/*****************************************************************************
 * This file is part of uvg266 VVC encoder.
 *
 * Copyright (c) 2021, Tampere University, ITU/ISO/IEC, project contributors
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * 
 * * Redistributions in binary form must reproduce the above copyright notice, this
 *   list of conditions and the following disclaimer in the documentation and/or
 *   other materials provided with the distribution.
 * 
 * * Neither the name of the Tampere University or ITU/ISO/IEC nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY OUT OF THE USE OF THIS
 ****************************************************************************/

#include "imagelist.h"

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

#include "image.h"
#include "threads.h"


/**
 * \brief Allocate memory for image_list
 * \param size  initial array size
 * \return image_list pointer, NULL on failure
 */
image_list_t * uvg_image_list_alloc(int size)
{
  image_list_t *list = (image_list_t *)malloc(sizeof(image_list_t));
  list->size      = size;
  list->images    = malloc(sizeof(uvg_picture*)  * size);
  list->cu_arrays = malloc(sizeof(cu_array_t*)   * size);
  list->pocs      = malloc(sizeof(int32_t)       * size);
  list->ref_LXs   = malloc(sizeof(*list->ref_LXs) * size);
  list->used_size = 0;

  return list;
}

/**
 * \brief Resize image_list array
 * \param list  image_list pointer
 * \param size  new array size
 * \return 1 on success, 0 on failure
 */
int uvg_image_list_resize(image_list_t *list, unsigned size)
{
  list->images = (uvg_picture**)realloc(list->images, sizeof(uvg_picture*) * size);
  list->cu_arrays = (cu_array_t**)realloc(list->cu_arrays, sizeof(cu_array_t*) * size);
  list->pocs = realloc(list->pocs, sizeof(int32_t) * size);
  list->ref_LXs = realloc(list->ref_LXs, sizeof(*list->ref_LXs) * size);
  list->size = size;
  return size == 0 || (list->images && list->cu_arrays && list->pocs);
}

/**
 * \brief Free memory allocated to the picture_list
 * \param list image_list pointer
 * \return 1 on success, 0 on failure
 */
int uvg_image_list_destroy(image_list_t *list)
{
  unsigned int i;
  if (list->used_size > 0) {
    for (i = 0; i < list->used_size; ++i) {
      uvg_image_free(list->images[i]);
      list->images[i] = NULL;
      uvg_cu_array_free(&list->cu_arrays[i]);
      list->cu_arrays[i] = NULL;
      list->pocs[i] = 0;
      for (int j = 0; j < 16; j++) {
        list->ref_LXs[i][0][j] = 0;
        list->ref_LXs[i][1][j] = 0;
      }
    }
  }

  if (list->size > 0) {
    free(list->images);
    free(list->cu_arrays);
    free(list->pocs);
    free(list->ref_LXs);
  }
  list->images = NULL;
  list->cu_arrays = NULL;
  list->pocs = NULL;
  list->ref_LXs = NULL;
  free(list);
  return 1;
}

/**
 * \brief Add picture to the front of the picturelist
 * \param pic picture pointer to add
 * \param picture_list list to use
 * \return 1 on success
 */
int uvg_image_list_add(image_list_t *list, uvg_picture *im, cu_array_t *cua, int32_t poc, uint8_t ref_LX[2][16])
{
  int i = 0;
  if (UVG_ATOMIC_INC(&(im->refcount)) == 1) {
    fprintf(stderr, "Tried to add an unreferenced picture. This is a bug!\n");
    assert(0); //Stop for debugging
    return 0;
  }
  
  if (UVG_ATOMIC_INC(&(cua->refcount)) == 1) {
    fprintf(stderr, "Tried to add an unreferenced cu_array. This is a bug!\n");
    assert(0); //Stop for debugging
    return 0;
  }

  if (list->size == list->used_size) {
    unsigned new_size = MAX(list->size + 1, list->size * 2);
    if (!uvg_image_list_resize(list, new_size)) return 0;
  }
  
  for (i = list->used_size; i > 0; i--) {
    list->images[i] = list->images[i - 1];
    list->cu_arrays[i] = list->cu_arrays[i - 1];
    list->pocs[i] = list->pocs[i - 1];
    for (int j = 0; j < 16; j++) {
      list->ref_LXs[i][0][j] = list->ref_LXs[i - 1][0][j];
      list->ref_LXs[i][1][j] = list->ref_LXs[i - 1][1][j];
    }
  }

  list->images[0] = im;
  list->cu_arrays[0] = cua;
  list->pocs[0] = poc;
  for (int j = 0; j < 16; j++) {
    list->ref_LXs[0][0][j] = ref_LX[0][j];
    list->ref_LXs[0][1][j] = ref_LX[1][j];
  }
  
  list->used_size++;
  return 1;
}

/**
 * \brief Remove picture from picturelist
 * \param list list to use
 * \param n index to remove
 * \return 1 on success
 */
int uvg_image_list_rem(image_list_t * const list, const unsigned n)
{
  // Must be within list boundaries
  if (n >= list->used_size)
  {
    return 0;
  }

  uvg_image_free(list->images[n]);

  uvg_cu_array_free(&list->cu_arrays[n]);

  // The last item is easy to remove
  if (n == list->used_size - 1) {
    list->images[n] = NULL;
    list->cu_arrays[n] = NULL;
    list->pocs[n] = 0;
    for (int j = 0; j < 16; j++) {
      list->ref_LXs[n][0][j] = 0;
      list->ref_LXs[n][1][j] = 0;
    }
    list->used_size--;
  } else {
    uint32_t i = n;
    // Shift all following pics one backward in the list
    for (i = n; i < list->used_size - 1; ++i) {
      list->images[i] = list->images[i + 1];
      list->cu_arrays[i] = list->cu_arrays[i + 1];
      list->pocs[i] = list->pocs[i + 1];
      for (uint32_t j = 0; j < 16; j++) {
        list->ref_LXs[i][0][j] = list->ref_LXs[i + 1][0][j];
        list->ref_LXs[i][1][j] = list->ref_LXs[i + 1][1][j];
      }
    }
    list->images[list->used_size - 1] = NULL;
    list->cu_arrays[list->used_size - 1] = NULL;
    list->pocs[list->used_size - 1] = 0;
    for (int j = 0; j < 16; j++) {
      list->ref_LXs[list->used_size - 1][0][j] = 0;
      list->ref_LXs[list->used_size - 1][1][j] = 0;
    }
    list->used_size--;
  }

  return 1;
}

int uvg_image_list_copy_contents(image_list_t *target, image_list_t *source) {
  int i;
  while (target->used_size > 0) {
    uvg_image_list_rem(target, 0);
  }
  
  for (i = source->used_size - 1; i >= 0; --i) {
    uvg_image_list_add(target, source->images[i], source->cu_arrays[i], source->pocs[i], source->ref_LXs[i]);
  }
  return 1;
}