/********************************************************/
/* Title: Expert system based on House S01E01 		*/
/* Developer: Damian Gordon 				*/
/* Date Created: 01/11/2024				*/
/********************************************************/
/* Description: This is an Expert system to do a 	*/
/* diagnosis based on House S01E01			*/
/********************************************************/
/* Modified by: Developer, Date, Description		*/
/* Modified by: Developer, Date, Description		*/
/* Modified by: Developer, Date, Description		*/
/* Modified by: Developer, Date, Description		*/
/********************************************************/

#include <stdio.h>

int main() {

/****************************************/
/*        VARIABLES			*/
/****************************************/

    /* Declare the variables to record the users' answers */
    char MRI_YN, Thiamine_YN, CAT_Scan_YN;

/****************************************/
/*        GET USER ANSWERS		*/
/****************************************/

    printf("************************************************\n");
    printf("*  Welcome to the HOUSE, S01E01 Expert System  *\n");
    printf("************************************************\n");
    
    /* Check if the MRI showed anything */
    printf("Was there anything on the MRI (y/n): ");
    scanf(" %c", &MRI_YN);
    
    /* Check if the Thiamine Level is elevated */
    printf("Is the Thiamine Level elevated (y/n): ");
    scanf(" %c", &Thiamine_YN);
    
    /* Check if the CAT Scan showed anything */
    printf("Was there anything on the CAT scan (y/n): ");
    scanf(" %c", &CAT_Scan_YN);



/****************************************/
/*        EXPERT SYSTEM			*/
/****************************************/
        
    if ((MRI_YN	        	== 'n') && 
        (Thiamine_YN		== 'n') && 
        (CAT_Scan_YN		== 'n')) {
        printf("==================================\n");
        printf("POSSIBLE DIAGNOSIS: Brain tumour.\n");
        printf("FOLLOW-UP TEST: Do a Contrast MRI.\n");
    }

    else if ((MRI_YN	 	== 'n') && 
             (Thiamine_YN	== 'n') && 
             (CAT_Scan_YN	== 'y')) {
        printf("==================================\n");
        printf("POSSIBLE DIAGNOSIS: Brain lesion.\n");
        printf("FOLLOW-UP TEST: Inject gadolinium.\n");
    }

    else if ((MRI_YN	 	== 'n') && 
             (Thiamine_YN	== 'y') && 
             (CAT_Scan_YN	== 'n')) {
        printf("==================================\n");
        printf("POSSIBLE DIAGNOSIS: Brain aneurysm.\n");
        printf("FOLLOW-UP TEST: Check protein markers.\n");
    }

    else if ((MRI_YN	 	== 'n') && 
             (Thiamine_YN	== 'y') && 
             (CAT_Scan_YN	== 'y')) {
        printf("==================================\n");
        printf("POSSIBLE DIAGNOSIS: Stroke.\n");
        printf("FOLLOW-UP TEST: Check SED rate.\n");
    }

    else if ((MRI_YN	 	== 'y') && 
             (Thiamine_YN	== 'n') && 
             (CAT_Scan_YN	== 'n')) {
        printf("==================================\n");
        printf("POSSIBLE DIAGNOSIS: Ischemic syndrome.\n");
        printf("FOLLOW-UP TEST: Give blood thinners.\n");
    }

    else if ((MRI_YN	 	== 'y') && 
             (Thiamine_YN	== 'n') && 
             (CAT_Scan_YN	== 'y')) {
        printf("==================================\n");
        printf("POSSIBLE DIAGNOSIS: Creutzfeldt–Jakob disease.\n");
        printf("FOLLOW-UP TEST: Test with interferon.\n");
    }

    else if ((MRI_YN	 	== 'y') && 
             (Thiamine_YN	== 'y') && 
             (CAT_Scan_YN	== 'n')) {
        printf("==================================\n");
        printf("POSSIBLE DIAGNOSIS: Wernicke encephalopathy.\n");
        printf("FOLLOW-UP TEST: Change diet.\n");
    }

    else if ((MRI_YN	    	== 'y') && 
             (Thiamine_YN	== 'y') && 
             (CAT_Scan_YN	== 'y')) {
        printf("==================================\n");
        printf("POSSIBLE DIAGNOSIS: Cerebral vasculitus.\n");
        printf("FOLLOW-UP TEST: Use immunosuppressant drugs.\n");
    }

    else {
        printf("Error: Invalid input.\n");
    } //Endif;
    return 0;
} //End.