Cuber/Sims/OOPCube.hpp

#pragma once

#include "../RubixSimulation.hpp"
#include <raylib.h>
#include <raymath.h>
#include <rlgl.h>

namespace OOPCube {

struct VecTriangle {
  Vector3 pointOne;
  Vector3 pointTwo;
  Vector3 pointThree;
};

struct Plane3D {
  VecTriangle one;
  VecTriangle two;
  Color color;
};

struct CubeFace {
  Plane3D tiles[9]; // 3x3 tiles
};

struct CubeRotation {
  bool rotating;
  float angle;
  Vector3 axis;
  CubeFace *face;
};

struct RubixCubeFaces {
  CubeFace front;
  CubeFace right;
  CubeFace back;
  CubeFace left;
  CubeFace top;
  CubeFace bottom;
};

class RubixCube {
public:
  RubixCube() {
    float cubeSize = 3.0f;
    float faceOffset = cubeSize / 2.0f;

    faces.front = CreateCubeFace({0.0f, 0.0f, -faceOffset}, {0.0f, 0.0f, 1.0f},
                                 cubeSize, GREEN);
    faces.back = CreateCubeFace({0.0f, 0.0f, faceOffset}, {0.0f, 0.0f, -1.0f},
                                cubeSize, BLUE);
    faces.left = CreateCubeFace({-faceOffset, 0.0f, 0.0f}, {1.0f, 0.0f, 0.0f},
                                cubeSize, ORANGE);
    faces.right = CreateCubeFace({faceOffset, 0.0f, 0.0f}, {-1.0f, 0.0f, 0.0f},
                                 cubeSize, RED);
    faces.top = CreateCubeFace({0.0f, faceOffset, 0.0f}, {0.0f, -1.0f, 0.0f},
                               cubeSize, YELLOW);
    faces.bottom = CreateCubeFace({0.0f, -faceOffset, 0.0f}, {0.0f, 1.0f, 0.0f},
                                  cubeSize, WHITE);
  }

  void Draw(bool highlightFace = false, CubeFace *highlightedFace = nullptr) {
    if (highlightFace && highlightedFace != nullptr) {
      HighlightFace(highlightedFace);
    }
    DrawFace(&faces.front);
    DrawFace(&faces.back);
    DrawFace(&faces.left);
    DrawFace(&faces.right);
    DrawFace(&faces.top);
    DrawFace(&faces.bottom);
  }

  void RotateFace(CubeFace *face, float angle, Vector3 axis) {
    CubeFace *neighbors[4];                    // Holds adjacent faces
    GetFaceNeighbors(face, neighbors);         // Get adjacent faces
    RotateLayer(face, angle, axis, neighbors); // Rotate both face and neighbors
    UpdateCubeState(face, neighbors,
                    angle > 0); // Update the state after rotation
  }

  CubeFace *GetFaceUnderMouse(Camera camera) {
    Ray mouseRay = GetMouseRay(GetMousePosition(), camera);
    CubeFace *face = nullptr;

    if (CheckRayIntersectionWithFace(mouseRay, faces.front)) {
      face = &faces.front;
    } else if (CheckRayIntersectionWithFace(mouseRay, faces.back)) {
      face = &faces.back;
    } else if (CheckRayIntersectionWithFace(mouseRay, faces.left)) {
      face = &faces.left;
    } else if (CheckRayIntersectionWithFace(mouseRay, faces.right)) {
      face = &faces.right;
    } else if (CheckRayIntersectionWithFace(mouseRay, faces.top)) {
      face = &faces.top;
    } else if (CheckRayIntersectionWithFace(mouseRay, faces.bottom)) {
      face = &faces.bottom;
    }

    return face;
  }

private:
  RubixCubeFaces faces;

  void GetFaceNeighbors(CubeFace *face, CubeFace **neighbors) {
    // Map the neighbors of each face (order: top, right, bottom, left)
    if (face == &faces.front) {
      neighbors[0] = &faces.top;
      neighbors[1] = &faces.right;
      neighbors[2] = &faces.bottom;
      neighbors[3] = &faces.left;
    } else if (face == &faces.back) {
      neighbors[0] = &faces.top;
      neighbors[1] = &faces.left;
      neighbors[2] = &faces.bottom;
      neighbors[3] = &faces.right;
    } else if (face == &faces.left) {
      neighbors[0] = &faces.top;
      neighbors[1] = &faces.front;
      neighbors[2] = &faces.bottom;
      neighbors[3] = &faces.back;
    } else if (face == &faces.right) {
      neighbors[0] = &faces.top;
      neighbors[1] = &faces.back;
      neighbors[2] = &faces.bottom;
      neighbors[3] = &faces.front;
    } else if (face == &faces.top) {
      neighbors[0] = &faces.back;
      neighbors[1] = &faces.right;
      neighbors[2] = &faces.front;
      neighbors[3] = &faces.left;
    } else if (face == &faces.bottom) {
      neighbors[0] = &faces.front;
      neighbors[1] = &faces.right;
      neighbors[2] = &faces.back;
      neighbors[3] = &faces.left;
    }
  }

