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# @version 0.3.1
"""
@title Token Minter
@author Curve Finance
@license MIT
"""

# Original idea and credit:
# Curve Finance's Token Minter
# https://resources.curve.fi/base-features/understanding-gauges
# https://github.com/curvefi/curve-dao-contracts/blob/master/contracts/Minter.vy
# This contract is an almost-identical fork of Curve's contract

interface LiquidityGauge:
    # Presumably, other gauges will provide the same interfaces
    def integrate_fraction(addr: address) -> uint256: view
    def user_checkpoint(addr: address) -> bool: nonpayable

interface MERC20:
    def mint(_to: address, _value: uint256) -> bool: nonpayable

interface GaugeController:
    def gauge_types(addr: address) -> int128: view


event Minted:
    recipient: indexed(address)
    gauge: address
    minted: uint256


token: public(address)
controller: public(address)

# user -> gauge -> value
minted: public(HashMap[address, HashMap[address, uint256]])

# minter -> user -> can mint?
allowed_to_mint_for: public(HashMap[address, HashMap[address, bool]])


@external
def __init__(_token: address, _controller: address):
    self.token = _token
    self.controller = _controller


@internal
def _mint_for(gauge_addr: address, _for: address):
    assert GaugeController(self.controller).gauge_types(gauge_addr) >= 0  # dev: gauge is not added

    LiquidityGauge(gauge_addr).user_checkpoint(_for)
    total_mint: uint256 = LiquidityGauge(gauge_addr).integrate_fraction(_for)
    to_mint: uint256 = total_mint - self.minted[_for][gauge_addr]

    if to_mint != 0:
        MERC20(self.token).mint(_for, to_mint)
        self.minted[_for][gauge_addr] = total_mint

        log Minted(_for, gauge_addr, total_mint)


@external
@nonreentrant('lock')
def mint(gauge_addr: address):
    """
    @notice Mint everything which belongs to `msg.sender` and send to them
    @param gauge_addr `LiquidityGauge` address to get mintable amount from
    """
    self._mint_for(gauge_addr, msg.sender)


@external
@nonreentrant('lock')
def mint_many(gauge_addrs: address[8]):
    """
    @notice Mint everything which belongs to `msg.sender` across multiple gauges
    @param gauge_addrs List of `LiquidityGauge` addresses
    """
    for i in range(8):
        if gauge_addrs[i] == ZERO_ADDRESS:
            break
        self._mint_for(gauge_addrs[i], msg.sender)


@external
@nonreentrant('lock')
def mint_for(gauge_addr: address, _for: address):
    """
    @notice Mint tokens for `_for`
    @dev Only possible when `msg.sender` has been approved via `toggle_approve_mint`
    @param gauge_addr `LiquidityGauge` address to get mintable amount from
    @param _for Address to mint to
    """
    if self.allowed_to_mint_for[msg.sender][_for]:
        self._mint_for(gauge_addr, _for)


@external
def toggle_approve_mint(minting_user: address):
    """
    @notice allow `minting_user` to mint for `msg.sender`
    @param minting_user Address to toggle permission for
    """
    self.allowed_to_mint_for[minting_user][msg.sender] = not self.allowed_to_mint_for[minting_user][msg.sender]

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00000000000000000000000072953a5c32413614d24c29c84a66ae4b59581bbf000000000000000000000000b992e8e1943f40f89301ab89a5c254f567af5b63

-----Decoded View---------------
Arg [0] : _token (address): 0x72953a5C32413614d24C29c84a66AE4B59581Bbf
Arg [1] : _controller (address): 0xB992E8E1943f40f89301aB89A5C254F567aF5b63

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 00000000000000000000000072953a5c32413614d24c29c84a66ae4b59581bbf
Arg [1] : 000000000000000000000000b992e8e1943f40f89301ab89a5c254f567af5b63