Mai Staking

MaiStaking.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

contract MaiStaking
{
    uint public genesisTimestamp;
    uint public auctionDuration = 15 minutes;

    constructor() {
        genesisTimestamp = block.timestamp;
    }

    struct Auction {
        uint price;
        address bidder;
        bool is_claimed;
        uint bid_history_amount;
    }

    struct Bid {
        uint price;
        address bidder;
    }

    mapping(uint => Auction) public auctions;
    mapping(uint => mapping(uint => Bid)) public bidHistory;

    function bid(uint auction_id, uint mai_amount) public {
        require(isActive(auction_id), "Auction must be active.");
        require(mai_amount > auctions[auction_id].price, "Mai amount is less than current price.");
        bidHistory[auction_id][auctions[auction_id].bid_history_amount].price = mai_amount;
        bidHistory[auction_id][auctions[auction_id].bid_history_amount].bidder = msg.sender;
        auctions[auction_id].bidder = msg.sender;
        auctions[auction_id].price = mai_amount;
        auctions[auction_id].bid_history_amount += 1;
    }

    function claim(uint auction_id) public {
        require(block.timestamp > genesisTimestamp + ((auction_id + 1) * auctionDuration), "Can't claim before auction to end");
        require(!auctions[auction_id].is_claimed, "This NFT was already claimed");
        require(msg.sender == auctions[auction_id].bidder, "Only winner can claim");
        auctions[auction_id].is_claimed = true;
    }

    function getCurrentAuctionId() public view returns(uint)
    {
        return (block.timestamp - genesisTimestamp) / auctionDuration;
    }

    function isActive(uint auction_id) public view returns(bool)
    {
        return block.timestamp > genesisTimestamp + (auction_id * auctionDuration)
            && block.timestamp < genesisTimestamp + ((auction_id + 1) * auctionDuration);
    }
}

MaiStakingAbi.json

[
	{
		"inputs": [],
		"stateMutability": "nonpayable",
		"type": "constructor"
	},
	{
		"inputs": [],
		"name": "auctionDuration",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"name": "auctions",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "price",
				"type": "uint256"
			},
			{
				"internalType": "address",
				"name": "bidder",
				"type": "address"
			},
			{
				"internalType": "bool",
				"name": "is_claimed",
				"type": "bool"
			},
			{
				"internalType": "uint256",
				"name": "bid_history_amount",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "auction_id",
				"type": "uint256"
			},
			{
				"internalType": "uint256",
				"name": "mai_amount",
				"type": "uint256"
			}
		],
		"name": "bid",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			},
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"name": "bidHistory",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "price",
				"type": "uint256"
			},
			{
				"internalType": "address",
				"name": "bidder",
				"type": "address"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "auction_id",
				"type": "uint256"
			}
		],
		"name": "claim",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "genesisTimestamp",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "getCurrentAuctionId",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "auction_id",
				"type": "uint256"
			}
		],
		"name": "isActive",
		"outputs": [
			{
				"internalType": "bool",
				"name": "",
				"type": "bool"
			}
		],
		"stateMutability": "view",
		"type": "function"
	}
]

Rinkeby address:
0xcf9eea9e11f7ad18a14a8670C757f09043A524Bf