# Quickly hacked together my Michael Ivey
# Based on mt.rb by Nick Gerakines, open source and publically
# available under the MIT license. Use this module at your own risk.

require 'rubygems'
require 'sequel'
require 'fastercsv'
require 'fileutils'
require File.join(File.dirname(__FILE__),"csv.rb")

# NOTE: This converter requires Sequel and the MySQL gems.
# The MySQL gem can be difficult to install on OS X. Once you have MySQL
# installed, running the following commands should work:
# $ sudo gem install sequel
# $ sudo gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config

module Jekyll
  module Mephisto
    #Accepts a hash with database config variables, exports mephisto posts into a csv
    #export PGPASSWORD if you must
    def self.postgres(c)
      sql = <<-SQL
      BEGIN;
      CREATE TEMP TABLE jekyll AS
        SELECT title, permalink, body, published_at, filter FROM contents
        WHERE user_id = 1 AND type = 'Article' ORDER BY published_at;
      COPY jekyll TO STDOUT WITH CSV HEADER;
      ROLLBACK;
      SQL
      command = %Q(psql -h #{c[:host] || "localhost"} -c "#{sql.strip}" #{c[:database]} #{c[:username]} -o #{c[:filename] || "posts.csv"})
      puts command
      `#{command}`
      CSV.process
    end

    # This query will pull blog posts from all entries across all blogs. If
    # you've got unpublished, deleted or otherwise hidden posts please sift
    # through the created posts to make sure nothing is accidently published.

    # QUERY = "SELECT id, permalink, body, published_at, title FROM contents WHERE user_id = 1 AND type = 'Article' AND published_at IS NOT NULL ORDER BY published_at"

    QUERY = "SELECT contents.id, contents.permalink, contents.body, contents.published_at, contents.title, GROUP_CONCAT(tags.name) AS tags FROM taggings JOIN (contents,tags) ON (tag_id=tags.id AND taggable_id=contents.id) WHERE contents.user_id = 1 AND contents.type = 'Article' AND contents.published_at IS NOT NULL GROUP BY contents.permalink"


    def self.process(dbname, user, pass, host = 'localhost')
      db = Sequel.mysql(dbname, :user => user, :password => pass, :host => host)

      FileUtils.mkdir_p "_posts"

      db[QUERY].each do |post|
        title = post[:title]
        slug = post[:permalink]
        date = post[:published_at]
        content = post[:body]
#         more_content = ''

        # Be sure to include the body and extended body.
#         if more_content != nil
#           content = content + " \n" + more_content
#         end

        # Ideally, this script would determine the post format (markdown, html
        # , etc) and create files with proper extensions. At this point it
        # just assumes that markdown will be acceptable.
        name = [date.year, date.month, date.day, slug].join('-') + ".markdown"

        data = {
           'layout' => 'post',
           'title' => title.to_s,
           'mt_id' => post[:entry_id],
           'categories' => post[:tags].to_s.split(','),
         }.delete_if { |k,v| v.nil? || v == ''}.to_yaml

        File.open("_posts/#{name}", "w") do |f|
          f.puts data
          f.puts "---"
          f.puts content
        end
      end

    end
  end
end