# frozen_string_literal: true

require 'spec_helper'

RSpec.describe 'getting an issue list for a project' do
  include GraphqlHelpers

  let_it_be(:project) { create(:project, :repository, :public) }
  let_it_be(:current_user) { create(:user) }
  let_it_be(:issue_a, reload: true) { create(:issue, project: project, discussion_locked: true) }
  let_it_be(:issue_b, reload: true) { create(:issue, :with_alert, project: project) }
  let_it_be(:issues, reload: true) { [issue_a, issue_b] }

  let(:issues_data) { graphql_data['project']['issues']['edges'] }
  let(:issue_filter_params) { {} }

  let(:fields) do
    <<~QUERY
    edges {
      node {
        #{all_graphql_fields_for('issues'.classify)}
      }
    }
    QUERY
  end

  let(:query) do
    graphql_query_for(
      'project',
      { 'fullPath' => project.full_path },
      query_graphql_field('issues', issue_filter_params, fields)
    )
  end

  it_behaves_like 'a working graphql query' do
    before do
      post_graphql(query, current_user: current_user)
    end
  end

  it 'includes a web_url' do
    post_graphql(query, current_user: current_user)

    expect(issues_data[0]['node']['webUrl']).to be_present
  end

  it 'includes discussion locked' do
    post_graphql(query, current_user: current_user)

    expect(issues_data[0]['node']['discussionLocked']).to eq(false)
    expect(issues_data[1]['node']['discussionLocked']).to eq(true)
  end

  context 'when both assignee_username filters are provided' do
    let(:issue_filter_params) { { assignee_username: current_user.username, assignee_usernames: [current_user.username] } }

    it 'returns a mutually exclusive param error' do
      post_graphql(query, current_user: current_user)

      expect_graphql_errors_to_include('only one of [assigneeUsernames, assigneeUsername] arguments is allowed at the same time.')
    end
  end

  context 'when limiting the number of results' do
    let(:query) do
      <<~GQL
        query($path: ID!, $n: Int) {
          project(fullPath: $path) {
            issues(first: $n) { #{fields} }
          }
        }
      GQL
    end

    let(:issue_limit) { 1 }
    let(:variables) do
      { path: project.full_path, n: issue_limit }
    end

    it_behaves_like 'a working graphql query' do
      before do
        post_graphql(query, current_user: current_user, variables: variables)
      end

      it 'only returns N issues' do
        expect(issues_data.size).to eq(issue_limit)
      end
    end

    context 'when no limit is provided' do
      let(:issue_limit) { nil }

      it 'returns all issues' do
        post_graphql(query, current_user: current_user, variables: variables)

        expect(issues_data.size).to be > 1
      end
    end

    it 'is expected to check permissions on the first issue only' do
      allow(Ability).to receive(:allowed?).and_call_original
      # Newest first, we only want to see the newest checked
      expect(Ability).not_to receive(:allowed?).with(current_user, :read_issue, issues.first)

      post_graphql(query, current_user: current_user, variables: variables)
    end
  end

  context 'when the user does not have access to the issue' do
    it 'returns nil' do
      project.project_feature.update!(issues_access_level: ProjectFeature::PRIVATE)

      post_graphql(query)

      expect(issues_data).to eq([])
    end
  end

  context 'when there is a confidential issue' do
    let_it_be(:confidential_issue) do
      create(:issue, :confidential, project: project)
    end

    context 'when the user cannot see confidential issues' do
      it 'returns issues without confidential issues' do
        post_graphql(query, current_user: current_user)

        expect(issues_data.size).to eq(2)

        issues_data.each do |issue|
          expect(issue.dig('node', 'confidential')).to eq(false)
        end
      end
    end

    context 'when the user can see confidential issues' do
      it 'returns issues with confidential issues' do
        project.add_developer(current_user)

        post_graphql(query, current_user: current_user)

        expect(issues_data.size).to eq(3)

        confidentials = issues_data.map do |issue|
          issue.dig('node', 'confidential')
        end

        expect(confidentials).to eq([true, false, false])
      end
    end
  end

  describe 'sorting and pagination' do
    let_it_be(:data_path) { [:project, :issues] }

