# frozen_string_literal: true

require 'spec_helper'

RSpec.describe Gitlab::BackgroundMigration::BackfillHasRemediationsOfVulnerabilityReads,
  feature_category: :database do
  let(:namespaces) { table(:namespaces) }
  let(:projects) { table(:projects) }
  let(:users) { table(:users) }
  let(:scanners) { table(:vulnerability_scanners) }
  let(:vulnerabilities) { table(:vulnerabilities) }
  let(:vulnerability_reads) { table(:vulnerability_reads) }

  let(:namespace) { namespaces.create!(name: 'user', path: 'user') }
  let(:project) { projects.create!(namespace_id: namespace.id, project_namespace_id: namespace.id) }
  let(:user) { users.create!(username: 'john_doe', email: 'johndoe@gitlab.com', projects_limit: 10) }
  let(:scanner) { scanners.create!(project_id: project.id, external_id: 'external_id', name: 'Test Scanner') }

  let(:vulnerability_1) { create_vulnerability(title: 'vulnerability 1') }
  let(:vulnerability_2) { create_vulnerability(title: 'vulnerability 2') }

  let!(:vulnerability_read_1) { create_vulnerability_read(vulnerability_id: vulnerability_1.id) }
  let!(:vulnerability_read_2) { create_vulnerability_read(vulnerability_id: vulnerability_2.id) }

  let(:vulnerability_findings) { table(:vulnerability_occurrences) }
  let(:vulnerability_findings_remediations) { table(:vulnerability_findings_remediations) }
  let(:vulnerability_remediations) { table(:vulnerability_remediations) }
  let(:vulnerability_identifiers) { table(:vulnerability_identifiers) }

  subject(:perform_migration) do
    described_class.new(
      start_id: vulnerability_reads.first.vulnerability_id,
      end_id: vulnerability_reads.last.vulnerability_id,
      batch_table: :vulnerability_reads,
      batch_column: :vulnerability_id,
      sub_batch_size: vulnerability_reads.count,
      pause_ms: 0,
      connection: ActiveRecord::Base.connection
    ).perform
  end

  it 'updates vulnerability_reads records which has remediations' do
    vuln_remediation = create_remediation
    vuln_finding = create_finding(vulnerability_id: vulnerability_1.id)
    vulnerability_findings_remediations.create!(
      vulnerability_occurrence_id: vuln_finding.id,
      vulnerability_remediation_id: vuln_remediation.id
    )

    expect { perform_migration }.to change { vulnerability_read_1.reload.has_remediations }.from(false).to(true)
                                .and not_change { vulnerability_read_2.reload.has_remediations }.from(false)
  end

  it 'does not modify has_remediations of vulnerabilities which do not have remediations' do
    expect { perform_migration }.to not_change { vulnerability_read_1.reload.has_remediations }.from(false)
                                .and not_change { vulnerability_read_2.reload.has_remediations }.from(false)
  end

  private

  def create_vulnerability(overrides = {})
    attrs = {
      project_id: project.id,
      author_id: user.id,
      title: 'test',
      severity: 1,
      confidence: 1,
      report_type: 1
    }.merge(overrides)

    vulnerabilities.create!(attrs)
  end

  def create_vulnerability_read(overrides = {})
    attrs = {
      project_id: project.id,
      vulnerability_id: 1,
      scanner_id: scanner.id,
      severity: 1,
      report_type: 1,
      state: 1,
      uuid: SecureRandom.uuid
    }.merge(overrides)

    vulnerability_reads.create!(attrs)
  end

  def create_finding(overrides = {})
    attrs = {
      project_id: project.id,
      scanner_id: scanner.id,
      severity: 5, # medium
      confidence: 2, # unknown,
      report_type: 99, # generic
      primary_identifier_id: create_identifier.id,
      project_fingerprint: SecureRandom.hex(20),
      location_fingerprint: SecureRandom.hex(20),
      uuid: SecureRandom.uuid,
      name: "CVE-2018-1234",
      raw_metadata: "{}",
      metadata_version: "test:1.0"
    }.merge(overrides)

    vulnerability_findings.create!(attrs)
  end

  def create_remediation(overrides = {})
    remediation_hash = { summary: 'summary', diff: "ZGlmZiAtLWdp" }

    attrs = {
      project_id: project.id,
      summary: remediation_hash[:summary],
      checksum: checksum(remediation_hash[:diff]),
      file: Tempfile.new.path
    }.merge(overrides)

    vulnerability_remediations.create!(attrs)
  end

  def create_identifier(overrides = {})
    attrs = {
      project_id: project.id,
      external_id: "CVE-2018-1234",
      external_type: "CVE",
      name: "CVE-2018-1234",
      fingerprint: SecureRandom.hex(20)
    }.merge(overrides)

    vulnerability_identifiers.create!(attrs)
  end

  def checksum(value)
    sha = Digest::SHA256.hexdigest(value)
    Gitlab::Database::ShaAttribute.new.serialize(sha)
  end
end