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// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.13;

import 'contracts/libraries/Math.sol';
import 'contracts/interfaces/IERC20.sol';
import 'contracts/interfaces/IRewardsDistributor.sol';
import 'contracts/interfaces/IVotingEscrow.sol';

/*

@title Curve Fee Distribution modified for ve(3,3) emissions
@author Curve Finance, andrecronje
@license MIT

*/

contract RewardsDistributor is IRewardsDistributor {

    event CheckpointToken(
        uint time,
        uint tokens
    );

    event Claimed(
        uint tokenId,
        uint amount,
        uint claim_epoch,
        uint max_epoch
    );

    uint constant WEEK = 7 * 86400;

    uint public start_time;
    uint public time_cursor;
    mapping(uint => uint) public time_cursor_of;
    mapping(uint => uint) public user_epoch_of;

    uint public last_token_time;
    uint[1000000000000000] public tokens_per_week;

    address public voting_escrow;
    address public token;
    uint public token_last_balance;

    uint[1000000000000000] public ve_supply;

    address public depositor;

    constructor(address _voting_escrow) {
        uint _t = block.timestamp / WEEK * WEEK;
        start_time = _t;
        last_token_time = _t;
        time_cursor = _t;
        address _token = IVotingEscrow(_voting_escrow).token();
        token = _token;
        voting_escrow = _voting_escrow;
        depositor = msg.sender;
        require(IERC20(_token).approve(_voting_escrow, type(uint).max));
    }

    function timestamp() external view returns (uint) {
        return block.timestamp / WEEK * WEEK;
    }

    function _checkpoint_token() internal {
        uint token_balance = IERC20(token).balanceOf(address(this));
        uint to_distribute = token_balance - token_last_balance;
        token_last_balance = token_balance;

        uint t = last_token_time;
        uint since_last = block.timestamp - t;
        last_token_time = block.timestamp;
        uint this_week = t / WEEK * WEEK;
        uint next_week = 0;

        for (uint i = 0; i < 20; i++) {
            next_week = this_week + WEEK;
            if (block.timestamp < next_week) {
                if (since_last == 0 && block.timestamp == t) {
                    tokens_per_week[this_week] += to_distribute;
                } else {
                    tokens_per_week[this_week] += to_distribute * (block.timestamp - t) / since_last;
                }
                break;
            } else {
                if (since_last == 0 && next_week == t) {
                    tokens_per_week[this_week] += to_distribute;
                } else {
                    tokens_per_week[this_week] += to_distribute * (next_week - t) / since_last;
                }
            }
            t = next_week;
            this_week = next_week;
        }
        emit CheckpointToken(block.timestamp, to_distribute);
    }

    function checkpoint_token() external {
        assert(msg.sender == depositor);
        _checkpoint_token();
    }

    function _find_timestamp_epoch(address ve, uint _timestamp) internal view returns (uint) {
        uint _min = 0;
        uint _max = IVotingEscrow(ve).epoch();
        for (uint i = 0; i < 128; i++) {
            if (_min >= _max) break;
            uint _mid = (_min + _max + 2) / 2;
            IVotingEscrow.Point memory pt = IVotingEscrow(ve).point_history(_mid);
            if (pt.ts <= _timestamp) {
                _min = _mid;
            } else {
                _max = _mid - 1;
            }
        }
        return _min;
    }

    function _find_timestamp_user_epoch(address ve, uint tokenId, uint _timestamp, uint max_user_epoch) internal view returns (uint) {
        uint _min = 0;
        uint _max = max_user_epoch;
        for (uint i = 0; i < 128; i++) {
            if (_min >= _max) break;
            uint _mid = (_min + _max + 2) / 2;
            IVotingEscrow.Point memory pt = IVotingEscrow(ve).user_point_history(tokenId, _mid);
            if (pt.ts <= _timestamp) {
                _min = _mid;
            } else {
                _max = _mid -1;
            }
        }
        return _min;
    }

    function ve_for_at(uint _tokenId, uint _timestamp) external view returns (uint) {
        address ve = voting_escrow;
        uint max_user_epoch = IVotingEscrow(ve).user_point_epoch(_tokenId);
        uint epoch = _find_timestamp_user_epoch(ve, _tokenId, _timestamp, max_user_epoch);
        IVotingEscrow.Point memory pt = IVotingEscrow(ve).user_point_history(_tokenId, epoch);
        return Math.max(uint(int256(pt.bias - pt.slope * (int128(int256(_timestamp - pt.ts))))), 0);
    }

    function _checkpoint_total_supply() internal {
        address ve = voting_escrow;
        uint t = time_cursor;
        uint rounded_timestamp = block.timestamp / WEEK * WEEK;
        IVotingEscrow(ve).checkpoint();

