# frozen_string_literal: true

# Copied and modified from
# https://github.com/jonallured/danger-commit_lint
# which is licensed under the MIT License

require File.expand_path('../spec_helper', __dir__)

TEST_MESSAGES = {
  subject_cap: 'this subject needs a capital',
  subject_words: 'Fixed',
  subject_length: 'This is a really long subject line and should result in an'\
    ' error',
  subject_period: 'This subject line ends in a period.',
  empty_line: "This subject line is fine\nBut then I forgot the empty line '\
    'separating the subject and the body.",
  all_errors: "this is a really long subject and it even ends in a period.\n'\
    'Not to mention the missing empty line!",
  valid: "This is a valid message\n\nYou can tell because it meets all the '\
    'criteria and the linter does not complain."
}.freeze

NOOP_MESSAGE = Danger::DangerWCC::CommitLint::NOOP_MESSAGE
SUBJECT_LENGTH_CHECK_MESSAGE = 'Please limit commit subject line to 50 '\
  'characters.'

def report_counts(status_report)
  status_report.values.flatten.count
end

module Danger
  describe Danger::DangerWCC do
    before do
      @dangerfile = testing_dangerfile
      @my_plugin = @dangerfile.wcc
      @git = @dangerfile.git
    end

    def message_with_sha(message)
      [message, sha].join "\n"
    end

    def commit_lint(options = {})
      Danger::DangerWCC::CommitLint.new(@my_plugin, options).perform
    end

    describe 'commit lint' do
      describe 'check without configuration' do
        let(:sha) { '1234567' }
        let(:commit) { double(:commit, message: message, sha: sha) }

        context 'with invalid messages' do
          it 'fails those checks' do
            checks = {
              subject_cap: SubjectCapCheck::MESSAGE,
              subject_words: SubjectWordsCheck::MESSAGE,
              subject_length: SUBJECT_LENGTH_CHECK_MESSAGE,
              subject_period: SubjectPeriodCheck::MESSAGE,
              empty_line: EmptyLineCheck::MESSAGE
            }

            checks.each do |check, warning|
              commit = double(:commit, message: TEST_MESSAGES[check], sha: sha)
              allow(@git).to receive(:commits).and_return([commit])

              expect {
                commit_lint
              }.to change { @my_plugin.status_report[:errors].count }.by(1)

              status_report = @my_plugin.status_report
              expect(status_report[:errors].last)
                .to eq(message_with_sha(warning))
            end
          end
        end

        context 'with all errors' do
          let(:message) { TEST_MESSAGES[:all_errors] }

          it 'fails every check' do
            allow(@git).to receive(:commits).and_return([commit])

            commit_lint

            status_report = @my_plugin.status_report
            expect(report_counts(status_report)).to eq 4
            expect(status_report[:errors]).to eq [
              message_with_sha(SubjectCapCheck::MESSAGE),
              message_with_sha(SUBJECT_LENGTH_CHECK_MESSAGE),
              message_with_sha(SubjectPeriodCheck::MESSAGE),
              message_with_sha(EmptyLineCheck::MESSAGE)
            ]
          end
        end

        context 'with valid messages' do
          let(:message) { TEST_MESSAGES[:valid] }

          it 'does nothing' do
            checks = {
              subject_length: SUBJECT_LENGTH_CHECK_MESSAGE,
              subject_period: SubjectPeriodCheck::MESSAGE,
              empty_line: EmptyLineCheck::MESSAGE
            }

            checks.each do
              allow(@git).to receive(:commits).and_return([commit])

              commit_lint

              status_report = @my_plugin.status_report
              expect(report_counts(status_report)).to eq 0
            end
          end
        end
      end

      describe 'disable configuration' do
        let(:sha) { '1234567' }
        let(:commit) { double(:commit, message: message, sha: sha) }

        context 'with individual checks' do
          context 'with invalid messages' do
            it 'does nothing' do
              checks = {
                subject_length: SUBJECT_LENGTH_CHECK_MESSAGE,
                subject_period: SubjectPeriodCheck::MESSAGE,
                empty_line: EmptyLineCheck::MESSAGE
              }

              checks.each do |check, _|
                commit = double(:commit,
                                message: TEST_MESSAGES[check], sha: sha)
                allow(@git).to receive(:commits).and_return([commit])

                commit_lint disable: [check]

                status_report = @my_plugin.status_report
                expect(report_counts(status_report)).to eq 0
              end
            end
          end
        end

        context 'with all checks, implicitly' do
          let(:message) { TEST_MESSAGES[:all_errors] }

          it 'warns that nothing was checked' do
            allow(@git).to receive(:commits).and_return([commit])

            all_checks = %i[
              subject_cap
              subject_words
              subject_length
              subject_period
              empty_line
            ]
            commit_lint disable: all_checks

            status_report = @my_plugin.status_report
            expect(report_counts(status_report)).to eq 1
            expect(status_report[:warnings]).to eq [NOOP_MESSAGE]
          end
        end

        context 'with all checks, explicitly' do
          let(:message) { TEST_MESSAGES[:all_errors] }

          it 'warns that nothing was checked' do
            allow(@git).to receive(:commits).and_return([commit])

            commit_lint disable: :all

            status_report = @my_plugin.status_report
            expect(report_counts(status_report)).to eq 1
            expect(status_report[:warnings]).to eq [NOOP_MESSAGE]
          end
        end
      end

      describe 'warn configuration' do
        let(:sha) { '1234567' }
        let(:commit) { double(:commit, message: message, sha: sha) }

