/* ============== Includes ============== */

# include <stdio.h>

/* ============ Definitions ============= */

# define HELP_SCREEN_SIZE 20
# define MAX_HELP_LINES 9
# define MAX_FLAG_VALUE 16
typedef enum { False=0, True=1 } BOOLEAN; 


/* ======== Function Prototypes ========= */

void   PrintHelpScreen(void);



/* ============== Functions ============= */


void 
PrintHelpScreen(void)
{
    int line;
    
    char *HelpScreen[MAX_HELP_LINES] = {
    "---------------------------------------------",
    "QFdecode  Decodes UVI KPGS gap flag values",
    "",
    "Usage:    GAPdecode flag" ,
    "",
    "Params:   flag -> Gap Flag from UVI KPGS",
    "",
    "Examples: GAPdecode 10",
    "---------------------------------------------"
};

    for (line=0; line < MAX_HELP_LINES; )
    {
	printf("%s\n", HelpScreen[line++]);
	if ( !(line % HELP_SCREEN_SIZE) )
	{
            printf("Press ENTER to continue: ");
            getchar();
	} 
    }

} /* PrintHelpScreen */ 



int 
main( int argc, char *argv[] )
{

	int i;
        int GAPcode=-1;

        /* check for input arguments */
        if(argc < 2) {
           PrintHelpScreen();                    
           exit(1);
        }

        sscanf(argv[1],"%d", &GAPcode);

        printf("\nGap Flag: %d\n\n",GAPcode);

        if(GAPcode == 0) {
           printf("No gap condition was flagged.\n");
        } else {

          switch (GAPcode)
          {
            case 1:
              printf("UVI in wrong mode.\n");
              break;
            case 2:
              printf("Missing data.\n");
              break;
            case 3:
              printf("Data too noisy to process.\n");
              break;
            case 10:
              printf("UVI HVPS not enabled.\n");
              break;
            case 11:
              printf("UVI gain set to zero.\n");
              break;
            case 12:
              printf("Desired image was missing frame 1 hsk.\n");
              break;
            case 13:
              printf("UVI KPGS was unable to find telemetry sync.\n");
              break;
            case 14:
              printf("No background images were available\n");
              break;
            case 15:
              printf("Desired image was not present.\n");
              break;
            case 16:
              printf("Spacecraft was at low altitudes.\n");
              break;
            case 17:
              printf("Despun platform was pointed away from the earth.\n");
              break;
            case 18:
              printf("Data was outside processing time period.\n");
              break;
            case 19:
              printf("Unknown cause for gap.\n");
              break;
            default:
              printf("UNDEFINED GAP EVENT.\n");
              break;
          }

        }

        printf("\n");
} /* main */