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# @version 0.3.10
"""
@title Boost Delegation V3
@author CurveFi
"""

event Approval:
    _owner: indexed(address)
    _spender: indexed(address)
    _value: uint256

event Transfer:
    _from: indexed(address)
    _to: indexed(address)
    _value: uint256

event Boost:
    _from: indexed(address)
    _to: indexed(address)
    _bias: uint256
    _slope: uint256
    _start: uint256

interface VotingEscrow:
    def balanceOf(_user: address) -> uint256: view
    def totalSupply() -> uint256: view
    def locked__end(_user: address) -> uint256: view


struct Point:
    bias: uint256
    slope: uint256
    ts: uint256


NAME: constant(String[32]) = "Vote-Escrowed Boost"
SYMBOL: constant(String[8]) = "veBoost"
VERSION: constant(String[8]) = "v3.0.0"

EIP712_TYPEHASH: constant(bytes32) = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract,bytes32 salt)")
PERMIT_TYPEHASH: constant(bytes32) = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)")

WEEK: constant(uint256) = 86400 * 7


DOMAIN_SEPARATOR: immutable(bytes32)
VE: immutable(address)


allowance: public(HashMap[address, HashMap[address, uint256]])
nonces: public(HashMap[address, uint256])

delegated: public(HashMap[address, Point])
delegated_slope_changes: public(HashMap[address, HashMap[uint256, uint256]])

received: public(HashMap[address, Point])
received_slope_changes: public(HashMap[address, HashMap[uint256, uint256]])

@external
def __init__(_ve: address):
    DOMAIN_SEPARATOR = keccak256(_abi_encode(EIP712_TYPEHASH, keccak256(NAME), keccak256(VERSION), chain.id, self, block.prevhash))
    VE = _ve

    log Transfer(ZERO_ADDRESS, msg.sender, 0)


@view
@internal
def _checkpoint_read(_user: address, _delegated: bool) -> Point:
    point: Point = empty(Point)

    if _delegated:
        point = self.delegated[_user]
    else:
        point = self.received[_user]

    if point.ts == 0:
        point.ts = block.timestamp

    if point.ts == block.timestamp:
        return point

    ts: uint256 = (point.ts / WEEK) * WEEK
    for _ in range(255):
        ts += WEEK

        dslope: uint256 = 0
        if block.timestamp < ts:
            ts = block.timestamp
        else:
            if _delegated:
                dslope = self.delegated_slope_changes[_user][ts]
            else:
                dslope = self.received_slope_changes[_user][ts]

        point.bias -= point.slope * (ts - point.ts)
        point.slope -= dslope
        point.ts = ts

        if ts == block.timestamp:
            break

    return point


@internal
def _checkpoint_write(_user: address, _delegated: bool) -> Point:
    point: Point = empty(Point)

    if _delegated:
        point = self.delegated[_user]
    else:
        point = self.received[_user]

    if point.ts == 0:
        point.ts = block.timestamp

    if point.ts == block.timestamp:
        return point

    dbias: uint256 = 0
    ts: uint256 = (point.ts / WEEK) * WEEK
    for _ in range(255):
        ts += WEEK

        dslope: uint256 = 0
        if block.timestamp < ts:
            ts = block.timestamp
        else:
            if _delegated:
                dslope = self.delegated_slope_changes[_user][ts]
            else:
                dslope = self.received_slope_changes[_user][ts]

        amount: uint256 = point.slope * (ts - point.ts)

        dbias += amount
        point.bias -= amount
        point.slope -= dslope
        point.ts = ts

        if ts == block.timestamp:
            break

    if _delegated == False and dbias != 0:  # received boost
        log Transfer(_user, ZERO_ADDRESS, dbias)

    return point


@view
@internal
def _balance_of(_user: address) -> uint256:
    amount: uint256 = VotingEscrow(VE).balanceOf(_user)

    point: Point = self._checkpoint_read(_user, True)
    amount -= (point.bias - point.slope * (block.timestamp - point.ts))

    point = self._checkpoint_read(_user, False)
    amount += (point.bias - point.slope * (block.timestamp - point.ts))
    return amount