        for (uint i = 0; i < 20; i++) {
            if (t > rounded_timestamp) {
                break;
            } else {
                uint epoch = _find_timestamp_epoch(ve, t);
                IVotingEscrow.Point memory pt = IVotingEscrow(ve).point_history(epoch);
                int128 dt = 0;
                if (t > pt.ts) {
                    dt = int128(int256(t - pt.ts));
                }
                ve_supply[t] = Math.max(uint(int256(pt.bias - pt.slope * dt)), 0);
            }
            t += WEEK;
        }
        time_cursor = t;
    }

    function checkpoint_total_supply() external {
        _checkpoint_total_supply();
    }

    function _claim(uint _tokenId, address ve, uint _last_token_time) internal returns (uint) {
        uint user_epoch = 0;
        uint to_distribute = 0;

        uint max_user_epoch = IVotingEscrow(ve).user_point_epoch(_tokenId);
        uint _start_time = start_time;

        if (max_user_epoch == 0) return 0;

        uint week_cursor = time_cursor_of[_tokenId];
        if (week_cursor == 0) {
            user_epoch = _find_timestamp_user_epoch(ve, _tokenId, _start_time, max_user_epoch);
        } else {
            user_epoch = user_epoch_of[_tokenId];
        }

        if (user_epoch == 0) user_epoch = 1;

        IVotingEscrow.Point memory user_point = IVotingEscrow(ve).user_point_history(_tokenId, user_epoch);

        if (week_cursor == 0) week_cursor = (user_point.ts + WEEK - 1) / WEEK * WEEK;
        if (week_cursor >= last_token_time) return 0;
        if (week_cursor < _start_time) week_cursor = _start_time;

        IVotingEscrow.Point memory old_user_point;

        for (uint i = 0; i < 50; i++) {
            if (week_cursor >= _last_token_time) break;

            if (week_cursor >= user_point.ts && user_epoch <= max_user_epoch) {
                user_epoch += 1;
                old_user_point = user_point;
                if (user_epoch > max_user_epoch) {
                    user_point = IVotingEscrow.Point(0,0,0,0);
                } else {
                    user_point = IVotingEscrow(ve).user_point_history(_tokenId, user_epoch);
                }
            } else {
                int128 dt = int128(int256(week_cursor - old_user_point.ts));
                uint balance_of = Math.max(uint(int256(old_user_point.bias - dt * old_user_point.slope)), 0);
                if (balance_of == 0 && user_epoch > max_user_epoch) break;
                if (balance_of != 0) {
                    to_distribute += balance_of * tokens_per_week[week_cursor] / ve_supply[week_cursor];
                }
                week_cursor += WEEK;
            }
        }

        user_epoch = Math.min(max_user_epoch, user_epoch - 1);
        user_epoch_of[_tokenId] = user_epoch;
        time_cursor_of[_tokenId] = week_cursor;

        emit Claimed(_tokenId, to_distribute, user_epoch, max_user_epoch);

        return to_distribute;
    }

    function _claimable(uint _tokenId, address ve, uint _last_token_time) internal view returns (uint) {
        uint user_epoch = 0;
        uint to_distribute = 0;

        uint max_user_epoch = IVotingEscrow(ve).user_point_epoch(_tokenId);
        uint _start_time = start_time;

        if (max_user_epoch == 0) return 0;

        uint week_cursor = time_cursor_of[_tokenId];
        if (week_cursor == 0) {
            user_epoch = _find_timestamp_user_epoch(ve, _tokenId, _start_time, max_user_epoch);
        } else {
            user_epoch = user_epoch_of[_tokenId];
        }

        if (user_epoch == 0) user_epoch = 1;

        IVotingEscrow.Point memory user_point = IVotingEscrow(ve).user_point_history(_tokenId, user_epoch);

        if (week_cursor == 0) week_cursor = (user_point.ts + WEEK - 1) / WEEK * WEEK;
        if (week_cursor >= last_token_time) return 0;
        if (week_cursor < _start_time) week_cursor = _start_time;

