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

typedef struct item_t // typedef struct of item_t
{
    char* name;
    float price;
    int quantity;
} item_t;

int numberOfItemsInWarehouse(item_t** items)
{
    int cnt=0;;
    for(int it = 0; it<5; it++)
    {
        if (items[it] != NULL)
        {
          cnt++;
        }
    }
    return cnt;
}

void addItem(item_t** items, char* name, float price, int quantity)
{
    //printf("%s // %f // %d\n", name, price, quantity);
    for (int it=0; it<5; it++)
    {
      if (items[it] == NULL)
      {
        //char* _name = (char*)malloc(sizeof(name));
        //_name = name;
        items[it] = malloc(sizeof(item_t));
        items[it]->price = price;
        items[it]->quantity = quantity;
        items[it]->name = malloc(sizeof(name));
        strcpy(((items[it])->name),name);
        //items[it] = item;

        //printf("add:%s / %f / %d\n",items[it]->name, items[it]->price, items[it]->quantity);

        return;
      }
    }
    printf("Warehouse is full!\n");
}

void printInventory(item_t** items)
{
    //printf("printing\n");
    for(int it = 0; it<5; it++)
    {
        if(items[it] != NULL)
        {
            //printf("not null\n");
            printf("%s / %.2f / %d\n",items[it]->name, items[it]->price, items[it]->quantity);
        }
    }
}

void removeItem(item_t** items, char* name)
{
    printf("name =%s\n",name);
    printf("items[it]->name =%s\n",items[0]->name);
    printf("items[it]->name =%s\n",items[1]->name);

    for( int it = 0; it < 5; it++)
    {
        if ((items[it] != NULL) && (strcmp( items[it]->name, name) == 0));
        {
            printf("%s / %.2f / %d\n",items[it]->name, items[it]->price, items[it]->quantity);
            free(items[it]->name);
            free(items[it]);
            items[it]->name = NULL;
            items[it] = NULL;
            /*for(int it2 = 4; it2 > it; it2--)
            {
              if(items[it2] != NULL)
              {
                  items[it] = items[it2];
                  items[it2] = NULL;
                  return;
              }
            }*/
            //while( (it < 4) && (items[it+1] != NULL))
            //{
            //    items[it] = items[it+1];
            //    it++;
            //}
            //items[it] = NULL;

            return;
        }
    }
}

int main(void)
{
  item_t* wareHouse[5];  // create pointer array for warehouse

  for(int it =0; it<5; it++) // initialise all pointers at NULL
  {
      wareHouse[it] = NULL;
  }

  char command;
  char name[100];
  float price = 0;
  int quantity = 0;

  while(1)
  {
    printf("Command (a/r/p/i/s/q): ");
    scanf(" %c", &command);
    if (command == 'a')
    {
      printf("Add item.\n");
      printf("name? ");
      //scanf(" %s", name);
      char c;
      while((c=getchar() != '\n'));
      scanf("%[^\n]%*c",name);

      printf("price? ");
      scanf(" %f", &price);
      printf("quantity? ");
      scanf(" %d", &quantity);

      addItem(wareHouse, name, price, quantity);
    }
    else if (command == 'p')
    {
        printf("Inventory:\n");// print inventory
        printInventory(wareHouse);
    }
    else if (command == 'q') // quit program
    {
       return 0;
    }
    else if (command == 'r') // remove item
    {
      printf("remove item: ");
      scanf(" %s", name);
      removeItem(wareHouse,name);
    }
    else if (command == 'i') // sell item
    {

    }
    else if (command == 's') // sort item on price
    {

    }
 }

  return -1; // error
}