# BuyNow

`BuyNow.sol` is a module contract that enables users to buy assets within the Unlockd Protocol. It provides functionality for instant asset purchases, allowing users to buy assets using a combination of their own funds and borrowed funds from the protocol.

### Key functions:

```solidity
function getCalculations(
    DataTypes.SignBuyNow calldata signBuyMarket
) external pure returns (uint256, uint256)
```

Calculates the minimum amount required and the maximum amount that can be borrowed for a buy now operation based on the buy now data.

### Parameters:

`signBuyMarket`: The signed buy now data.

### Returns:

The minimum amount required from the user.

The maximum amount that can be borrowed.

***

```solidity
function buy(
    uint256 amount,
    DataTypes.SignBuyNow calldata signBuyMarket,
    DataTypes.EIP712Signature calldata sig
) external 
```

Allows users to perform a buy now operation, purchasing an asset using the specified amount and creating a loan if necessary. It validates the signature, retrieves the user's Unlockd wallet and protocol owner addresses, updates the reserve state, transfers the user's contribution to the market adapter, creates a loan if necessary, and purchases the asset using the market adapter.

### Parameters:

`amount`: The amount to contribute towards the purchase.

`signBuyMarket`: The signed buy now data.

`sig`: The EIP-712 signature for the buy operation.

## Signature

#### `signBuyMarket` (type: `DataTypes.SignBuyNow`), it contains the following fields:

`asset` (type: `DataTypes.SignAsset`): The asset data, including the asset ID, collection address, token ID, price, nonce, and deadline.

`assetLtv` (type: `uint256`): The loan-to-value ratio of the asset.

`assetLiquidationThreshold` (type: `uint256`): The liquidation threshold of the asset.

`from` (type: `address`): The address from which the buy now action is initiated.

`to` (type: `address`): The address to which the asset is being bought.

`data` (type: `bytes`): Additional data for the buy now action.

`value` (type: `uint256`): The value being sent with the buy now action.

`marketAdapter` (type: `address`): The address of the market adapter used for the buy now action.

`marketApproval` (type: `address`): The address for market approval.

`marketPrice` (type: `uint256`): The market price of the asset.

`underlyingAsset` (type: `address`): The address of the underlying asset.

`nonce` (type: `uint256`): The nonce value is used to ensure the uniqueness of the signature and prevent replay attacks.

`deadline` (type: `uint256`): The deadline timestamp until which the signature is considered valid.

#### `sig` (type: `DataTypes.EIP712Signature`), it contains the following fields:

`v` (type: `uint8`): The recovery ID of the signature.

`r` (type: `bytes32`): The first 32 bytes of the signature.

`s` (type: `bytes32`): The second 32 bytes of the signature.

`deadline` (type: `uint256`): The deadline timestamp until which the signature is considered valid.


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