# frozen_string_literal: true

require "guard/guardfile/evaluator"

# TODO: shouldn't be necessary
require "guard"

RSpec.describe Guard::Guardfile::Evaluator do
  let(:options) { {} }
  subject { described_class.new(options) }

  let!(:local_guardfile) { Pathname("Guardfile").to_s }
  let!(:home_guardfile) { Pathname("~/.Guardfile").expand_path.to_s }
  let!(:home_config) { Pathname("~/.guard.rb").expand_path.to_s }

  let(:valid_guardfile_string) { "group :foo; do guard :bar; end; end; " }

  let(:dsl) { instance_double("Guard::Dsl") }

  let(:rel_guardfile) do
    Pathname("../relative_path_to_Guardfile").expand_path.to_s
  end

  before do
    allow(Guard::Interactor).to receive(:new).with(false)
    allow(Guard::Dsl).to receive(:new).and_return(dsl)
    allow(dsl).to receive(:instance_eval)
    stub_pathname
  end

  describe ".evaluate" do
    describe "error cases" do
      context "with an invalid Guardfile" do
        let(:options) { { contents: "guard :foo Bad Guardfile" } }

        it "displays an error message and raises original exception" do
          stub_user_guard_rb

          allow(dsl).to receive(:evaluate)
            .and_raise(Guard::Dsl::Error,
                       "Invalid Guardfile, original error is:")

          expect { subject.evaluate }.to raise_error(Guard::Dsl::Error)
        end
      end

      context "with no Guardfile at all" do
        it "displays an error message and exits" do
          stub_guardfile_rb
          stub_guardfile
          stub_user_guardfile
          stub_user_project_guardfile

          expect { subject.evaluate }
            .to raise_error(Guard::Guardfile::Evaluator::NoGuardfileError)
        end
      end

      context "with Guardfile as guardfile.rb" do
        it "evalutates guardfile.rb" do
          stub_guardfile_rb("guard :bar")
          allow(dsl).to receive(:evaluate).with("guard :bar", "", 1)
        end
      end

      context "with a problem reading a Guardfile" do
        let(:path) { File.expand_path("Guardfile") }

        before do
          stub_user_project_guardfile
          stub_guardfile_rb
          stub_guardfile(" ") do
            fail Errno::EACCES.new("permission error")
          end
        end

        it "displays an error message and exits" do
          expect(Guard::UI).to receive(:error).with(/^Error reading file/)
          expect { subject.evaluate }.to raise_error(SystemExit)
        end
      end

      context "with empty Guardfile content" do
        let(:options) { { contents: "" } }

        it "displays an error message about no plugins" do
          stub_user_guard_rb
          stub_guardfile(" ")
          allow(dsl).to receive(:evaluate).with("", "", 1)

          expect { subject.evaluate }
            .to raise_error(Guard::Guardfile::Evaluator::NoPluginsError)
        end
      end

      context "when provided :contents is nil" do
        before do
          # Anything
          stub_guardfile("guard :foo")

          stub_guardfile_rb
          stub_user_guard_rb
          stub_user_project_guardfile
          stub_user_guardfile
        end

        it "does not raise error and skip it" do
          allow(dsl).to receive(:evaluate).with("guard :foo", anything, 1)

          expect(Guard::UI).to_not receive(:error)
          expect do
            described_class.new(contents: nil).evaluate
          end.to_not raise_error
        end
      end

      context "with a non-existing Guardfile given" do
        let(:non_existing_path) { "/non/existing/path/to/Guardfile" }
        let(:options) { { guardfile: non_existing_path } }

        before do
          stub_file(non_existing_path)
        end

        it "raises error" do
          expect { subject.evaluate }
            .to raise_error(Guard::Guardfile::Evaluator::NoCustomGuardfile)
        end
      end
    end

    describe "selection of the Guardfile data contents" do
      context "with a valid :contents option" do
        before do
          stub_user_guard_rb
          allow(dsl).to receive(:evaluate)
        end

        context "with inline content and other Guardfiles available" do
          let(:inline_code) { "guard :foo" }
          let(:options) do
            {
              contents: inline_code,
              guardfile: "/abc/Guardfile"
            }
          end

          before do
            stub_file("/abc/Guardfile", "guard :bar")
            stub_guardfile_rb("guard :baz")
            stub_guardfile("guard :baz")
            stub_user_guardfile("guard :buz")
          end

          it "gives ultimate precedence to inline content" do
            expect(dsl).to receive(:evaluate).with(inline_code, "", 1)
            subject.evaluate
          end
        end
      end

      context "with the :guardfile option" do
        let(:options) { { guardfile: "../relative_path_to_Guardfile" } }

        before do
          stub_file(File.expand_path("../relative_path_to_Guardfile"),
                    valid_guardfile_string)
          allow(dsl).to receive(:evaluate)
            .with(valid_guardfile_string, anything, 1)
        end
      end
    end
  end

  describe "#inline?" do
    before do
      allow(dsl).to receive(:evaluate)
      stub_guardfile("guard :bar")
      stub_guardfile_rb
      stub_user_guard_rb
      subject.evaluate
    end

    context "when guardfile_contents is provided" do
      let(:options) { { guardfile_contents: "guard :foo" } }
      it { is_expected.to be_inline }
    end

    context "when contents is provided" do
      let(:options) { { contents: "guard :foo" } }
      it { is_expected.to be_inline }
    end

    context "when no content is provided" do
      let(:options) { {} }
      it { is_expected.to_not be_inline }
    end
  end

  describe ".guardfile_include?" do
    subject do
      evaluator = described_class.new(options)
      evaluator.evaluate
      evaluator
    end

    let(:dsl_reader) { instance_double(Guard::DslReader) }

    before do
      allow(dsl).to receive(:evaluate)
      allow(Guard::DslReader).to receive(:new).and_return(dsl_reader)
      allow(dsl_reader).to receive(:evaluate)
      stub_user_guard_rb
    end

    context "when plugin is present" do
      let(:options) { { contents: 'guard "test" {watch("c")}' } }

      it "returns true" do
        allow(dsl_reader)
          .to receive(:evaluate).with('guard "test" {watch("c")}', "", 1)

        allow(dsl_reader).to receive(:plugin_names).and_return(["test"])
        expect(subject).to be_guardfile_include("test")
      end
    end

    context "when plugin is not present" do
      let(:options) { { contents: 'guard "other" {watch("c")}' } }

      it "returns false" do
        allow(dsl_reader)
          .to receive(:evaluate).with('guard "test" {watch("c")}', "", 1)

        allow(dsl_reader).to receive(:plugin_names).and_return(["other"])
        expect(subject).to_not be_guardfile_include("test")
      end
    end
  end
end