making lighting inside a cube and reflecting the image

i'm trying to make the light shine inside my cube and reflect the image on the bottom of my cube,i am trying to make this work but it seems i keep failing what exactly am i supposed to do,may some one explain to me,what i should add to this code below

 void drawScene() {
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
     
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
     
     glTranslatef(0.0f, 0.0f, -40.0f);
     glRotatef(30, 1, 0, 0);
     
     GLfloat ambientLight[] = {0.3f, 0.3f, 0.3f, 1.0f};
     glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambientLight);
     
     GLfloat lightColor[] = {0.7f, 0.7f, 0.7f, 1.0f};
     GLfloat lightPos[] = {-2 * BOX_SIZE, BOX_SIZE, 4 * BOX_SIZE, 1.0f};
     glLightfv(GL_LIGHT0, GL_DIFFUSE, lightColor);
     glLightfv(GL_LIGHT0, GL_POSITION, lightPos);
     
     glPushMatrix();
     glTranslatef(0, BOX_HEIGHT, 0);
     drawCube(_textureId, _angle);
     glPopMatrix();
     
     glEnable(GL_STENCIL_TEST); //Enable using the stencil buffer
     glColorMask(0, 0, 0, 0); //Disable drawing colors to the screen
     glDisable(GL_DEPTH_TEST); //Disable depth testing
     glStencilFunc(GL_ALWAYS, 1, 1); //Make the stencil test always pass
     //Make pixels in the stencil buffer be set to 1 when the stencil test passes
     glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
     //Set all of the pixels covered by the floor to be 1 in the stencil buffer
     drawFloor(_textureId);
     
     glColorMask(1, 1, 1, 1); //Enable drawing colors to the screen
     glEnable(GL_DEPTH_TEST); //Enable depth testing
     //Make the stencil test pass only when the pixel is 1 in the stencil buffer
     glStencilFunc(GL_EQUAL, 1, 1);
     glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); //Make the stencil buffer not change
     
     //Draw the cube, reflected vertically, at all pixels where the stencil
     //buffer is 1
     glPushMatrix();
     glScalef(1, -1, 1);
     glTranslatef(0, BOX_HEIGHT, 0);
     drawCube(_textureId, _angle);
     glPopMatrix();
     
     glDisable(GL_STENCIL_TEST); //Disable using the stencil buffer
     
     //Blend the floor onto the screen
     glEnable(GL_BLEND);
     glColor4f(1, 1, 1, 0.7f);
     drawFloor(_textureId);
     glDisable(GL_BLEND);
     
     glutSwapBuffers();
 }

and my cube code is this one below

 void drawCube(int textureId, float angle) {
     glDisable(GL_TEXTURE_2D);
     
     glPushMatrix();
      glRotatef( rotate_x, 1.0, 0.0, 0.0 );
   glRotatef( rotate_y, 0.0, 1.0, 0.0 );
 
     
     glBegin(GL_QUADS);
     
 
     //Bottom face
     glColor3f(1.0f, 0.0f, 1.0f);
     glNormal3f(0.0, -1.0f, 0.0f);
     glVertex3f(-BOX_SIZE / 2, -BOX_SIZE / 2, -BOX_SIZE / 2);
     glVertex3f(BOX_SIZE / 2, -BOX_SIZE / 2, -BOX_SIZE / 2);
     glVertex3f(BOX_SIZE / 2, -BOX_SIZE / 2, BOX_SIZE / 2);
     glVertex3f(-BOX_SIZE / 2, -BOX_SIZE / 2, BOX_SIZE / 2);
     
     //Left face
 /*    
     //Right face
     glNormal3f(1.0, 0.0f, 0.0f);
     glColor3f(1.0f, 0.0f, 0.0f);
     glVertex3f(BOX_SIZE / 2, -BOX_SIZE / 2, -BOX_SIZE / 2);
     glVertex3f(BOX_SIZE / 2, BOX_SIZE / 2, -BOX_SIZE / 2);
     glColor3f(0.0f, 1.0f, 0.0f);
     glVertex3f(BOX_SIZE / 2, BOX_SIZE / 2, BOX_SIZE / 2);
     glVertex3f(BOX_SIZE / 2, -BOX_SIZE / 2, BOX_SIZE / 2);
     */
     glEnd();
     glEnable(GL_TEXTURE_2D);
     glBindTexture(GL_TEXTURE_2D, textureId);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
     glColor3f(1.0f, 1.0f, 1.0f);
     glBegin(GL_QUADS);
     
     //Front face
     glNormal3f(0.0, 0.0f, 1.0f);
     glTexCoord2f(0.0f, 0.0f);
     glVertex3f(-BOX_SIZE / 2, -BOX_SIZE / 2, BOX_SIZE / 2);
     glTexCoord2f(1.0f, 0.0f);
     glVertex3f(BOX_SIZE / 2, -BOX_SIZE / 2, BOX_SIZE / 2);
     glTexCoord2f(1.0f, 1.0f);
     glVertex3f(BOX_SIZE / 2, BOX_SIZE / 2, BOX_SIZE / 2);
     glTexCoord2f(0.0f, 1.0f);
     glVertex3f(-BOX_SIZE / 2, BOX_SIZE / 2, BOX_SIZE / 2);
 
     glNormal3f(-1.0, 0.0f, 0.0f);
     glTexCoord2f(0.0f, 0.0f);
     glVertex3f(-BOX_SIZE / 2, -BOX_SIZE / 2, -BOX_SIZE / 2);
     glTexCoord2f(1.0f, 0.0f);
     glVertex3f(-BOX_SIZE / 2, -BOX_SIZE / 2, BOX_SIZE / 2);
     glTexCoord2f(1.0f, 0.0f);
     glVertex3f(-BOX_SIZE / 2, BOX_SIZE / 2, BOX_SIZE / 2);
     glTexCoord2f(1.0f, 0.0f);
     glVertex3f(-BOX_SIZE / 2, BOX_SIZE / 2, -BOX_SIZE / 2);
     
     
     //Back face
     glNormal3f(0.0, 0.0f, -1.0f);
     glTexCoord2f(0.0f, 0.0f);
     glVertex3f(-BOX_SIZE / 2, -BOX_SIZE / 2, -BOX_SIZE / 2);
     glTexCoord2f(1.0f, 0.0f);
     glVertex3f(-BOX_SIZE / 2, BOX_SIZE / 2, -BOX_SIZE / 2);
     glTexCoord2f(1.0f, 1.0f);
     glVertex3f(BOX_SIZE / 2, BOX_SIZE / 2, -BOX_SIZE / 2);
     glTexCoord2f(0.0f, 1.0f);
     glVertex3f(BOX_SIZE / 2, -BOX_SIZE / 2, -BOX_SIZE / 2);
     
     glEnd();
     
     glPopMatrix();
 }