require "dev-cmd/audit"
require "formulary"

module Count
  def self.increment
    @count ||= 0
    @count += 1
  end
end

module Homebrew
  describe FormulaText do
    alias_matcher :have_data, :be_data
    alias_matcher :have_end, :be_end
    alias_matcher :have_trailing_newline, :be_trailing_newline

    let(:dir) { mktmpdir }

    def formula_text(name, body = nil, options = {})
      path = dir/"#{name}.rb"

      path.write <<~RUBY
        class #{Formulary.class_s(name)} < Formula
          #{body}
        end
        #{options[:patch]}
      RUBY

      described_class.new(path)
    end

    specify "simple valid Formula" do
      ft = formula_text "valid", <<~RUBY
        url "https://www.example.com/valid-1.0.tar.gz"
      RUBY

      expect(ft).not_to have_data
      expect(ft).not_to have_end
      expect(ft).to have_trailing_newline

      expect(ft =~ /\burl\b/).to be_truthy
      expect(ft.line_number(/desc/)).to be nil
      expect(ft.line_number(/\burl\b/)).to eq(2)
      expect(ft).to include("Valid")
    end

    specify "#trailing_newline?" do
      ft = formula_text "newline"
      expect(ft).to have_trailing_newline
    end

    specify "#data?" do
      ft = formula_text "data", <<~RUBY
        patch :DATA
      RUBY

      expect(ft).to have_data
    end

    specify "#end?" do
      ft = formula_text "end", "", patch: "__END__\na patch here"
      expect(ft).to have_end
      expect(ft.without_patch).to eq("class End < Formula\n  \nend")
    end
  end

  describe FormulaAuditor do
    def formula_auditor(name, text, options = {})
      path = Pathname.new "#{dir}/#{name}.rb"
      path.open("w") do |f|
        f.write text
      end

      described_class.new(Formulary.factory(path), options)
    end

    let(:dir) { mktmpdir }

    describe "#problems" do
      it "is empty by default" do
        fa = formula_auditor "foo", <<~RUBY
          class Foo < Formula
            url "https://example.com/foo-1.0.tgz"
          end
        RUBY

        expect(fa.problems).to be_empty
      end
    end

    describe "#audit_file" do
      specify "file permissions" do
        allow(File).to receive(:umask).and_return(022)

        fa = formula_auditor "foo", <<~RUBY
          class Foo < Formula
            url "https://example.com/foo-1.0.tgz"
          end
        RUBY

        path = fa.formula.path
        path.chmod 0400

        fa.audit_file
        expect(fa.problems)
          .to eq(["Incorrect file permissions (400): chmod 644 #{path}"])
      end

      specify "DATA but no __END__" do
        fa = formula_auditor "foo", <<~RUBY
          class Foo < Formula
            url "https://example.com/foo-1.0.tgz"
            patch :DATA
          end
        RUBY

        fa.audit_file
        expect(fa.problems).to eq(["'DATA' was found, but no '__END__'"])
      end

      specify "__END__ but no DATA" do
        fa = formula_auditor "foo", <<~RUBY
          class Foo < Formula
            url "https://example.com/foo-1.0.tgz"
          end
          __END__
          a patch goes here
        RUBY

        fa.audit_file
        expect(fa.problems).to eq(["'__END__' was found, but 'DATA' is not used"])
      end

      specify "no trailing newline" do
        fa = formula_auditor "foo", 'class Foo<Formula; url "file:///foo-1.0.tgz";end'

        fa.audit_file
        expect(fa.problems).to eq(["File should end with a newline"])
      end

      specify "no issue" do
        fa = formula_auditor "foo", <<~RUBY
          class Foo < Formula
            url "https://example.com/foo-1.0.tgz"
            homepage "https://example.com"
          end
        RUBY

        fa.audit_file
        expect(fa.problems).to eq([])
      end
    end

    describe "#line_problems" do
      specify "pkgshare" do
        fa = formula_auditor "foo", <<~RUBY, strict: true
          class Foo < Formula
            url "https://example.com/foo-1.0.tgz"
          end
        RUBY

        fa.line_problems 'ohai "#{share}/foo"', 3
        expect(fa.problems.shift).to eq("Use \#{pkgshare} instead of \#{share}/foo")

