/*
 * 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.
 *
 * Copyright 2011, Blender Foundation.
 */

#include "COM_CompositorOperation.h"
#include "BKE_global.h"
#include "BKE_image.h"
#include "BLI_listbase.h"
#include "MEM_guardedalloc.h"

#include "BLI_threads.h"

#include "RE_pipeline.h"
#include "RE_texture.h"

#include "render_types.h"

#include "PIL_time.h"

namespace blender::compositor {

CompositorOperation::CompositorOperation()
{
  this->addInputSocket(DataType::Color);
  this->addInputSocket(DataType::Value);
  this->addInputSocket(DataType::Value);

  this->setRenderData(nullptr);
  this->m_outputBuffer = nullptr;
  this->m_depthBuffer = nullptr;
  this->m_imageInput = nullptr;
  this->m_alphaInput = nullptr;
  this->m_depthInput = nullptr;

  this->m_useAlphaInput = false;
  this->m_active = false;

  this->m_scene = nullptr;
  this->m_sceneName[0] = '\0';
  this->m_viewName = nullptr;

  flags.use_render_border = true;
}

void CompositorOperation::initExecution()
{
  if (!this->m_active) {
    return;
  }

  // When initializing the tree during initial load the width and height can be zero.
  this->m_imageInput = getInputSocketReader(0);
  this->m_alphaInput = getInputSocketReader(1);
  this->m_depthInput = getInputSocketReader(2);
  if (this->getWidth() * this->getHeight() != 0) {
    this->m_outputBuffer = (float *)MEM_callocN(
        sizeof(float[4]) * this->getWidth() * this->getHeight(), "CompositorOperation");
  }
  if (this->m_depthInput != nullptr) {
    this->m_depthBuffer = (float *)MEM_callocN(
        sizeof(float) * this->getWidth() * this->getHeight(), "CompositorOperation");
  }
}

void CompositorOperation::deinitExecution()
{
  if (!this->m_active) {
    return;
  }

  if (!isBraked()) {
    Render *re = RE_GetSceneRender(this->m_scene);
    RenderResult *rr = RE_AcquireResultWrite(re);

    if (rr) {
      RenderView *rv = RE_RenderViewGetByName(rr, this->m_viewName);

      if (rv->rectf != nullptr) {
        MEM_freeN(rv->rectf);
      }
      rv->rectf = this->m_outputBuffer;
      if (rv->rectz != nullptr) {
        MEM_freeN(rv->rectz);
      }
      rv->rectz = this->m_depthBuffer;
      rr->have_combined = true;
    }
    else {
      if (this->m_outputBuffer) {
        MEM_freeN(this->m_outputBuffer);
      }
      if (this->m_depthBuffer) {
        MEM_freeN(this->m_depthBuffer);
      }
    }

    if (re) {
      RE_ReleaseResult(re);
      re = nullptr;
    }

    BLI_thread_lock(LOCK_DRAW_IMAGE);
    BKE_image_signal(G.main,
                     BKE_image_ensure_viewer(G.main, IMA_TYPE_R_RESULT, "Render Result"),
                     nullptr,
                     IMA_SIGNAL_FREE);
    BLI_thread_unlock(LOCK_DRAW_IMAGE);
  }
  else {
    if (this->m_outputBuffer) {
      MEM_freeN(this->m_outputBuffer);
    }
    if (this->m_depthBuffer) {
      MEM_freeN(this->m_depthBuffer);
    }
  }

  this->m_outputBuffer = nullptr;
  this->m_depthBuffer = nullptr;
  this->m_imageInput = nullptr;
  this->m_alphaInput = nullptr;
  this->m_depthInput = nullptr;
}

void CompositorOperation::executeRegion(rcti *rect, unsigned int /*tileNumber*/)
{
  float color[8];  // 7 is enough
  float *buffer = this->m_outputBuffer;
  float *zbuffer = this->m_depthBuffer;

  if (!buffer) {
    return;
  }
  int x1 = rect->xmin;
  int y1 = rect->ymin;
  int x2 = rect->xmax;
  int y2 = rect->ymax;
  int offset = (y1 * this->getWidth() + x1);
  int add = (this->getWidth() - (x2 - x1));
  int offset4 = offset * COM_DATA_TYPE_COLOR_CHANNELS;
  int x;
  int y;
  bool breaked = false;
  int dx = 0, dy = 0;

