require 'rake'
require 'id3lib'

TOTAL_PARTS = "2"
CHAPTERS_IN_PART1 = "52"
CHAPTERS_IN_PART2 = "74"

def fix_tag(filename, part, total_parts, chapter, total_chapters_in_part)
  puts "Fixing ID3 tag of #{filename}..."
  tag = ID3Lib::Tag.new(filename)
  tag.strip!
  tag.title = "Parte #{part} - Capitulo #{chapter}"
  tag.album = "Don Quijote de la Mancha"
  tag.artist = "Miguel de Cervantes"
  tag.disc = "#{part}/#{total_parts}"
  tag.track = "#{chapter}/#{total_chapters_in_part}"
  tag.update!
end


desc "Download all files"
task :download do
  ("01"..CHAPTERS_IN_PART1).each do |chapter|
    `wget http://www.aularagon.org/files/espa/elquijote/p1/Parte%201%20Cap%C3%ADtulo-#{chapter}.mp3`
  end
  ("01"..CHAPTERS_IN_PART2).each do |chapter|
    `wget http://www.aularagon.org/files/espa/elquijote/p2/Parte%202%20Cap%C3%ADtulo-#{chapter}.mp3`
  end
end

desc "Rename files to remove accents and whitespaces"
task :rename do
  Dir.foreach(".") do |f|
    unless (m = f.match(/Parte\s(.*)\sCap.+tulo-(.*)\.mp3/)).nil?
      File.rename(f.to_s, "P" + m[1] + "-Capitulo-" + m[2] + ".mp3")
      puts "#{f.to_s}: Removed accents and whitespaces from filename"      
    end
  end
end

desc "Fix ID3 tags"
task :fixid3  do
  ("01"..CHAPTERS_IN_PART1).each do |chapter|
    fix_tag("P1-Capitulo-#{chapter}.mp3", "1", TOTAL_PARTS, chapter, CHAPTERS_IN_PART1)
  end
  ("01"..CHAPTERS_IN_PART2).each do |chapter|
    fix_tag("P2-Capitulo-#{chapter}.mp3", "2", TOTAL_PARTS, chapter, CHAPTERS_IN_PART2)
  end
  puts "DONE!"
end

desc "Default: Download, rename and fix ID3 tags"
task :all => [:download, :rename, :fixid3]
  
task :default => [:all]