  void RotateLayer(CubeFace *face, float angle, Vector3 axis,
                   CubeFace **neighbors) {
    // Rotate the face itself
    RotateCubeFace(face, MatrixRotate(axis, angle));
    // Apply rotation to the neighboring rows/columns
    RotateNeighbors(face, angle, neighbors);
  }

  void RotateNeighbors(CubeFace *rotatingFace, float angle,
                       CubeFace **neighbors) {
    // Clockwise or counterclockwise based on angle
    bool clockwise = angle > 0.0f;

    // Determine the layer based on the rotating face.
    // If front/back, rotate the middle horizontal row; otherwise, rotate the
    // vertical columns.
    if (rotatingFace == &faces.front || rotatingFace == &faces.back) {
      // Rotating the front or back face (affects top, right, bottom, and left
      // face)
      UpdateCubeState(rotatingFace, neighbors, clockwise);
    } else if (rotatingFace == &faces.left || rotatingFace == &faces.right) {
      // Rotating left or right face (affects top, front, bottom, and back face)
      UpdateCubeState(rotatingFace, neighbors, clockwise);
    } else if (rotatingFace == &faces.top || rotatingFace == &faces.bottom) {
      // Rotating top or bottom face (affects front, right, back, and left face)
      UpdateCubeState(rotatingFace, neighbors, clockwise);
    }
  }

  void UpdateCubeState(CubeFace *face, CubeFace **neighbors, bool clockwise) {
    // Swapping tiles based on clockwise or counterclockwise rotation

    if (face == &faces.front || face == &faces.back) {
      // Swap rows for front or back face rotation
      if (clockwise) {
        // Rotate clockwise: top->right, right->bottom, bottom->left, left->top
        SwapRows(neighbors[0], neighbors[1], neighbors[2], neighbors[3], 2,
                 true);
      } else {
        // Rotate counter-clockwise: top->left, left->bottom, bottom->right,
        // right->top
        SwapRows(neighbors[0], neighbors[3], neighbors[2], neighbors[1], 2,
                 false);
      }
    } else if (face == &faces.left || face == &faces.right) {
      // Swap columns for left or right face rotation
      if (clockwise) {
        // Rotate clockwise: top->front, front->bottom, bottom->back, back->top
        SwapColumns(neighbors[0], neighbors[1], neighbors[2], neighbors[3], 0,
                    true);
      } else {
        // Rotate counter-clockwise: top->back, back->bottom, bottom->front,
        // front->top
        SwapColumns(neighbors[0], neighbors[3], neighbors[2], neighbors[1], 0,
                    false);
      }
    } else if (face == &faces.top || face == &faces.bottom) {
      // Swap rows for top or bottom face rotation
      if (clockwise) {
        // Rotate clockwise: front->right, right->back, back->left, left->front
        SwapRows(neighbors[0], neighbors[1], neighbors[2], neighbors[3], 0,
                 true);
      } else {
        // Rotate counter-clockwise: front->left, left->back, back->right,
        // right->front
        SwapRows(neighbors[0], neighbors[3], neighbors[2], neighbors[1], 0,
                 false);
      }
    }
  }

  // Helper function to swap rows (used when rotating top/bottom or front/back)
  void SwapRows(CubeFace *top, CubeFace *right, CubeFace *bottom,
                CubeFace *left, int rowIndex, bool clockwise) {
    Plane3D tempRow[3];

    // Store top row temporarily
    for (int i = 0; i < 3; i++) {
      tempRow[i] = top->tiles[rowIndex * 3 + i];
    }