#if 0
  const RenderData *rd = this->m_rd;

  if (rd->mode & R_BORDER && rd->mode & R_CROP) {
    /**
     * When using cropped render result, need to re-position area of interest,
     * so it'll natch bounds of render border within frame. By default, canvas
     * will be centered between full frame and cropped frame, so we use such
     * scheme to map cropped coordinates to full-frame coordinates
     *
     * ^ Y
     * |                      Width
     * +------------------------------------------------+
     * |                                                |
     * |                                                |
     * |  Centered canvas, we map coordinate from it    |
     * |              +------------------+              |
     * |              |                  |              |  H
     * |              |                  |              |  e
     * |  +------------------+ . Center  |              |  i
     * |  |           |      |           |              |  g
     * |  |           |      |           |              |  h
     * |  |....dx.... +------|-----------+              |  t
     * |  |           . dy   |                          |
     * |  +------------------+                          |
     * |  Render border, we map coordinates to it       |
     * |                                                |    X
     * +------------------------------------------------+---->
     *                      Full frame
     */

    int full_width = rd->xsch * rd->size / 100;
    int full_height = rd->ysch * rd->size / 100;

    dx = rd->border.xmin * full_width - (full_width - this->getWidth()) / 2.0f;
    dy = rd->border.ymin * full_height - (full_height - this->getHeight()) / 2.0f;
  }
#endif

  for (y = y1; y < y2 && (!breaked); y++) {
    for (x = x1; x < x2 && (!breaked); x++) {
      int input_x = x + dx, input_y = y + dy;

      this->m_imageInput->readSampled(color, input_x, input_y, PixelSampler::Nearest);
      if (this->m_useAlphaInput) {
        this->m_alphaInput->readSampled(&(color[3]), input_x, input_y, PixelSampler::Nearest);
      }

      copy_v4_v4(buffer + offset4, color);

      this->m_depthInput->readSampled(color, input_x, input_y, PixelSampler::Nearest);
      zbuffer[offset] = color[0];
      offset4 += COM_DATA_TYPE_COLOR_CHANNELS;
      offset++;
      if (isBraked()) {
        breaked = true;
      }
    }
    offset += add;
    offset4 += add * COM_DATA_TYPE_COLOR_CHANNELS;
  }
}

void CompositorOperation::update_memory_buffer_partial(MemoryBuffer *UNUSED(output),
                                                       const rcti &area,
                                                       Span<MemoryBuffer *> inputs)
{
  if (!m_outputBuffer) {
    return;
  }
  MemoryBuffer output_buf(m_outputBuffer, COM_DATA_TYPE_COLOR_CHANNELS, getWidth(), getHeight());
  output_buf.copy_from(inputs[0], area);
  if (this->m_useAlphaInput) {
    output_buf.copy_from(inputs[1], area, 0, COM_DATA_TYPE_VALUE_CHANNELS, 3);
  }
  MemoryBuffer depth_buf(m_depthBuffer, COM_DATA_TYPE_VALUE_CHANNELS, getWidth(), getHeight());
  depth_buf.copy_from(inputs[2], area);
}

void CompositorOperation::determineResolution(unsigned int resolution[2],
                                              unsigned int preferredResolution[2])
{
  int width = this->m_rd->xsch * this->m_rd->size / 100;
  int height = this->m_rd->ysch * this->m_rd->size / 100;

  // check actual render resolution with cropping it may differ with cropped border.rendering
  // FIX for: [31777] Border Crop gives black (easy)
  Render *re = RE_GetSceneRender(this->m_scene);
  if (re) {
    RenderResult *rr = RE_AcquireResultRead(re);
    if (rr) {
      width = rr->rectx;
      height = rr->recty;
    }
    RE_ReleaseResult(re);
  }

  preferredResolution[0] = width;
  preferredResolution[1] = height;

  NodeOperation::determineResolution(resolution, preferredResolution);

  resolution[0] = width;
  resolution[1] = height;
}

}  // namespace blender::compositor