class GoAT14 < Formula
  desc "Go programming environment (1.4)"
  homepage "https://golang.org"
  url "https://github.com/golang/go.git",
      :revision => "d76c7d5a31ffaba3134f16981abd5f891fa2d805"
  version "1.4.3-20170922"

  bottle do
    sha256 "af2c899f899666f852bd9a99ba7b0e2159cdc366888b6068fa5fe5b0c5d4b2ea" => :high_sierra
    sha256 "eae6cbf2799ae38c2a909d97ab904d1962df7e7f2a3a62d106ada55ca06754c0" => :sierra
    sha256 "4322879a2d4024591b1c1cd33886184fa1838d33a6c64e5f14105cfef75a631f" => :el_capitan
  end

  keg_only :versioned_formula

  option "with-cc-all", "Build with cross-compilers and runtime support for all supported platforms"
  option "with-cc-common", "Build with cross-compilers and runtime support for darwin, linux and windows"

  resource "gotools" do
    url "https://go.googlesource.com/tools.git",
        :branch => "release-branch.go1.4"
  end

  def install
    ENV.refurbish_args

    # host platform (darwin) must come last in the targets list
    if build.with? "cc-all"
      targets = [
        ["linux",   ["386", "amd64", "arm"]],
        ["freebsd", ["386", "amd64", "arm"]],
        ["netbsd",  ["386", "amd64", "arm"]],
        ["openbsd", ["386", "amd64"]],
        ["windows", ["386", "amd64"]],
        ["dragonfly", ["386", "amd64"]],
        ["plan9",   ["386", "amd64"]],
        ["solaris", ["amd64"]],
        ["darwin",  ["386", "amd64"]],
      ]
    elsif build.with? "cc-common"
      targets = [
        ["linux",   ["386", "amd64", "arm"]],
        ["windows", ["386", "amd64"]],
        ["darwin",  ["386", "amd64"]],
      ]
    else
      targets = [["darwin", [""]]]
    end

    cd "src" do
      targets.each do |os, archs|
        archs.each do |arch|
          ENV["GOROOT_FINAL"] = libexec
          ENV["GOOS"]         = os
          ENV["GOARCH"]       = arch
          ENV["CGO_ENABLED"]  = "0"
          ohai "Building go for #{arch}-#{os}"
          system "./make.bash", "--no-clean"
        end
      end
    end

    (buildpath/"pkg/obj").rmtree
    libexec.install Dir["*"]
    (bin/"go").write_env_script(libexec/"bin/go", :PATH => "#{libexec}/bin:$PATH")
    bin.install_symlink libexec/"bin/gofmt"

    ENV.prepend_path "PATH", libexec/"bin"
    ENV["GOPATH"] = buildpath
    (buildpath/"src/golang.org/x/tools").install resource("gotools")

    cd "src/golang.org/x/tools/cmd/godoc/" do
      system "go", "build"
      (libexec/"bin").install "godoc"
    end
    bin.install_symlink libexec/"bin/godoc"

    cd "src/golang.org/x/tools/cmd/vet/" do
      system "go", "build"
      # This is where Go puts vet natively; not in the bin.
      (libexec/"pkg/tool/darwin_amd64/").install "vet"
    end
  end

  def caveats; <<~EOS
    As of go 1.2, a valid GOPATH is required to use the `go get` command:
      https://golang.org/doc/code.html#GOPATH

    You may wish to add the GOROOT-based install location to your PATH:
      export PATH=$PATH:#{opt_libexec}/bin
    EOS
  end

  test do
    (testpath/"hello.go").write <<~EOS
      package main
      import "fmt"
      func main() {
          fmt.Println("Hello World")
      }
    EOS
    # Run go fmt check for no errors then run the program.
    # This is a a bare minimum of go working as it uses fmt, build, and run.
    system "#{bin}/go", "fmt", "hello.go"
    assert_equal "Hello World\n", shell_output("#{bin}/go run hello.go")

    assert_predicate libexec/"bin/godoc", :exist?, "godoc does not exist!"
    assert_predicate libexec/"bin/godoc", :executable?, "godoc is not executable!"
    assert_predicate libexec/"pkg/tool/darwin_amd64/vet", :exist?, "vet does not exist!"
    assert_predicate libexec/"pkg/tool/darwin_amd64/vet", :executable?, "vet is not executable!"
  end
end