Task: NFT Lottery

You have to create a NFT Lottery on a Foundry environment. Users should be able to buy a ticket which is an actual NFT. The funds from each ticket purchase are gathered in a prize pool. After a certain period of time a random winner should be chosen. We also want to be able to update our NFT tickets in the future.

Contracts:

Ticket

• You should create NFT contract that represents a ticket.
• A ticket should have simple metadata on-chain data.
• Bonus * Additional data can be stored off-chain.
• Users should be able to buy tickets.
• Starting from a particular block people can buy tickets for limited time.
• Funds from purchases should be stored in the contract.
• Only the contract itself can use these funds.
• After purchase time ends a random winner should be selected. You can complete simple random generation.
• A function for a surprise winner should be created which will award the random generated winner with 50% of the gathered funds.

Proxy

• A simple proxy contract should be created that should use the deployed ticket as its implementation.

Factory

• The factory should be able to deploy proxies.
• Bonus * The proxy deployment can be achieved using create2.

Environment

• The written contracts should be deployed on a Hardgat or Foundry environment.
• A sample purchases should be acomplished.
• For the purpose of the task a surprise winner should be selected before the time ends, collecting 50% of the gathered funds. At the end of the time another winner will collect all gathered funds left.
• Bonus * Write simple tests verifying the deployment and the lottery winner.
• The complicity of the contracts and testing is up to you.

What can be used:

• Solidity
• JS
• Hardhat
• Foundry
• Ethers / Web3
• Any other library considered necessary

Submissions

• Please upload your complete source code to a GitHub repo.
• How we will test your code: git clone yarn npx hardhat run scripts/lottery.js OR npx hardhat test (if bonus task is done)

Contract Structure

// Layout of Contract: // version // imports // errors // interfaces, libraries, contracts // Type declarations // State variables // Events // Modifiers // Functions

// Layout of Functions: // constructor // receive function (if exists) // fallback function (if exists) // external // public // internal // private // view & pure functions