#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define SIZE 10000

int TestIfFileExists(char *FileName);
void meny(int ProductId, char ProductName[], int StorageBalance, int AmountToScan, FILE *fp);
struct RegisterNewProduct(storage s[],int ProductId, char ProductName[], int StorageBalance, int AmountToScan, FILE *fp);

struct storage
{
    int ProductId;
    char ProductName[30];
    int StorageBalance;

};
//typedef struct storage Storage;

int TestIfFileExists(char *FileName);

int main()

{
    int ProductId, StorageBalance;
    char ProductName[20];
    struct storage s[SIZE];
    //int size = sizeof(s)/sizeof(s[0]);
    char FileName[100];
    printf("Enter filename (xxx.txt): ");
    scanf("%s", FileName);
    FILE *fp;
    int TrueFalse = TestIfFileExists(FileName);
    int i = 0;
    int AmountToScan = 0;
    int n = 0;
    char Buffer[100];

    if (TrueFalse)
    {

        printf("Reading existing file: %s\n", FileName);
        fp = fopen(FileName, "r+");

        while (!feof(fp))
        {
            fgets(Buffer, 100, fp);

            AmountToScan++;

        }

    fclose(fp);

    fp = fopen(FileName, "r+");

    AmountToScan--;


        while (i != AmountToScan)
        {
            fscanf(fp, "%d", &s[i].ProductId);
            fscanf(fp, "%s", s[i].ProductName);
            fscanf(fp, "%d", &s[i].StorageBalance);

            printf("The product id is: %d\n", s[i].ProductId);
            printf("The product name is: %s\n", s[i].ProductName);
            printf("The storage balance is: %d\n", s[i].StorageBalance);
            n++;
            i++;
        }

    fclose(fp);
    fp = fopen(FileName, "a");
    meny(ProductId, ProductName, StorageBalance, AmountToScan, fp);
    fclose(fp);


    }

    if (!TrueFalse)
    {
        printf("Creating new file: %s \n", FileName);
        fp = fopen(FileName, "w");

        struct storage s[SIZE] = { 0 };
    }





}

int TestIfFileExists(char *FileName)
{
    FILE *fp;
    if (fp = fopen(FileName, "r"))
    {
        fclose(fp);
        return 1;
    }
    else
    {
        return 0;
    }

}
void meny(int ProductId, char ProductName[], int StorageBalance, int AmountToScan, FILE *fp)
{
    int MenyChoise;
    int i = 0;

    do
    {
    printf("Would you like to:\nRegister a new product(1)?\nPrint out all products(2)?\nSearch for Product(3)?\nChange storage balance(4)?\nSort products(5)?\nUnregister Product(6)?\nTerminate program(0)?\n");
    printf("Enter your choise: ");
    scanf("%d",&MenyChoise);

        if (MenyChoise == 1)
        {
            RegisterNewProduct(ProductId, ProductName, StorageBalance, AmountToScan, fp);
        }
    }
    while(MenyChoise != 0);
}


struct RegisterNewProduct(storage s[],int ProductId, char ProductName[], int StorageBalance, int AmountToScan, FILE *fp)
{

    fprintf(fp,"%d", s[0].ProductId);
    printf("%d",s[0].ProductId);
    int i;

        {
            i = ++AmountToScan;
            AmountToScan--;
            printf("%d\n",i);

            printf("Enter the product id: ");
            scanf("%d",&s[i].ProductId);
            for (i=0; i < AmountToScan; i++)
            {
               if ((s[AmountToScan].ProductId) != (s[i].ProductId))
                   {
                        fprintf(fp,"%d", s[i].ProductId);
                        printf("Enter the product name is: ");
                        scanf("%s",&s[i].ProductName);
                        fprintf(fp,"    %s", s[i].ProductName);
                        printf("Enter the storage balance: ");
                        scanf("%d",&s[i].StorageBalance);
                        fprintf(fp,"    %d\n", s[i].StorageBalance);

                   }
                   else
                   {
                       printf("error!\n");
                       break;
                   }
            }

        }

}