contract EternalStorage {

    /// @notice Internal mappings used to store all kinds on data into the contract
    mapping(bytes32 => uint256) internal uintStorage;
    mapping(bytes32 => string) internal stringStorage;
    mapping(bytes32 => address) internal addressStorage;
    mapping(bytes32 => bytes) internal bytesStorage;
    mapping(bytes32 => bool) internal boolStorage;
    mapping(bytes32 => int256) internal intStorage;
    mapping(bytes32 => bytes32) internal bytes32Storage;

    /// @notice Internal mappings used to store arrays of different data types
    mapping(bytes32 => bytes32[]) internal bytes32ArrayStorage;
    mapping(bytes32 => uint256[]) internal uintArrayStorage;
    mapping(bytes32 => address[]) internal addressArrayStorage;
    mapping(bytes32 => string[]) internal stringArrayStorage;

    //////////////////
    //// set functions
    //////////////////
    /// @notice Set the key values using the Overloaded `set` functions
    /// Ex- string version = "0.0.1"; replace to
    /// set(keccak256(abi.encodePacked("version"), "0.0.1");
    /// same for the other variables as well some more example listed below
    /// ex1 - address securityTokenAddress = 0x123; replace to
    /// set(keccak256(abi.encodePacked("securityTokenAddress"), 0x123);
    /// ex2 - bytes32 tokenDetails = "I am ST20"; replace to
    /// set(keccak256(abi.encodePacked("tokenDetails"), "I am ST20");
    /// ex3 - mapping(string => address) ownedToken;
    /// set(keccak256(abi.encodePacked("ownedToken", "Chris")), 0x123);
    /// ex4 - mapping(string => uint) tokenIndex;
    /// tokenIndex["TOKEN"] = 1; replace to set(keccak256(abi.encodePacked("tokenIndex", "TOKEN"), 1);
    /// ex5 - mapping(string => SymbolDetails) registeredSymbols; where SymbolDetails is the structure having different type of values as
    /// {uint256 date, string name, address owner} etc.
    /// registeredSymbols["TOKEN"].name = "MyFristToken"; replace to set(keccak256(abi.encodePacked("registeredSymbols_name", "TOKEN"), "MyFirstToken");
    /// More generalized- set(keccak256(abi.encodePacked("registeredSymbols_<struct variable>", "keyname"), "value");

    function set(bytes32 _key, uint256 _value) internal {
        uintStorage[_key] = _value;
    }

    function set(bytes32 _key, address _value) internal {
        addressStorage[_key] = _value;
    }

    function set(bytes32 _key, bool _value) internal {
        boolStorage[_key] = _value;
    }

    function set(bytes32 _key, bytes32 _value) internal {
        bytes32Storage[_key] = _value;
    }

    function set(bytes32 _key, string _value) internal {
        stringStorage[_key] = _value;
    }

    ////////////////////
    /// get functions
    ////////////////////
    /// @notice Get function use to get the value of the singleton state variables
    /// Ex1- string public version = "0.0.1";
    /// string _version = getString(keccak256(abi.encodePacked("version"));
    /// Ex2 - assert(temp1 == temp2); replace to
    /// assert(getUint(keccak256(abi.encodePacked(temp1)) == getUint(keccak256(abi.encodePacked(temp2));
    /// Ex3 - mapping(string => SymbolDetails) registeredSymbols; where SymbolDetails is the structure having different type of values as
    /// {uint256 date, string name, address owner} etc.
    /// string _name = getString(keccak256(abi.encodePacked("registeredSymbols_name", "TOKEN"));

    function getBool(bytes32 _key) internal view returns (bool) {
        return boolStorage[_key];
    }

    function getUint(bytes32 _key) internal view returns (uint256) {
        return uintStorage[_key];
    }

    function getAddress(bytes32 _key) internal view returns (address) {
        return addressStorage[_key];
    }

    function getString(bytes32 _key) internal view returns (string) {
        return stringStorage[_key];
    }

    function getBytes32(bytes32 _key) internal view returns (bytes32) {
        return bytes32Storage[_key];
    }


    ////////////////////////////
    // deleteArray functions
    ////////////////////////////
    /// @notice Function used to delete the array element.
    /// Ex1- mapping(address => bytes32[]) tokensOwnedByOwner;
    /// For deleting the item from array developers needs to create a funtion for that similarly
    /// in this case we have the helper function deleteArrayBytes32() which will do it for us
    /// deleteArrayBytes32(keccak256(abi.encodePacked("tokensOwnedByOwner", 0x1), 3); -- it will delete the index 3


    //Deletes from mapping (bytes32 => array[]) at index _index
    function deleteArrayAddress(bytes32 _key, uint256 _index) internal {
        address[] storage array = addressArrayStorage[_key];
        require(_index < array.length, "Index should less than length of the array");
        array[_index] = array[array.length - 1];
        array.length = array.length - 1;
    }

    //Deletes from mapping (bytes32 => bytes32[]) at index _index
    function deleteArrayBytes32(bytes32 _key, uint256 _index) internal {
        bytes32[] storage array = bytes32ArrayStorage[_key];
        require(_index < array.length, "Index should less than length of the array");
        array[_index] = array[array.length - 1];
        array.length = array.length - 1;
    }

    //Deletes from mapping (bytes32 => uint[]) at index _index
    function deleteArrayUint(bytes32 _key, uint256 _index) internal {
        uint256[] storage array = uintArrayStorage[_key];
        require(_index < array.length, "Index should less than length of the array");
        array[_index] = array[array.length - 1];
        array.length = array.length - 1;
    }

