# frozen_string_literal: true

require 'spec_helper'

RSpec.describe Projects::CompareController do
  include ProjectForksHelper

  using RSpec::Parameterized::TableSyntax

  let_it_be(:project) { create(:project, :repository, :public) }
  let_it_be(:user) { create(:user) }

  let(:private_fork) { fork_project(project, nil, repository: true).tap { |fork| fork.update!(visibility: 'private') } }
  let(:public_fork) do
    fork_project(project, nil, repository: true).tap do |fork|
      fork.update!(visibility: 'public')
      # Create a reference that only exists in this project
      fork.repository.create_ref('refs/heads/improve/awesome', 'refs/heads/improve/more-awesome')
    end
  end

  before do
    sign_in(user)
    project.add_maintainer(user)
  end

  describe 'GET index' do
    render_views

    before do
      get :index, params: { namespace_id: project.namespace, project_id: project }
    end

    it 'returns successfully' do
      expect(response).to be_successful
    end
  end

  describe 'GET show' do
    render_views

    subject(:show_request) { get :show, params: request_params }

    let(:request_params) do
      {
        namespace_id: project.namespace,
        project_id: project,
        from_project_id: from_project_id,
        from: from_ref,
        to: to_ref,
        w: whitespace
      }
    end

    let(:whitespace) { nil }

    context 'when the refs exist in the same project' do
      context 'when we set the white space param' do
        let(:from_project_id) { nil }
        let(:from_ref) { '08f22f25' }
        let(:to_ref) { '66eceea0' }
        let(:whitespace) { 1 }

        it 'shows some diffs with ignore whitespace change option' do
          show_request

          expect(response).to be_successful
          diff_file = assigns(:diffs).diff_files.first
          expect(diff_file).not_to be_nil
          expect(assigns(:commits).length).to be >= 1
          # without whitespace option, there are more than 2 diff_splits
          diff_splits = diff_file.diff.diff.split("\n")
          expect(diff_splits.length).to be <= 2
        end
      end

      context 'when we do not set the white space param' do
        let(:from_project_id) { nil }
        let(:from_ref) { 'improve%2Fawesome' }
        let(:to_ref) { 'feature' }
        let(:whitespace) { nil }

        it 'sets the diffs and commits ivars' do
          show_request

          expect(response).to be_successful
          expect(assigns(:diffs).diff_files.first).not_to be_nil
          expect(assigns(:commits).length).to be >= 1
        end
      end
    end

    context 'when the refs exist in different projects that the user can see' do
      let(:from_project_id) { public_fork.id }
      let(:from_ref) { 'improve%2Fmore-awesome' }
      let(:to_ref) { 'feature' }
      let(:whitespace) { nil }

      it 'shows the diff' do
        show_request

        expect(response).to be_successful
        expect(assigns(:diffs).diff_files.first).not_to be_nil
        expect(assigns(:commits).length).to be >= 1
      end
    end

    context 'when the refs exist in different projects but the user cannot see' do
      let(:from_project_id) { private_fork.id }
      let(:from_ref) { 'improve%2Fmore-awesome' }
      let(:to_ref) { 'feature' }
      let(:whitespace) { nil }

      it 'does not show the diff' do
        show_request

        expect(response).to be_successful
        expect(assigns(:diffs)).to be_empty
        expect(assigns(:commits)).to be_empty
      end
    end

    context 'when the source ref does not exist' do
      let(:from_project_id) { nil }
      let(:from_ref) { 'non-existent-source-ref' }
      let(:to_ref) { 'feature' }

      it 'sets empty diff and commit ivars' do
        show_request

        expect(response).to be_successful
        expect(assigns(:diffs)).to eq([])
        expect(assigns(:commits)).to eq([])
      end
    end

    context 'when the target ref does not exist' do
      let(:from_project_id) { nil }
      let(:from_ref) { 'improve%2Fawesome' }
      let(:to_ref) { 'non-existent-target-ref' }

      it 'sets empty diff and commit ivars' do
        show_request

        expect(response).to be_successful
        expect(assigns(:diffs)).to eq([])
        expect(assigns(:commits)).to eq([])
      end
    end

