#include <iostream>
#include <cstdlib>
#include <pnglite.h>

#include "pheromone.hpp"

PheromoneMap::PheromoneMap(const char * file_name) {
  load_map(file_name);
  sem_init(&map_semaphore, 0, 1);
  tex_created = false;
}

PheromoneMap::~PheromoneMap() {
  free(data);
  sem_destroy(&map_semaphore);

  if(tex_created) {
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, handle);
    glDeleteTextures(1, &handle);
  }
}

void PheromoneMap::load_map(const char * file_name) {
  png_t tex;

  png_init(0, 0);
  png_open_file_read(&tex, file_name);
  data = (unsigned char*) malloc(tex.width * tex.height * tex.bpp);
  png_get_data(&tex, data);

  std::cout << "Loaded map \"" << file_name << "\" :: " << tex.width << "x" << tex.height << "x" << (int)tex.bpp << std::endl;
  m_width  = tex.width;
  m_height = tex.height;
  m_bpp    = tex.bpp;
  
  png_close_file(&tex);
}

GLuint PheromoneMap::s_build_texture() {
  sem_wait(&map_semaphore); {
    if(tex_created) {
      glActiveTexture(GL_TEXTURE0);
      glBindTexture(GL_TEXTURE_2D, handle);
      glDeleteTextures(1, &handle);
    }
    
    glGenTextures(1, &handle);
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, handle);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, m_width, m_height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    tex_created = true;
  } sem_post(&map_semaphore);

  return handle;
}