class Brain

# File lib/sheldon/brain.rb, line 5
def initialize(sheldon_data_dir)
  @location = sheldon_data_dir
  @memory = Memory.new(@location)
end

# File lib/sheldon/brain.rb, line 10
def forget(recall_cue)
  entry = memory.recall(recall_cue)
  brain_path = brain_directory_for_cue(recall_cue)
  destination_path = add_home(entry[:filepath])
  FileUtils.rm_r(destination_path) if File.symlink?(destination_path)
  FileUtils.rm_r(brain_path) if Dir.exist?(brain_path)

  memory.forget(recall_cue)
end

# File lib/sheldon/brain.rb, line 20
def has_cue?(recall_cue)
  memory.has_cue?(recall_cue)
end

# File lib/sheldon/brain.rb, line 24
def learn(recall_cue, abs_learn_path)
  raise "recall cue cannot be empty." if recall_cue.strip.empty?
  raise "This cue has already been used." if has_cue?(recall_cue)
  raise "Unable to find a file or folder at #{abs_learn_path}" unless File.exist?(abs_learn_path)

  brain_path = brain_directory_for_cue(recall_cue)
  FileUtils.mkdir_p(brain_path)
  FileUtils.mv(abs_learn_path, brain_path)
  entry = { filepath: remove_home(abs_learn_path) }
  memory.add(recall_cue, entry)
end

# File lib/sheldon/brain.rb, line 36
def list_cues
  memory.list_cues
end

# File lib/sheldon/brain.rb, line 40
def path_for_cue(recall_cue)
  raise "no entry for cue '#{recall_cue}'" unless memory.has_cue?(recall_cue)
  brain_directory = brain_directory_for_cue(recall_cue)
  get_content(brain_directory)
end

# File lib/sheldon/brain.rb, line 46
def present?
  memory.present?
end

# File lib/sheldon/brain.rb, line 50
def recall(recall_cue, opts={})
  # Compute the absolute paths for recall
  brain_path = brain_directory_for_cue(recall_cue)
  entry = memory.recall(recall_cue)
  destination_path = add_home(entry[:filepath])
  destination_dir = File.dirname(destination_path)

  # Handle the destination file / directory already existing on the filesystem
  if File.exist?(destination_path)
    if opts[:overwrite]
      FileUtils.remove_dir(destination_path) # this (badly named) method deletes both files and folders
    else
      raise DestinationNotEmptyException, "#{destination_path} already exists."
    end
  end

  # Create the destination directory if required
  FileUtils.mkdir_p(destination_dir) unless File.directory?(destination_dir)

  # Create the symbolic link between sheldon's brain and the destination
  FileUtils.ln_s(get_content(brain_path), destination_path)

  return recalled?(recall_cue)
end

# File lib/sheldon/brain.rb, line 75
def recalled?(recall_cue)
  entry = memory.recall(recall_cue)
  destination_path = add_home(entry[:filepath])
  destination_dir = File.dirname(destination_path)
  # Check for presence of symlink and that the symlink isn't broken
  File.symlink?(destination_path) && File.exists?(File.readlink(destination_path))
end

# File lib/sheldon/brain.rb, line 83
def size
  memory.size
end

# File lib/sheldon/brain.rb, line 89
def brain_directory_for_cue(recall_cue)
  File.join(@location, recall_cue)
end

# File lib/sheldon/brain.rb, line 93
def get_content(path)
  basename = (Dir.entries(path) - [".", "..", ".DS_Store"]).first
  File.join(path, basename)
end