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| // SPDX-License-Identifier: MIT | ||
| pragma solidity >=0.8.0 <0.9.0; | ||
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| // Useful for debugging. Remove when deploying to a live network. | ||
| // Hardhat console for debugging purposes. Remove this import for production deployment. | ||
| import "hardhat/console.sol"; | ||
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| // Use openzeppelin to inherit battle-tested implementations (ERC20, ERC721, etc) | ||
| // Importing OpenZeppelin's Ownable contract for access control functionalities. | ||
| import "@openzeppelin/contracts/access/Ownable.sol"; | ||
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| // The KindKoin_DonationHub contract for handling project donations. | ||
| contract KindKoin_DonationHub is Ownable { | ||
| // Structure to store information about each project | ||
| // Project struct to hold each project's wallet address and total donations received. | ||
| struct Project { | ||
| address payable wallet; // Wallet address to receive donations | ||
| uint totalDonations; // Total amount of donations received | ||
| address payable wallet; | ||
| uint totalDonations; | ||
| } | ||
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| // Service fee percentage, initialized to 1% | ||
| uint public serviceFeePercentage = 1; | ||
| // Variable to store the service fee percentage. Initialized to 1% (10 basis points). | ||
| uint public serviceFeePercentage = 10; // 1% = 10 basis points | ||
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| // Mapping from project ID to project details | ||
| // Mapping to store project details by their ID. | ||
| mapping(uint => Project) private projects; | ||
| // Mapping to track total donations made by each user | ||
| // Mapping to track the total donations made by each user. | ||
| mapping(address => uint) private userTotalDonations; | ||
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| // Event emitted when a donation is made | ||
| // Event to log donation activities. | ||
| event DonationMade(address indexed donor, uint indexed projectId, uint amount); | ||
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| // Function to add a new project or update an existing one to the platform | ||
| // Function to add a new project. Existing projects cannot be updated (wallet address is immutable). | ||
| function setProject(uint projectId, address payable projectWallet) public onlyOwner { | ||
| require(projects[projectId].wallet == address(0), "Project already exists"); | ||
| projects[projectId] = Project(projectWallet, 0); | ||
| } | ||
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| // Function to remove a project from the platform | ||
| // Function to remove a project from the platform. | ||
| function removeProject(uint projectId) public onlyOwner { | ||
| delete projects[projectId]; | ||
| } | ||
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| // Function to adjust the service fee percentage | ||
| // Function to adjust the service fee percentage in 0.1% steps. | ||
| function adjustServiceFee(uint newFeePercentage) public onlyOwner { | ||
| require(newFeePercentage >= 0 && newFeePercentage <= 3, "Fee must be between 0% and 3%"); | ||
| require(newFeePercentage >= 0 && newFeePercentage <= 30, "Fee must be between 0% and 3%"); | ||
| serviceFeePercentage = newFeePercentage; | ||
| } | ||
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| // Function to handle donation transactions | ||
| // Function to handle donation transactions to a specific project. | ||
| function donate(uint projectId) public payable { | ||
| require(msg.value > 0, "Donation must be greater than 0"); | ||
| require(projects[projectId].wallet != address(0), "Project does not exist"); | ||
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| // Calculate the service fee and the actual donation amount | ||
| uint fee = (msg.value * serviceFeePercentage) / 100; | ||
| uint fee = (msg.value * serviceFeePercentage) / 1000; // Calculating the fee | ||
| uint donationAmount = msg.value - fee; | ||
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| // Transfer the donation to the project's wallet | ||
| projects[projectId].wallet.transfer(donationAmount); | ||
| // Update total donations for the project | ||
| projects[projectId].totalDonations += donationAmount; | ||
| // Update total donations made by the user | ||
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| userTotalDonations[msg.sender] += donationAmount; | ||
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| // Transfer the fee to the contract owner | ||
| payable(owner()).transfer(fee); | ||
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| // Emit an event for the donation | ||
| emit DonationMade(msg.sender, projectId, donationAmount); | ||
| } | ||
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| // Function to donate evenly across all projects | ||
| function donateToAllProjects() public payable { | ||
| require(msg.value > 0, "Donation must be greater than 0"); | ||
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| // Calculate the service fee | ||
| uint fee = (msg.value * serviceFeePercentage) / 100; | ||
| uint remainingAmount = msg.value - fee; | ||
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| // Calculate the number of projects | ||
| uint projectCount = 0; | ||
| for (uint i = 0; ; i++) { | ||
| if (projects[i].wallet != address(0)) { | ||
| projectCount++; | ||
| } else { | ||
| break; | ||
| } | ||
| } | ||
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| require(projectCount > 0, "No projects to donate to"); | ||
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| // Calculate the donation amount for each project | ||
| uint donationPerProject = remainingAmount / projectCount; | ||
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| // Distribute the donations to each project | ||
| for (uint i = 0; i < projectCount; i++) { | ||
| if (projects[i].wallet != address(0)) { | ||
| projects[i].wallet.transfer(donationPerProject); | ||
| projects[i].totalDonations += donationPerProject; | ||
| } | ||
| } | ||
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| // Update total donations made by the user | ||
| userTotalDonations[msg.sender] += remainingAmount; | ||
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| // Transfer the fee to the contract owner | ||
| payable(owner()).transfer(fee); | ||
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| // Emit an event for each donation made to a project | ||
| for (uint i = 0; i < projectCount; i++) { | ||
| if (projects[i].wallet != address(0)) { | ||
| emit DonationMade(msg.sender, i, donationPerProject); | ||
| } | ||
| } | ||
| } | ||
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| // Function to get the total donations for a specific project | ||
| // Function to get the total donations for a specific project. | ||
| function getTotalDonations(uint projectId) public view returns (uint) { | ||
| return projects[projectId].totalDonations; | ||
| } | ||
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| // Function to get the total amount donated by a specific user | ||
| // Function to get the total amount donated by a specific user. | ||
| function getUserTotalDonations(address user) public view returns (uint) { | ||
| return userTotalDonations[user]; | ||
| } | ||
| // Function to retrieve the wallet address of a project based on its ID | ||
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| // Function to retrieve the wallet address of a project based on its ID. | ||
| function getWalletAddressByProjectId(uint projectId) public view returns (address) { | ||
| return projects[projectId].wallet; | ||
| } | ||
| } | ||
| } |
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