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# Token Vault Contract

### Address

### Lock and Unlock Functions

```
function lockTokens(
        address _tokenAddress,
        uint256 _amount,
        uint256 _unlockTime,
        address payable _withdrawer
    )
        public returns (uint256 _id)
```

| Parameter      | Description                                            |
| -------------- | ------------------------------------------------------ |
| \_tokenAddress | Address of the token locked.                           |
| \_amount       | Number of tokens locked.                               |
| \_unlockTime   | Timestamp number marking when tokens get unlocked.     |
| \_withdrawer   | Address where tokens can be withdrawn after unlocking. |

Function for locking tokens in the vault.

```
function withdrawTokens(
        address _tokenAddress,
        uint256 _index,
        uint256 _id,
        uint256 _amount
    )
        external
```

| Parameter      | Description                        |
| -------------- | ---------------------------------- |
| \_tokenAddress | Address of the token to withdraw.  |
| \_index        | Index number of the list with Ids. |
| \_id           | Id number of the locked item.      |
| \_amount       | Number of tokens to withdraw.      |

Function for withdrawing tokens from the vault.

### Read-Only Functions

```
function getItemAtUserIndex(
        uint256 _index,
        address _tokenAddress,
        address _user
    )
        external view returns (uint256, uint256, address, uint256)
```

| Name           | Description                                      |
| -------------- | ------------------------------------------------ |
| \_index        | Index number of the list with Item ids.          |
| \_tokenAddress | Address of the token corresponding to this Item. |
| \_user         | User address.                                    |

Function to retrieve data from the Item under user index number.

```
function getUserLockedItemAtIndex(
        address _user, 
        uint256 _index
    ) 
        external view returns (address)
```

| Name    | Description   |
| ------- | ------------- |
| \_user  | User address. |
| \_index | Index number. |

Function to retrieve token address at desired index for the specified user.

```
function getLockedItemAtId(uint256 _id) 
    external 
    view 
    returns (uint256, uint256, address, uint256)
```

| Name | Description |
| ---- | ----------- |
| \_id | Id number.  |

Function to retrieve all the data from Item struct under given Id.