    def pagination_query(params)
      graphql_query_for(
        :project,
        { full_path: sort_project.full_path },
        query_graphql_field(:issues, params, "#{page_info} nodes { iid }")
      )
    end

    def pagination_results_data(data)
      data.map { |issue| issue['iid'].to_i }
    end

    context 'when sorting by due date' do
      let_it_be(:sort_project) { create(:project, :public) }
      let_it_be(:due_issue1) { create(:issue, project: sort_project, due_date: 3.days.from_now) }
      let_it_be(:due_issue2) { create(:issue, project: sort_project, due_date: nil) }
      let_it_be(:due_issue3) { create(:issue, project: sort_project, due_date: 2.days.ago) }
      let_it_be(:due_issue4) { create(:issue, project: sort_project, due_date: nil) }
      let_it_be(:due_issue5) { create(:issue, project: sort_project, due_date: 1.day.ago) }

      context 'when ascending' do
        it_behaves_like 'sorted paginated query' do
          let(:sort_param)       { :DUE_DATE_ASC }
          let(:first_param)      { 2 }
          let(:expected_results) { [due_issue3.iid, due_issue5.iid, due_issue1.iid, due_issue4.iid, due_issue2.iid] }
        end
      end

      context 'when descending' do
        it_behaves_like 'sorted paginated query' do
          let(:sort_param)       { :DUE_DATE_DESC }
          let(:first_param)      { 2 }
          let(:expected_results) { [due_issue1.iid, due_issue5.iid, due_issue3.iid, due_issue4.iid, due_issue2.iid] }
        end
      end
    end

    context 'when sorting by relative position' do
      let_it_be(:sort_project) { create(:project, :public) }
      let_it_be(:relative_issue1) { create(:issue, project: sort_project, relative_position: 2000) }
      let_it_be(:relative_issue2) { create(:issue, project: sort_project, relative_position: nil) }
      let_it_be(:relative_issue3) { create(:issue, project: sort_project, relative_position: 1000) }
      let_it_be(:relative_issue4) { create(:issue, project: sort_project, relative_position: nil) }
      let_it_be(:relative_issue5) { create(:issue, project: sort_project, relative_position: 500) }

      context 'when ascending' do
        it_behaves_like 'sorted paginated query' do
          let(:sort_param)       { :RELATIVE_POSITION_ASC }
          let(:first_param)      { 2 }
          let(:expected_results) do
            [
              relative_issue5.iid, relative_issue3.iid, relative_issue1.iid,
              relative_issue4.iid, relative_issue2.iid
            ]
          end
        end
      end
    end

    context 'when sorting by priority' do
      let_it_be(:sort_project) { create(:project, :public) }
      let_it_be(:on_project) { { project: sort_project } }
      let_it_be(:early_milestone) { create(:milestone, **on_project, due_date: 10.days.from_now) }
      let_it_be(:late_milestone) { create(:milestone, **on_project, due_date: 30.days.from_now) }
      let_it_be(:priority_1) { create(:label, **on_project, priority: 1) }
      let_it_be(:priority_2) { create(:label, **on_project, priority: 5) }
      let_it_be(:priority_issue1) { create(:issue, **on_project, labels: [priority_1], milestone: late_milestone) }
      let_it_be(:priority_issue2) { create(:issue, **on_project, labels: [priority_2]) }
      let_it_be(:priority_issue3) { create(:issue, **on_project, milestone: early_milestone) }
      let_it_be(:priority_issue4) { create(:issue, **on_project) }

      context 'when ascending' do
        it_behaves_like 'sorted paginated query' do
          let(:sort_param)       { :PRIORITY_ASC }
          let(:first_param)      { 2 }
          let(:expected_results) do
            [
              priority_issue3.iid, priority_issue1.iid,
              priority_issue2.iid, priority_issue4.iid
            ]
          end
        end
      end

      context 'when descending' do
        it_behaves_like 'sorted paginated query' do
          let(:sort_param)       { :PRIORITY_DESC }
          let(:first_param)      { 2 }
          let(:expected_results) do
            [priority_issue1.iid, priority_issue3.iid, priority_issue2.iid, priority_issue4.iid]
          end
        end
      end
    end

