class Chapel < Formula
  desc "Programming language for productive parallel computing at scale"
  homepage "https://chapel-lang.org/"
  url "https://github.com/chapel-lang/chapel/releases/download/1.27.0/chapel-1.27.0.tar.gz"
  sha256 "558b1376fb7757a5e1f254c717953f598a3e89850c8edd1936b8d09c464f3e8b"
  license "Apache-2.0"

  bottle do
    sha256 arm64_monterey: "47e7d368c685aed62e699dbb9e87a881ab7d6a65873425b10d83d58458b62557"
    sha256 arm64_big_sur:  "632ea42631efaed6c650d311b8dbfa4b643869f55699192b4bb600b77d37079d"
    sha256 monterey:       "2863cfb4bc1082fba46a7c24a01db3a63abb2d6902ac1d5876fba13289b63eb4"
    sha256 big_sur:        "67f5179a97496c53649f6a851256246d419262aee7d0fdbdf734a380de1023b2"
    sha256 catalina:       "85a12fe66532bb5bcb31714054b7c081613886198fa4cc7bb8736053beb20c37"
    sha256 x86_64_linux:   "953787b24c4237de21e019d663bb779374968c878ffc08e72291c2f72afb8c6b"
  end

  depends_on "gmp"
  # `chapel` scripts use python on PATH (e.g. checking `command -v python3`),
  # so it needs to depend on the currently linked Homebrew Python version.
  # TODO: remove from versioned_dependencies_conflicts_allowlist when
  # when Python dependency matches LLVM's Python for all OS versions.
  depends_on "python@3.9"

  on_macos do
    depends_on "llvm" if MacOS.version > :catalina
    # fatal error: cannot open file './sys_basic.h': No such file or directory
    # Issue ref: https://github.com/Homebrew/homebrew-core/issues/96915
    depends_on "llvm@11" if MacOS.version <= :catalina
  end

  on_linux do
    depends_on "llvm"
  end

  # LLVM is built with gcc11 and we will fail on linux with gcc version 5.xx
  fails_with gcc: "5"

  # Work around Homebrew 11-arm64 CI issue, which outputs unwanted objc warnings like:
  # objc[42134]: Class ... is implemented in both ... One of the two will be used. Which one is undefined.
  # These end up incorrectly failing checkChplInstall test script when it checks for stdout/stderr.
  # TODO: remove when Homebrew CI no longer outputs these warnings or 11-arm64 is no longer used.
  patch :DATA

  def llvm
    deps.map(&:to_formula).find { |f| f.name.match? "^llvm" }
  end

  def install
    libexec.install Dir["*"]
    # Chapel uses this ENV to work out where to install.
    ENV["CHPL_HOME"] = libexec
    ENV["CHPL_GMP"] = "system"
    # This enables a workaround for
    #   https://github.com/llvm/llvm-project/issues/54438
    ENV["CHPL_HOST_USE_SYSTEM_LIBCXX"] = "yes"

    # Must be built from within CHPL_HOME to prevent build bugs.
    # https://github.com/Homebrew/legacy-homebrew/pull/35166
    cd libexec do
      # don't try to set CHPL_LLVM_GCC_PREFIX since the llvm@13
      # package should be configured to use a reasonable GCC
      (libexec/"chplconfig").write <<~EOS
        CHPL_RE2=bundled
        CHPL_GMP=system
        CHPL_LLVM_CONFIG=#{llvm.opt_bin}/llvm-config
        CHPL_LLVM_GCC_PREFIX=none
      EOS

      system "./util/printchplenv", "--all"
      with_env(CHPL_PIP_FROM_SOURCE: "1") do
        system "make", "test-venv"
      end
      with_env(CHPL_LLVM: "none") do
        system "make"
      end
      with_env(CHPL_LLVM: "system") do
        system "make"
      end
      with_env(CHPL_PIP_FROM_SOURCE: "1") do
        system "make", "chpldoc"
      end
      system "make", "mason"
      system "make", "cleanall"

      rm_rf("third-party/llvm/llvm-src/")
      rm_rf("third-party/gasnet/gasnet-src")
      rm_rf("third-party/libfabric/libfabric-src")
      rm_rf("third-party/fltk/fltk-1.3.5-source.tar.gz")
      rm_rf("third-party/libunwind/libunwind-1.1.tar.gz")
      rm_rf("third-party/gmp/gmp-src/")
      rm_rf("third-party/qthread/qthread-src/installed")
    end

    # Install chpl and other binaries (e.g. chpldoc) into bin/ as exec scripts.
    platform = if OS.linux? && Hardware::CPU.is_64_bit?
      "linux64-#{Hardware::CPU.arch}"
    else
      "#{OS.kernel_name.downcase}-#{Hardware::CPU.arch}"
    end

    bin.install libexec.glob("bin/#{platform}/*")
    bin.env_script_all_files libexec/"bin"/platform, CHPL_HOME: libexec
    man1.install_symlink libexec.glob("man/man1/*.1")
  end

  test do
    ENV["CHPL_HOME"] = libexec
    ENV["CHPL_INCLUDE_PATH"] = HOMEBREW_PREFIX/"include"
    ENV["CHPL_LIB_PATH"] = HOMEBREW_PREFIX/"lib"
    cd libexec do
      with_env(CHPL_LLVM: "system") do
        system "util/test/checkChplInstall"
      end
      with_env(CHPL_LLVM: "none") do
        system "util/test/checkChplInstall"
      end
    end
    system bin/"chpl", "--print-passes", "--print-commands", libexec/"examples/hello.chpl"
  end
end

__END__
diff --git a/util/test/checkChplInstall b/util/test/checkChplInstall
index 7d2eb78a88..a9ddf22054 100755
--- a/util/test/checkChplInstall
+++ b/util/test/checkChplInstall
@@ -189,6 +189,7 @@ fi
 if [ -n "${TEST_COMP_OUT}" ]; then
     # apply "prediff"-like filter to remove gmake "clock skew detected" warnings, if any
     TEST_COMP_OUT=$( grep <<<"${TEST_COMP_OUT}" -v \
+        -e '^objc\(\[[0-9]*\]\)*: Class .* is implemented in both .* One of the two will be used\. Which one is undefined\. *$' \
         -e '^g*make\(\[[0-9]*\]\)*: Warning: File .* has modification time .* in the future *$' \
         -e '^g*make\(\[[0-9]*\]\)*: warning:  Clock skew detected\.  Your build may be incomplete\. *$' )
 fi