    context 'when the target ref is invalid' do
      let(:from_project_id) { nil }
      let(:from_ref) { 'improve%2Fawesome' }
      let(:to_ref) { "master%' AND 2554=4423 AND '%'='" }

      it 'shows a flash message and redirects' do
        show_request

        expect(flash[:alert]).to eq("Invalid branch name(s): master%' AND 2554=4423 AND '%'='")
        expect(response).to have_gitlab_http_status(:found)
      end
    end

    context 'when the source ref is invalid' do
      let(:from_project_id) { nil }
      let(:from_ref) { "master%' AND 2554=4423 AND '%'='" }
      let(:to_ref) { 'improve%2Fawesome' }

      it 'shows a flash message and redirects' do
        show_request

        expect(flash[:alert]).to eq("Invalid branch name(s): master%' AND 2554=4423 AND '%'='")
        expect(response).to have_gitlab_http_status(:found)
      end
    end

    context 'when the both refs are invalid' do
      let(:from_project_id) { nil }
      let(:from_ref) { "master%' AND 2554=4423 AND '%'='" }
      let(:to_ref) { "improve%' =,awesome" }

      it 'shows a flash message and redirects' do
        show_request

        expect(flash[:alert]).to eq("Invalid branch name(s): improve%' =,awesome, master%' AND 2554=4423 AND '%'='")
        expect(response).to have_gitlab_http_status(:found)
      end
    end
  end

  describe 'GET diff_for_path' do
    subject(:diff_for_path_request) { get :diff_for_path, params: request_params }

    let(:request_params) do
      {
        from_project_id: from_project_id,
        from: from_ref,
        to: to_ref,
        namespace_id: project.namespace,
        project_id: project,
        old_path: old_path,
        new_path: new_path
      }
    end

    let(:existing_path) { 'files/ruby/feature.rb' }

    let(:from_project_id) { nil }
    let(:from_ref) { 'improve%2Fawesome' }
    let(:to_ref) { 'feature' }
    let(:old_path) { existing_path }
    let(:new_path) { existing_path }

    context 'when the source and target refs exist in the same project' do
      context 'when the user has access target the project' do
        context 'when the path exists in the diff' do
          it 'disables diff notes' do
            diff_for_path_request

            expect(assigns(:diff_notes_disabled)).to be_truthy
          end

          it 'only renders the diffs for the path given' do
            expect(controller).to receive(:render_diff_for_path).and_wrap_original do |meth, diffs|
              expect(diffs.diff_files.map(&:new_path)).to contain_exactly(existing_path)
              meth.call(diffs)
            end

            diff_for_path_request
          end
        end

        context 'when the path does not exist in the diff' do
          let(:old_path) { existing_path.succ }
          let(:new_path) { existing_path.succ }

          it 'returns a 404' do
            diff_for_path_request

            expect(response).to have_gitlab_http_status(:not_found)
          end
        end
      end

      context 'when the user does not have access target the project' do
        before do
          project.team.truncate
        end

        it 'returns a 404' do
          diff_for_path_request

          expect(response).to have_gitlab_http_status(:not_found)
        end
      end
    end

    context 'when the source and target refs exist in different projects and the user can see' do
      let(:from_project_id) { public_fork.id }
      let(:from_ref) { 'improve%2Fmore-awesome' }

      it 'shows the diff for that path' do
        expect(controller).to receive(:render_diff_for_path).and_wrap_original do |meth, diffs|
          expect(diffs.diff_files.map(&:new_path)).to contain_exactly(existing_path)
          meth.call(diffs)
        end

        diff_for_path_request
      end
    end

    context 'when the source and target refs exist in different projects and the user cannot see' do
      let(:from_project_id) { private_fork.id }

      it 'does not show the diff for that path' do
        diff_for_path_request

        expect(response).to have_gitlab_http_status(:not_found)
      end
    end

    context 'when the source ref does not exist' do
      let(:from_ref) { 'this-ref-does-not-exist' }

      it 'returns a 404' do
        diff_for_path_request

        expect(response).to have_gitlab_http_status(:not_found)
      end
    end

    context 'when the target ref does not exist' do
      let(:to_ref) { 'this-ref-does-not-exist' }

      it 'returns a 404' do
        diff_for_path_request

        expect(response).to have_gitlab_http_status(:not_found)
      end
    end
  end

  describe 'POST create' do
    subject(:create_request) { post :create, params: request_params }