@internal
def _boost(_from: address, _to: address, _amount: uint256, _endtime: uint256):
    assert _to not in [_from, ZERO_ADDRESS]
    assert _amount != 0
    assert _endtime > block.timestamp
    assert _endtime % WEEK == 0
    assert _endtime <= VotingEscrow(VE).locked__end(_from)

    # checkpoint delegated point
    point: Point = self._checkpoint_write(_from, True)
    assert _amount <= VotingEscrow(VE).balanceOf(_from) - (point.bias - point.slope * (block.timestamp - point.ts))

    # calculate slope and bias being added
    slope: uint256 = _amount / (_endtime - block.timestamp)
    bias: uint256 = slope * (_endtime - block.timestamp)

    # update delegated point
    point.bias += bias
    point.slope += slope

    # store updated values
    self.delegated[_from] = point
    self.delegated_slope_changes[_from][_endtime] += slope

    # update received amount
    point = self._checkpoint_write(_to, False)
    point.bias += bias
    point.slope += slope

    # store updated values
    self.received[_to] = point
    self.received_slope_changes[_to][_endtime] += slope

    log Transfer(_from, _to, _amount)
    log Boost(_from, _to, bias, slope, block.timestamp)

    # also checkpoint received and delegated
    self.received[_from] = self._checkpoint_write(_from, False)
    self.delegated[_to] = self._checkpoint_write(_to, True)


@external
def boost(_to: address, _amount: uint256, _endtime: uint256, _from: address = msg.sender):
    # reduce approval if necessary
    if _from != msg.sender:
        allowance: uint256 = self.allowance[_from][msg.sender]
        if allowance != MAX_UINT256:
            self.allowance[_from][msg.sender] = allowance - _amount
            log Approval(_from, msg.sender, allowance - _amount)

    self._boost(_from, _to, _amount, _endtime)


@external
def checkpoint_user(_user: address):
    self.delegated[_user] = self._checkpoint_write(_user, True)
    self.received[_user] = self._checkpoint_write(_user, False)


@external
def approve(_spender: address, _value: uint256) -> bool:
    self.allowance[msg.sender][_spender] = _value

    log Approval(msg.sender, _spender, _value)
    return True


@external
def permit(_owner: address, _spender: address, _value: uint256, _deadline: uint256, _v: uint8, _r: bytes32, _s: bytes32) -> bool:
    assert _owner != ZERO_ADDRESS
    assert block.timestamp <= _deadline

    nonce: uint256 = self.nonces[_owner]
    digest: bytes32 = keccak256(
        concat(
            b"\x19\x01",
            DOMAIN_SEPARATOR,
            keccak256(_abi_encode(PERMIT_TYPEHASH, _owner, _spender, _value, nonce, _deadline))
        )
    )

    assert ecrecover(digest, convert(_v, uint256), convert(_r, uint256), convert(_s, uint256)) == _owner

    self.allowance[_owner][_spender] = _value
    self.nonces[_owner] = nonce + 1

    log Approval(_owner, _spender, _value)
    return True


@external
def increaseAllowance(_spender: address, _added_value: uint256) -> bool:
    allowance: uint256 = self.allowance[msg.sender][_spender] + _added_value
    self.allowance[msg.sender][_spender] = allowance

    log Approval(msg.sender, _spender, allowance)
    return True


@external
def decreaseAllowance(_spender: address, _subtracted_value: uint256) -> bool:
    allowance: uint256 = self.allowance[msg.sender][_spender] - _subtracted_value
    self.allowance[msg.sender][_spender] = allowance

    log Approval(msg.sender, _spender, allowance)
    return True


@view
@external
def balanceOf(_user: address) -> uint256:
    return self._balance_of(_user)


@view
@external
def adjusted_balance_of(_user: address) -> uint256:
    return self._balance_of(_user)


@external
def adjusted_balance_of_write(_user: address) -> uint256:
    amount: uint256 = VotingEscrow(VE).balanceOf(_user)

    point: Point = self._checkpoint_write(_user, True)
    self.delegated[_user] = point
    amount -= (point.bias - point.slope * (block.timestamp - point.ts))

    point = self._checkpoint_write(_user, False)
    self.received[_user] = point
    amount += (point.bias - point.slope * (block.timestamp - point.ts))

    return amount

@view
@external
def totalSupply() -> uint256:
    return VotingEscrow(VE).totalSupply()