    // Swap rows based on direction
    if (clockwise) {
      // Top -> Right -> Bottom -> Left -> Top
      for (int i = 0; i < 3; i++) {
        top->tiles[rowIndex * 3 + i] = left->tiles[rowIndex * 3 + i];
        left->tiles[rowIndex * 3 + i] = bottom->tiles[rowIndex * 3 + i];
        bottom->tiles[rowIndex * 3 + i] = right->tiles[rowIndex * 3 + i];
        right->tiles[rowIndex * 3 + i] = tempRow[i];
      }
    } else {
      // Top -> Left -> Bottom -> Right -> Top
      for (int i = 0; i < 3; i++) {
        top->tiles[rowIndex * 3 + i] = right->tiles[rowIndex * 3 + i];
        right->tiles[rowIndex * 3 + i] = bottom->tiles[rowIndex * 3 + i];
        bottom->tiles[rowIndex * 3 + i] = left->tiles[rowIndex * 3 + i];
        left->tiles[rowIndex * 3 + i] = tempRow[i];
      }
    }
  }

  void SwapColumns(CubeFace *top, CubeFace *front, CubeFace *bottom,
                   CubeFace *back, int colIndex, bool clockwise) {
    Plane3D tempCol[3];

    // Store top column temporarily
    for (int i = 0; i < 3; i++) {
      tempCol[i] = top->tiles[i * 3 + colIndex];
    }

    // Swap columns based on direction
    if (clockwise) {
      // Top -> Front -> Bottom -> Back -> Top
      for (int i = 0; i < 3; i++) {
        top->tiles[i * 3 + colIndex] = back->tiles[i * 3 + colIndex];
        back->tiles[i * 3 + colIndex] = bottom->tiles[i * 3 + colIndex];
        bottom->tiles[i * 3 + colIndex] = front->tiles[i * 3 + colIndex];
        front->tiles[i * 3 + colIndex] = tempCol[i];
      }
    } else {
      // Top -> Back -> Bottom -> Front -> Top
      for (int i = 0; i < 3; i++) {
        top->tiles[i * 3 + colIndex] = front->tiles[i * 3 + colIndex];
        front->tiles[i * 3 + colIndex] = bottom->tiles[i * 3 + colIndex];
        bottom->tiles[i * 3 + colIndex] = back->tiles[i * 3 + colIndex];
        back->tiles[i * 3 + colIndex] = tempCol[i];
      }
    }
  }

  void RotateCubeFace(CubeFace *face, Matrix rotationMatrix) {
    for (int i = 0; i < 9; i++) {
      RotatePlane3D(&face->tiles[i], rotationMatrix);
    }
  }

  void RotatePlane3D(Plane3D *plane, Matrix rotationMatrix) {
    plane->one.pointOne = Vector3Transform(plane->one.pointOne, rotationMatrix);
    plane->one.pointTwo = Vector3Transform(plane->one.pointTwo, rotationMatrix);
    plane->one.pointThree =
        Vector3Transform(plane->one.pointThree, rotationMatrix);
    plane->two.pointOne = Vector3Transform(plane->two.pointOne, rotationMatrix);
    plane->two.pointTwo = Vector3Transform(plane->two.pointTwo, rotationMatrix);
    plane->two.pointThree =
        Vector3Transform(plane->two.pointThree, rotationMatrix);
  }

  void HighlightFace(CubeFace *face) { DrawFace(face, true); }

  void DrawFace(CubeFace *face, bool highlight = false) {
    Color faceColor = highlight ? LIGHTGRAY : face->tiles[0].color;

    for (int i = 0; i < 9; i++) {
      DrawPlane3D(&face->tiles[i]);
    }
  }

  bool CheckRayIntersectionWithFace(Ray ray, CubeFace face) {
    for (int i = 0; i < 9; i++) {
      if (CheckRayCollision(ray, face.tiles[i])) {
        return true;
      }
    }
    return false;
  }

  bool CheckRayCollision(Ray ray, Plane3D plane) {
    RayCollision collisionOne = GetRayCollisionTriangle(
        ray, plane.one.pointOne, plane.one.pointTwo, plane.one.pointThree);
    RayCollision collisionTwo = GetRayCollisionTriangle(
        ray, plane.two.pointOne, plane.two.pointTwo, plane.two.pointThree);

    return collisionOne.hit || collisionTwo.hit;
  }

  Plane3D CreatePlane3D(float width, float height, Vector3 position,
                        Color color, Vector3 normal, float scale) {
    Plane3D plane3D;
    plane3D.color = color;

