#!/usr/bin/env ruby

begin
  require 'elegant'
rescue LoadError
  require 'rubygems'
  require 'elegant'
end

class Section
  attr_accessor :title, :page, :alignment
  def initialize(title:, page:, alignment:)
    @title, @page, @alignment = title, page, alignment
  end

  attr_accessor :document
  include Prawn::View
  def render_to(pdf)
    @document = pdf
    render
  end

  def render
    header

    bounding_box [0, cursor], width: bounds.width, height: 170 do
      stroke_bounds
    end

    footer
  end

private

  def header
    if alignment == :top and page > 1
      start_new_page
    end

    move_down 10
    formatted_text_box [{text: title.upcase, font: sans_serif, styles: [:bold], valign: :center, color: '556270', size: 14}], height: 15, at: [0, cursor]
    move_down 30 # 15 of the float box, and 15 real
  end

  def footer
    unless alignment == :bottom
      document.move_down 25
      document.stroke_horizontal_rule
    end
  end

  def sans_serif
    'Sans Serif' if document.font_families['Sans Serif']
  end
end

sections = [
  Section.new(title: 'Lifetime Metrics', page: 1, alignment: :top),
  Section.new(title: 'Monetization', page: 1, alignment: :middle),
  Section.new(title: 'Month over month view tracking', page: 1, alignment: :bottom),
  Section.new(title: 'Lifetime Metrics', page: 2, alignment: :top),
  Section.new(title: 'Month over month view tracking', page: 2, alignment: :middle),
]

def font_files_for(family)
  {normal: ttf("#{family}-Regular"), bold: ttf("#{family}-Bold")}
end

def ttf(basename)
  asset "fonts/#{basename}.ttf"
end

def png(basename)
  asset "images/#{basename}.png"
end

def asset(path)
  File.expand_path "../../tmp/#{path}", __FILE__
end

fonts = {}.tap do |families|
  families['Helvetica']    = font_files_for 'HelveticaWorld'
  families['Fallback']     = font_files_for 'ArialUnicode'
  families['Sans Serif']   = font_files_for 'ProximaNova'
end

company_logo = png('logo')
company_name = 'Fullscreen'
title = 'March 2015'
thumbnail = png('thumbnail')
footer = "Report for channelpl.us (2015/02/12 – 2015/10/12)"

filename = 'elegant.pdf'

Elegant::Document.new(fonts: fonts, title: title, company_logo: company_logo, thumbnail: thumbnail, footer: footer, company_name: company_name) do |pdf|
  sections.each{|section| section.render_to pdf}
end.render_file filename

`open #{filename}`