#include "Renderer.h"
#include <GL/gl.h>


void Renderer::drawGrid(const Rectangle &rect, float scale) {
  float depth = log10f(scale)-0.75f;
  float depth2 = floorf(depth);
  float step = powf(0.1f, depth2);
  float f;
  int i;
  //gchar *string;
  float x1 = rect.getVertex1().getX(), y1 = rect.getVertex1().getY();
  float x2 = rect.getVertex2().getX(), y2 = rect.getVertex2().getY();
  
  
  glBegin(GL_LINES);
  //cairo_set_font_size(cr, 10.0/scale);
  
  for(i = 0; 0.4f*(depth-depth2+i-1) < 0.5f; i++) {
    f = fminf(0.4f*(depth-depth2+i), 0.5f);
    glColor3f(f, f, f);
    
    for(f = x1 - fmodf(x1, step) - step; f <= x2; f+=step) {
      glVertex2f(f, y1);
      glVertex2f(f, y2);
      
      /*if(step > 0.005) {
          if(step > 0.5)
            string = g_strdup_printf("%i", (int)rint(d));
          else
            string = g_strdup_printf("%.*f", -(int)floor(log10(step*1.1)), d+step/10);
          
          cairo_move_to(cr, d+1/scale, y1+11/scale);
          cairo_show_text(cr, string);
          
          g_free(string);
        }*/
    }
    
    for(f = y1 - fmodf(y1, step) - step; f <= y2; f+=step) {
      glVertex2f(x1, f);
      glVertex2f(x2, f);
      
      /*if(step > 0.005) {
          if(step > 0.5)
            string = g_strdup_printf("%i", (int)rint(d));
          else
            string = g_strdup_printf("%.*f", -(int)floor(log10(step*1.1)), d+step/10);
          
          cairo_move_to(cr, x1+3/scale, d+11/scale);
          cairo_show_text(cr, string);
          
          g_free(string);
        }*/
    }
    
    step *= 10;
  }
  
  glEnd();
}

void Renderer::fillPolygon(const Polygon &polygon) {
  std::vector<Triangle> triangles;
  
  polygon.triangulate(triangles);
  
  glBegin(GL_TRIANGLES);
  
  for(std::vector<Triangle>::iterator t = triangles.begin(); t != triangles.end(); t++) {
    glVertex2f(t->getVertexA().getX(), t->getVertexA().getY());
    glVertex2f(t->getVertexB().getX(), t->getVertexB().getY());
    glVertex2f(t->getVertexC().getX(), t->getVertexC().getY());
  }
  
  glEnd();
}

void Renderer::drawPolygon(const Polygon &polygon, bool close) {
  glBegin(GL_LINE_STRIP);
  
  for(Polygon::const_iterator vertex = polygon.begin(); vertex != polygon.end(); vertex++)
    glVertex2d(vertex->getX(), vertex->getY());
  
  if(close)
    glVertex2d(polygon.front().getX(), polygon.front().getY());
  
  glEnd();
}

void Renderer::render(const Level &level, const Rectangle &rect, float scale) {
  glClear(GL_COLOR_BUFFER_BIT);
  
  glLineWidth(1.0f);
  
  drawGrid(rect, scale);
  
  for(Level::const_iterator room = level.begin(); room != level.end(); room++) {
    if(&*room == editManager->getActiveRoom() && editManager->getMode() == EditManager::ADD) continue;
    
    if(&*room == editManager->getActiveRoom())
      glColor4f(0.0f, 0.7f, 1.0f, 0.2f);
    else
      glColor4f(0.0f, 0.7f, 1.0f, 0.3f);
    
    fillPolygon(*room);
    
    if(&*room == editManager->getActiveRoom()) {
      glColor4f(1.0f, 1.0f, 1.0f, 0.9f);
      glLineWidth(2.0f);
    }
    else if(&*room == editManager->getHoveredRoom() && editManager->getMode() == EditManager::VIEW) {
      glColor4f(0.0f, 0.7f, 1.0f, 0.7f);
      glLineWidth(2.0f);
    }
    else {
      glColor4f(0.0f, 0.7f, 1.0f, 0.7f);
      glLineWidth(1.0f);
    }
    
    drawPolygon(*room, true);
  }
  
  if(editManager->getMode() == EditManager::ADD) {
    if(editManager->polygonOk(*editManager->getActiveRoom()))
      glColor4f(0.0f, 0.7f, 1.0f, 0.2f);
    else
      glColor4f(1.0f, 0.3f, 0.3f, 0.2f);
    
    fillPolygon(*editManager->getActiveRoom());
    
    glLineWidth(2.0f);
    glColor4f(0.0f, 0.7f, 1.0f, 0.7f);
    drawPolygon(*editManager->getActiveRoom(), false);
    
    if(!editManager->getActiveRoom()->empty() && editManager->getHoveredVertex()) {
      if(!editManager->vertexOk(*editManager->getHoveredVertex()))
        glColor4f(1.0f, 0.3f, 0.3f, 0.7f);
      
      glBegin(GL_LINES);
      
      glVertex2d(editManager->getActiveRoom()->back().getX(), editManager->getActiveRoom()->back().getY());
      glVertex2d(editManager->getHoveredVertex()->getX(), editManager->getHoveredVertex()->getY());
      
      glEnd();
    }
  }
}