd, int n)
{
    int next = write(fd, &n, sizeof(int));
    if(next <= 0) error("read failed");
}

int read_all_fail(int fd, char *buffer, size_t bytes)
{
    size_t n = 0;
    while(n < bytes){
        int next = read(fd, buffer + n, bytes-n);
        if(next <= 0) return 1;
        n += next;
    }
    return 0;
}

int write_all_fail(int fd, char *buffer, size_t bytes)
{
    size_t n = 0;
    while(n < bytes){
        size_t next = write(fd, buffer + n, bytes-n);
        if(next <= 0) return 1;
        n += next;
    }
    return 0;
}

void read_all(int fd, char *buffer, size_t bytes)
{
    size_t n = 0;
    while(n < bytes){
        int next = read(fd, buffer + n, bytes-n);
        if(next <= 0) error("read failed");
        n += next;
    }
}

void write_all(int fd, char *buffer, size_t bytes)
{
    size_t n = 0;
    while(n < bytes){
        size_t next = write(fd, buffer + n, bytes-n);
        if(next <= 0) error("write failed");
        n += next;
    }
}


char *copy_string(char *s)
{
    if(!s) {
        return NULL;
    }
    char* copy = (char*)xmalloc(strlen(s) + 1);
    strncpy(copy, s, strlen(s)+1);
    return copy;
}

list *parse_csv_line(char *line)
{
    list *l = make_list();
    char *c, *p;
    int in = 0;
    for(c = line, p = line; *c != '\0'; ++c){
        if(*c == '"') in = !in;
        else if(*c == ',' && !in){
            *c = '\0';
            list_insert(l, copy_string(p));
            p = c+1;
        }
    }
    list_insert(l, copy_string(p));
    return l;
}

int count_fields(char *line)
{
    int count = 0;
    int done = 0;
    char *c;
    for(c = line; !done; ++c){
        done = (*c == '\0');
        if(*c == ',' || done) ++count;
    }
    return count;
}

float *parse_fields(char *line, int n)
{
    float* field = (float*)xcalloc(n, sizeof(float));
    char *c, *p, *end;
    int count = 0;
    int done = 0;
    for(c = line, p = line; !done; ++c){
        done = (*c == '\0');
        if(*c == ',' || done){
            *c = '\0';
            field[count] = strtod(p, &end);
            if(p == c) field[count] = nan("");
            if(end != c && (end != c-1 || *end != '\r')) field[count] = nan(""); //DOS file formats!
            p = c+1;
            ++count;
        }
    }
    return field;
}

float sum_array(float *a, int n)
{
    int i;
    float sum = 0;
    for(i = 0; i < n; ++i) sum += a[i];
    return sum;
}

float mean_array(float *a, int n)
{
    return sum_array(a,n)/n;
}

void mean_arrays(float **a, int n, int els, float *avg)
{
    int i;
    int j;
    memset(avg, 0, els*sizeof(float));
    for(j = 0; j < n; ++j){
        #pragma omp parallel for
        for(i = 0; i < els; ++i){
            avg[i] += a[j][i];
        }
    }
    #pragma omp parallel for
    for(i = 0; i < els; ++i){
        avg[i] /= n;
    }
}

void print_statistics(float *a, int n)
{
    float m = mean_array(a, n);
    float v = variance_array(a, n);
    printf("MSE: %.6f, Mean: %.6f, Variance: %.6f\n", mse_array(a, n), m, v);
}

float variance_array(float *a, int n)
{
    int i;
    float sum = 0;
    float mean = mean_array(a, n);
    for(i = 0; i < n; ++i) sum += (a[i] - mean)*(a[i]-mean);
    float variance = sum/n;
    return variance;
}

int constrain_int(int a, int min, int max)
{
    if (a < min) return min;
    if (a > max) return max;
    return a;
}

float constrain(float min, float max, float a)
{
    if (a < min) return min;
    if (a > max) return max;
    return a;
}

float dist_array(float *a, float *b, int n, int sub)
{
    int i;
    float sum = 0;
    for(i = 0; i < n; i += sub) sum += pow(a[i]-b[i], 2);
    return sqrt(sum);
}

float mse_array(float *a, int n)
{
    int i;
    float sum = 0;
    for(i = 0; i < n; ++i) sum += a[i]*a[i];
    return sqrt(sum/n);
}

void normalize_array(float *a, int n)
{
    int i;
    float mu = mean_array(a,n);
    float sigma = sqrt(variance_array(a,n));
    for(i = 0; i < n; ++i){
        a[i] = (a[i] - mu)/sigma;
    }
    mu = mean_array(a,n);
    sigma = sqrt(variance_array(a,n));
}

void translate_array(float *a, int n, float s)
{
    int i;
    for(i = 0; i < n; ++i){
        a[i] += s;
    }
}

float mag_array(float *a, int n)
{
    int i;
    float sum = 0;
    for(i = 0; i < n; ++i){
        sum += a[i]*a[i];
    }
    return sqrt(sum);
}

