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

typedef char song[51];
int i=1;


typedef struct{
    int num;
    song name;
    song artist;
    song genre;
    song album;
    int rating;
    char remarks[200];
}SONG;

SONG title[100];


int add(){

  FILE *fp;

  fp = fopen("data.dat", "a");
    if(fp==NULL){printf("cant open.");}
    fprintf(fp, "WELCOME!");
  fclose(fp);


  fp = fopen("date.dat", "r");

    if(fp==NULL){printf("cant open.");}

    if(fscanf(fp, "%d", &title[i].num)==0){
      title[i].num=i;}

    else{
      while(fscanf(fp, "%d", &title[i].num)!=0){
      i=i+1;}
     }

  fclose(fp);


  printf("Add song.\n");

  fp = fopen("data.dat", "a");

    printf("Title: ");
    fgets(title[i].name, 50, stdin);
    fprintf(fp,"%s", title[i].name);

    printf("Artist/Composer: ");
    fgets(title[i].artist, 50, stdin);
    fprintf(fp,"%s", title[i].artist);

    printf("Genre (Art, Popular, Traditional) : ");
    fgets(title[i].genre, 50, stdin);
    fprintf(fp,"%s", title[i].genre);

    printf("Album: ");
    fgets(title[i].album, 50, stdin);
    fprintf(fp,"%s", title[i].album);

    printf("Rating: ");
    scanf("%d", &title[i].rating);
    getchar();
    fprintf(fp,"%d", title[i].rating);

    printf("Remarks: ");
    fgets(title[i].album, 199, stdin);
    fprintf(fp,"%s", title[i].remarks);


  fclose(fp);

  printf("\n\n");

  return main();
}

int display(){
  FILE *fp;

  fp = fopen("data.dat", "r");

    if(fp==NULL){printf("cant open.");}

    while(fscanf(fp, "%d", &title[i].num)!=0){
       i=i+1;

       printf("\n");

       fscanf(fp, "%s", &title[i].name);
       printf("%s", title[i].name);
       }

  fclose(fp);
  printf("\n\n");
  return main();
}


int main() {
int op;
printf("What do you want to do?\n\n");
printf("  1. Add a song.\n");
printf("  2. Update a song.\n");
printf("  3. List songs.\n");
printf("  4. Remove duplicate songs.\n");
printf("  5. Exit.\n\n");
printf("Enter the number corresponding to the operation: ");
scanf("%d", &op);
getchar();

if(op==1){
  add();}

if(op==3){
  display();}

if(op==5){
  return 0;}

return 0;
}