require 'slack-notifier'

module Ci
  class SlackMessage
    def initialize(commit)
      @commit = commit
    end

    def pretext
      ''
    end

    def color
      attachment_color
    end

    def fallback
      format(attachment_message)
    end

    def attachments
      fields = []

      if commit.matrix?
        commit.builds_without_retry.each do |build|
          next if build.allow_failure?
          next unless build.failed?
          fields << {
            title: build.name,
            value: "Build <#{Ci::RoutesHelper.ci_project_build_url(project, build)}|\##{build.id}> failed in #{build.duration.to_i} second(s)."
          }
        end
      end

      [{
         text: attachment_message,
         color: attachment_color,
         fields: fields
       }]
    end

    private

    attr_reader :commit

    def attachment_message
      out = "<#{Ci::RoutesHelper.ci_project_url(project)}|#{project_name}>: "
      if commit.matrix?
        out << "Commit <#{Ci::RoutesHelper.ci_project_ref_commits_url(project, commit.ref, commit.sha)}|\##{commit.id}> "
      else
        build = commit.builds_without_retry.first
        out << "Build <#{Ci::RoutesHelper.ci_project_build_path(project, build)}|\##{build.id}> "
      end
      out << "(<#{commit_sha_link}|#{commit.short_sha}>) "
      out << "of <#{commit_ref_link}|#{commit.ref}> "
      out << "by #{commit.git_author_name} " if commit.git_author_name
      out << "#{commit_status} in "
      out << "#{commit.duration} second(s)"
    end

    def format(string)
      Slack::Notifier::LinkFormatter.format(string)
    end

    def project
      commit.project
    end

    def project_name
      project.name
    end

    def commit_sha_link
      "#{project.gitlab_url}/commit/#{commit.sha}"
    end

    def commit_ref_link
      "#{project.gitlab_url}/commits/#{commit.ref}"
    end

    def attachment_color
      if commit.success?
        'good'
      else
        'danger'
      end
    end

    def commit_status
      if commit.success?
        'succeeded'
      else
        'failed'
      end
    end
  end
end