        IVotingEscrow.Point memory old_user_point;

        for (uint i = 0; i < 50; i++) {
            if (week_cursor >= _last_token_time) break;

            if (week_cursor >= user_point.ts && user_epoch <= max_user_epoch) {
                user_epoch += 1;
                old_user_point = user_point;
                if (user_epoch > max_user_epoch) {
                    user_point = IVotingEscrow.Point(0,0,0,0);
                } else {
                    user_point = IVotingEscrow(ve).user_point_history(_tokenId, user_epoch);
                }
            } else {
                int128 dt = int128(int256(week_cursor - old_user_point.ts));
                uint balance_of = Math.max(uint(int256(old_user_point.bias - dt * old_user_point.slope)), 0);
                if (balance_of == 0 && user_epoch > max_user_epoch) break;
                if (balance_of != 0) {
                    to_distribute += balance_of * tokens_per_week[week_cursor] / ve_supply[week_cursor];
                }
                week_cursor += WEEK;
            }
        }

        return to_distribute;
    }

    function claimable(uint _tokenId) external view returns (uint) {
        uint _last_token_time = last_token_time / WEEK * WEEK;
        return _claimable(_tokenId, voting_escrow, _last_token_time);
    }

    function claim(uint _tokenId) external returns (uint) {
        if (block.timestamp >= time_cursor) _checkpoint_total_supply();
        uint _last_token_time = last_token_time;
        _last_token_time = _last_token_time / WEEK * WEEK;
        uint amount = _claim(_tokenId, voting_escrow, _last_token_time);
        if (amount != 0) {
            IVotingEscrow(voting_escrow).deposit_for(_tokenId, amount);
            token_last_balance -= amount;
        }
        return amount;
    }

    function claim_many(uint[] memory _tokenIds) external returns (bool) {
        if (block.timestamp >= time_cursor) _checkpoint_total_supply();
        uint _last_token_time = last_token_time;
        _last_token_time = _last_token_time / WEEK * WEEK;
        address _voting_escrow = voting_escrow;
        uint total = 0;

        for (uint i = 0; i < _tokenIds.length; i++) {
            uint _tokenId = _tokenIds[i];
            if (_tokenId == 0) break;
            uint amount = _claim(_tokenId, _voting_escrow, _last_token_time);
            if (amount != 0) {
                IVotingEscrow(_voting_escrow).deposit_for(_tokenId, amount);
                total += amount;
            }
        }
        if (total != 0) {
            token_last_balance -= total;
        }

        return true;
    }

    // Once off event on contract initialize
    function setDepositor(address _depositor) external {
        require(msg.sender == depositor);
        depositor = _depositor;
    }
}

pragma solidity 0.8.13;

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function transfer(address recipient, uint amount) external returns (bool);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function balanceOf(address) external view returns (uint);
    function transferFrom(address sender, address recipient, uint amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint value) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
}

pragma solidity 0.8.13;

interface IRewardsDistributor {
    function checkpoint_token() external;
    function checkpoint_total_supply() external;
}

pragma solidity 0.8.13;

interface IVotingEscrow {

    struct Point {
        int128 bias;
        int128 slope; // # -dweight / dt
        uint256 ts;
        uint256 blk; // block
    }

    function token() external view returns (address);
    function team() external returns (address);
    function epoch() external view returns (uint);
    function point_history(uint loc) external view returns (Point memory);
    function user_point_history(uint tokenId, uint loc) external view returns (Point memory);
    function user_point_epoch(uint tokenId) external view returns (uint);

    function ownerOf(uint) external view returns (address);
    function isApprovedOrOwner(address, uint) external view returns (bool);
    function transferFrom(address, address, uint) external;

    function voting(uint tokenId) external;
    function abstain(uint tokenId) external;
    function attach(uint tokenId) external;
    function detach(uint tokenId) external;

    function checkpoint() external;
    function deposit_for(uint tokenId, uint value) external;
    function create_lock_for(uint, uint, address) external returns (uint);

    function balanceOfNFT(uint) external view returns (uint);
    function totalSupply() external view returns (uint);
}

pragma solidity 0.8.13;

library Math {
    function max(uint a, uint b) internal pure returns (uint) {
        return a >= b ? a : b;
    }
    function min(uint a, uint b) internal pure returns (uint) {
        return a < b ? a : b;
    }
    function sqrt(uint y) internal pure returns (uint z) {
        if (y > 3) {
            z = y;
            uint x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
    function cbrt(uint256 n) internal pure returns (uint256) { unchecked {
        uint256 x = 0;
        for (uint256 y = 1 << 255; y > 0; y >>= 3) {
            x <<= 1;
            uint256 z = 3 * x * (x + 1) + 1;
            if (n / y >= z) {
                n -= y * z;
                x += 1;
            }
        }
        return x;
    }}
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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0000000000000000000000006c4a102b7aaffa9a8c9440c08a5c09deecafb324

-----Decoded View---------------
Arg [0] : _voting_escrow (address): 0x6c4A102B7aafFA9a8C9440c08A5c09deECAFB324

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000006c4a102b7aaffa9a8c9440c08a5c09deecafb324