require "language/go"

class Coredns < Formula
  desc "DNS server that chains plugins"
  homepage "https://coredns.io"
  url "https://github.com/coredns/coredns/archive/v0.9.9.tar.gz"
  sha256 "9ca565bfbd708bd9bc66db20ec2feb3cd2a3354cf8590ba99bf2871fb847413b"
  head "https://github.com/coredns/coredns.git"

  def default_coredns_config; <<~EOS
    . {
      hosts {
        fallthrough
      }
      proxy . 8.8.8.8:53 8.8.4.4:53 {
        protocol https_google
      }
      cache
      errors
    }
    EOS
  end

  depends_on "go" => :build

  go_resource "github.com/mholt/caddy" do
    url "https://github.com/mholt/caddy.git",
      :revision => "fc75527eb5ea9d0252bb3079a0137dbbfb754790"
  end

  go_resource "github.com/miekg/dns" do
    url "https://github.com/miekg/dns.git",
      :revision => "822ae18e7187e1bbde923a37081f6c1b8e9ba68a"
  end

  go_resource "golang.org/x/text" do
    url "https://go.googlesource.com/text.git",
      :revision => "c01e4764d870b77f8abe5096ee19ad20d80e8075"
  end

  go_resource "golang.org/x/net" do
    url "https://go.googlesource.com/net.git",
      :revision => "5561cd9b4330353950f399814f427425c0a26fd2"
  end

  def install
    ENV["GOPATH"] = buildpath
    ENV["GOOS"] = "darwin"
    ENV["GOARCH"] = MacOS.prefer_64_bit? ? "amd64" : "386"

    (buildpath/"src/github.com/coredns/coredns").install buildpath.children
    Language::Go.stage_deps resources, buildpath/"src"

    cd "src/github.com/coredns/coredns" do
      system "go", "build", "-ldflags",
        "-X github.com/coredns/coredns/coremain.gitTag=#{version}",
        "-o", sbin/"coredns"
    end

    (buildpath/"Corefile.example").write default_coredns_config
    (etc/"coredns").mkpath
    etc.install "Corefile.example" => "coredns/Corefile"
  end

  def caveats; <<~EOS
    To configure coredns, take the default configuration at
    #{etc}/coredns/Corefile and edit to taste.

    By default it is configured to proxy all dns requests
    through Google's DNS-over-HTTPS:
    (https://developers.google.com/speed/public-dns/docs/dns-over-https).
    EOS
  end

  plist_options :startup => true

  def plist; <<~EOS
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
    <plist version="1.0">
    <dict>
    <key>Label</key>
    <string>#{plist_name}</string>
    <key>ProgramArguments</key>
    <array>
    <string>#{opt_sbin}/coredns</string>
    <string>-conf</string>
    <string>#{etc}/coredns/Corefile</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>KeepAlive</key>
    <true/>
    <key>StandardErrorPath</key>
    <string>#{var}/log/coredns.log</string>
    <key>StandardOutPath</key>
    <string>#{var}/log/coredns.log</string>
    <key>WorkingDirectory</key>
    <string>#{HOMEBREW_PREFIX}</string>
    </dict>
    </plist>
    EOS
  end

  test do
    assert_match "CoreDNS-#{version}", shell_output("#{sbin}/coredns -version")
  end
end