# encoding: utf-8

require 'rss'
require 'mongo'

SITES = { "總務處-各單位公告" => "0",
          "總務處-文書組" => "1",
          "總務處-出納組" => "2",
          "總務處-事務組" => "3",
          "總務處-保管組" => "5",
          "總務處-採購組" => "6",
          "總務處-經營管理組" => "7",
          "總務處-駐衛警察隊" => "9",
          "總務處-營繕組" => "10",
          "總務處-總務處" => "11",
          "社會科學院-社會科學院總務分處" => "4",
          "醫學院-醫學院總務分處" => "8" }

SITE_KEYS = SITES.keys

DB_BASE_NAME = "production"

all = {}
continue = true
i = 1
while continue do
  open("http://ann.cc.ntu.edu.tw/asp/rss.asp?page=#{i}") do |rss|
    feed = RSS::Parser.parse(rss.read.encode('utf-8', 'big5', invalid: :replace, undef: :replace, replace: '').gsub('<pubDate>Wes,', '<pubDate>Wed,').gsub(/(encoding=\"big5\")/, 'encoding="utf-8"'))
    feed.items.size
    feed.items.each do |item|
      if SITE_KEYS.include?(item.author)
        author = item.author.strip
        category = item.category.to_s.gsub(/\<(\/)*category\>/, '')
        if all[author]
          all[author][item.link.strip] = {title: item.title.strip, author: author, link: item.link.strip, date: item.pubDate, category: category, description: item.description.gsub("\r\n", '<br/>').strip}
        else
          all[author] = {item.link.strip => {title: item.title.strip, author: author, link: item.link.strip, date: item.pubDate, category: category, description: item.description.gsub("\r\n", '<br/>').strip}}
        end
      end
    end
    continue = false if feed.items.size < 100
  end
  i += 1
end

# Get corresponding category_id or create a new one
def get_category_id(category, categories, coll_cat)
  if categories.keys.include? "rss_#{category}"
    [categories["rss_#{category}"], categories]
  else
    cat = {
      _type: "BulletinCategory",
      key: "rss_#{category}",
      disable: false,
      title: {:zh_tw => category},
      created_at: Time.now,
      updated_at: Time.now
    }
    categories["rss_#{category}"] = result = coll_cat.save(cat)
    [result, categories]
  end
end

# Get categories and id based on a given site number
def get_mongo_and_categories(site_number="0")
  db = Mongo::Connection.new("localhost", 27017).db("#{DB_BASE_NAME}_#{site_number}")
  coll_bulletin = db["bulletins"]
  coll_cat =  db["bulletin_categories"]

  categories = coll_cat.find().to_a.inject({}) do |categories, category|
    categories[category['key']] = category['_id']
    categories
  end
  [categories, coll_bulletin, coll_cat]
end

# Get main site (總務處) categories
@main_categories, @main_coll_bulletin, @main_coll_cat = get_mongo_and_categories

all.each do |key, value| # Loop through all the authors
  site_number = SITES[key]
  categories, coll_bulletin, coll_cat = get_mongo_and_categories(site_number) # Get current's site categories
  value.each_value do |bul| # Loop through all the items
    category_id, categories = get_category_id(bul[:category], categories, coll_cat)
    unless coll_bulletin.find_one(rss_link: bul[:link]) 
      bulletin = {  _type: "Bulletin",
                    postdate: bul[:date],
                    created_at: bul[:date],
                    updated_at: bul[:date],
                    is_checked: true,
                    is_pending: false,
                    is_rejected: false,
                    bulletin_category_id: category_id,
                    title: {:zh_tw => bul[:title]},
                    text: {:zh_tw => bul[:description]},
                    available_for_zh_tw: true,
                    rss_link: bul[:link],
                    is_top: false,
                    is_hot: false,
                    is_hidden: false }
      coll_bulletin.save(bulletin) 
      unless site_number.eql? "0" # Copy the item to the main site
        category_id, @main_categories = get_category_id(bul[:category], @main_categories, @main_coll_cat)
        main_bulletin = bulletin.clone
        main_bulletin['_id'] = BSON::ObjectId.new
        main_bulletin[:bulletin_category_id] = category_id
        @main_coll_bulletin.save(main_bulletin)
      end
    end
  end
end