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/**
 *Submitted for verification at uniscan.xyz on 2025-09-18
*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract DailyStreak {
    mapping(address => uint256) public streaks; // Streak hiện tại của user
    mapping(address => uint256) public lastCheckIn; // Timestamp check-in cuối

    event CheckedIn(address user, uint256 newStreak);

    function checkIn() public {
        uint256 currentTime = block.timestamp;
        uint256 lastTime = lastCheckIn[msg.sender];
        
        // Tính khoảng cách ngày (giả sử 1 ngày = 86400 giây)
        if (lastTime == 0) {
            // Lần đầu check-in
            streaks[msg.sender] = 1;
        } else {
            uint256 daysPassed = (currentTime - lastTime) / 86400;
            
            if (daysPassed == 1) {
                // Tiếp tục streak
                streaks[msg.sender] += 1;
            } else if (daysPassed > 1) {
                // Reset streak
                streaks[msg.sender] = 1;
            } else {
                // Đã check-in hôm nay, không thay đổi
                return;
            }
        }
        
        lastCheckIn[msg.sender] = currentTime;
        emit CheckedIn(msg.sender, streaks[msg.sender]);
    }

    function getStreak(address user) public view returns (uint256) {
        return streaks[user];
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"newStreak","type":"uint256"}],"name":"CheckedIn","type":"event"},{"inputs":[],"name":"checkIn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"getStreak","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"lastCheckIn","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"streaks","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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