#!/usr/bin/env ruby
# coding: utf-8

require 'open-uri'
require 'nokogiri'
require 'erb'
require 'time'

def fmt_time t
  t.strftime "%Y%m%dT%H%M%S"
end

class Event
  attr_accessor :title, :url
  attr_reader :dtstart, :dtend

  def initialize
    @location = "Hygienemuseum"
  end

  def date=(t)
    @dtstart = t
    @dtend = @dtstart + 3600
  end
end

events = []
url = "http://kosmotique.org/feed.xml"
doc = Nokogiri::HTML URI.open(url)
doc.css("entry").each do |entry|
  begin
    ev = Event::new
    ev.title = entry.css("title").text
    ev.url = entry.css("link").attr "href"
    ev.date = Time.parse entry.css("published").text
    events << ev
  rescue
    STDERR.puts "Omitting: #{$!}"
    STDERR.puts $!.backtrace
  end
end

ical = ERB::new <<~EOF
  BEGIN:VCALENDAR
  VERSION:2.0
  METHOD:PUBLISH
  X-WR-TIMEZONE;VALUE=TEXT:Europe/Berlin
  <% events.each do |ev| %>
  BEGIN:VEVENT
  SUMMARY:<%= ev.title %>
  DTSTART:<%= fmt_time ev.dtstart %>
  DTEND:<%= fmt_time ev.dtend %>
  UID:<%= ev.url %>
  URL:<%= ev.url %>
  LOCATION:Kosmotique, Martin-Luther-Str. 13, Dresden
  END:VEVENT
  <% end %>
  END:VCALENDAR
EOF

puts ical.result