class Ethereum < Formula
  desc "Official Go implementation of the Ethereum protocol"
  homepage "https://ethereum.github.io/go-ethereum/"
  url "https://github.com/ethereum/go-ethereum/archive/v1.8.20.tar.gz"
  sha256 "7299f72a1d35a2653075a2070babf78f98f6eb3f41da43293304737ac0156658"
  head "https://github.com/ethereum/go-ethereum.git"

  bottle do
    cellar :any_skip_relocation
    sha256 "f95ccb1e538c6d38b15c136013fc5cab9762abbeae972fe5bde4126be158e9a5" => :mojave
    sha256 "f7a020560d3246e427887a0da0baddc1bb5e5c30a00939856e4764f63bdf6fde" => :high_sierra
    sha256 "46f13fe2240dc5eeaf27db26307e0cea52095e6ce9887289aa2b72e7e1fb3f79" => :sierra
  end

  depends_on "go" => :build

  def install
    system "make", "all"
    bin.install Dir["build/bin/*"]
  end

  test do
    (testpath/"genesis.json").write <<~EOS
      {
        "config": {
          "homesteadBlock": 10
        },
        "nonce": "0",
        "difficulty": "0x20000",
        "mixhash": "0x00000000000000000000000000000000000000647572616c65787365646c6578",
        "coinbase": "0x0000000000000000000000000000000000000000",
        "timestamp": "0x00",
        "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "extraData": "0x",
        "gasLimit": "0x2FEFD8",
        "alloc": {}
      }
    EOS
    system "#{bin}/geth", "--datadir", "testchain", "init", "genesis.json"
    assert_predicate testpath/"testchain/geth/chaindata/000001.log", :exist?,
                     "Failed to create log file"
  end
end