/**
 * \file
 * 
 * \author Marko Viitanen ( fador@iki.fi ),
 *         Tampere University of Technology,
 *         Department of Pervasive Computing.
 * \author Ari Koivula ( ari@koivu.la ),
 *         Tampere University of Technology,
 *         Department of Pervasive Computing.
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


/**
 * \brief Allocate memory for config object
 * \return pointer to allocated memory
 */
config *config_alloc()
{
  config *cfg = (config *)malloc(sizeof(config));
  memset(cfg, 0, sizeof(config));
  return cfg;
}

/**
 * \brief Initialize config structure
 * \param cfg config object
 * \return 1 on success, 0 on failure
 */
int config_init(config *cfg)
{  
  cfg->input  = NULL;
  cfg->output = NULL;
  cfg->debug  = NULL;
  cfg->frames = 0;
  cfg->width  = 320;
  cfg->height = 240;

  return 1;
}

/**
 * \brief Free memory allocated to the config
 * \param cfg config object
 * \return 1 on success, 0 on failure
 */
int config_destroy(config *cfg)
{
  FREE_POINTER(cfg->input);
  FREE_POINTER(cfg->output);
  free(cfg);

  return 1;
}

/**
 * \brief Read configuration options from argv to the config struct
 * \param cfg config object
 * \param argc argument count
 * \param argv argument list
 * \return 1 on success, 0 on failure
 */
int config_read(config *cfg,int argc, char *argv[])
{
  uint32_t pos = 0;
  int arg = 1;
  char option = 0;
  
  while(arg < argc && pos < strlen(argv[arg])) {
    // Check for an option
    if(argv[arg][0] == '-' && strlen(argv[arg]) > 1) {
      // Second letter of the argument is the option we want to use
      option = argv[arg][1];
      
      // Point to the next argument
      arg++;
      switch(option) {
        case 'i': // Input
          // Allocate +1 for \0
          cfg->input = (char *)malloc(strlen(argv[arg]) + 1);
          memcpy(cfg->input, argv[arg], strlen(argv[arg]) + 1);
          break;
        case 'o': // Output
          cfg->output = (char *)malloc(strlen(argv[arg]) + 1);
          memcpy(cfg->output, argv[arg], strlen(argv[arg]) + 1);
          break;
        case 'd': // Debug
          cfg->debug = (char *)malloc(strlen(argv[arg]) + 1);
          memcpy(cfg->debug, argv[arg], strlen(argv[arg]) + 1);
          break;
        case 'w': // width
          cfg->width = atoi(argv[arg]);
          break;
        case 'h': // height
          cfg->height = atoi(argv[arg]);
          break;
        case 'n': // number of frames to encode
          cfg->frames = atoi(argv[arg]);
          break;
        default:
          // Unknown command, print error message and ignore
          fprintf(stderr, "%c is not a known option\r\n", option);
          break;
      }
    }
    // Next argument
    arg++;
  }
  
  // Check that the required files were defined
  if(cfg->input == NULL || cfg->output == NULL) return 0;  
  
  return 1;
}