    let(:request_params) do
      {
        namespace_id: project.namespace,
        project_id: project,
        from_project_id: from_project_id,
        from: from_ref,
        to: to_ref
      }
    end

    context 'when sending valid params' do
      let(:from_ref) { 'awesome%2Ffeature' }
      let(:to_ref) { 'feature' }

      context 'without a from_project_id' do
        let(:from_project_id) { nil }

        it 'redirects to the show page' do
          create_request

          expect(response).to redirect_to(project_compare_path(project, from: from_ref, to: to_ref))
        end
      end

      context 'with a from_project_id' do
        let(:from_project_id) { 'something or another' }

        it 'redirects to the show page without interpreting from_project_id' do
          create_request

          expect(response).to redirect_to(project_compare_path(project, from: from_ref, to: to_ref, from_project_id: from_project_id))
        end
      end
    end

    context 'when sending invalid params' do
      where(:from_ref, :to_ref, :from_project_id, :expected_redirect_params) do
        ''     | ''     | ''  | {}
        'main' | ''     | ''  | { from: 'main' }
        ''     | 'main' | ''  | { to: 'main' }
        ''     | ''     | '1' | { from_project_id: 1 }
        'main' | ''     | '1' | { from: 'main', from_project_id: 1 }
        ''     | 'main' | '1' | { to: 'main', from_project_id: 1 }
      end

      with_them do
        let(:expected_redirect) { project_compare_index_path(project, expected_redirect_params) }

        it 'redirects back to the index' do
          create_request

          expect(response).to redirect_to(expected_redirect)
        end
      end
    end
  end

  describe 'GET signatures' do
    subject(:signatures_request) { get :signatures, params: request_params }

    let(:request_params) do
      {
        namespace_id: project.namespace,
        project_id: project,
        from: from_ref,
        to: to_ref,
        format: :json
      }
    end

    context 'when the source and target refs exist' do
      let(:from_ref) { 'improve%2Fawesome' }
      let(:to_ref) { 'feature' }

      context 'when the user has access to the project' do
        render_views

        let(:signature_commit) { project.commit_by(oid: '0b4bc9a49b562e85de7cc9e834518ea6828729b9') }
        let(:non_signature_commit) { build(:commit, project: project, safe_message: "message", sha: 'non_signature_commit') }

        before do
          escaped_from_ref = Addressable::URI.unescape(from_ref)
          escaped_to_ref = Addressable::URI.unescape(to_ref)

          compare_service = CompareService.new(project, escaped_to_ref)
          compare = compare_service.execute(project, escaped_from_ref)

          expect(CompareService).to receive(:new).with(project, escaped_to_ref).and_return(compare_service)
          expect(compare_service).to receive(:execute).with(project, escaped_from_ref).and_return(compare)

          expect(compare).to receive(:commits).and_return([signature_commit, non_signature_commit])
          expect(non_signature_commit).to receive(:has_signature?).and_return(false)
        end

        it 'returns only the commit with a signature' do
          signatures_request

          expect(response).to have_gitlab_http_status(:ok)
          signatures = json_response['signatures']

          expect(signatures.size).to eq(1)
          expect(signatures.first['commit_sha']).to eq(signature_commit.sha)
          expect(signatures.first['html']).to be_present
        end
      end

      context 'when the user does not have access to the project' do
        before do
          project.team.truncate
          project.update!(visibility: 'private')
        end

        it 'returns a 404' do
          signatures_request

          expect(response).to have_gitlab_http_status(:not_found)
        end
      end
    end

    context 'when the source ref does not exist' do
      let(:from_ref) { 'non-existent-ref-source' }
      let(:to_ref) { 'feature' }

      it 'returns no signatures' do
        signatures_request

        expect(response).to have_gitlab_http_status(:ok)
        expect(json_response['signatures']).to be_empty
      end
    end

    context 'when the target ref does not exist' do
      let(:from_ref) { 'improve%2Fawesome' }
      let(:to_ref) { 'non-existent-ref-target' }

      it 'returns no signatures' do
        signatures_request

        expect(response).to have_gitlab_http_status(:ok)
        expect(json_response['signatures']).to be_empty
      end
    end
  end
end