        fa.line_problems 'ohai "#{share}/foo/bar"', 3
        expect(fa.problems.shift).to eq("Use \#{pkgshare} instead of \#{share}/foo")

        fa.line_problems 'ohai share/"foo"', 3
        expect(fa.problems.shift).to eq('Use pkgshare instead of (share/"foo")')

        fa.line_problems 'ohai share/"foo/bar"', 3
        expect(fa.problems.shift).to eq('Use pkgshare instead of (share/"foo")')

        fa.line_problems 'ohai "#{share}/foo-bar"', 3
        expect(fa.problems).to eq([])

        fa.line_problems 'ohai share/"foo-bar"', 3
        expect(fa.problems).to eq([])

        fa.line_problems 'ohai share/"bar"', 3
        expect(fa.problems).to eq([])
      end

      # Regression test for https://github.com/Homebrew/legacy-homebrew/pull/48744
      # Formulae with "++" in their name would break various audit regexps:
      #   Error: nested *?+ in regexp: /^libxml++3\s/
      specify "++ in name" do
        fa = formula_auditor "foolibc++", <<~RUBY, strict: true
          class Foolibcxx < Formula
            desc "foolibc++ is a test"
            url "https://example.com/foo-1.0.tgz"
          end
        RUBY

        fa.line_problems 'ohai "#{share}/foolibc++"', 3
        expect(fa.problems.shift)
          .to eq("Use \#{pkgshare} instead of \#{share}/foolibc++")

        fa.line_problems 'ohai share/"foolibc++"', 3
        expect(fa.problems.shift)
          .to eq('Use pkgshare instead of (share/"foolibc++")')
      end
    end

    describe "#audit_github_repository" do
      specify "#audit_github_repository when HOMEBREW_NO_GITHUB_API is set" do
        ENV["HOMEBREW_NO_GITHUB_API"] = "1"

        fa = formula_auditor "foo", <<~RUBY, strict: true, online: true
          class Foo < Formula
            homepage "https://github.com/example/example"
            url "https://example.com/foo-1.0.tgz"
          end
        RUBY

        fa.audit_github_repository
        expect(fa.problems).to eq([])
      end
    end

    describe "#audit_deps" do
      describe "a dependency on a macOS-provided keg-only formula" do
        describe "which is whitelisted" do
          subject { fa }

          let(:fa) do
            formula_auditor "foo", <<~RUBY, new_formula: true
              class Foo < Formula
                url "https://example.com/foo-1.0.tgz"
                homepage "https://example.com"

                depends_on "openssl"
              end
            RUBY
          end

          let(:f_openssl) do
            formula do
              url "https://example.com/openssl-1.0.tgz"
              homepage "https://example.com"

              keg_only :provided_by_macos
            end
          end

          before do
            allow(fa.formula.deps.first)
              .to receive(:to_formula).and_return(f_openssl)
            fa.audit_deps
          end

          its(:problems) { are_expected.to be_empty }
        end

        describe "which is not whitelisted" do
          subject { fa }

          let(:fa) do
            formula_auditor "foo", <<~RUBY, new_formula: true
              class Foo < Formula
                url "https://example.com/foo-1.0.tgz"
                homepage "https://example.com"

                depends_on "bc"
              end
            RUBY
          end

          let(:f_bc) do
            formula do
              url "https://example.com/bc-1.0.tgz"
              homepage "https://example.com"

              keg_only :provided_by_macos
            end
          end

          before do
            allow(fa.formula.deps.first)
              .to receive(:to_formula).and_return(f_bc)
            fa.audit_deps
          end

          its(:new_formula_problems) { are_expected.to match([/unnecessary/]) }
        end
      end
    end

    describe "#audit_keg_only_style" do
      specify "keg_only_needs_downcasing" do
        fa = formula_auditor "foo", <<~RUBY, strict: true
          class Foo < Formula
            url "https://example.com/foo-1.0.tgz"

            keg_only "Because why not"
          end
        RUBY

        fa.audit_keg_only_style
        expect(fa.problems)
          .to eq(["'Because' from the keg_only reason should be 'because'.\n"])
      end

      specify "keg_only_redundant_period" do
        fa = formula_auditor "foo", <<~RUBY, strict: true
          class Foo < Formula
            url "https://example.com/foo-1.0.tgz"

            keg_only "because this line ends in a period."
          end
        RUBY

        fa.audit_keg_only_style
        expect(fa.problems)
          .to eq(["keg_only reason should not end with a period."])
      end

      specify "keg_only_handles_block_correctly" do
        fa = formula_auditor "foo", <<~RUBY, strict: true
          class Foo < Formula
            url "https://example.com/foo-1.0.tgz"

            keg_only <<~EOF
              this line starts with a lowercase word.

