/**
 * Copyright (c) 2025 Dominic Masters
 * 
 * This software is released under the MIT License.
 * https://opensource.org/licenses/MIT
 */

#include "dusksdl2input.h"
#include "render.h"
#include "renderbackbuffer.h"
#include "display/scene/renderscene.h"
#include "display/spritebatch/spritebatch.h"
#include "display/ui/renderui.h"

SDL_Window *RENDER_WINDOW;
SDL_GLContext RENDER_GL_CONTEXT;
bool_t RENDER_RUNNING;

errorret_t renderInit(void) {
  // Init SDL 
  uint32_t flags = SDL_INIT_VIDEO;
  #if INPUT_SUPPORT_GAMEPAD
    flags |= SDL_INIT_GAMECONTROLLER;
  #endif

  if(SDL_Init(flags) != 0) {
    errorThrow(
      "SDL Failed to Initialize: %s",
      SDL_GetError()
    );
  }

  // Set OpenGL attributes (Needs to be done now or later?)
  SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

  // Create window with OpenGL flag.
  RENDER_WINDOW = SDL_CreateWindow(
    "DuskSDL2",
    SDL_WINDOWPOS_UNDEFINED,
    SDL_WINDOWPOS_UNDEFINED,
    RENDER_WINDOW_WIDTH_DEFAULT,
    RENDER_WINDOW_HEIGHT_DEFAULT,
    SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI |
    SDL_WINDOW_OPENGL
  );
  if(!RENDER_WINDOW) {
    errorThrow("SDL_CreateWindow failed: %s", SDL_GetError());
  }

  // Create OpenGL context
  RENDER_GL_CONTEXT = SDL_GL_CreateContext(RENDER_WINDOW);
  if(!RENDER_GL_CONTEXT) {
    errorThrow("SDL_GL_CreateContext failed: %s", SDL_GetError());
  }

  SDL_GL_SetSwapInterval(1);
  glDisable(GL_DEPTH_TEST);
  glDisable(GL_CULL_FACE);
  glDisable(GL_LIGHTING);// PSP defaults this on?
  glShadeModel(GL_SMOOTH); // Fixes color on PSP?
  glEnable(GL_BLEND);
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

  glEnableClientState(GL_COLOR_ARRAY);// To confirm: every frame on PSP?
  glEnableClientState(GL_TEXTURE_COORD_ARRAY);
  glEnableClientState(GL_VERTEX_ARRAY);

  spriteBatchInit();
  renderBackBufferInit();
  renderSceneInit();
  renderUIInit();

  RENDER_RUNNING = true;
  errorOk();
}

errorret_t renderDraw(void) {
  SDL_Event event;
  while(SDL_PollEvent(&event)) {
    switch(event.type) {
      case SDL_QUIT:
        RENDER_RUNNING = false;
        break;

      default:
        break;
    } 
  }

  // Reset the state
  spriteBatchClear();
  renderBackBufferBind();

  renderSceneDraw();
  renderUIDraw();

  // Finish rendering, now render back buffer.
  renderBackBufferUnbind();
  renderBackBufferDraw();
  textureBind(NULL);

  SDL_GL_SwapWindow(RENDER_WINDOW);
  errorOk();
}

errorret_t renderDispose(void) {
  renderUIDispose();
  renderSceneDispose();
  renderBackBufferDispose();
  spriteBatchDispose();

  // Destroy OpenGL context
  SDL_GL_DeleteContext(RENDER_GL_CONTEXT);
  SDL_DestroyWindow(RENDER_WINDOW);
  SDL_Quit();

  errorOk();
}