require "patch"

describe Patch do
  describe "#create" do
    context "simple patch" do
      subject { described_class.create(:p2, nil) }
      it { is_expected.to be_kind_of ExternalPatch }
      it { is_expected.to be_external }
      its(:strip) { is_expected.to eq(:p2) }
    end

    context "string patch" do
      subject { described_class.create(:p0, "foo") }
      it { is_expected.to be_kind_of StringPatch }
      its(:strip) { is_expected.to eq(:p0) }
    end

    context "string patch without strip" do
      subject { described_class.create("foo", nil) }
      it { is_expected.to be_kind_of StringPatch }
      its(:strip) { is_expected.to eq(:p1) }
    end

    context "data patch" do
      subject { described_class.create(:p0, :DATA) }
      it { is_expected.to be_kind_of DATAPatch }
      its(:strip) { is_expected.to eq(:p0) }
    end

    context "data patch without strip" do
      subject { described_class.create(:DATA, nil) }
      it { is_expected.to be_kind_of DATAPatch }
      its(:strip) { is_expected.to eq(:p1) }
    end

    it "raises an error for unknown values" do
      expect {
        described_class.create(Object.new)
      }.to raise_error(ArgumentError)

      expect {
        described_class.create(Object.new, Object.new)
      }.to raise_error(ArgumentError)
    end
  end

  describe "#patch_files" do
    subject { described_class.create(:p2, nil) }

    context "empty patch" do
      its(:resource) { is_expected.to be_kind_of Resource::PatchResource }
      its(:patch_files) { is_expected.to eq(subject.resource.patch_files) }
      its(:patch_files) { is_expected.to eq([]) }
    end

    it "returns applied patch files" do
      subject.resource.apply("patch1.diff")
      expect(subject.patch_files).to eq(["patch1.diff"])

      subject.resource.apply("patch2.diff", "patch3.diff")
      expect(subject.patch_files).to eq(["patch1.diff", "patch2.diff", "patch3.diff"])

      subject.resource.apply(["patch4.diff", "patch5.diff"])
      expect(subject.patch_files.count).to eq(5)

      subject.resource.apply("patch4.diff", ["patch5.diff", "patch6.diff"], "patch7.diff")
      expect(subject.patch_files.count).to eq(7)
    end
  end

  describe "#normalize_legacy_patches" do
    it "can create a patch from a single string" do
      patches = described_class.normalize_legacy_patches("http://example.com/patch.diff")
      expect(patches.length).to eq(1)
      expect(patches.first.strip).to eq(:p1)
    end

    it "can create patches from an array" do
      patches = described_class.normalize_legacy_patches(
        %w[http://example.com/patch1.diff http://example.com/patch2.diff],
      )

      expect(patches.length).to eq(2)
      expect(patches[0].strip).to eq(:p1)
      expect(patches[1].strip).to eq(:p1)
    end

    it "can create patches from a :p0 hash" do
      patches = Patch.normalize_legacy_patches(
        p0: "http://example.com/patch.diff",
      )

      expect(patches.length).to eq(1)
      expect(patches.first.strip).to eq(:p0)
    end

    it "can create patches from a :p1 hash" do
      patches = Patch.normalize_legacy_patches(
        p1: "http://example.com/patch.diff",
      )

      expect(patches.length).to eq(1)
      expect(patches.first.strip).to eq(:p1)
    end

    it "can create patches from a mixed hash" do
      patches = Patch.normalize_legacy_patches(
        p1: "http://example.com/patch1.diff",
        p0: "http://example.com/patch0.diff",
      )

      expect(patches.length).to eq(2)
      expect(patches.count { |p| p.strip == :p0 }).to eq(1)
      expect(patches.count { |p| p.strip == :p1 }).to eq(1)
    end

    it "can create patches from a mixed hash with array" do
      patches = Patch.normalize_legacy_patches(
        p1: [
          "http://example.com/patch10.diff",
          "http://example.com/patch11.diff",
        ],
        p0: [
          "http://example.com/patch00.diff",
          "http://example.com/patch01.diff",
        ],
      )

      expect(patches.length).to eq(4)
      expect(patches.count { |p| p.strip == :p0 }).to eq(2)
      expect(patches.count { |p| p.strip == :p1 }).to eq(2)
    end

    it "returns an empty array if given nil" do
      expect(Patch.normalize_legacy_patches(nil)).to be_empty
    end
  end
end

describe EmbeddedPatch do
  describe "#new" do
    subject { described_class.new(:p1) }
    its(:inspect) { is_expected.to eq("#<EmbeddedPatch: :p1>") }
  end
end

describe ExternalPatch do
  subject { described_class.new(:p1) { url "file:///my.patch" } }

  describe "#url" do
    its(:url) { is_expected.to eq("file:///my.patch") }
  end

  describe "#inspect" do
    its(:inspect) { is_expected.to eq('#<ExternalPatch: :p1 "file:///my.patch">') }
  end

  describe "#cached_download" do
    before(:each) do
      allow(subject.resource).to receive(:cached_download).and_return("/tmp/foo.tar.gz")
    end

    its(:cached_download) { is_expected.to eq("/tmp/foo.tar.gz") }
  end
end