name: 'Setup Node.js environment'
description: 'Setup a Node.js environment by adding problem matchers and optionally downloading and adding it to the PATH.'
author: 'GitHub'
inputs:
  node-version:
    description: 'Version Spec of the version to use. Examples: 12.x, 10.15.1, >=10.15.0.'
  node-version-file:
    description: 'File containing the version Spec of the version to use.  Examples: package.json, .nvmrc, .node-version, .tool-versions.'
  architecture:
    description: 'Target architecture for Node to use. Examples: x86, x64. Will use system architecture by default.'
  check-latest:
    description: 'Set this option if you want the action to check for the latest available version that satisfies the version spec.'
    default: false
  registry-url:
    description: 'Optional registry to set up for auth. Will set the registry in a project level .npmrc and .yarnrc file, and set up auth to read in from env.NODE_AUTH_TOKEN.'
  scope:
    description: 'Optional scope for authenticating against scoped registries. Will fall back to the repository owner when using the GitHub Packages registry (https://npm.pkg.github.com/).'
  token:
    description: Used to pull node distributions from node-versions. Since there's a default, this is typically not supplied by the user. When running this action on github.com, the default value is sufficient. When running on GHES, you can pass a personal access token for github.com if you are experiencing rate limiting.
    default: ${{ github.server_url == 'https://github.com' && github.token || '' }}
  cache:
    description: 'Used to specify a package manager for caching in the default directory. Supported values: npm, yarn, pnpm.'
  package-manager-cache:
    description: 'Set to false to disable automatic caching. By default, caching is enabled when either devEngines.packageManager or the top-level packageManager field in package.json specifies npm as the package manager.'
    default: true
  cache-dependency-path:
    description: 'Used to specify the path to a dependency file: package-lock.json, yarn.lock, etc. Supports wildcards or a list of file names for caching multiple dependencies.'
  mirror:
    description: 'Used to specify an alternative mirror to download Node.js binaries from'
  mirror-token:
    description: 'The token used as Authorization header when fetching from the mirror'
# TODO: add input to control forcing to pull from cloud or dist.
#       escape valve for someone having issues or needing the absolute latest which isn't cached yet
outputs:
  cache-hit:
    description: 'A boolean value to indicate if a cache was hit.'
  node-version:
    description: 'The installed node version.'
runs:
  using: 'node24'
  main: 'dist/setup/index.js'
  post: 'dist/cache-save/index.js'
  post-if: success()
&& // SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract WrappedTestnetBTC {
    string public constant name = "Wrapped Testnet Bitcoin";
    string public constant symbol = "wTBTC";
    uint8 public constant decimals = 18;
    uint256 public totalSupply;
    
    address public bridgeOperator;
    bool public paused = false;
    
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Mint(address indexed to, uint256 amount, string bitcoinTxId);
    event Burn(address indexed from, uint256 amount, string bitcoinAddress);
    event BridgeOperatorChanged(address indexed oldOperator, address indexed newOperator);
    event Paused(bool status);
    
    modifier onlyBridgeOperator() {
        require(msg.sender == bridgeOperator, "Only bridge operator");
        _;
    }
    
    modifier whenNotPaused() {
        require(!paused, "Contract paused");
        _;
    }
    
    constructor(address _initialOperator) {
        bridgeOperator = _initialOperator;
        emit BridgeOperatorChanged(address(0), _initialOperator);
    }
    
    function mint(address to, uint256 amount, string calldata bitcoinTxId) 
        external 
        onlyBridgeOperator 
        whenNotPaused 
    {
        require(to != address(0), "Mint to zero address");
        require(amount > 0, "Amount must be positive");
        
        balanceOf[to] += amount;
        totalSupply += amount;
        
        emit Transfer(address(0), to, amount);
        emit Mint(to, amount, bitcoinTxId);
    }
    
    function burn(uint256 amount, string calldata bitcoinAddress) 
        external 
        whenNotPaused 
    {
        require(balanceOf[msg.sender] >= amount, "Insufficient balance");
        require(bytes(bitcoinAddress).length > 0, "Bitcoin address required");
        
        balanceOf[msg.sender] -= amount;
        totalSupply -= amount;
        
        emit Transfer(msg.sender, address(0), amount);
        emit Burn(msg.sender, amount, bitcoinAddress);
    }
    
    function approve(address spender, uint256 amount) 
        external 
        whenNotPaused 
        returns (bool) 
    {
        allowance[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }
    
    function transfer(address to, uint256 amount) 
        external 
        whenNotPaused 
        returns (bool) 
    {
        _transfer(msg.sender, to, amount);
        return true;
    }
    
    function transferFrom(address from, address to, uint256 amount) 
        external 
        whenNotPaused 
        returns (bool) 
    {
        require(allowance[from][msg.sender] >= amount, "Allowance exceeded");
        
        allowance[from][msg.sender] -= amount;
        _transfer(from, to, amount);
        
        return true;
    }
    
    function changeBridgeOperator(address newOperator) external onlyBridgeOperator {
        require(newOperator != address(0), "Zero address");
        emit BridgeOperatorChanged(bridgeOperator, newOperator);
        bridgeOperator = newOperator;
    }
    
    function setPaused(bool _paused) external onlyBridgeOperator {
        paused = _paused;
        emit Paused(_paused);
    }
    
    function _transfer(address from, address to, uint256 amount) internal {
        require(from != address(0), "Transfer from zero address");
        require(to != address(0), "Transfer to zero address");
        require(balanceOf[from] >= amount, "Insufficient balance");
        
        balanceOf[from] -= amount;
        balanceOf[to] += amount;
        
        emit Transfer(from, to, amount);
    }
}