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

import "contracts/interfaces/IStratum.sol";

contract Stratum is IStratum {
  string public constant name = "Stratum";
  string public constant symbol = "STRAT";
  uint8 public constant decimals = 18;
  uint public totalSupply = 0;
  uint public remainingClaimCap = 6_250_000 * 1e18;

  mapping(address => uint) public balanceOf;
  mapping(address => mapping(address => uint)) public allowance;

  bool public initialMinted;
  address public minter;
  address public redemptionReceiver;
  address public merkleClaim;

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

  constructor() {
    minter = msg.sender;
  }

  // No checks as its meant to be once off to set minting rights to BaseV1 Minter
  function setMinter(address _minter) external {
    require(msg.sender == minter);
    minter = _minter;
  }

  function setRedemptionReceiver(address _receiver) external {
    require(msg.sender == minter);
    redemptionReceiver = _receiver;
  }

  function setMerkleClaim(address _merkleClaim) external {
    require(msg.sender == minter);
    merkleClaim = _merkleClaim;
  }

  // Initial mint: total 25M
  function initialMint(address _recipient) external {
    require(msg.sender == minter && !initialMinted);
    initialMinted = true;
    _mint(_recipient, 18_750_000 * 1e18);
  }

  function approve(address _spender, uint _value) external returns (bool) {
    allowance[msg.sender][_spender] = _value;
    emit Approval(msg.sender, _spender, _value);
    return true;
  }

  function _mint(address _to, uint _amount) internal returns (bool) {
    totalSupply += _amount;
    unchecked {
      balanceOf[_to] += _amount;
    }
    emit Transfer(address(0x0), _to, _amount);
    return true;
  }

  function _transfer(
    address _from,
    address _to,
    uint _value
  ) internal returns (bool) {
    balanceOf[_from] -= _value;
    unchecked {
      balanceOf[_to] += _value;
    }
    if (_to == address(0)) {
      totalSupply -= _value;
    }
    emit Transfer(_from, _to, _value);
    return true;
  }

  function transfer(address _to, uint _value) external returns (bool) {
    return _transfer(msg.sender, _to, _value);
  }

  function transferFrom(
    address _from,
    address _to,
    uint _value
  ) external returns (bool) {
    uint allowed_from = allowance[_from][msg.sender];
    if (allowed_from != type(uint).max) {
      allowance[_from][msg.sender] -= _value;
    }
    return _transfer(_from, _to, _value);
  }

  function mint(address account, uint amount) external returns (bool) {
    require(msg.sender == minter);
    _mint(account, amount);
    return true;
  }

  function claim(address account, uint amount) external returns (bool) {
    require(remainingClaimCap > 0, "minting exhausted");
    require(msg.sender == redemptionReceiver || msg.sender == merkleClaim);
    if (amount > remainingClaimCap) {
      // handle possible rounding artifacts
      amount = remainingClaimCap;
    }
    remainingClaimCap -= amount;
    _mint(account, amount);
    return true;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

interface IStratum {
  function totalSupply() external view returns (uint);

  function balanceOf(address) external view returns (uint);

  function approve(address spender, uint value) external returns (bool);

  function transfer(address, uint) external returns (bool);

  function transferFrom(address, address, uint) external returns (bool);

  function mint(address, uint) external returns (bool);

  function minter() external returns (address);

  function claim(address, uint) external returns (bool);
}

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

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