#include "consts.h"
#include "raylib.h"
#include "raymath.h"
#include <math.h>
#include <stdio.h>

#include "../data/cube.png.h"

#if defined(PLATFORM_WEB)
#include <emscripten/emscripten.h>
#endif

#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))

void MainLoop();

RenderTexture2D target;

Image texImg;
Texture2D texture;

Camera3D cam;
Model cube;

int main(void) {
  SetConfigFlags(FLAG_WINDOW_RESIZABLE | FLAG_VSYNC_HINT);
  InitWindow(WIN_WIDTH, WIN_HEIGHT, "game");
  SetTargetFPS(60);
  SetExitKey(KEY_BACKSPACE);

  target = LoadRenderTexture(SCREEN_WIDTH, SCREEN_HEIGHT);
  SetTextureFilter(target.texture, TEXTURE_FILTER_POINT);

  texImg = LoadImageFromMemory(".png", cube_png, cube_png_len);
  texture = LoadTextureFromImage(texImg);

  cam = (Camera3D){0};
  cam.position = (Vector3){0.0f, 0.0f, sqrtf(3.0f)};
  cam.target = (Vector3){0.0f, 0.0f, 0.0f};
  cam.up = (Vector3){0.0f, 1.0f, 0.0f};
  cam.fovy = 60.0f;
  cam.projection = CAMERA_PERSPECTIVE;

  cube = LoadModelFromMesh(GenMeshCube(1.0f, 1.0f, 1.0f));
  cube.materials[0].maps[MATERIAL_MAP_ALBEDO].texture = texture;

#if defined(PLATFORM_WEB)
  emscripten_set_main_loop(MainLoop, 0, 1);
#else
  while (!WindowShouldClose())
    MainLoop();
#endif
  CloseWindow();

  return 0;
}

void MainLoop() {
  int winWidth = GetScreenWidth(), winHeight = GetScreenHeight();
  float scale =
      MIN((float)winWidth / SCREEN_WIDTH, (float)winHeight / SCREEN_HEIGHT);

  cube.transform =
      MatrixMultiply(MatrixRotateXYZ(Vector3Scale((Vector3){1.0f, 1.5f, 2.5f},
                                                  GetFrameTime())),
                     cube.transform);

  BeginTextureMode(target);
  {
    ClearBackground(BLACK);
    DrawCircleV((Vector2){160.0f, 120.0f}, 120.0f, WHITE);
    BeginMode3D(cam);
    {
      DrawModel(cube, Vector3Zero(), 1.0f, WHITE);
    }
    EndMode3D();
  }
  EndTextureMode();

  BeginDrawing();
  {
    ClearBackground(BLACK);
    DrawTexturePro(
        target.texture,
        (Rectangle){0.0f, 0.0f, (float)SCREEN_WIDTH, (float)-SCREEN_HEIGHT},
        (Rectangle){(winWidth - ((float)SCREEN_WIDTH * scale)) * 0.5f,
                    (winHeight - ((float)SCREEN_HEIGHT * scale)) * 0.5f,
                    (float)SCREEN_WIDTH * scale, (float)SCREEN_HEIGHT * scale},
        (Vector2){0, 0}, 0.0f, WHITE);
  }
  EndDrawing();
}