#include <passgen/assert.h>

#include <passgen/config.h>

#include <passgen/container/array.h>

#include <stdlib.h>

#include <string.h>

#define SIZE_INITIAL 4

void passgen_array_realloc(passgen_array *array, size_t capacity) {

    array->data = realloc(array->data, capacity * sizeof(void *));

    array->capacity = capacity;

}

// Initialize array. Optionally takes a capacity, if so, memory that is

// sufficiently large to hold `capacity` items will be allocated.

void passgen_array_init(passgen_array *array, size_t capacity) {

    memset(array, 0, sizeof(*array));

    if(capacity) {

        passgen_array_realloc(array, capacity);

    }

}

// Push an item to the back of the array.

void passgen_array_push(passgen_array *array, void *pointer) {

    if(!array->data) {

        passgen_array_realloc(array, SIZE_INITIAL);

    }

    if(array->items == array->capacity) {

        passgen_array_realloc(array, array->capacity * 2);

    }

    array->data[array->items] = pointer;

    array->items += 1;

}

// Retrieve an item from the array.

void *passgen_array_get(passgen_array *array, size_t pos) {

#ifdef PASSGEN_DEBUG

    passgen_assert(pos <= array->items);

#endif

    return array->data[pos];

}

// Frees an array.

void passgen_array_free(passgen_array *array) {

    free(array->data);

    memset(array, 0, sizeof(*array));

}

// Pops the last item off the array and returns it.

void *passgen_array_pop(passgen_array *array) {

    if(!array->items) {

        return NULL;

    }

    array->items -= 1;

    return array->data[array->items];

}