/*

 * Hedgewars, a free turn based strategy game

 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

 */

#include "buffer.h"

#include "logging.h"

#include "util.h"

#include <stdlib.h>

#include <limits.h>

#include <string.h>

#define MIN_VECTOR_CAPACITY 16

struct _flib_vector {

    void *data;

    size_t size;

    size_t capacity;

};

flib_vector *flib_vector_create() {

    flib_vector *result = NULL;

    flib_vector *tmpVector = flib_calloc(1, sizeof(flib_vector));

    if(tmpVector) {

        tmpVector->data = flib_malloc(MIN_VECTOR_CAPACITY);

        if(tmpVector->data) {

            tmpVector->size = 0;

            tmpVector->capacity = MIN_VECTOR_CAPACITY;

            result = tmpVector;

            tmpVector = NULL;

        }

    }

    flib_vector_destroy(tmpVector);

    return result;

}

void flib_vector_destroy(flib_vector *vec) {

    if(vec) {

        free(vec->data);

        free(vec);

    }

}

static int setCapacity(flib_vector *vec, size_t newCapacity) {

    if(newCapacity == vec->capacity) {

        return 0;

    }

    void *newData = realloc(vec->data, newCapacity);

    if(newData) {

        vec->data = newData;

        vec->capacity = newCapacity;

        return 0;

    } else {

        return -1;

    }

}

static int allocateExtraCapacity(flib_vector *vec, size_t extraCapacity) {

    if(extraCapacity <= SIZE_MAX - vec->capacity) {

        return setCapacity(vec, vec->capacity + extraCapacity);

    } else {

        return -1;

    }

}

int flib_vector_resize(flib_vector *vec, size_t newSize) {

    if(log_badargs_if(vec==NULL)) {

        return -1;

    }

    if(vec->capacity < newSize) {

        // Resize exponentially for constant amortized time,

        // But at least by as much as we need of course

        size_t extraCapacity = (vec->capacity)/2;

        size_t minExtraCapacity = newSize - vec->capacity;

        if(extraCapacity < minExtraCapacity) {

            extraCapacity = minExtraCapacity;

        }

        if(allocateExtraCapacity(vec, extraCapacity)) {

            allocateExtraCapacity(vec, minExtraCapacity);

        }

    } else if(vec->capacity/2 > newSize) {

        size_t newCapacity = newSize+newSize/4;

        if(newCapacity < MIN_VECTOR_CAPACITY) {

            newCapacity = MIN_VECTOR_CAPACITY;

        }

        setCapacity(vec, newCapacity);

    }

    if(vec->capacity >= newSize) {

        vec->size = newSize;

        return 0;

    } else {

        return -1;

    }

}

int flib_vector_append(flib_vector *vec, const void *data, size_t len) {

    if(!log_badargs_if2(vec==NULL, data==NULL && len>0)

            && !log_oom_if(len > SIZE_MAX-vec->size)) {

        size_t oldSize = vec->size;

        if(!log_oom_if(flib_vector_resize(vec, vec->size+len))) {

            memmove(((uint8_t*)vec->data) + oldSize, data, len);

            return 0;

        }

    }

    return -1;

}

int flib_vector_appendf(flib_vector *vec, const char *fmt, ...) {

    int result = -1;

    if(!log_badargs_if2(vec==NULL, fmt==NULL)) {

        va_list argp;

        va_start(argp, fmt);

        char *formatted = flib_vasprintf(fmt, argp);

        va_end(argp);

        if(formatted) {

            size_t len = strlen(formatted);

            result = flib_vector_append(vec, formatted, len);

        }

    }

    return result;

}

flib_buffer flib_vector_as_buffer(flib_vector *vec) {

    if(log_badargs_if(vec==NULL)) {

        flib_buffer result = {NULL, 0};

        return result;

    } else {

        flib_buffer result = {vec->data, vec->size};

        return result;

    }

}

flib_constbuffer flib_vector_as_constbuffer(flib_vector *vec) {

    if(log_badargs_if(vec==NULL)) {

        flib_constbuffer result = {NULL, 0};

        return result;

    } else {

        flib_constbuffer result = {vec->data, vec->size};

        return result;

    }

}

void *flib_vector_data(flib_vector *vec) {

    if(log_badargs_if(vec==NULL)) {

        return NULL;

    } else {

        return vec->data;

    }

}

size_t flib_vector_size(flib_vector *vec) {

    if(log_badargs_if(vec==NULL)) {

        return 0;

    } else {

        return vec->size;

    }

}