/**
 * Copyright (c) 2026 Dominic Masters
 *
 * This software is released under the MIT License.
 * https://opensource.org/licenses/MIT
 */

#include "display/displaysat.h"
#include "display/render/rendersat.h"
#include "display/display.h"
#include "assert/assert.h"
#include "log/log.h"
#include <vdp1/cmdt.h>
#include <vdp2/cram.h>
#include <vdp2/tvmd.h>
#include <vdp2/scrn.h>
#include <vdp2/vram.h>

errorret_t displaySaturnInit(void) {
  logDebug("[Saturn] displaySaturnInit: start\n");
  DISPLAY.whichBuffer = 0;

  /*
   * TV mode: NTSC, 320×224, non-interlaced.
   * Yaul's vdp2_tvmd_display_res_set() configures the sync standard and
   * horizontal/vertical resolution.
   *
   * TODO: replace with the Yaul typed call when integrating the full SDK:
   *   vdp2_tvmd_display_res_set(VDP2_TVMD_INTERLACE_NONE,
   *                              VDP2_TVMD_HORZ_NORMAL_A,
   *                              VDP2_TVMD_VERT_224);
   *   vdp2_tvmd_display_set();
   */

  /*
   * VDP2 scroll planes: disable all NBG/RBG planes for now; game content is
   * drawn entirely via VDP1 sprites.  Tilemap chunks will re-enable NBG0
   * when the VDP2 tilemap backend is implemented.
   *
   * TODO:
   *   vdp2_scrn_display_set(VDP2_SCRN_DISP_NBG0, false);
   *   vdp2_scrn_display_set(VDP2_SCRN_DISP_NBG1, false);
   *   ...
   */

  /*
   * VDP1 initialisation: the hardware starts drawing from VRAM offset 0.
   * We place our command table there and texture data afterward.
   *
   * TODO:
   *   vdp1_vram_partitions_set(
   *     VDP1_VRAM_CYCP_...,   // cycle patterns
   *     ...
   *   );
   */

  logDebug("[Saturn] displaySaturnInit: calling renderSaturnInit\n");
  errorChain(renderSaturnInit());

  logDebug("[Saturn] displaySaturnInit: done\n");
  errorOk();
}

errorret_t displaySaturnFlush(ropbuffer_t *buf) {
  assertNotNull(buf, "Saturn flush: null ropbuffer");
  errorChain(renderSaturnFlush(buf));
  errorOk();
}

errorret_t displaySaturnSwap(void) {
  logDebug("[Saturn] displaySaturnSwap\n");
  /*
   * Wait for VDP1 to finish rendering the current frame then swap buffers.
   *
   * TODO:
   *   vdp1_sync_render();
   *   vdp1_sync();
   *   vdp2_sync();
   *   vdp2_sync_wait();
   */
  DISPLAY.whichBuffer ^= 1;
  errorOk();
}

void displaySaturnDispose(void) {
  logDebug("[Saturn] displaySaturnDispose\n");
  renderSaturnDispose();
}