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# @version 0.3.3
"""
@title Boost Delegation V2
@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

event Migrate:
    _token_id: indexed(uint256)


interface BoostV1:
    def ownerOf(_token_id: uint256) -> address: view
    def token_boost(_token_id: uint256) -> int256: view
    def token_expiry(_token_id: uint256) -> uint256: view

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

interface ERC1271:
    def isValidSignature(_hash: bytes32, _signature: Bytes[65]) -> bytes32: 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]) = "v2.0.0"

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

# keccak256("isValidSignature(bytes32,bytes)")[:4] << 224
ERC1271_MAGIC_VAL: constant(bytes32) = 0x1626ba7e00000000000000000000000000000000000000000000000000000000


WEEK: constant(uint256) = 86400 * 7


BOOST_V1: immutable(address)
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]])

migrated: public(HashMap[uint256, bool])


@external
def __init__(_boost_v1: address, _ve: address):
    BOOST_V1 = _boost_v1
    DOMAIN_SEPARATOR = keccak256(_abi_encode(EIP712_TYPEHASH, keccak256(NAME), keccak256(VERSION), chain.id, self))
    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)

@internal
def _migrate(_token_id: uint256):
    assert not self.migrated[_token_id]

    self._boost(
        convert(shift(_token_id, -96), address),  # from
        BoostV1(BOOST_V1).ownerOf(_token_id),  # to
        convert(BoostV1(BOOST_V1).token_boost(_token_id), uint256),  # amount
        BoostV1(BOOST_V1).token_expiry(_token_id),  # expiry
    )

    self.migrated[_token_id] = True
    log Migrate(_token_id)

@external
def migrate(_token_id: uint256):
    self._migrate(_token_id)

@external
def migrate_many(_token_ids: uint256[16]):
    for i in range(16):
        if _token_ids[i] == 0:
            break
        self._migrate(_token_ids[i])

@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 block.timestamp <= _deadline, 'EXPIRED_SIGNATURE'

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

    if _owner.is_contract:
        sig: Bytes[65] = concat(_abi_encode(_r, _s), slice(convert(_v, bytes32), 31, 1))
        # reentrancy not a concern since this is a staticcall
        assert ERC1271(_owner).isValidSignature(digest, sig) == ERC1271_MAGIC_VAL, 'INVALID_SIGNATURE'
    else:
        assert ecrecover(digest, convert(_v, uint256), convert(_r, uint256), convert(_s, uint256)) == _owner and _owner != ZERO_ADDRESS, 'INVALID_SIGNATURE'

    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)


@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 BOOST_V1() -> address:
    return BOOST_V1

@pure
@external
def version() -> String[8]:
    return VERSION

@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"},{"name":"Migrate","inputs":[{"name":"_token_id","type":"uint256","indexed":true}],"anonymous":false,"type":"event"},{"stateMutability":"nonpayable","type":"constructor","inputs":[{"name":"_boost_v1","type":"address"},{"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":"migrate","inputs":[{"name":"_token_id","type":"uint256"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"migrate_many","inputs":[{"name":"_token_ids","type":"uint256[16]"}],"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":"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":"BOOST_V1","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"pure","type":"function","name":"version","inputs":[],"outputs":[{"name":"","type":"string"}]},{"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"}]},{"stateMutability":"view","type":"function","name":"migrated","inputs":[{"name":"arg0","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]}]

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0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000e241c6e48ca045c7f631600a0f1403b2bfea05ad

-----Decoded View---------------
Arg [0] : _boost_v1 (address): 0x0000000000000000000000000000000000000000
Arg [1] : _ve (address): 0xE241C6e48CA045C7f631600a0f1403b2bFea05ad

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [1] : 000000000000000000000000e241c6e48ca045c7f631600a0f1403b2bfea05ad