class Traefik < Formula
  desc "Modern reverse proxy"
  homepage "https://traefik.io/"
  url "https://github.com/traefik/traefik/releases/download/v2.4.6/traefik-v2.4.6.src.tar.gz"
  sha256 "6ef50405cc81ee30813ff0af7dd490b70fbbc300962dc04fcee5a03554f02b1b"
  license "MIT"
  head "https://github.com/traefik/traefik.git"

  bottle do
    sha256 cellar: :any_skip_relocation, arm64_big_sur: "ac377bc42b83d228db2f688352e99179f63b193c9c99e9579b3d46153605c55e"
    sha256 cellar: :any_skip_relocation, big_sur:       "dd78a91d8e4753f492a19bb2ffdec5b5a4549a9f1ced4d0c1e5ab1e891c71c3b"
    sha256 cellar: :any_skip_relocation, catalina:      "ecd26b01877efc9abec1adb3d8f25b90c5b6a03639744685118245682a921a5c"
    sha256 cellar: :any_skip_relocation, mojave:        "a9a910fca41aed2f8650db2811e7e8ce8b0e7731dfd3d8ff5412cc566479a980"
  end

  depends_on "go" => :build
  depends_on "go-bindata" => :build

  def install
    system "go", "generate"
    system "go", "build",
      "-ldflags", "-s -w -X github.com/traefik/traefik/v#{version.major}/pkg/version.Version=#{version}",
      "-trimpath", "-o", bin/"traefik", "./cmd/traefik"
  end

  plist_options manual: "traefik"

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

  test do
    ui_port = free_port
    http_port = free_port

    (testpath/"traefik.toml").write <<~EOS
      [entryPoints]
        [entryPoints.http]
          address = ":#{http_port}"
        [entryPoints.traefik]
          address = ":#{ui_port}"
      [api]
        insecure = true
        dashboard = true
    EOS

    begin
      pid = fork do
        exec bin/"traefik", "--configfile=#{testpath}/traefik.toml"
      end
      sleep 5
      cmd_ui = "curl -sIm3 -XGET http://127.0.0.1:#{http_port}/"
      assert_match "404 Not Found", shell_output(cmd_ui)
      sleep 1
      cmd_ui = "curl -sIm3 -XGET http://127.0.0.1:#{ui_port}/dashboard/"
      assert_match "200 OK", shell_output(cmd_ui)
    ensure
      Process.kill(9, pid)
      Process.wait(pid)
    end

    assert_match version.to_s, shell_output("#{bin}/traefik version 2>&1")
  end
end