              This line does not but that shouldn't be a
              problem
            EOF
          end
        RUBY

        fa.audit_keg_only_style
        expect(fa.problems)
          .to eq([])
      end

      specify "keg_only_handles_whitelist_correctly" do
        fa = formula_auditor "foo", <<~RUBY, strict: true
          class Foo < Formula
            url "https://example.com/foo-1.0.tgz"

            keg_only "Apple ships foo in the CLT package"
          end
        RUBY

        fa.audit_keg_only_style
        expect(fa.problems)
          .to eq([])
      end
    end

    describe "#audit_revision_and_version_scheme" do
      subject {
        fa = described_class.new(Formulary.factory(formula_path))
        fa.audit_revision_and_version_scheme
        fa.problems.first
      }

      let(:origin_tap_path) { Tap::TAP_DIRECTORY/"homebrew/homebrew-foo" }
      let(:foo_version) { Count.increment }
      let(:formula_subpath) { "Formula/foo#{foo_version}.rb" }
      let(:origin_formula_path) { origin_tap_path/formula_subpath }
      let(:tap_path) { Tap::TAP_DIRECTORY/"homebrew/homebrew-bar" }
      let(:formula_path) { tap_path/formula_subpath }

      before do
        origin_formula_path.write <<~RUBY
          class Foo#{foo_version} < Formula
            url "https://example.com/foo-1.0.tar.gz"
            revision 2
            version_scheme 1
          end
        RUBY

        origin_tap_path.mkpath
        origin_tap_path.cd do
          system "git", "init"
          system "git", "add", "--all"
          system "git", "commit", "-m", "init"
        end

        tap_path.mkpath
        tap_path.cd do
          system "git", "clone", origin_tap_path, "."
        end
      end

      def formula_gsub(before, after = "")
        text = formula_path.read
        text.gsub! before, after
        formula_path.unlink
        formula_path.write text
      end

      def formula_gsub_commit(before, after = "")
        text = origin_formula_path.read
        text.gsub!(before, after)
        origin_formula_path.unlink
        origin_formula_path.write text

        origin_tap_path.cd do
          system "git", "commit", "-am", "commit"
        end

        tap_path.cd do
          system "git", "fetch"
          system "git", "reset", "--hard", "origin/master"
        end
      end

      context "revisions" do
        context "should not be removed when first committed above 0" do
          it { is_expected.to be_nil }
        end

        context "should not decrease with the same version" do
          before { formula_gsub_commit "revision 2", "revision 1" }

          it { is_expected.to match("revision should not decrease (from 2 to 1)") }
        end

        context "should not be removed with the same version" do
          before { formula_gsub_commit "revision 2" }

          it { is_expected.to match("revision should not decrease (from 2 to 0)") }
        end

        context "should not decrease with the same, uncommitted version" do
          before { formula_gsub "revision 2", "revision 1" }

          it { is_expected.to match("revision should not decrease (from 2 to 1)") }
        end

        context "should be removed with a newer version" do
          before { formula_gsub_commit "foo-1.0.tar.gz", "foo-1.1.tar.gz" }

          it { is_expected.to match("'revision 2' should be removed") }
        end

        context "should not warn on an newer version revision removal" do
          before do
            formula_gsub_commit "revision 2", ""
            formula_gsub_commit "foo-1.0.tar.gz", "foo-1.1.tar.gz"
          end

          it { is_expected.to be_nil }
        end

        context "should only increment by 1 with an uncommitted version" do
          before do
            formula_gsub "foo-1.0.tar.gz", "foo-1.1.tar.gz"
            formula_gsub "revision 2", "revision 4"
          end

