# frozen_string_literal: true

require_relative '../result'

module CircleCIReporter
  module Reporters
    class Link
      # @attr name [String]
      # @attr url [String]
      # @attr base_url [String, nil]
      # @attr previous_url [String, nil]
      LinkReport = Struct.new(:name, :url, :base_url, :previous_url) do
        # @return [String]
        def to_s
          links = []
          links << "[master](#{base_url})" if base_url
          links << "[previous](#{previous_url})" if previous_url
          link = links.empty? ? nil : " (#{links.join(', ')})"
          "[#{name}](#{url})#{link}"
        end
      end

      # @param path [String]
      # @param name [String]
      def initialize(path:, name:)
        @path = path
        @name = name
      end

      # @note Implementation for {Base#active?}
      def active?
        File.file?(File.join(configuration.artifacts_dir, path))
      end

      # @note Override {Base#name}
      attr_reader :name

      # @param base_build [Build, nil]
      # @param previous_build [Build, nil]
      # @return [LinkReport]
      def report(base_build, previous_build)
        LinkReport.new(name, url, extract_artifact_url(base_build), extract_artifact_url(previous_build))
      end

      private

      attr_reader :path

      # @return [String]
      def url
        [
          'https://circle-artifacts.com/gh',
          configuration.project,
          configuration.current_build_number,
          'artifacts',
          "0/#{configuration.artifacts_dir}",
          path
        ].join('/')
      end

      def configuration
        CircleCIReporter.configuration
      end

      # @param build [Build, nil]
      # @return [String, nil]
      def extract_artifact_url(build)
        return unless build

        artifact = build.find_artifact(path)
        artifact ? artifact.url : nil
      end
    end
  end
end