module Dri
  class Report
    attr_reader :header, :failures, :labels

    def initialize(config)
      @labels = ['Title', 'Issue', 'Pipelines', 'Stack Trace', 'Actions']
      @failures = []
      @date = Date.today
      @today = Date.today.strftime("%Y-%m-%d") 
      @weekday = Date.today.strftime("%A")
      @header = nil

      @api_client = ApiClient.new(config)
    end

    def set_header(timezone, username)
      @header = "# #{timezone}, #{@weekday} - #{@date}\n posted by: @#{username}"
    end

    def add_failure(failure)
      iid = failure["iid"]
      title = failure["title"]
      link = failure["web_url"]
      labels = failure["labels"]
      created_at = failure["created_at"]
      assignees = failure["assignees"]
      award_emoji_url = failure["_links"]["award_emoji"]
      description = failure["description"]

      related_mrs = @api_client.fetch_related_mrs(issue_iid: iid)
      emoji = classify_failure_emoji(created_at)
      emojified_link = "#{emoji} #{link}"
   
      stack_blob = description.empty? ? "No stack trace found" : description.split("### Stack trace").last.gsub(/\n|`|!|\[|\]/, '').squeeze(" ")[0...250]
      stack_trace = ":link:[`#{stack_blob}...`](#{link + '#stack-trace'})"

      failure_type = filter_failure_type_labels(labels)
      assigned_status = assigned?(assignees)
      pipelines = filter_pipeline_labels(labels)

      linked_pipelines = link_pipelines(iid, pipelines)

      actions = ""
      actions.concat actions_status_template(failure_type, assigned_status)
      actions.concat actions_fixes_template(related_mrs)

      @failures << [title, emojified_link, linked_pipelines, stack_trace, actions]
    end

    private

    def link_pipelines(iid, pipelines)
      failure_notes = @api_client.fetch_failure_notes(issue_iid: iid)

      linked = ""
              
      pipelines.each do |pipeline|
          failure_notes.each do |note|
            if note["body"].include? pipeline
              pipeline_link = URI.extract(note["body"], %w(https))
              pipeline_link_sanitized = pipeline_link.join.strip
              pipeline = "[#{pipeline}](#{pipeline_link_sanitized})"
              break
            end
          end

          linked << pipeline
      end
      linked
    end

    def actions_status_template(failure_type, assigned_status)
      "<i>Status:</i><ul><li>#{failure_type}</li><li>#{assigned_status}</li><li>[ ] notified SET</li><li>[ ] quarantined</li></ul>"
    end

    def actions_fixes_template(related_mrs)
      actions_fixes_template = '<ul><i>Potential fixes:</i><br>'
      related_mrs.each do |mr|
        actions_fixes_template.concat "<li>[#{mr["title"]}](#{mr["web_url"]})</li>"
      end
      actions_fixes_template.concat '</ul>'
      actions_fixes_template
    end

    def assigned?(assignees)
      assignees.empty? ?  'Assigned :x:' : 'Assigned :white_check_mark:'
    end

    def filter_pipeline_labels(labels)
      pipelines = []

      labels.each do |label|
        matchers = { 'found:' => ' ', '.gitlab.com' => ' ' }
  
        if label.include? "found:"
          pipeline = label.gsub(/found:|.gitlab.com/) { |match| matchers[match] }
          pipelines << pipeline.strip
        end
      end
      pipelines
    end

    def filter_failure_type_labels(labels)
      labels.each do |label|
        @type = label.gsub!('failure::', ' ').to_s if label.include? "failure::"
      end
      @type
    end

    def classify_failure_emoji(created_at)
      new_failure_emoji = ':boom:'
      known_failure_emoji = ':fire_engine:'

      if created_at.include? @today
        new_failure_emoji
      else
       known_failure_emoji
      end
    end
  end
end