/*
 * (C) Copyright 2005- ECMWF.
 *
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
 * virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
 */

/***************************************************************************
 *
 *   Enrico Fucile
 *
 ***************************************************************************/

#include "grib_api_internal.h"

/* For debugging purposes */
void grib_iarray_print(const char* title, const grib_iarray* iarray)
{
    size_t i;
    Assert(iarray);
    printf("%s: iarray.n=%lu  \t", title, (unsigned long)iarray->n);
    for (i = 0; i < iarray->n; i++) {
        printf("iarray[%lu]=%ld\t", (unsigned long)i, iarray->v[i]);
    }
    printf("\n");
}

grib_iarray* grib_iarray_new_from_array(grib_context* c, long* a, size_t size)
{
    size_t i;
    grib_iarray* v;

    if (!c)
        c = grib_context_get_default();

    v = grib_iarray_new(c, size, 100);
    for (i = 0; i < size; i++)
        v->v[i] = a[i];
    v->n                   = size;
    v->number_of_pop_front = 0;
    v->context             = c;
    return v;
}

grib_iarray* grib_iarray_new(grib_context* c, size_t size, size_t incsize)
{
    grib_iarray* v = NULL;

    if (!c)
        c = grib_context_get_default();

    v = (grib_iarray*)grib_context_malloc(c, sizeof(grib_iarray));
    if (!v) {
        grib_context_log(c, GRIB_LOG_ERROR,
                         "grib_iarray_new unable to allocate %ld bytes\n", sizeof(grib_iarray));
        return NULL;
    }
    v->context             = c;
    v->size                = size;
    v->n                   = 0;
    v->incsize             = incsize;
    v->v                   = (long*)grib_context_malloc(c, sizeof(long) * size);
    v->number_of_pop_front = 0;
    if (!v->v) {
        grib_context_log(c, GRIB_LOG_ERROR,
                         "grib_iarray_new unable to allocate %ld bytes\n", sizeof(long) * size);
        return NULL;
    }
    return v;
}

long grib_iarray_pop(grib_iarray* a)
{
    a->n -= 1;
    return a->v[a->n];
}

long grib_iarray_pop_front(grib_iarray* a)
{
    long v = a->v[0];
    /* size_t i=0; */
    if (a->n == 0)
        Assert(0);
    a->n--;
    a->v++;
    a->number_of_pop_front++;
    /* for (i=0;i<a->n;i++) a->v[i]=a->v[i+1]; */

    return v;
}

static grib_iarray* grib_iarray_resize_to(grib_iarray* v, size_t newsize)
{
    long* newv;
    size_t i;
    grib_context* c = v->context;

    if (newsize < v->size)
        return v;

    if (!c)
        c = grib_context_get_default();

    newv = (long*)grib_context_malloc_clear(c, newsize * sizeof(long));
    if (!newv) {
        grib_context_log(c, GRIB_LOG_ERROR,
                         "grib_iarray_resize unable to allocate %ld bytes\n", sizeof(long) * newsize);
        return NULL;
    }

    for (i = 0; i < v->n; i++)
        newv[i] = v->v[i];

    v->v -= v->number_of_pop_front;
    grib_context_free(c, v->v);

    v->v                   = newv;
    v->size                = newsize;
    v->number_of_pop_front = 0;

    return v;
}

static grib_iarray* grib_iarray_resize(grib_iarray* v)
{
    const int newsize = v->incsize + v->size;
    return grib_iarray_resize_to(v, newsize);
}

grib_iarray* grib_iarray_push(grib_iarray* v, long val)
{
    size_t start_size    = 100;
    size_t start_incsize = 100;

    if (!v)
        v = grib_iarray_new(0, start_size, start_incsize);

    if (v->n >= v->size - v->number_of_pop_front)
        v = grib_iarray_resize(v);

    v->v[v->n] = val;
    v->n++;
    return v;
}

grib_iarray* grib_iarray_push_front(grib_iarray* v, long val)
{
    size_t start_size    = 100;
    size_t start_incsize = 100;
    int i;
    if (!v)
        v = grib_iarray_new(0, start_size, start_incsize);

    if (v->number_of_pop_front) {
        v->v--;
        v->number_of_pop_front--;
    }
    else {
        if (v->n >= v->size)
            v = grib_iarray_resize(v);
        for (i = v->n; i > 0; i--)
            v[i] = v[i - 1];
    }
    v->v[0] = val;
    v->n++;

    return v;
}

grib_iarray* grib_iarray_push_array(grib_iarray* v, long* val, size_t size)
{
    size_t start_size    = size;
    size_t start_incsize = 100;
    long* vp             = 0;
    long* valp           = val;
    if (!v)
        v = grib_iarray_new(0, start_size, start_incsize);

    v  = grib_iarray_resize_to(v, size + v->n);
    vp = v->v + v->n + v->number_of_pop_front;
    v->n += size;
    while (size) {
        *(vp++) = *(valp++);
        size--;
    }
    return v;
}

void grib_iarray_delete(grib_iarray* v)
{
    grib_context* c;

    if (!v)
        return;
    c = v->context;

    grib_iarray_delete_array(v);

    grib_context_free(c, v);
}

void grib_iarray_delete_array(grib_iarray* v)
{
    grib_context* c;

    if (!v)
        return;
    c = v->context;

    if (v->v) {
        long* vv = v->v - v->number_of_pop_front;
        grib_context_free(c, vv);
    }
}

long* grib_iarray_get_array(grib_iarray* v)
{
    long* vv;
    size_t i;
    grib_context* c = v->context;
    DebugAssert(c);

    vv = (long*)grib_context_malloc_clear(c, sizeof(long) * v->n);
    for (i = 0; i < v->n; i++)
        vv[i] = v->v[i];

    return vv;
}

size_t grib_iarray_used_size(grib_iarray* v)
{
    return v == NULL ? 0 : v->n;
}