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// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity ^0.8.25;

/// @title DelegationWall - Release 1, Build 1
/// @author Aragon Association - 2024
/// @notice A smart contract where any wallet can announce itself as a delegate by providing an IPFS Id
contract DelegationWall {
  struct Candidate {
    bytes contentUrl;
  }

  /// @dev Stores the data registered by the delegate candidates
  mapping(address => Candidate) public candidates;

  /// @dev Keeps track of the addresses that have been already registered, used to enumerate.
  address[] public candidateAddresses;

  /// @notice Emitted when a wallet registers as a candidate
  event CandidateRegistered(address indexed candidate, bytes contentUrl);

  /// @notice Raised when a delegate registers with an empty contentUrl
  error EmptyContent();

  /// @notice Registers the given data as a new delegation candidate
  function register(bytes memory _contentUrl) public {
    if (_contentUrl.length == 0) revert EmptyContent();

    if (candidates[msg.sender].contentUrl.length == 0) {
      candidateAddresses.push(msg.sender);
    }

    candidates[msg.sender].contentUrl = _contentUrl;

    emit CandidateRegistered(msg.sender, _contentUrl);
  }

  /// @notice Returns the list of candidate addresses registered
  /// @dev Use this function to get all addresses in a single call. You can still call candidateAddresses[idx] to resolve them one by one.
  function getCandidateAddresses() public view returns (address[] memory) {
    return candidateAddresses;
  }

  /// @notice Returns the number of candidate entries available
  function candidateCount() public view returns (uint256) {
    return candidateAddresses.length;
  }
}

{
  "remappings": [
    "@openzeppelin/contracts/=node_modules/@openzeppelin/contracts/",
    "forge-std/=node_modules/forge-std/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "none",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "shanghai",
  "viaIR": false,
  "libraries": {}
}

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[{"inputs":[],"name":"EmptyContent","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"candidate","type":"address"},{"indexed":false,"internalType":"bytes","name":"contentUrl","type":"bytes"}],"name":"CandidateRegistered","type":"event"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"candidateAddresses","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"candidateCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"candidates","outputs":[{"internalType":"bytes","name":"contentUrl","type":"bytes"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getCandidateAddresses","outputs":[{"internalType":"address[]","name":"","type":"address[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"_contentUrl","type":"bytes"}],"name":"register","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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