// indicies to skip is a bit array
float mag_array_skip(float *a, int n, int * indices_to_skip)
{
    int i;
    float sum = 0;
    for (i = 0; i < n; ++i) {
        if (indices_to_skip[i] != 1) {
            sum += a[i] * a[i];
        }
    }
    return sqrt(sum);
}

void scale_array(float *a, int n, float s)
{
    int i;
    for(i = 0; i < n; ++i){
        a[i] *= s;
    }
}

int sample_array(float *a, int n)
{
    float sum = sum_array(a, n);
    scale_array(a, n, 1. / sum);
    float r = rand_uniform(0, 1);
    int i;
    for (i = 0; i < n; ++i) {
        r = r - a[i];
        if (r <= 0) return i;
    }
    return n - 1;
}

int sample_array_custom(float *a, int n)
{
    float sum = sum_array(a, n);
    scale_array(a, n, 1./sum);
    float r = rand_uniform(0, 1);
    int start_index = rand_int(0, 0);
    int i;
    for(i = 0; i < n; ++i){
        r = r - a[(i + start_index) % n];
        if (r <= 0) return i;
    }
    return n-1;
}

int max_index(float *a, int n)
{
    if(n <= 0) return -1;
    int i, max_i = 0;
    float max = a[0];
    for(i = 1; i < n; ++i){
        if(a[i] > max){
            max = a[i];
            max_i = i;
        }
    }
    return max_i;
}

int top_max_index(float *a, int n, int k)
{
    if (n <= 0) return -1;
    float *values = (float*)xcalloc(k, sizeof(float));
    int *indexes = (int*)xcalloc(k, sizeof(int));
    int i, j;
    for (i = 0; i < n; ++i) {
        for (j = 0; j < k; ++j) {
            if (a[i] > values[j]) {
                values[j] = a[i];
                indexes[j] = i;
                break;
            }
        }
    }
    int count = 0;
    for (j = 0; j < k; ++j) if (values[j] > 0) count++;
    int get_index = rand_int(0, count-1);
    int val = indexes[get_index];
    free(indexes);
    free(values);
    return val;
}


int int_index(int *a, int val, int n)
{
    int i;
    for (i = 0; i < n; ++i) {
        if (a[i] == val) return i;
    }
    return -1;
}

int rand_int(int min, int max)
{
    if (max < min){
        int s = min;
        min = max;
        max = s;
    }
    int r = (random_gen()%(max - min + 1)) + min;
    return r;
}

// From http://en.wikipedia.org/wiki/Box%E2%80%93Muller_transform
float rand_normal()
{
    static int haveSpare = 0;
    static double rand1, rand2;

    if(haveSpare)
    {
        haveSpare = 0;
        return sqrt(rand1) * sin(rand2);
    }

    haveSpare = 1;

    rand1 = random_gen() / ((double) RAND_MAX);
    if(rand1 < 1e-100) rand1 = 1e-100;
    rand1 = -2 * log(rand1);
    rand2 = (random_gen() / ((double)RAND_MAX)) * 2.0 * M_PI;

    return sqrt(rand1) * cos(rand2);
}

/*
   float rand_normal()
   {
   int n = 12;
   int i;
   float sum= 0;
   for(i = 0; i < n; ++i) sum += (float)random_gen()/RAND_MAX;
   return sum-n/2.;
   }
 */

size_t rand_size_t()
{
    return  ((size_t)(random_gen()&0xff) << 56) |
            ((size_t)(random_gen()&0xff) << 48) |
            ((size_t)(random_gen()&0xff) << 40) |
            ((size_t)(random_gen()&0xff) << 32) |
            ((size_t)(random_gen()&0xff) << 24) |
            ((size_t)(random_gen()&0xff) << 16) |
            ((size_t)(random_gen()&0xff) << 8) |
            ((size_t)(random_gen()&0xff) << 0);
}

float rand_uniform(float min, float max)
{
    if(max < min){
        float swap = min;
        min = max;
        max = swap;
    }

#if (RAND_MAX < 65536)
        int rnd = rand()*(RAND_MAX + 1) + rand();
        return ((float)rnd / (RAND_MAX*RAND_MAX) * (max - min)) + min;
#else
        return ((float)rand() / RAND_MAX * (max - min)) + min;
#endif
    //return (random_float() * (max - min)) + min;
}

float rand_scale(float s)
{
    float scale = rand_uniform_strong(1, s);
    if(random_gen()%2) return scale;
    return 1./scale;
}

float **one_hot_encode(float *a, int n, int k)
{
    int i;
    float** t = (float**)xcalloc(n, sizeof(float*));
    for(i = 0; i < n; ++i){
        t[i] = (float*)xcalloc(k, sizeof(float));
        int index = (int)a[i];
        t[i][index] = 1;
    }
    return t;
}

static unsigned int x = 123456789, y = 362436069, z = 521288629;

