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// SPDX-License-Identifier: MIT
pragma solidity ^0.7.1;

import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Votes.sol";

contract DTRASH is ERC20Votes {
    uint256 public constant VESTING_DURATION = 730 days;
    uint256 public constant UNLOCK_START = 365 days;
    uint256 public unlockTime;
    mapping(address => uint256) private _lockedBalances;

constructor(address[] memory lockedRecipients, uint256[] memory lockedAmounts, address[] memory unlockedRecipients, uint256[] memory unlockedAmounts) ERC20Votes("DecentTrash", "DTRASH") {
        require(lockedRecipients.length == lockedAmounts.length, "Mismatched locked");
        require(unlockedRecipients.length == unlockedAmounts.length, "Mismatched unlocked");
        unlockTime = block.timestamp + UNLOCK_START;

for(uint i = 0; i < lockedRecipients.length; i++) {
            _mintAndLock(lockedRecipients[i], lockedAmounts[i]);
        }

for(uint i = 0; i < unlockedRecipients.length; i++) {
            _mint(unlockedRecipients[i], unlockedAmounts[i]);
        }
    }

function _mintAndLock(address to, uint256 amount) internal {
        _mint(to, amount);
        _lockedBalances[to] += amount;
    }

function _beforeTokenTransfer(address from, address to, uint256 amount) internal override {
        super._beforeTokenTransfer(from, to, amount);

if (from != address(0) && to != address(0)) { // not mint or burn
            if (_lockedBalances[from] > 0) { // address has locked tokens
                require(block.timestamp >= unlockTime, "Tokens are locked");

if (block.timestamp < unlockTime + VESTING_DURATION) { // if we are still within vesting period, check xfer amt
                    uint256 timeIntoVesting = block.timestamp - unlockTime;
                    uint256 vestedAmount = (_lockedBalances[from] * timeIntoVesting) / VESTING_DURATION;
                    require(balanceOf(from) - amount >= _lockedBalances[from] - vestedAmount, "Exceeds vested amount");
                }
            }
        }
    }
}