    Vector3 right, up;

    if (Vector3Equals(normal, {0.0f, 1.0f, 0.0f}) ||
        Vector3Equals(normal, {0.0f, -1.0f, 0.0f})) {
      right = {1.0f, 0.0f, 0.0f};
      up = {0.0f, 0.0f, (normal.y > 0.0f) ? -1.0f : 1.0f};
    } else {
      right = {normal.z, 0.0f, -normal.x};
      up = {0.0f, 1.0f, 0.0f};
    }

    float scaledWidth = width * scale;
    float scaledHeight = height * scale;

    plane3D.one.pointOne =
        Vector3Add(position, Vector3Add(Vector3Scale(right, -scaledWidth / 2),
                                        Vector3Scale(up, -scaledHeight / 2)));
    plane3D.one.pointTwo =
        Vector3Add(position, Vector3Add(Vector3Scale(right, scaledWidth / 2),
                                        Vector3Scale(up, -scaledHeight / 2)));
    plane3D.one.pointThree =
        Vector3Add(position, Vector3Add(Vector3Scale(right, -scaledWidth / 2),
                                        Vector3Scale(up, scaledHeight / 2)));

    plane3D.two.pointOne =
        Vector3Add(position, Vector3Add(Vector3Scale(right, scaledWidth / 2),
                                        Vector3Scale(up, -scaledHeight / 2)));
    plane3D.two.pointTwo =
        Vector3Add(position, Vector3Add(Vector3Scale(right, scaledWidth / 2),
                                        Vector3Scale(up, scaledHeight / 2)));
    plane3D.two.pointThree =
        Vector3Add(position, Vector3Add(Vector3Scale(right, -scaledWidth / 2),
                                        Vector3Scale(up, scaledHeight / 2)));

    return plane3D;
  }

  CubeFace CreateCubeFace(Vector3 center, Vector3 normal, float cubeSize,
                          Color faceColor) {
    CubeFace face;

    float tileSize = cubeSize / 3.0f;
    float halfSize = cubeSize / 2.0f;

    Vector3 right = Vector3CrossProduct(normal, {0.0f, 1.0f, 0.0f});
    if (Vector3Length(right) == 0) {
      right = {1.0f, 0.0f, 0.0f};
    }

    Vector3 up = Vector3CrossProduct(right, normal);
    Vector3 tileCenters[3][3];

    for (int i = 0; i < 3; i++) {
      for (int j = 0; j < 3; j++) {
        tileCenters[i][j] = Vector3Add(
            center, Vector3Add(Vector3Scale(right, (i - 1) * tileSize),
                               Vector3Scale(up, (j - 1) * tileSize)));
      }
    }

    for (int i = 0; i < 9; i++) {
      face.tiles[i] =
          CreatePlane3D(tileSize, tileSize, tileCenters[i / 3][i % 3],
                        faceColor, normal, 1.0f);
    }

    return face;
  }

  void DrawPlane3D(Plane3D *plane) {
    DrawTriangle3D(plane->one.pointOne, plane->one.pointTwo,
                   plane->one.pointThree, plane->color);
    DrawTriangle3D(plane->two.pointOne, plane->two.pointTwo,
                   plane->two.pointThree, plane->color);
  }
};

class OOPCube : public RubixSimulation {
public:
  bool Init() override {
    camera = {0};
    camera.position = {4.0f, 4.0f, 4.0f};
    camera.target = {0.0f, 0.0f, 0.0f};
    camera.up = {0.0f, 1.0f, 0.0f};
    camera.fovy = 45.0f;
    camera.projection = CAMERA_PERSPECTIVE;

    return true;
  }

  void Run() override {
    SetConfigFlags(FLAG_VSYNC_HINT);
    InitWindow(1920, 1080, "OOP Cube Simulation");

    DisableCursor();
    rlDisableBackfaceCulling();
    bool isControllingCamera = false;

    while (!WindowShouldClose()) {
      if (IsKeyPressed(KEY_SPACE)) {
        isControllingCamera = !isControllingCamera;
      }

      if (isControllingCamera) {
        HideCursor();
        UpdateCamera(&camera, CAMERA_FREE);
        SetMousePosition(GetScreenWidth() / 2, GetScreenHeight() / 2);
      }
      BeginDrawing();
      ClearBackground(GRAY);
      ShowCursor();

      BeginMode3D(camera);
      DrawGrid(10, 1.0f);

      CubeFace *faceUnderMouse = cube.GetFaceUnderMouse(camera);
      if (faceUnderMouse != nullptr) {
        if (IsMouseButtonPressed(MOUSE_LEFT_BUTTON)) {
          cube.RotateFace(faceUnderMouse, PI / 2.0f, {0.0f, 1.0f, 0.0f});
        } else if (IsMouseButtonPressed(MOUSE_RIGHT_BUTTON)) {
          cube.RotateFace(faceUnderMouse, -PI / 2.0f, {0.0f, 1.0f, 0.0f});
        }
        cube.Draw(true, faceUnderMouse);
      } else {
        cube.Draw();
      }

      EndMode3D();

      EndDrawing();
    }
  }

private:
  Camera camera;
  RubixCube cube;
};
} // namespace OOPCube