# Methods

#### Deposit Position <a href="#deposit-principal" id="deposit-principal"></a>

```
function depositPosition(uint256 _nftId, address _fcTokensTo) public returns(address, uint256);
```

This function lets any holder of a FlashNFT to deposit that FlashNFT into this contract and then mint fc-Tokens. The depositor can specify which address to send the fc-Tokens to.&#x20;

#### Withdraw Position Owner

```
function withdrawPositionOwner(uint256 _nftId, address _nftTo) external;
```

This function will withdraw the FlashNFT from this contract by burning the borrowed fc-Tokens. Only the original depositor can withdraw the FlashNFT. The caller can specify which address to send the FlashNFT to.

#### Partial  Withdraw Owner

```
function partialWithdrawOwner(uint256 _nftId, uint256 _fTokensToBurn, address _withdrawTo) external;
```

This function allows principal to be removed from the deposited FlashNFT by paying back both fTokens and fc-Tokens, as though it was both a partial unstake early and a partial collateral payback.

#### Initialise Strategy

```
function initialiseStrategy(address _fsAddress) external;
```

This deploys a new fc-Token for any given strategy address. This only needs to be called once per strategy, and anyone can call this.

#### Get Current Auction Cost

```
function getCurrentAuctionCost(uint256 _nftId, uint256 _flashtronautNftId)
```

This provides the current $FLASH tokens cost for any current auction, by providing the originally deposited FlashNFT id and optionally a Flashtronaut NFT id to receive a discounted FLASH cost.

* Note: The caller must be holding the Flashtronaut in their wallet and calls to this function must be made from the caller otherwise the function will revert with an error.

#### Auction Purchase

```
function auctionPurchase(uint256 _nftId, uint256 _flashtronautNftId);
```

This function will purchase a FlashNFT at auction. The total fc-Tokens and FLASH tokens required to pay for and win the auction will be automatically calculated and removed from the users wallet who calls this function.

* Note: fc-Tokens and Flash must be approved for spending against the Liquid Stake contracts for this function to execute successfully.

### Owner Methods

#### Set Auction Tokens Destination <a href="#deposit-principal" id="deposit-principal"></a>

```
function setAuctionTokensDestination(address _newAuctionTokensDestination) external;
```

This function will change which address the FLASH tokens are sent to when a user spends FLASH tokens to win an auction.

{% hint style="info" %}
This function can only be called by the Owner.
{% endhint %}

#### Set Flashtronaut NFT Address <a href="#deposit-principal" id="deposit-principal"></a>

```
 function setFlashtronautNFTAddress(address _newFlashtronautNFTAddress) external;
```

This function will change which contract address is the only one recognized as the official Flashtronaut NFT address, that any NFT holder of that contract will receive the 10% discount on the FLASH token cost at auctions. &#x20;

* Note: Networks which do not have Flashtronauts are configured to use a dummy NFT contract address where there are no items in the collection. This effectively means there is no discount on these networks.

{% hint style="info" %}
This function can only be called by the Owner.
{% endhint %}

### Helper Methods

#### Quote fcTokens

```
function quoteFCTokens(uint256 _nftId) external;
```

This function provides a calculation of total fc-Tokens minted for the given FlashNFT

#### Get Auction Start Details

```
function getAuctionStartDetails(uint256 _nftId) external;
```

This function provides a calculation of the exact start time of an auction, and if it has already started yet, for any given FlashNFT


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