#include <stdio.h>
//for use of exit()
#include <stdlib.h>
//for use of libconfig
#include <libconfig.h>

int main(int argc, char *argv[]) {
  fprintf(stdout,"main() Started...\n");

  /*read command line*/
  if (argc > 1){
    printf("main() argv[1]: %s\n", argv[1]);
  }else{
    fprintf(stderr, "Usage: %s <path to config file>\n", argv[0]);
    exit(1);
  }

  config_t cfg;
  config_setting_t *setting;
  const char *str;

  /*initialise new and EMPTY config*/
  config_init(&cfg);

  /* Read the file. If there is an error, report it and exit. */
  if(! config_read_file(&cfg, argv[1]))
  {
    fprintf(stderr, "%s:%d - %s\n", config_error_file(&cfg),
            config_error_line(&cfg), config_error_text(&cfg));
    /*destroy config, BUT NOT the structure*/
    config_destroy(&cfg);
    return(EXIT_FAILURE);
  }

  /* Get the store name. */
  if(config_lookup_string(&cfg, "name", &str))
    printf("Store name: %s\n\n", str);
  else
    fprintf(stderr, "No 'name' setting in configuration file.\n");

  /* Output a list of all books in the inventory. */
  setting = config_lookup(&cfg, "inventory.books");
  if(setting != NULL)
  {
    int count = config_setting_length(setting);
    fprintf(stdout, "count: %d\n", count);
    int i;

    printf("%-30s  %-30s   %-6s  %s\n", "TITLE", "AUTHOR", "PRICE", "QTY");

    for(i = 0; i < count; ++i)
    {
      config_setting_t *book = config_setting_get_elem(setting, i);

      /* Only output the record if all of the expected fields are present. */
      const char *title, *author;
      double price;
      int qty;

      if(!(config_setting_lookup_string(book, "title", &title)
           && config_setting_lookup_string(book, "author", &author)
           && config_setting_lookup_float(book, "price", &price)
           && config_setting_lookup_int(book, "qty", &qty)))
        continue;

      printf("%-30s  %-30s  $%6.2f  %3d\n", title, author, price, qty);
    }
    putchar('\n');
  }

  /* Output a list of all movies in the inventory. */
  setting = config_lookup(&cfg, "inventory.movies");
  if(setting != NULL)
  {
    unsigned int count = config_setting_length(setting);
    fprintf(stdout, "count: %d\n", count);
    unsigned int i;

    printf("%-30s  %-10s   %-6s  %s\n", "TITLE", "MEDIA", "PRICE", "QTY");
    for(i = 0; i < count; ++i)
    {
      config_setting_t *movie = config_setting_get_elem(setting, i);

      /* Only output the record if all of the expected fields are present. */
      const char *title, *media;
      double price;
      int qty;

      if(!(config_setting_lookup_string(movie, "title", &title)
           && config_setting_lookup_string(movie, "media", &media)
           && config_setting_lookup_float(movie, "price", &price)
           && config_setting_lookup_int(movie, "qty", &qty)))
        continue;

      printf("%-30s  %-10s  $%6.2f  %3d\n", title, media, price, qty);
    }
    putchar('\n');
  }

  config_destroy(&cfg);
  fprintf(stdout,"main() Done.\n");
  return(EXIT_SUCCESS);
}