Asset Financing with Accounts Receivable in Solidity

FinancingPlatform.sol

pragma solidity ^0.5;

contract FinancingPlatform {

    address public admin;
    mapping(bytes32 => FinancingConditions) public financingRegistry;
    
    struct FinancingConditions {
        uint256 amount;
        uint256 discountedAmount;
        address payable receiver;
        address payable financer;
        bool financed;
        bool paid;
    }

    event Registered(bytes32 indexed _financing);
    event Financed(bytes32 indexed _financing);
    event Paid(bytes32 indexed _financing);
    
    constructor() public {
        admin = msg.sender;
    }

    function registerAssetForFinancing(bytes32 asset, uint256 amount, uint8 discount) public {
        if (financingRegistry[asset].amount > 0) {
            revert("Asset already registered or financed.");
        }
        if ((discount < 0) || (discount > 100)) {
            revert("Discount must be between 0% and 100%.");
        }
        uint256 discountedAmount = amount * discount / 100;
        FinancingConditions memory conds = FinancingConditions(
        {
            amount: amount,
            discountedAmount: discountedAmount,
            receiver: msg.sender,
            financer: address(0x0),
            financed: false,
            paid: false
        });
        financingRegistry[asset] = conds;
        emit Registered(asset);
    }
    
    function financeAsset(bytes32 asset) public payable {
        if (financingRegistry[asset].amount == 0) {
            revert("Asset not registered.");
        }
        FinancingConditions memory conds = financingRegistry[asset];
        if (((conds.amount - conds.discountedAmount) * 10**18) != msg.value) {
            revert("Submitted value is not correct.");
        }
        conds.financed = true;
        conds.financer = msg.sender;
        financingRegistry[asset] = conds;
        conds.receiver.transfer((conds.amount - conds.discountedAmount) * 10**18);
        emit Financed(asset);
    }
    
    function settleFinancedAsset(bytes32 asset) public payable {
        if (financingRegistry[asset].amount == 0) {
            revert("Asset not registered.");
        }
        FinancingConditions memory conds = financingRegistry[asset];
        if (!conds.financed) {
            revert("Asset has not been financed.");
        }
        if (msg.value != conds.amount * 10**18) {
            revert("Submitted value is not Asset amount.");
        }
        conds.paid = true;
        financingRegistry[asset] = conds;
        conds.financer.transfer(conds.amount * 10**18);
        emit Financed(asset);
    }
    
}