        context 'with individual checks' do
          context 'with invalid messages' do
            it 'warns instead of failing' do
              checks = {
                subject_length: SUBJECT_LENGTH_CHECK_MESSAGE,
                subject_period: SubjectPeriodCheck::MESSAGE,
                empty_line: EmptyLineCheck::MESSAGE
              }

              checks.each do |check, warning|
                commit = double(:commit,
                                message: TEST_MESSAGES[check], sha: sha)
                allow(@git).to receive(:commits).and_return([commit])

                expect {
                  commit_lint warn: [check]
                }.to change { @my_plugin.status_report[:warnings].count }.by(1)

                status_report = @my_plugin.status_report
                expect(status_report[:warnings].last)
                  .to eq(message_with_sha(warning))
              end
            end
          end

          context 'with valid messages' do
            let(:message) { TEST_MESSAGES[:valid] }

            it 'does nothing' do
              checks = {
                subject_length: SUBJECT_LENGTH_CHECK_MESSAGE,
                subject_period: SubjectPeriodCheck::MESSAGE,
                empty_line: EmptyLineCheck::MESSAGE
              }

              checks.each do |check, _|
                allow(@git).to receive(:commits).and_return([commit])

                commit_lint warn: [check]

                status_report = @my_plugin.status_report
                expect(report_counts(status_report)).to eq 0
              end
            end
          end
        end

        context 'with all checks' do
          context 'with all errors' do
            let(:message) { TEST_MESSAGES[:all_errors] }

            it 'warns instead of failing' do
              allow(@git).to receive(:commits).and_return([commit])

              commit_lint warn: :all

              status_report = @my_plugin.status_report
              expect(report_counts(status_report)).to eq 4
              expect(status_report[:warnings]).to eq [
                message_with_sha(SubjectCapCheck::MESSAGE),
                message_with_sha(SUBJECT_LENGTH_CHECK_MESSAGE),
                message_with_sha(SubjectPeriodCheck::MESSAGE),
                message_with_sha(EmptyLineCheck::MESSAGE)
              ]
            end
          end

          context 'with a valid message' do
            let(:message) { TEST_MESSAGES[:valid] }

            it 'does nothing' do
              allow(@git).to receive(:commits).and_return([commit])

              commit_lint warn: :all

              status_report = @my_plugin.status_report
              expect(report_counts(status_report)).to eq 0
            end
          end
        end
      end

      describe 'fail configuration' do
        let(:sha) { '1234567' }
        let(:commit) { double(:commit, message: message, sha: sha) }

        context 'with individual checks' do
          context 'with invalid messages' do
            it 'fails those checks' do
              checks = {
                subject_length: SUBJECT_LENGTH_CHECK_MESSAGE,
                subject_period: SubjectPeriodCheck::MESSAGE,
                empty_line: EmptyLineCheck::MESSAGE
              }

              checks.each do |check, warning|
                commit = double(:commit,
                                message: TEST_MESSAGES[check], sha: sha)
                allow(@git).to receive(:commits).and_return([commit])

                expect {
                  commit_lint fail: [check]
                }.to change { @my_plugin.status_report[:errors].count }.by(1)

                status_report = @my_plugin.status_report

                expect(status_report[:errors].last)
                  .to eq(message_with_sha(warning))
              end
            end
          end

          context 'with valid messages' do
            let(:message) { TEST_MESSAGES[:valid] }

            it 'does nothing' do
              checks = {
                subject_length: SUBJECT_LENGTH_CHECK_MESSAGE,
                subject_period: SubjectPeriodCheck::MESSAGE,
                empty_line: EmptyLineCheck::MESSAGE
              }

              checks.each do |check, _|
                allow(@git).to receive(:commits).and_return([commit])

                commit_lint fail: [check]

                status_report = @my_plugin.status_report
                expect(report_counts(status_report)).to eq 0
              end
            end
          end
        end

        context 'with all checks' do
          context 'with all errors' do
            let(:message) { TEST_MESSAGES[:all_errors] }

            it 'fails those checks' do
              allow(@git).to receive(:commits).and_return([commit])

              commit_lint fail: :all

              status_report = @my_plugin.status_report
              expect(report_counts(status_report)).to eq 4
              expect(status_report[:errors]).to eq [
                message_with_sha(SubjectCapCheck::MESSAGE),
                message_with_sha(SUBJECT_LENGTH_CHECK_MESSAGE),
                message_with_sha(SubjectPeriodCheck::MESSAGE),
                message_with_sha(EmptyLineCheck::MESSAGE)
              ]
            end
          end

          context 'with a valid message' do
            let(:message) { TEST_MESSAGES[:valid] }

            it 'does nothing' do
              allow(@git).to receive(:commits).and_return([commit])

              commit_lint fail: :all

              status_report = @my_plugin.status_report
              expect(report_counts(status_report)).to eq 0
            end
          end
        end
      end

      describe 'individual check options' do
        let(:sha) { '1234567' }

        context 'with invalid messages for given options' do
          it 'fails those checks' do
            options = [
              [:subject_length, { max: 10 }],
              [:subject_length, { min: 100, max: 110 }]
            ]
            messages = [
              'Please limit commit subject line to 10 characters.',
              'Please write a commit subject line of at least 100 characters.'
            ]

            options.each_with_index do |(check, opts), i|
              commit = double(:commit,
                              message: TEST_MESSAGES[:valid], sha: sha)
              allow(@git).to receive(:commits).and_return([commit])

              arg = {}
              arg[check] = opts
              expect {
                commit_lint arg
              }.to change { @my_plugin.status_report[:errors].count }.by(1)

              status_report = @my_plugin.status_report
              expect(status_report[:errors].last)
                .to eq(message_with_sha(messages[i]))
            end
          end
        end
      end
    end
  end
end