    //Deletes from mapping (bytes32 => string[]) at index _index
    function deleteArrayString(bytes32 _key, uint256 _index) internal {
        string[] storage array = stringArrayStorage[_key];
        require(_index < array.length, "Index should less than length of the array");
        array[_index] = array[array.length - 1];
        array.length = array.length - 1;
    }

    ////////////////////////////
    //// pushArray functions
    ///////////////////////////
    /// @notice Below are the helper functions to facilitate storing arrays of different data types.
    /// Ex1- mapping(address => bytes32[]) tokensOwnedByTicker;
    /// tokensOwnedByTicker[owner] = tokensOwnedByTicker[owner].push("xyz"); replace with
    /// pushArray(keccak256(abi.encodePacked("tokensOwnedByTicker", owner), "xyz");

    /// @notice use to store the values for the array
    /// @param _key bytes32 type
    /// @param _value [uint256, string, bytes32, address] any of the data type in array
    function pushArray(bytes32 _key, address _value) internal {
        addressArrayStorage[_key].push(_value);
    }

    function pushArray(bytes32 _key, bytes32 _value) internal {
        bytes32ArrayStorage[_key].push(_value);
    }

    function pushArray(bytes32 _key, string _value) internal {
        stringArrayStorage[_key].push(_value);
    }

    function pushArray(bytes32 _key, uint256 _value) internal {
        uintArrayStorage[_key].push(_value);
    }

    /////////////////////////
    //// Set Array functions
    ////////////////////////
    /// @notice used to intialize the array
    /// Ex1- mapping (address => address[]) public reputation;
    /// reputation[0x1] = new address[](0); It can be replaced as
    /// setArray(hash('reputation', 0x1), new address[](0)); 
    
    function setArray(bytes32 _key, address[] _value) internal {
        addressArrayStorage[_key] = _value;
    }

    function setArray(bytes32 _key, uint256[] _value) internal {
        uintArrayStorage[_key] = _value;
    }

    function setArray(bytes32 _key, bytes32[] _value) internal {
        bytes32ArrayStorage[_key] = _value;
    }

    function setArray(bytes32 _key, string[] _value) internal {
        stringArrayStorage[_key] = _value;
    }

    /////////////////////////
    /// getArray functions
    /////////////////////////
    /// @notice Get functions to get the array of the required data type
    /// Ex1- mapping(address => bytes32[]) tokensOwnedByOwner;
    /// getArrayBytes32(keccak256(abi.encodePacked("tokensOwnedByOwner", 0x1)); It return the bytes32 array
    /// Ex2- uint256 _len =  tokensOwnedByOwner[0x1].length; replace with
    /// getArrayBytes32(keccak256(abi.encodePacked("tokensOwnedByOwner", 0x1)).length;

    function getArrayAddress(bytes32 _key) internal view returns(address[]) {
        return addressArrayStorage[_key];
    }

    function getArrayBytes32(bytes32 _key) internal view returns(bytes32[]) {
        return bytes32ArrayStorage[_key];
    }

    function getArrayString(bytes32 _key) internal view returns(string[]) {
        return stringArrayStorage[_key];
    }

    function getArrayUint(bytes32 _key) internal view returns(uint[]) {
        return uintArrayStorage[_key];
    }

    ///////////////////////////////////
    /// setArrayIndexValue() functions
    ///////////////////////////////////
    /// @notice set the value of particular index of the address array
    /// Ex1- mapping(bytes32 => address[]) moduleList;
    /// general way is -- moduleList[moduleType][index] = temp; 
    /// It can be re-write as -- setArrayIndexValue(keccak256(abi.encodePacked('moduleList', moduleType)), index, temp); 

    function setArrayIndexValue(bytes32 _key, uint256 _index, address _value) internal {
        addressArrayStorage[_key][_index] = _value;
    }

    function setArrayIndexValue(bytes32 _key, uint256 _index, uint256 _value) internal {
        uintArrayStorage[_key][_index] = _value;
    }

    function setArrayIndexValue(bytes32 _key, uint256 _index, bytes32 _value) internal {
        bytes32ArrayStorage[_key][_index] = _value;
    }

    function setArrayIndexValue(bytes32 _key, uint256 _index, string _value) internal {
        stringArrayStorage[_key][_index] = _value;
    }

        /////////////////////////////
        /// Public getters functions
        /////////////////////////////

    function getUintValues(bytes32 _variable) public view returns(uint256) {
        return uintStorage[_variable];
    }

    function getBoolValues(bytes32 _variable) public view returns(bool) {
        return boolStorage[_variable];
    }

    function getStringValues(bytes32 _variable) public view returns(string) {
        return stringStorage[_variable];
    }

    function getAddressValues(bytes32 _variable) public view returns(address) {
        return addressStorage[_variable];
    }

    function getBytes32Values(bytes32 _variable) public view returns(bytes32) {
        return bytes32Storage[_variable];
    }

    function getBytesValues(bytes32 _variable) public view returns(bytes) {
        return bytesStorage[_variable];
    }

}
function deleteArrayUint(bytes32 _key, uint256 _index) internal {
    uint256[] storage array = uintArrayStorage[_key];
    require(_index < array.length, "Index should less than length of the array");
    array[_index] = array[array.length - 1];
    array.length = array.length - 1;
}

//Deletes from mapping (bytes32 => uint[]) at index _index