    context 'when sorting by label priority' do
      let_it_be(:sort_project) { create(:project, :public) }
      let_it_be(:label1) { create(:label, project: sort_project, priority: 1) }
      let_it_be(:label2) { create(:label, project: sort_project, priority: 5) }
      let_it_be(:label3) { create(:label, project: sort_project, priority: 10) }
      let_it_be(:label_issue1) { create(:issue, project: sort_project, labels: [label1]) }
      let_it_be(:label_issue2) { create(:issue, project: sort_project, labels: [label2]) }
      let_it_be(:label_issue3) { create(:issue, project: sort_project, labels: [label1, label3]) }
      let_it_be(:label_issue4) { create(:issue, project: sort_project) }

      context 'when ascending' do
        it_behaves_like 'sorted paginated query' do
          let(:sort_param)       { :LABEL_PRIORITY_ASC }
          let(:first_param)      { 2 }
          let(:expected_results) { [label_issue3.iid, label_issue1.iid, label_issue2.iid, label_issue4.iid] }
        end
      end

      context 'when descending' do
        it_behaves_like 'sorted paginated query' do
          let(:sort_param)       { :LABEL_PRIORITY_DESC }
          let(:first_param)      { 2 }
          let(:expected_results) { [label_issue2.iid, label_issue3.iid, label_issue1.iid, label_issue4.iid] }
        end
      end
    end

    context 'when sorting by milestone due date' do
      let_it_be(:sort_project)     { create(:project, :public) }
      let_it_be(:early_milestone)  { create(:milestone, project: sort_project, due_date: 10.days.from_now) }
      let_it_be(:late_milestone)   { create(:milestone, project: sort_project, due_date: 30.days.from_now) }
      let_it_be(:milestone_issue1) { create(:issue, project: sort_project) }
      let_it_be(:milestone_issue2) { create(:issue, project: sort_project, milestone: early_milestone) }
      let_it_be(:milestone_issue3) { create(:issue, project: sort_project, milestone: late_milestone) }

      context 'when ascending' do
        it_behaves_like 'sorted paginated query' do
          let(:sort_param)       { :MILESTONE_DUE_ASC }
          let(:first_param)      { 2 }
          let(:expected_results) { [milestone_issue2.iid, milestone_issue3.iid, milestone_issue1.iid] }
        end
      end

      context 'when descending' do
        it_behaves_like 'sorted paginated query' do
          let(:sort_param)       { :MILESTONE_DUE_DESC }
          let(:first_param)      { 2 }
          let(:expected_results) { [milestone_issue3.iid, milestone_issue2.iid, milestone_issue1.iid] }
        end
      end
    end
  end

  context 'when fetching alert management alert' do
    let(:fields) do
      <<~QUERY
      edges {
        node {
          iid
          alertManagementAlert {
            title
          }
        }
      }
      QUERY
    end

    # Alerts need to have developer permission and above
    before do
      project.add_developer(current_user)
    end

    it 'avoids N+1 queries' do
      control = ActiveRecord::QueryRecorder.new { post_graphql(query, current_user: current_user) }

      create(:alert_management_alert, :with_incident, project: project)

      expect { post_graphql(query, current_user: current_user) }.not_to exceed_query_limit(control)
    end

    it 'returns the alert data' do
      post_graphql(query, current_user: current_user)

      alert_titles = issues_data.map { |issue| issue.dig('node', 'alertManagementAlert', 'title') }
      expected_titles = issues.map { |issue| issue.alert_management_alert&.title }

      expect(alert_titles).to contain_exactly(*expected_titles)
    end
  end

  context 'when fetching labels' do
    let(:fields) do
      <<~QUERY
        edges {
          node {
            id
            labels {
              nodes {
                id
              }
            }
          }
        }
      QUERY
    end

    before do
      issues.each do |issue|
        # create a label for each issue we have to properly test N+1
        label = create(:label, project: project)
        issue.update!(labels: [label])
      end
    end

    def response_label_ids(response_data)
      response_data.map do |edge|
        edge['node']['labels']['nodes'].map { |u| u['id'] }
      end.flatten
    end

    def labels_as_global_ids(issues)
      issues.map(&:labels).flatten.map(&:to_global_id).map(&:to_s)
    end

