# frozen_string_literal: true

module Ci
  class PipelinePresenter < Gitlab::View::Presenter::Delegated
    include Gitlab::Utils::StrongMemoize
    include ActionView::Helpers::UrlHelper

    # We use a class method here instead of a constant, allowing EE to redefine
    # the returned `Hash` more easily.
    def self.failure_reasons
      { unknown_failure: 'Unknown pipeline failure!',
        config_error: 'CI/CD YAML configuration error!',
        external_validation_failure: 'External pipeline validation failed!' }
    end

    presents :pipeline

    def failed_builds
      return [] unless can?(current_user, :read_build, pipeline)

      strong_memoize(:failed_builds) do
        pipeline.builds.latest.failed
      end
    end

    def failure_reason
      return unless pipeline.failure_reason?

      self.class.failure_reasons[pipeline.failure_reason.to_sym] ||
        pipeline.failure_reason
    end

    def status_title
      if auto_canceled?
        "Pipeline is redundant and is auto-canceled by Pipeline ##{auto_canceled_by_id}"
      end
    end

    NAMES = {
      merge_train: s_('Pipeline|Merge train pipeline'),
      merged_result: s_('Pipeline|Merged result pipeline'),
      detached: s_('Pipeline|Detached merge request pipeline')
    }.freeze

    def name
      # Currently, `merge_request_event_type` is the only source to name pipelines
      # but this could be extended with the other types in the future.
      NAMES.fetch(pipeline.merge_request_event_type, s_('Pipeline|Pipeline'))
    end

    def ref_text
      if pipeline.detached_merge_request_pipeline?
        _("for %{link_to_merge_request} with %{link_to_merge_request_source_branch}")
          .html_safe % {
            link_to_merge_request: link_to_merge_request,
            link_to_merge_request_source_branch: link_to_merge_request_source_branch
          }
      elsif pipeline.merge_request_pipeline?
        _("for %{link_to_merge_request} with %{link_to_merge_request_source_branch} into %{link_to_merge_request_target_branch}")
          .html_safe % {
            link_to_merge_request: link_to_merge_request,
            link_to_merge_request_source_branch: link_to_merge_request_source_branch,
            link_to_merge_request_target_branch: link_to_merge_request_target_branch
          }
      elsif pipeline.ref && pipeline.ref_exists?
        _("for %{link_to_pipeline_ref}")
        .html_safe % { link_to_pipeline_ref: link_to_pipeline_ref }
      elsif pipeline.ref
        _("for %{ref}").html_safe % { ref: plain_ref_name }
      end
    end

    def all_related_merge_request_text(limit: nil)
      if all_related_merge_requests.none?
        _("No related merge requests found.")
      else
        _("%{count} related %{pluralized_subject}: %{links}" % {
          count: all_related_merge_requests.count,
          pluralized_subject: n_('merge request', 'merge requests', all_related_merge_requests.count),
          links: all_related_merge_request_links(limit: limit).join(', ')
        }).html_safe
      end
    end

    def has_many_merge_requests?
      all_related_merge_requests.count > 1
    end

    def link_to_pipeline_ref
      link_to(pipeline.ref,
        project_commits_path(pipeline.project, pipeline.ref),
        class: "ref-name")
    end

    def link_to_merge_request
      return unless merge_request_presenter

      link_to(merge_request_presenter.to_reference,
        project_merge_request_path(merge_request_presenter.project, merge_request_presenter),
        class: 'mr-iid')
    end

    def link_to_merge_request_source_branch
      merge_request_presenter&.source_branch_link
    end

    def link_to_merge_request_target_branch
      merge_request_presenter&.target_branch_link
    end

    private

    def plain_ref_name
      content_tag(:span, pipeline.ref, class: 'ref-name')
    end

    def merge_request_presenter
      strong_memoize(:merge_request_presenter) do
        if pipeline.merge_request?
          pipeline.merge_request.present(current_user: current_user)
        end
      end
    end

    def all_related_merge_request_links(limit: nil)
      limit ||= all_related_merge_requests.count

      all_related_merge_requests.first(limit).map do |merge_request|
        mr_path = project_merge_request_path(merge_request.project, merge_request)

        link_to "#{merge_request.to_reference} #{merge_request.title}", mr_path, class: 'mr-iid'
      end
    end

    def all_related_merge_requests
      strong_memoize(:all_related_merge_requests) do
        if pipeline.ref && can?(current_user, :read_merge_request, pipeline.project)
          pipeline.all_merge_requests_by_recency.to_a
        else
          []
        end
      end
    end
  end
end

Ci::PipelinePresenter.prepend_if_ee('EE::Ci::PipelinePresenter')