// Marsaglia's xorshf96 generator: period 2^96-1
unsigned int random_gen_fast(void)
{
    unsigned int t;
    x ^= x << 16;
    x ^= x >> 5;
    x ^= x << 1;

    t = x;
    x = y;
    y = z;
    z = t ^ x ^ y;

    return z;
}

float random_float_fast()
{
    return ((float)random_gen_fast() / (float)UINT_MAX);
}

int rand_int_fast(int min, int max)
{
    if (max < min) {
        int s = min;
        min = max;
        max = s;
    }
    int r = (random_gen_fast() % (max - min + 1)) + min;
    return r;
}

unsigned int random_gen()
{
    unsigned int rnd = 0;
#ifdef WIN32
    rand_s(&rnd);
#else   // WIN32
    rnd = rand();
#if (RAND_MAX < 65536)
        rnd = rand()*(RAND_MAX + 1) + rnd;
#endif  //(RAND_MAX < 65536)
#endif  // WIN32
    return rnd;
}

float random_float()
{
    unsigned int rnd = 0;
#ifdef WIN32
    rand_s(&rnd);
    return ((float)rnd / (float)UINT_MAX);
#else   // WIN32

    rnd = rand();
#if (RAND_MAX < 65536)
    rnd = rand()*(RAND_MAX + 1) + rnd;
    return((float)rnd / (float)(RAND_MAX*RAND_MAX));
#endif  //(RAND_MAX < 65536)
    return ((float)rnd / (float)RAND_MAX);

#endif  // WIN32
}

float rand_uniform_strong(float min, float max)
{
    if (max < min) {
        float swap = min;
        min = max;
        max = swap;
    }
    return (random_float() * (max - min)) + min;
}

float rand_precalc_random(float min, float max, float random_part)
{
    if (max < min) {
        float swap = min;
        min = max;
        max = swap;
    }
    return (random_part * (max - min)) + min;
}

#define RS_SCALE (1.0 / (1.0 + RAND_MAX))

double double_rand(void)
{
    double d;
    do {
        d = (((rand() * RS_SCALE) + rand()) * RS_SCALE + rand()) * RS_SCALE;
    } while (d >= 1); // Round off
    return d;
}

unsigned int uint_rand(unsigned int less_than)
{
    return (unsigned int)((less_than)* double_rand());
}

int check_array_is_nan(float *arr, int size)
{
    int i;
    for (i = 0; i < size; ++i) {
        if (isnan(arr[i])) return 1;
    }
    return 0;
}

int check_array_is_inf(float *arr, int size)
{
    int i;
    for (i = 0; i < size; ++i) {
        if (isinf(arr[i])) return 1;
    }
    return 0;
}

int *random_index_order(int min, int max)
{
    int *inds = (int *)xcalloc(max - min, sizeof(int));
    int i;
    for (i = min; i < max; ++i) {
        inds[i - min] = i;
    }
    for (i = min; i < max - 1; ++i) {
        int swap = inds[i - min];
        int index = i + rand() % (max - i);
        inds[i - min] = inds[index - min];
        inds[index - min] = swap;
    }
    return inds;
}

int max_int_index(int *a, int n)
{
    if (n <= 0) return -1;
    int i, max_i = 0;
    int max = a[0];
    for (i = 1; i < n; ++i) {
        if (a[i] > max) {
            max = a[i];
            max_i = i;
        }
    }
    return max_i;
}


// Absolute box from relative coordinate bounding box and image size
boxabs box_to_boxabs(const box* b, const int img_w, const int img_h, const int bounds_check)
{
    boxabs ba;
    ba.left = (b->x - b->w / 2.)*img_w;
    ba.right = (b->x + b->w / 2.)*img_w;
    ba.top = (b->y - b->h / 2.)*img_h;
    ba.bot = (b->y + b->h / 2.)*img_h;

    if (bounds_check) {
        if (ba.left < 0) ba.left = 0;
        if (ba.right > img_w - 1) ba.right = img_w - 1;
        if (ba.top < 0) ba.top = 0;
        if (ba.bot > img_h - 1) ba.bot = img_h - 1;
    }

    return ba;
}

int make_directory(char *path, int mode)
{
#ifdef WIN32
    return _mkdir(path);
#else
    return mkdir(path, mode);
#endif
}
