// included libraries
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
// constants
const char *MONTHS[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", 
                        "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; 
                        //array of months
const int ARRAY_LENGTH = 5;// array length
const int DESC_LENGTH=256;
//------------------------------------------------------------------------------

//structures--------------------------------------------------------------------
struct EventDate {
       int day;
       int month;
       };
       
enum EventType {Birthday, Anniversary};

struct Event {
       EventType type;
       EventDate date;
       char description[DESC_LENGTH];
       };
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
// Function prototypes

FILE *safeOpen(char *fileName, char *mode);
// Purpose:   To safely open a file
// Arguments: the file name of the file to be opened and the mode
// Ret. Val:  a pointer to the input stream
// Pre:       file to be opened must exist           
// Post:      
//------------------------------------------------------------------------------

Event inputEvent(FILE *inputStream);
// Purpose:   To input a single event from the file
// Arguments: the pointer to the input stream
// Ret. Val:  an event structure
// Pre:       array to store the structure must be declared           
// Post:      
//------------------------------------------------------------------------------


//------------------------------------------------------------------------------
//main
int main(int argc, char *argv[]) {
    FILE *inputStream; // creates file pointer
    Event events[ARRAY_LENGTH]; //array to store events
    int arrayIndex = 0; // index for array of dates
	Event tempEvent;// to store event temporarily for swap
	int i,j; // counters
   
    
     //check for correct number of args
    if (argc < 2 ) {
             printf("USAGE: %s <file to get events from> \n", argv[0]);
             exit(1);
    }
 
    inputStream = safeOpen(argv[1], "r");// assign file to inputstream
    
    // store events into array until EOF is reached
    while (!feof(inputStream)) {
           events[arrayIndex] = inputEvent(inputStream);
           arrayIndex++;
           fscanf(inputStream, " ");
          
        }// end of while loop
   
    // bubble sort algorithm
    for (i=0; i < ARRAY_LENGTH; i++) { 
        
        for (j=0; j < ARRAY_LENGTH; j++) {
            if (((events[j].date.month) > (events[j+1].date.month)) ||
               ((events[j].date.month) == (events[j+1].date.month)) &&
               ((events[j].date.day) > (events[j+1].date.day))) {
               tempEvent = events[j];
               events[j] = events[j+1];
               events[j+1] = tempEvent;
            } // end of if
            
        } //end of inner j for loop
    
    } // end of outer i loop
    
    


    // output the array of structures
    for (i=0; i < ARRAY_LENGTH; i++) {
          if (events[i].type == Anniversary) {
                  printf("Anniversary: ");
          }
    
          else if (events[i].type == Birthday) {
               printf("Birthday: ");
          }
    
          printf("%i ", events[i].date.day);
          printf("%s\n", MONTHS[events[i].date.month-1]);
          printf(" - %s\n\n", events[i].description);
    }// end of for loop
    
// Close the file
	fclose(inputStream);
	
}  

    
//------------------------------------------------------------------------------    
// function to safely open a file and check for success
    FILE *safeOpen(char *fileName, char *mode){
    FILE *stream; // creates file pointer
         
         stream = fopen(fileName, "r"); // attach file to stream
    
    // check for open file success
    if (stream == NULL){
       printf("Error test opening file");
       exit(2);
    }
    return stream; // return inputStream pointer
}// end of function
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
//function to input data from file into structure
Event inputEvent(FILE *inputStream) {
      Event tempEvent;// variable to store the data from file
      int type=0;// variable to store the event type
      
      fscanf(inputStream,"%i ", &type);
      
      // switch to set the enumerated type
      switch (type == 0) {
             case true:
                 tempEvent.type = Birthday;
             break;
             
             case false:
                  tempEvent.type = Anniversary;
             break;
      } // end of switch
      
      fscanf(inputStream, "%i ", &tempEvent.date.day);
      fscanf(inputStream, "%i ", &tempEvent.date.month);
      fscanf(inputStream, "%[^\n]", tempEvent.description);
      
      return tempEvent;// return structure 
      
}// end of function

if (fscanf(inputStream,"%s", storeEOF) == EOF) {
       exit(2);
    }

/ bubble sort algorithm
    for (i=0; i < ARRAY_LENGTH; i++) { 
        
        for (j=0; j < ARRAY_LENGTH; j++) {
            if (((events[j].date.month) > (events[j+1].date.month)) ||
               ((events[j].date.month) == (events[j+1].date.month)) &&
               ((events[j].date.day) > (events[j+1].date.day))) {
               tempEvent = events[j];
               events[j] = events[j+1];
               events[j+1] = tempEvent;
            } // end of if
            
        } //end of inner j for loop
    
    } // end of outer i loop

for (i=0; i < numEvents-1; i++) {
    
        for (j=0; j < numEvents-1; j++) {
                  if (((events[j].date.month) > (events[j+1].date.month)) ||
                  ((events[j].date.month) == (events[j+1].date.month)) &&
                  ((events[j].date.day) > (events[j+1].date.day))) {
                       tempEvent = events[j];
                       events[j] = events[j+1];
                       events[j+1] = tempEvent;
                  } // end of if
            
        } //end of inner j for loop
    } // end of outer i for loop