# coding: utf-8
require 'CSV'
require 'yaml'

YAML_BASE = {"author": "Christoffer Müller Madsen", "city": "Aarhus", "from": ["Falstersgade 18, 4. th", "8000 Aarhus C"], 'currency': 'DKK', 'commasep': true, 'lang': 'danish', 'seriffont': 'Hoefler Text', 'sansfont': 'Helvetica Neue', 'fontsize': '10pt', 'geometry': 'a4paper, left=43mm, right=43mm, top=51mm, bottom=17mm', 'closingnote': %Q[Overfør venligst det anførte beløb via MobilePay til følgende telefonnummer i løbet af de næste 14 dage:

    +45 81 73 02 02

På forhånd tak.

Med venlig hilsen
] }

PATH_BASE = "./pdf/"
PRETTY_PRODUCTS = {"papkaffe" => "Papkrus kaffe (0.35 L)", "kage" => "Kage", "spandaur" => "Spandaur", "kaffekrus" => "Kaffe i krus (0.25 L)"}
PRETTY_NAMES = {"Alexander" => "Alexander Munch-Hansen", "Jon" => "Jon Michael Aanes"}
PRICES = {'papkaffe' => 7, "kage" => 11, "kaffekrus" => 5}
lines = {}

class LogItem
  def initialize(time,person,product,amount: 1)
    @time = time
    @person = person
    @product = product
    @amount = amount
  end
  attr_accessor :time, :person, :product, :amount
end

def read_file(file)
  rows = Array.new
  CSV.foreach(file, col_sep: ';', converters: :float) do |row|
    rows << LogItem.new(row[0],row[1],row[2],amount: row[3])
  end
  rows
end

def partition_rows(rows)
  skyldnere = Hash.new
  rows.each do |row|
    skyldnere[row.person] = Hash.new unless skyldnere[row.person]
    skyldnere[row.person][row.product] = 0 unless skyldnere[row.person][row.product]
    skyldnere[row.person][row.product] += row.amount
  end
  skyldnere
end

def generate_receipt(skyldnere)
  counter = 0
  skyldnere.each do |person, products|
    counter += 1
    yaml = YAML_BASE.clone
    yaml["to"] = PRETTY_NAMES[person]
    products.each do |product, amount|
      yaml["invoice-nr"] = Time.now.strftime('%Y%W') + "-" + counter.to_s
      yaml["service"] = Array.new unless yaml["service"]
      hash = {description: PRETTY_PRODUCTS[product], price: PRICES[product]*amount, amount: amount}
      yaml["service"] << Hash[hash.map{ |k, v| [k.to_s, v] }]
    end
    output = Hash[yaml.map{ |k, v| [k.to_s, v] }].to_yaml
    output += "---\n"
    file = File.open("./pandoc/details.yml","w")
    file << output
    file.close
    `cd pandoc/; make -B`
    `cp pandoc/output.pdf pdf/#{yaml["invoice-nr"]}.pdf`
    puts "#{person}: #{yaml["invoice-nr"]}.pdf"
  end
end

partition = partition_rows(read_file("./log/matkant-#{Time.now.strftime('%Y%W')}.log"))
generate_receipt(partition)