#include "Ware.h"
#include <list>
#include <string>

#pragma once
typedef int (*hashFunctionPtr)(
    std::string); //  typedefinition of a pointer for a hashfunction; they all
                  //  need conform to the guideline: int
                  //  <functionName>(std::string <param>)

int mod17(std::string telNr); //  hash algorithm that takes a given telNr mod17

int firstTwoLetters(std::string bezeichnung);

class HashTable {
private:
  class HashFunction { //  private inner class to make hash functions managable
  public:
    int size;
    std::string name;
    hashFunctionPtr algorithm;

    HashFunction(std::string name, hashFunctionPtr algorithm,
                 int size); //  constructor
  };

  HashFunction availableAlgorithms[1] = {
      {"firstTwoLetters", firstTwoLetters, 100}};

  class HashNode { //  private inner class for HashNodes that have a key (which
                   //  will be the telephone number) and a value of type Ware
  public:
    std::string key = "";
    Ware *ware;
  };

public:
  int size;                     //  m in lecture
  int numberOfEntries;          //  n in lecture
  std::list<HashNode> *entries; //  nodes of the hash table
  hashFunctionPtr hashFunction; //  pointer to the hash algorithm used is stored
                                //  in a private variable of type
                                //  hashFunctionPtr - see beginning of this file

  void insert(Ware *entry);
  const Ware *search(std::string key);
  bool deleteItem(std::string key);
  void print();
  void setHashFunction(std::string name);

  HashTable(); //  default constructor

  int getHash(std::string bezeichnung) const;
};