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

require 'open-uri'
require 'csv'
require 'time'
require 'erb'

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

class Event
  attr_accessor :title, :link
  attr_reader :dtstart, :dtend, :location

  def location=(s)
    @location = "#{s}, theater junge generation"
  end
  
  def date=(s)
    @dtstart = Time::parse s
    @dtend = @dtstart + 7200
  end
end

events = []

url = "https://www.tjg-dresden.de/eventexport/csv.html"
body = URI.open(url).read.force_encoding 'UTF-8'
events = CSV::parse(body, headers: true, col_sep: ";").collect do |row|
  ev = Event::new
  row.each do |k, v|
    case k
    when /Titel/
      ev.title = v
    when /Ort/
      ev.location = v
    when /Link/
      ev.link = v
    when /Datum/
      ev.date = v
    end
  end
  ev
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.link %>
  URL:<%= ev.link %>
  LOCATION:<%= ev.location %>
  END:VEVENT
  <% end %>

  END:VCALENDAR
EOF

puts ical.result