107 lines
3.2 KiB
Solidity
107 lines
3.2 KiB
Solidity
/*
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Copyright 2020 DODO ZOO.
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SPDX-License-Identifier: Apache-2.0
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*/
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pragma solidity 0.6.9;
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import {SafeMath} from "../lib/SafeMath.sol";
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import {SafeERC20} from "../lib/SafeERC20.sol";
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import {DecimalMath} from "../lib/DecimalMath.sol";
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import {IDVM} from "../DODOVendingMachine/intf/IDVM.sol";
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import {IERC20} from "../intf/IERC20.sol";
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import {InitializableMintableERC20} from "../external/ERC20/InitializableMintableERC20.sol";
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//TODO?：why mintable
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contract Fragment is InitializableMintableERC20 {
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using SafeMath for uint256;
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using SafeERC20 for IERC20;
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// ============ Storage ============
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bool public _IS_BUYOUT_;
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uint256 public _BUYOUT_TIMESTAMP_;
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uint256 public _BUYOUT_PRICE_;
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address public _COLLATERAL_VAULT_;
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address public _QUOTE_;
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address public _DVM_;
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function init(
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address owner,
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address dvm,
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address collateralVault,
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uint256 supply,
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uint256 ownerRatio,
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uint256 buyoutTimestamp
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) external {
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// init local variables
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initOwner(owner);
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_DVM_ = dvm;
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_COLLATERAL_VAULT_ = collateralVault;
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_QUOTE_ = IDVM(_DVM_)._QUOTE_TOKEN_();
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_BUYOUT_TIMESTAMP_ = buyoutTimestamp;
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// init FRAG meta data
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string memory suffix = "FRAG_";
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name = string(abi.encodePacked(suffix, IDVM(_DVM_).addressToShortString(_COLLATERAL_VAULT_)));
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symbol = "FRAG";
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decimals = 18;
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// init FRAG distribution
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totalSupply = supply;
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balances[owner] = DecimalMath.mulFloor(supply, ownerRatio);
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balances[dvm] = supply.sub(balances[owner]);
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emit Transfer(address(0), owner, balances[owner]);
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emit Transfer(address(0), dvm, balances[dvm]);
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// init DVM liquidity
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IDVM(_DVM_).buyShares(address(this));
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}
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//需要先转入QUOTE
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function buyout() external {
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require(!_IS_BUYOUT_, "ALREADY BUYOUT");
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_IS_BUYOUT_ = true;
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_BUYOUT_PRICE_ = IDVM(_DVM_).getMidPrice();
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uint256 requireQuote = DecimalMath.mulCeil(_BUYOUT_PRICE_, totalSupply);
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require(IERC20(_QUOTE_).balanceOf(address(this))>=requireQuote, "QUOTE NOT ENOUGH");
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IDVM(_DVM_).sellShares(
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IERC20(_DVM_).balanceOf(address(this)),
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address(this),
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0,
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0,
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"",
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uint256(-1)
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);
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uint256 ownerQuote = DecimalMath.mulFloor(_BUYOUT_PRICE_, balances[address(this)]);
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_clearSelfBalance();
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IERC20(_QUOTE_).safeTransfer(_OWNER_, ownerQuote);
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}
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// buyout之后的恒定兑换，需要先转入FRAG
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function redeem(address to) external {
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require(_IS_BUYOUT_, "NEED BUYOUT");
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IERC20(_QUOTE_).safeTransfer(to, DecimalMath.mulFloor(_BUYOUT_PRICE_, balances[address(this)]));
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_clearSelfBalance();
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}
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function getBuyoutRequirement() external view returns (uint256 requireQuote){
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require(!_IS_BUYOUT_, "ALREADY BUYOUT");
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uint256 price = IDVM(_DVM_).getMidPrice();
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requireQuote = DecimalMath.mulCeil(price, totalSupply);
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}
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function _clearSelfBalance() internal {
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emit Transfer(address(this), address(0), balances[address(this)]);
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balances[address(this)] = 0;
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}
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}
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