tommy.rb
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	# frozen_string_literal: true

	# -------------------------------------------------------------
	# Tommy - Visualisation dashboard for Jenkins
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	# Author: Arfon Smitn (Zooniverse)
	# Maintainer: Sebastien Santoro aka Dereckson
	# Project: Nasqueron
	# Created: 2011-09-14
	# Dependencies: Sinatra
	# -------------------------------------------------------------

	require 'rest-client'
	require 'active_support/all'
	require 'hashie'
	require 'erb'
	require 'sinatra'

	# -------------------------------------------------------------
	# Table of contents
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	#
	# :: Environment
	# :: Project class
	# :: Controller
	# :: Routes
	# :: Helpers
	#
	# -------------------------------------------------------------

	# -------------------------------------------------------------
	# Environment
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	begin
	JENKINS_URL = ENV.fetch('JENKINS_URL')
	rescue KeyError
	$stderr.write %(You must define JENKINS_URL to your Jenkins instance URL.

	If you need to pass credentials, you can use the syntax https://username:password@jenkins.domain.tld.
	)
	exit 1
	end

	# -------------------------------------------------------------
	# Project class
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	##
	# This class represents a defined or discrete hash for a Jenkins project.
	class Project < Hashie::Dash
	property :name
	property :build_score
	property :last_build_number
	property :last_build_url
	property :last_stable_build
	property :health_report
	property :last_complete_url
	property :last_failed_url
	property :colour

	##
	# Builds a project name from a name and a prefix
	# Returns a string.
	def self.build_name(name, prefix)
	return name if prefix.nil?

	[prefix, name.tr('-', ' ')].join(' / ')
	end

	##
	# Parses a job element of the Jenkins API.
	# Returns a Project instance.
	def self.parse_project(data, prefix = nil)
	name = build_name(data['displayName'], prefix)

	project = Project.new(
	name: name,
	last_build_number: data['builds'].first['number'],
	colour: data['color']
	)

	if data['healthReport']
	project.build_score = data['healthReport'].first['score'].to_i
	project.health_report = data['healthReport'].first['description']
	end

	unless data['lastStableBuild'].blank?
	project.last_stable_build = data['lastStableBuild']['number']
	end

	urls = {
	lastBuild: 'last_build_url=',
	lastCompletedBuild: 'last_complete_url=',
	lastFailedBuild: 'last_failed_url='
	}
	urls.each do \|api_property, local_property\|
	next if data[api_property].blank?

	project.send(local_property, data[api_property]['url'])
	end

	project
	rescue NoMethodError
	nil
	end

	def self.multi_project?(data)
	data['_class'].start_with?('org.jenkinsci.plugins.workflow.multibranch')
	end

	##
	# Parses a JSON API reply into an array of Project instances
	def self.parse_incoming_json(json)
	projects = []

	json['jobs'].each do \|job\|
	parse_projects(job).each do \|project\|
	projects << project unless project.nil?
	end
	end

	projects
	end

	def self.parse_projects(job)
	if multi_project?(job)
	parse_multi_projects(job)
	else
	[parse_project(job)]
	end
	end

	def self.parse_multi_projects(root_job)
	projects = []
	prefix = root_job['name']

	root_job['jobs'].each do \|job\|
	projects << parse_project(job, prefix)
	end

	projects
	end

	##
	# Determines if a build is green
	def green?
	last_stable_build == last_build_number
	end

	##
	# Determines if a build is still building
	def building?
	colour.include?('anime')
	end
	end

	# -------------------------------------------------------------
	# Controller
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	def prepare_dashboard
	json = RestClient::Resource.new("#{JENKINS_URL}/api/json?depth=2")
	@projects = Project.parse_incoming_json(JSON.parse(json.get))

	erb :index
	end

	# -------------------------------------------------------------
	# Routes
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	get '/' do
	prepare_dashboard
	end

	get '/manifest.json' do
	content_type 'application/json'
	erb :manifest
	end

	get '/status' do
	'ALIVE'
	end

	# -------------------------------------------------------------
	# Helpers
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	helpers do
	def css_scores
	{
	100 => 'best',
	80 => 'better',
	60 => 'good',
	40 => 'bad',
	0 => 'worse'
	}
	end

	def css_for_score(score)
	css_scores.each do \|threshold, css_class\|
	return css_class if score >= threshold
	end
	raise 'Specify in scores a value for the lower score you can get.'
	end

	def css_for_project(project)
	if project.green?
	css_for_score(project.build_score)
	elsif project.building?
	'building'
	else
	'worst'
	end
	end
	end

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