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// SPDX-License-Identifier: AGPL-3.0-or-later

/// MkrSky.sol -- Mkr/Sky Exchanger

// Copyright (C) 2023 Dai Foundation
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

pragma solidity ^0.8.21;

interface GemLike {
    function burn(address, uint256) external;
    function mint(address, uint256) external;
}

contract MkrSky {
    GemLike public immutable mkr;
    GemLike public immutable sky;
    uint256 public immutable rate;
    
    event MkrToSky(address indexed caller, address indexed usr, uint256 mkrAmt, uint256 skyAmt);
    event SkyToMkr(address indexed caller, address indexed usr, uint256 skyAmt, uint256 mkrAmt);

    constructor(address mkr_, address sky_, uint256 rate_) {
        mkr  = GemLike(mkr_);
        sky  = GemLike(sky_);
        rate = rate_; 
    }

    function mkrToSky(address usr, uint256 mkrAmt) external {
        mkr.burn(msg.sender, mkrAmt);
        uint256 skyAmt = mkrAmt * rate;
        sky.mint(usr, skyAmt);
        emit MkrToSky(msg.sender, usr, mkrAmt, skyAmt);
    }

    function skyToMkr(address usr, uint256 skyAmt) external {
        sky.burn(msg.sender, skyAmt);
        uint256 mkrAmt = skyAmt / rate; // Rounding down, dust will be lost if it is not multiple of rate
        mkr.mint(usr, mkrAmt);
        emit SkyToMkr(msg.sender, usr, skyAmt, mkrAmt);
    }
}

{
  "remappings": [
    "dss-interfaces/=lib/token-tests/lib/dss-test/lib/dss-interfaces/src/",
    "dss-test/=lib/token-tests/lib/dss-test/src/",
    "forge-std/=lib/token-tests/lib/dss-test/lib/forge-std/src/",
    "token-tests/=lib/token-tests/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"mkr_","type":"address"},{"internalType":"address","name":"sky_","type":"address"},{"internalType":"uint256","name":"rate_","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"caller","type":"address"},{"indexed":true,"internalType":"address","name":"usr","type":"address"},{"indexed":false,"internalType":"uint256","name":"mkrAmt","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"skyAmt","type":"uint256"}],"name":"MkrToSky","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"caller","type":"address"},{"indexed":true,"internalType":"address","name":"usr","type":"address"},{"indexed":false,"internalType":"uint256","name":"skyAmt","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"mkrAmt","type":"uint256"}],"name":"SkyToMkr","type":"event"},{"inputs":[],"name":"mkr","outputs":[{"internalType":"contract GemLike","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"mkrAmt","type":"uint256"}],"name":"mkrToSky","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sky","outputs":[{"internalType":"contract GemLike","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"skyAmt","type":"uint256"}],"name":"skyToMkr","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000009f8f72aa9304c8b593d555f12ef6589cc3a579a200000000000000000000000056072c95faa701256059aa122697b133aded92790000000000000000000000000000000000000000000000000000000000005dc0

-----Decoded View---------------
Arg [0] : mkr_ (address): 0x9f8F72aA9304c8B593d555F12eF6589cC3A579A2
Arg [1] : sky_ (address): 0x56072C95FAA701256059aa122697B133aDEd9279
Arg [2] : rate_ (uint256): 24000

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000009f8f72aa9304c8b593d555f12ef6589cc3a579a2
Arg [1] : 00000000000000000000000056072c95faa701256059aa122697b133aded9279
Arg [2] : 0000000000000000000000000000000000000000000000000000000000005dc0