class Lmod < Formula
  desc "Lua-based environment modules system to modify PATH variable"
  homepage "https://lmod.readthedocs.io"
  url "https://github.com/TACC/Lmod/archive/refs/tags/9.1.0.tar.gz"
  sha256 "197ab8be3d82698d11b43d954eab467d9baa40de619a38d2bf82cc288097e422"
  license "MIT"

  bottle do
    sha256 cellar: :any,                 arm64_tahoe:   "8b6ac4ff4276cef094697b25728aaad4a289798e5b4abe473b7fabd3fb725c8c"
    sha256 cellar: :any,                 arm64_sequoia: "8741875ccf1bf0923f24cf32abf3b709c640c545d84ce38ce080725a0aea7b4a"
    sha256 cellar: :any,                 arm64_sonoma:  "3eeff66d409ad2d72176140d517a1a7a62f4e04a4dc06492585f1dd7c6cf9270"
    sha256 cellar: :any,                 sonoma:        "4be9d44b4a74be6aefa63d91a0e703ee3f60448e5c478c7ad052f2ca0d92abbd"
    sha256 cellar: :any_skip_relocation, arm64_linux:   "568721eaec14d494809af239a0afd298d8241300b03daa60cc6b4b7e876e550c"
    sha256 cellar: :any_skip_relocation, x86_64_linux:  "e02fa303d544370e19e4d802afb8a4143bec092905998b78ea2ec42c8e0ca789"
  end

  depends_on "luarocks" => :build
  depends_on "pkgconf" => :build
  depends_on "lua"
  depends_on "tcl-tk"

  uses_from_macos "bc-gh" => :build
  uses_from_macos "libxcrypt"

  on_macos do
    depends_on "gnu-sed" => :build
  end

  resource "lua-term" do
    url "https://github.com/hoelzro/lua-term/archive/refs/tags/0.8.tar.gz"
    sha256 "0cb270be22dfc262beec2f4ffc66b878ccaf236f537d693fa36c8f578fc51aa6"
  end

  resource "luafilesystem" do
    url "https://github.com/lunarmodules/luafilesystem/archive/refs/tags/v1_9_0.tar.gz"
    sha256 "1142c1876e999b3e28d1c236bf21ffd9b023018e336ac25120fb5373aade1450"
  end

  resource "luaposix" do
    url "https://github.com/luaposix/luaposix/archive/refs/tags/v36.3.tar.gz"
    sha256 "82cd9a96c41a4a3205c050206f0564ff4456f773a8f9ffc9235ff8f1907ca5e6"
  end

  def install
    luaversion = Formula["lua"].version.major_minor
    luapath = libexec/"vendor"
    ENV["LUA_PATH"] = "?.lua;" \
                      "#{luapath}/share/lua/#{luaversion}/?.lua;" \
                      "#{luapath}/share/lua/#{luaversion}/?/init.lua;;"
    ENV["LUA_CPATH"] = "#{luapath}/lib/lua/#{luaversion}/?.so;;"

    resources.each do |r|
      r.stage do
        system "luarocks", "make", "--tree=#{luapath}"
      end
    end

    # configure overrides PKG_CONFIG_PATH with TCL_PKG_CONFIG_DIR value
    ENV["TCL_PKG_CONFIG_DIR"] = ENV["PKG_CONFIG_PATH"]

    system "./configure", "--with-siteControlPrefix=yes", "--prefix=#{prefix}"
    ENV.deparallelize # Work around "install: mkdir .../share/man: File exists"
    system "make", "install"

    # Remove man page which conflicts with `modules` formula
    rm man1/"module.1"
  end

  def caveats
    <<~EOS
      To use Lmod, you should add the init script to the shell you are using.

      For example, the bash setup script is here: #{opt_prefix}/init/profile
      and you can source it in your bash setup or link to it.

      If you use fish, use #{opt_prefix}/init/fish, such as:
        ln -s #{opt_prefix}/init/fish ~/.config/fish/conf.d/00_lmod.fish
    EOS
  end

  test do
    sh_init = "#{prefix}/init/sh"

    (testpath/"lmodtest.sh").write <<~SHELL
      #!/bin/sh
      . #{sh_init}
      module list
    SHELL

    assert_match "No modules loaded", shell_output("sh #{testpath}/lmodtest.sh 2>&1")

    system sh_init
    output = shell_output("#{prefix}/libexec/spider #{prefix}/modulefiles/Core/")
    assert_match "lmod", output
    assert_match "settarg", output
  end
end