    it 'avoids N+1 queries', :aggregate_failures do
      control = ActiveRecord::QueryRecorder.new { post_graphql(query, current_user: current_user) }
      expect(issues_data.count).to eq(2)
      expect(response_label_ids(issues_data)).to match_array(labels_as_global_ids(issues))

      new_issues = issues + [create(:issue, project: project, labels: [create(:label, project: project)])]

      expect { post_graphql(query, current_user: current_user) }.not_to exceed_query_limit(control)
      # graphql_data is memoized (see spec/support/helpers/graphql_helpers.rb)
      # so we have to parse the body ourselves the second time
      issues_data = Gitlab::Json.parse(response.body)['data']['project']['issues']['edges']
      expect(issues_data.count).to eq(3)
      expect(response_label_ids(issues_data)).to match_array(labels_as_global_ids(new_issues))
    end
  end

  context 'when fetching assignees' do
    let(:fields) do
      <<~QUERY
        edges {
          node {
            id
            assignees {
              nodes {
                id
              }
            }
          }
        }
      QUERY
    end

    before do
      issues.each do |issue|
        # create an assignee for each issue we have to properly test N+1
        assignee = create(:user)
        issue.update!(assignees: [assignee])
      end
    end

    def response_assignee_ids(response_data)
      response_data.map do |edge|
        edge['node']['assignees']['nodes'].map { |node| node['id'] }
      end.flatten
    end

    def assignees_as_global_ids(issues)
      issues.map(&:assignees).flatten.map(&:to_global_id).map(&:to_s)
    end

    it 'avoids N+1 queries', :aggregate_failures do
      control = ActiveRecord::QueryRecorder.new { post_graphql(query, current_user: current_user) }
      expect(issues_data.count).to eq(2)
      expect(response_assignee_ids(issues_data)).to match_array(assignees_as_global_ids(issues))

      new_issues = issues + [create(:issue, project: project, assignees: [create(:user)])]

      expect { post_graphql(query, current_user: current_user) }.not_to exceed_query_limit(control)
      # graphql_data is memoized (see spec/support/helpers/graphql_helpers.rb)
      # so we have to parse the body ourselves the second time
      issues_data = Gitlab::Json.parse(response.body)['data']['project']['issues']['edges']
      expect(issues_data.count).to eq(3)
      expect(response_assignee_ids(issues_data)).to match_array(assignees_as_global_ids(new_issues))
    end
  end

  describe 'N+1 query checks' do
    let(:extra_iid_for_second_query) { issue_b.iid.to_s }
    let(:search_params) { { iids: [issue_a.iid.to_s] } }

    def execute_query
      query = graphql_query_for(
        :project,
        { full_path: project.full_path },
        query_graphql_field(
          :issues, search_params,
          query_graphql_field(:nodes, nil, requested_fields)
        )
      )
      post_graphql(query, current_user: current_user)
    end

    context 'when requesting `user_notes_count`' do
      let(:requested_fields) { [:user_notes_count] }

      before do
        create_list(:note_on_issue, 2, noteable: issue_a, project: project)
        create(:note_on_issue, noteable: issue_b, project: project)
      end

      include_examples 'N+1 query check'
    end

    context 'when requesting `user_discussions_count`' do
      let(:requested_fields) { [:user_discussions_count] }

      before do
        create_list(:note_on_issue, 2, noteable: issue_a, project: project)
        create(:note_on_issue, noteable: issue_b, project: project)
      end

      include_examples 'N+1 query check'
    end

    context 'when requesting `merge_requests_count`' do
      let(:requested_fields) { [:merge_requests_count] }

      before do
        create_list(:merge_requests_closing_issues, 2, issue: issue_a)
        create_list(:merge_requests_closing_issues, 3, issue: issue_b)
      end

      include_examples 'N+1 query check'
    end

    context 'when requesting `timelogs`' do
      let(:requested_fields) { 'timelogs { nodes { timeSpent } }' }

      before do
        create_list(:issue_timelog, 2, issue: issue_a)
        create(:issue_timelog, issue: issue_b)
      end

      include_examples 'N+1 query check'
    end
  end
end