          it { is_expected.to match("revisions should only increment by 1") }
        end

        context "should not warn on past increment by more than 1" do
          before do
            formula_gsub_commit "revision 2", "# no revision"
            formula_gsub_commit "foo-1.0.tar.gz", "foo-1.1.tar.gz"
            formula_gsub_commit "# no revision", "revision 3"
          end

          it { is_expected.to be_nil }
        end
      end

      context "version_schemes" do
        context "should not decrease with the same version" do
          before { formula_gsub_commit "version_scheme 1" }

          it { is_expected.to match("version_scheme should not decrease (from 1 to 0)") }
        end

        context "should not decrease with a new version" do
          before do
            formula_gsub_commit "foo-1.0.tar.gz", "foo-1.1.tar.gz"
            formula_gsub_commit "version_scheme 1", ""
            formula_gsub_commit "revision 2", ""
          end

          it { is_expected.to match("version_scheme should not decrease (from 1 to 0)") }
        end

        context "should only increment by 1" do
          before do
            formula_gsub_commit "version_scheme 1", "# no version_scheme"
            formula_gsub_commit "foo-1.0.tar.gz", "foo-1.1.tar.gz"
            formula_gsub_commit "revision 2", ""
            formula_gsub_commit "# no version_scheme", "version_scheme 3"
          end

          it { is_expected.to match("version_schemes should only increment by 1") }
        end
      end

      context "versions" do
        context "uncommitted should not decrease" do
          before { formula_gsub "foo-1.0.tar.gz", "foo-0.9.tar.gz" }

          it { is_expected.to match("stable version should not decrease (from 1.0 to 0.9)") }
        end

        context "committed can decrease" do
          before do
            formula_gsub_commit "revision 2"
            formula_gsub_commit "foo-1.0.tar.gz", "foo-0.9.tar.gz"
          end

          it { is_expected.to be_nil }
        end

        context "can decrease with version_scheme increased" do
          before do
            formula_gsub "revision 2"
            formula_gsub "foo-1.0.tar.gz", "foo-0.9.tar.gz"
            formula_gsub "version_scheme 1", "version_scheme 2"
          end

          it { is_expected.to be_nil }
        end
      end
    end

    describe "#audit_url_is_not_binary" do
      specify "it detects a url containing darwin and x86_64" do
        fa = formula_auditor "foo", <<~RUBY, core_tap: true
          class Foo < Formula
            url "https://example.com/example-darwin.x86_64.tar.gz"
          end
        RUBY

        fa.audit_url_is_not_binary

        expect(fa.problems.first)
          .to match("looks like a binary package, not a source archive. The `core` tap is source-only.")
      end

      specify "it detects a url containing darwin and amd64" do
        fa = formula_auditor "foo", <<~RUBY, core_tap: true
          class Foo < Formula
            url "https://example.com/example-darwin.amd64.tar.gz"
          end
        RUBY

        fa.audit_url_is_not_binary

        expect(fa.problems.first)
          .to match("looks like a binary package, not a source archive. The `core` tap is source-only.")
      end

      specify "it works on the devel spec" do
        fa = formula_auditor "foo", <<~RUBY, core_tap: true
          class Foo < Formula
            url "https://example.com/valid-1.0.tar.gz"

            devel do
              url "https://example.com/example-darwin.x86_64.tar.gz"
            end
          end
        RUBY

        fa.audit_url_is_not_binary

        expect(fa.problems.first)
          .to match("looks like a binary package, not a source archive. The `core` tap is source-only.")
      end

      specify "it works on the head spec" do
        fa = formula_auditor "foo", <<~RUBY, core_tap: true
          class Foo < Formula
            url "https://example.com/valid-1.0.tar.gz"

            head do
              url "https://example.com/example-darwin.x86_64.tar.gz"
            end
          end
        RUBY

        fa.audit_url_is_not_binary

        expect(fa.problems.first)
          .to match("looks like a binary package, not a source archive. The `core` tap is source-only.")
      end

      specify "it ignores resource urls" do
        fa = formula_auditor "foo", <<~RUBY, core_tap: true
          class Foo < Formula
            url "https://example.com/valid-1.0.tar.gz"

            resource "binary_res" do
              url "https://example.com/example-darwin.x86_64.tar.gz"
            end
          end
        RUBY

        fa.audit_url_is_not_binary

        expect(fa.problems).to eq([])
      end
    end
  end
end