package de.gamezock.metacraft.ui;

import java.nio.IntBuffer;
import java.util.List;

import javax.media.opengl.GL;
import javax.media.opengl.GL2;

import de.gamezock.metacraft.data.IndexedTriangle;
import de.gamezock.metacraft.data.Map;
import de.gamezock.metacraft.data.Tile;
import de.gamezock.metacraft.data.VertexBuffer;

public class Renderer {
  private Main main;
  
  public Renderer(Main main) {
    this.main = main;
  }
  
  private void renderTile(GL2 gl, Tile tile) {
    List<IndexedTriangle> triangles = tile.getData().getTriangles();
    
    if(triangles.isEmpty())
      return;
    
    VertexBuffer buffer = triangles.get(0).getBuffer();
    
    gl.glInterleavedArrays(GL2.GL_N3F_V3F, 0, buffer.getBuffer().clear());
    
    IntBuffer indexBuffer = tile.getData().getIndexBuffer();
    indexBuffer.clear();
    
    gl.glDrawElements(GL.GL_TRIANGLES, indexBuffer.capacity(), GL2.GL_UNSIGNED_INT, indexBuffer);
  }
  
  public void render(GL2 gl) {
    gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
    
    Map currentMap = main.getCurrentMap();
    
    gl.glEnable(GL2.GL_VERTEX_ARRAY);
    gl.glEnable(GL2.GL_NORMAL_ARRAY);
    
    gl.glPushMatrix();
    gl.glRotatef((System.currentTimeMillis()%9000)/25.0f, 0, 0, 1);
    gl.glTranslatef(-20, -20, 0);
    
    gl.glColor3f(1, 1, 1);
    
    for(int x = 0; x < currentMap.getWidth(); ++x) {
      for(int y = 0; y < currentMap.getHeight(); ++y) {
        gl.glPushMatrix();
        
        gl.glTranslatef(currentMap.getTileSize()*x, currentMap.getTileSize()*y, currentMap.getTileHeight(x, y));
        renderTile(gl, currentMap.getTile(x, y));
        
        gl.glPopMatrix();
      }
    }
    
    gl.glPopMatrix();
  }
}