@view
@external
def delegated_balance(_user: address) -> uint256:
    point: Point = self._checkpoint_read(_user, True)
    return point.bias - point.slope * (block.timestamp - point.ts)


@view
@external
def received_balance(_user: address) -> uint256:
    point: Point = self._checkpoint_read(_user, False)
    return point.bias - point.slope * (block.timestamp - point.ts)


@view
@external
def delegable_balance(_user: address) -> uint256:
    point: Point = self._checkpoint_read(_user, True)
    return VotingEscrow(VE).balanceOf(_user) - (point.bias - point.slope * (block.timestamp - point.ts))


@pure
@external
def name() -> String[32]:
    return NAME


@pure
@external
def symbol() -> String[8]:
    return SYMBOL


@pure
@external
def decimals() -> uint8:
    return 18


@pure
@external
def DOMAIN_SEPARATOR() -> bytes32:
    return DOMAIN_SEPARATOR


@pure
@external
def VE() -> address:
    return VE

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[{"name":"Approval","inputs":[{"name":"_owner","type":"address","indexed":true},{"name":"_spender","type":"address","indexed":true},{"name":"_value","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"Transfer","inputs":[{"name":"_from","type":"address","indexed":true},{"name":"_to","type":"address","indexed":true},{"name":"_value","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"Boost","inputs":[{"name":"_from","type":"address","indexed":true},{"name":"_to","type":"address","indexed":true},{"name":"_bias","type":"uint256","indexed":false},{"name":"_slope","type":"uint256","indexed":false},{"name":"_start","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"stateMutability":"nonpayable","type":"constructor","inputs":[{"name":"_ve","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"boost","inputs":[{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"},{"name":"_endtime","type":"uint256"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"boost","inputs":[{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"},{"name":"_endtime","type":"uint256"},{"name":"_from","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"checkpoint_user","inputs":[{"name":"_user","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"approve","inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"permit","inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"},{"name":"_deadline","type":"uint256"},{"name":"_v","type":"uint8"},{"name":"_r","type":"bytes32"},{"name":"_s","type":"bytes32"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"increaseAllowance","inputs":[{"name":"_spender","type":"address"},{"name":"_added_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"decreaseAllowance","inputs":[{"name":"_spender","type":"address"},{"name":"_subtracted_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"view","type":"function","name":"balanceOf","inputs":[{"name":"_user","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"adjusted_balance_of","inputs":[{"name":"_user","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"nonpayable","type":"function","name":"adjusted_balance_of_write","inputs":[{"name":"_user","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"totalSupply","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"delegated_balance","inputs":[{"name":"_user","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"received_balance","inputs":[{"name":"_user","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"delegable_balance","inputs":[{"name":"_user","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"pure","type":"function","name":"name","inputs":[],"outputs":[{"name":"","type":"string"}]},{"stateMutability":"pure","type":"function","name":"symbol","inputs":[],"outputs":[{"name":"","type":"string"}]},{"stateMutability":"pure","type":"function","name":"decimals","inputs":[],"outputs":[{"name":"","type":"uint8"}]},{"stateMutability":"pure","type":"function","name":"DOMAIN_SEPARATOR","inputs":[],"outputs":[{"name":"","type":"bytes32"}]},{"stateMutability":"pure","type":"function","name":"VE","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"allowance","inputs":[{"name":"arg0","type":"address"},{"name":"arg1","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"nonces","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"delegated","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"tuple","components":[{"name":"bias","type":"uint256"},{"name":"slope","type":"uint256"},{"name":"ts","type":"uint256"}]}]},{"stateMutability":"view","type":"function","name":"delegated_slope_changes","inputs":[{"name":"arg0","type":"address"},{"name":"arg1","type":"uint256"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"received","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"tuple","components":[{"name":"bias","type":"uint256"},{"name":"slope","type":"uint256"},{"name":"ts","type":"uint256"}]}]},{"stateMutability":"view","type":"function","name":"received_slope_changes","inputs":[{"name":"arg0","type":"address"},{"name":"arg1","type":"uint256"}],"outputs":[{"name":"","type":"uint256"}]}]

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