module Gitegnore

# File lib/gitegnore.rb, line 13
def self.fetch(name)
  self.check

  all_ig_names = self.all_gitignores_in_repo
  base_path = self.repo_dir

  name = "#{name}.gitignore" unless name.end_with? ".gitignore"

  all_ig_names.each do |ig_name|
    if ig_name.casecmp(name) == 0
      puts "found #{name}! copy to current directory..."
      FileUtils.cp "#{base_path}/#{ig_name}", "#{Dir.pwd}/.gitignore"
      return
    end
  end

  raise RuntimeError, "#{name}.gitignore not found"
end

# File lib/gitegnore.rb, line 7
def self.list
  self.check

  return all_gitignores_in_repo
end

# File lib/gitegnore.rb, line 133
def self.all_gitignores_in_repo
  raise RuntimeError, "repo does exists" if repo_exists? == false

  all_files = self.change_pwd_do_sth(repo_dir, "git ls-files -z")
  all_gitignore_files = all_files.split("\x0").reject do |f|
                          f.match(%r{^(.github|Global)/})
                        end
  return all_gitignore_files
end

# File lib/gitegnore.rb, line 143
def self.change_pwd_do_sth(new_pwd, action)
  previous_pwd = Dir.pwd
  FileUtils.cd new_pwd
  result = `#{action}`
  FileUtils.cd previous_pwd
  return result
end

# File lib/gitegnore.rb, line 43
def self.check
  # create the repo if not exists
  if repo_exists? == false
    create_repo_env
  end

  # update repo to latest
  if self.need_to_update_repo?
    self.repo_fetch
  end
end

# File lib/gitegnore.rb, line 97
def self.create_repo_env
  raise RuntimeError, "repo does exists" if repo_exists? == true

  # create the directory
  repo_parent_dir = File.expand_path("~/#{GITHUB_BASE_DIR}/#{GITIGNORE_REPO_USERNAME}")
  FileUtils::mkdir_p repo_parent_dir # TODO have not check whether create success or fail

  raise RuntimeError, "dir: #{repo_parent_dir} create failed" unless File.directory?(repo_parent_dir)

  # git clone the repo
  self.change_pwd_do_sth(repo_parent_dir, "git clone #{GITIGNORE_REPO_URL} 2> /dev/null")

  raise RuntimeError, "repo does not exists" if repo_exists? == false
end

# File lib/gitegnore.rb, line 73
def self.need_to_update_repo?
  update_record = repo_update_date
  repo_name = "#{GITIGNORE_REPO_USERNAME}/#{GITIGNORE_REPO_NAME}"
  last_update_date_str = update_record[repo_name]
  if last_update_date_str == nil
    return true
  end

  date_format = "%Y-%m-%d"
  last_update_date = Date::strptime(last_update_date_str, date_format)
  return last_update_date < (Date.today - 7)
end

# File lib/gitegnore.rb, line 55
def self.repo_dir
  File.expand_path("~/" + GITHUB_BASE_DIR + "/" + GITIGNORE_REPO_USERNAME + "/" + GITIGNORE_REPO_NAME)
end

# File lib/gitegnore.rb, line 86
def self.repo_exists?
  if Dir.exist?(repo_dir)
    origin_remote_url = self.change_pwd_do_sth(repo_dir, "git remote get-url origin").strip
    if origin_remote_url == GITIGNORE_REPO_URL
      return true
    end
  end

  return false;
end

# File lib/gitegnore.rb, line 112
def self.repo_fetch
  raise RuntimeError, "repo does exists" if repo_exists? == false

  puts "fetching upstream updates..."
  result = self.change_pwd_do_sth(repo_dir, "git pull origin master 2> /dev/null").strip
  if result == "Already up-to-date."
    update_record = repo_update_date
    repo_name = "#{GITIGNORE_REPO_USERNAME}/#{GITIGNORE_REPO_NAME}"
    today_date = DateTime.now.strftime('%Y-%m-%d')
    update_record[repo_name] = today_date

    File.open(self.update_record_path, "w") do |f|
      f.write(update_record.to_json)
    end
    puts "done...."
  else
    puts "some error happened: #{result}"
  end

end

# File lib/gitegnore.rb, line 63
def self.repo_update_date
  repo_update_record_path = self.update_record_path
  repo_update_record = {}
  if File.exists? repo_update_record_path
    file = File.read(repo_update_record_path)
    repo_update_record = JSON.parse(file)
  end
  return repo_update_record
end

# File lib/gitegnore.rb, line 59
def self.update_record_path
  File.expand_path("~/" + GITHUB_BASE_DIR + "/" + REPO_UPDATE_RECORD)
end

# File lib/gitegnore.rb, line 153
def add_custom_name(custom_name, language_name)

end