class Grafana < Formula
  desc "Gorgeous metric visualizations and dashboards for timeseries databases"
  homepage "https://grafana.com"
  url "https://github.com/grafana/grafana/archive/v8.3.6.tar.gz"
  sha256 "2d5bd2193898d3bd863141578616f9f4e60f89e47164c620d96758f72c3b4224"
  license "AGPL-3.0-only"
  head "https://github.com/grafana/grafana.git", branch: "main"

  bottle do
    sha256 cellar: :any_skip_relocation, arm64_monterey: "790c6d3c556e2e542da02eed17378f59047d74041c8fef9719ef593e43d95a96"
    sha256 cellar: :any_skip_relocation, arm64_big_sur:  "246d6fb97661f926b23662661149a0ec28f5015b326c14194314aaa599920072"
    sha256 cellar: :any_skip_relocation, monterey:       "652bf8d51d479e5dfdd52240f0e44593f0acbb964b2bba669e9d7f18182bd66b"
    sha256 cellar: :any_skip_relocation, big_sur:        "80500fd6b5bee6e3a6929e00b93b8afa49bfa6de80114166a36708d60c9e5892"
    sha256 cellar: :any_skip_relocation, catalina:       "18d08300260324885b4084a17a5b640acd4d513f5a05f91cd82bf3c90bcc93b9"
    sha256 cellar: :any_skip_relocation, x86_64_linux:   "e8eeafab5fdd7f66ddc5ffd6eb949c553a23ee6a7676eba9702342d0e7bf2470"
  end

  depends_on "go" => :build
  depends_on "node" => :build
  depends_on "yarn" => :build

  uses_from_macos "zlib"

  on_linux do
    depends_on "fontconfig"
    depends_on "freetype"
  end

  def install
    ENV["NODE_OPTIONS"] = "--max-old-space-size=4096"
    system "make", "gen-go"
    system "go", "run", "build.go", "build"

    system "yarn", "install"

    system "yarn", "build"

    if OS.mac?
      bin.install Dir["bin/darwin-*/grafana-cli"]
      bin.install Dir["bin/darwin-*/grafana-server"]
    else
      bin.install "bin/linux-amd64/grafana-cli"
      bin.install "bin/linux-amd64/grafana-server"
    end
    (etc/"grafana").mkpath
    cp("conf/sample.ini", "conf/grafana.ini.example")
    etc.install "conf/sample.ini" => "grafana/grafana.ini"
    etc.install "conf/grafana.ini.example" => "grafana/grafana.ini.example"
    pkgshare.install "conf", "public", "tools"
  end

  def post_install
    (var/"log/grafana").mkpath
    (var/"lib/grafana/plugins").mkpath
  end

  service do
    run [opt_bin/"grafana-server",
         "--config", etc/"grafana/grafana.ini",
         "--homepath", opt_pkgshare,
         "--packaging=brew",
         "cfg:default.paths.logs=#{var}/log/grafana",
         "cfg:default.paths.data=#{var}/lib/grafana",
         "cfg:default.paths.plugins=#{var}/lib/grafana/plugins"]
    keep_alive true
    error_log_path var/"log/grafana-stderr.log"
    log_path var/"log/grafana-stdout.log"
    working_dir var/"lib/grafana"
  end

  test do
    require "pty"
    require "timeout"

    # first test
    system bin/"grafana-server", "-v"

    # avoid stepping on anything that may be present in this directory
    tdir = File.join(Dir.pwd, "grafana-test")
    Dir.mkdir(tdir)
    logdir = File.join(tdir, "log")
    datadir = File.join(tdir, "data")
    plugdir = File.join(tdir, "plugins")
    [logdir, datadir, plugdir].each do |d|
      Dir.mkdir(d)
    end
    Dir.chdir(pkgshare)

    res = PTY.spawn(bin/"grafana-server",
      "cfg:default.paths.logs=#{logdir}",
      "cfg:default.paths.data=#{datadir}",
      "cfg:default.paths.plugins=#{plugdir}",
      "cfg:default.server.http_port=50100")
    r = res[0]
    w = res[1]
    pid = res[2]

    listening = Timeout.timeout(10) do
      li = false
      r.each do |l|
        if /HTTP Server Listen/.match?(l)
          li = true
          break
        end
      end
      li
    end

    Process.kill("TERM", pid)
    w.close
    r.close
    listening
  end
end