class Dynare < Formula
  homepage "http://www.dynare.org"
  revision 1

  option "with-matlab=", "Path to Matlab root directory (to build mex files)"
  option "with-matlab-version=", "Matlab version, e.g., 8.2 (to build mex files)"
  option "with-doc", "Build documentation"
  option "without-check", "Disable build-time checks (not recommended)"

  stable do
    url "https://www.dynare.org/release/source/dynare-4.4.3.tar.xz"
    sha256 "d00f97f72bcad7486ec1d18640d44b607d91ff9f585c9b4e01d08b6a3deeae21"
    depends_on "matlab2tikz"
  end

  head do
    url "https://github.com/DynareTeam/dynare.git"
    depends_on "automake" => :build
    depends_on "bison"    => :build
    depends_on "gettext"  => :build

    resource "flex" do
      url "https://downloads.sourceforge.net/flex/flex-2.5.39.tar.bz2"
      sha256 "add2b55f3bc38cb512b48fad7d72f43b11ef244487ff25fc00aabec1e32b617f"
    end
  end

  depends_on :tex    => :build
  depends_on "boost" => :build
  depends_on "xz"    => :build
  depends_on "fftw"
  depends_on "gsl"
  depends_on "libmatio"
  depends_on :fortran

  depends_on "doxygen" => :build if build.with? "doc"

  depends_on "slicot" => ["with-default-integer-8"] if build.with? "matlab="
  depends_on "octave" => :recommended

  def install
    args = %W[
      --disable-debug
      --disable-dependency-tracking
      --disable-silent-rules
      --prefix=#{prefix}
    ]
    if build.head?
      flexpath="#{buildpath}/flex"
      resource("flex").stage do
        system "./configure", "--disable-dependency-tracking",
               "--disable-shared",
               "--prefix=#{flexpath}"
        system "make", "install"
      end
      ENV.prepend_path "PATH", "#{flexpath}/bin"
    end
    matlab_path = ARGV.value("with-matlab") || ""
    matlab_version = ARGV.value("with-matlab-version") || ""
    if (matlab_path.empty? || matlab_version.empty?) && build.without?("octave")
      raise "You must build Dynare with Matlab and/or Octave support"
    end

    if matlab_path.empty? || matlab_version.empty?
      unless matlab_path.empty? && matlab_version.empty?
        opoo "Matlab support disabled: specify both Matlab path and version"
      end
      args << "--disable-matlab"
    else
      args << "--with-matlab=#{matlab_path}"
      args << "MATLAB_VERSION=#{matlab_version}"
    end

    args << "--disable-octave" if build.without? "octave"

    system "autoreconf", "-si" if build.head?
    system "./configure", *args

    if build.with?("doc") && OS.mac?
      inreplace "doc/Makefile", \
                "$(TEXI2PDF) $(AM_V_texinfo) --build-dir=$(@:.pdf=.t2p) -o $@ $(AM_V_texidevnull)", \
                "$(TEXI2PDF) $(AM_V_texinfo) --build-dir=$(@:.pdf=.t2p) $(AM_V_texidevnull)"
    end

    system "make", "pdf" if build.with? "doc"
    system "make", "install"

    # Install documentation by hand
    if build.with? "doc"
      doc.install Dir["doc/*.pdf"]
      doc.install "doc/macroprocessor/macroprocessor.pdf", \
      "doc/parallel/parallel.pdf", "doc/preprocessor/preprocessor.pdf", \
      "doc/userguide/UserGuide.pdf", "doc/gsa/gsa.pdf"
    end

    # Record Matlab info.
    if build.with? "matlab="
      File.open(prefix / "matlab.config", "w") do |f|
        f.puts(matlab_path)
        f.puts(matlab_version)
      end
    end
  end

  test do
    copy("#{lib}/dynare/examples/bkk.mod", testpath)
    if build.with? "octave"
      system "octave --no-gui -H " \
        "--path #{opt_prefix}/lib/dynare/matlab " \
        "--eval 'dynare bkk.mod console'"
    end

    if build.with? "matlab="
      matlab_path = File.open(prefix / "matlab.config") { |f| f.gets.chomp }
      system "#{matlab_path}/bin/matlab -nosplash -nodisplay " \
        "-r 'addpath #{opt_prefix}/lib/dynare/matlab; dynare bkk.mod console; exit'"
    end
  end

  def caveats; <<-EOS.undent
    To get started with dynare, open Matlab or Octave and type:

            addpath #{opt_prefix}/lib/dynare/matlab
    EOS
  end
end