class ApiRecordingsController < ApiController

  before_filter :api_signed_in_user, :except => [ :add_like ]
  before_filter :look_up_recording, :only => [ :show, :stop, :claim, :discard, :keep ]
  before_filter :parse_filename, :only => [ :download, :upload_next_part, :upload_sign, :upload_part_complete, :upload_complete ]

  respond_to :json

  @@log = Logging.logger[ApiRecordingsController]

  def index
    # lists recordings created by for the current user
    @recordings = Recording.list_recordings(current_user, params[:created_by])
  end

  # Returns all files this user should be uploading from his client
  def list_uploads
    begin
      result = Recording.list_uploads(current_user, params[:limit], params[:since])
      render :json => result, :status => 200
    rescue
      render :json => { :message => "could not produce list of files" }, :status => 403
    end
  end

  # Returns all files that the user can download
  def list_downloads
    begin
      render :json => Recording.list_downloads(current_user, params[:limit], params[:since]), :status => 200
    rescue
      render :json => { :message => "could not produce list of files" }, :status => 403
    end
  end

  def show
  end

  def download
    raise PermissionError, ValidationMessages::PERMISSION_VALIDATION_ERROR unless @recorded_track.can_download?(current_user)

    @recorded_track.current_user = current_user
    @recorded_track.update_download_count

    @recorded_track.valid?
    if !@recorded_track.errors.any?
      @recorded_track.save!
      redirect_to @recorded_track.sign_url
    else
      render :json => { :message => "download limit surpassed" }, :status => 404
    end
  end

  def start
    music_session = ActiveMusicSession.find(params[:music_session_id])

    raise PermissionError, ValidationMessages::PERMISSION_VALIDATION_ERROR unless music_session.users.exists?(current_user)

    @recording = Recording.start(music_session, current_user)

    if @recording.errors.any?
      response.status = :unprocessable_entity
      respond_with @recording
    else
      respond_with @recording, responder: ApiResponder, :location => api_recordings_detail_url(@recording)
    end
  end
  
  def stop

    @recording.stop

    if @recording.errors.any?
      response.status = :unprocessable_entity
      respond_with @recording
    else
      respond_with @recording, responder: ApiResponder, :location => api_recordings_detail_url(@recording)
    end
  end

  # claim will create a claimed recording for the creator
  def claim
    claim = @recording.claim(current_user, params[:name], params[:description], Genre.find_by_id(params[:genre]), params[:is_public])

    if claim.errors.any?
      response.status = :unprocessable_entity
      respond_with claim
    else
      respond_with claim, responder: ApiResponder, :location => api_session_detail_url(claim)
    end
  end

  def add_comment
    if params[:id].blank?
      render :json => { :message => "Recording ID is required" }, :status => 400
      return
    end

    if params[:user_id].blank?
      render :json => { :message => "User ID is required" }, :status => 400
      return
    end

    if params[:comment].blank?
      render :json => { :message => "Comment is required" }, :status => 400
      return
    end

    comment = RecordingComment.new
    comment.recording_id = params[:id]
    comment.creator_id = params[:user_id]
    comment.comment = @@html_encoder.encode(params[:comment])
    comment.ip_address = request.remote_ip
    comment.save

    if comment.errors.any?
      render :json => { :message => "Unexpected error occurred" }, :status => 500
      return
    else
      render :json => {}, :status => 201
      return
    end
  end

  def add_like
    if params[:id].blank?
      render :json => { :message => "Recording ID is required" }, :status => 400
      return
    end

    liker = RecordingLiker.new
    liker.recording_id = params[:id]
    liker.liker_id = params[:user_id]
    liker.claimed_recording_id = params[:claimed_recording_id]
    liker.favorite = true
    liker.ip_address = request.remote_ip
    liker.save

    if liker.errors.any?
      render :json => { :message => "Unexpected error occurred" }, :status => 500
      return
    else
      render :json => {}, :status => 201
      return
    end
  end

  # discard will tell the server the user has no interest in the recording
  def discard
    @recording.discard(current_user)
    render :json => {}, :status => 200
  end

  def upload_next_part
    length = params[:length]
    md5 = params[:md5]

    @recorded_track.upload_next_part(length, md5)

    if @recorded_track.errors.any?

      response.status = :unprocessable_entity
      # this is not typical, but please don't change this line unless you are sure it won't break anything
      # this is needed because after_rollback in the RecordedTrackObserver touches the model and something about it's
      # state doesn't cause errors to shoot out like normal.
      render :json => { :errors => @recorded_track.errors }, :status => 422
    else
      result = {
          :part => @recorded_track.next_part_to_upload,
          :offset => @recorded_track.file_offset.to_s
      }

      render :json => result, :status => 200
    end

  end

  def upload_sign
    render :json => @recorded_track.upload_sign(params[:md5]), :status => 200
  end

  def upload_part_complete
    part = params[:part]
    offset = params[:offset]

    @recorded_track.upload_part_complete(part, offset)

    if @recorded_track.errors.any?
      response.status = :unprocessable_entity
      respond_with @recorded_track
    else
      render :json => {}, :status => 200
    end
  end
  
  def upload_complete
    @recorded_track.upload_complete
    @recorded_track.recording.upload_complete

    if @recorded_track.errors.any?
      response.status = :unprocessable_entity
      respond_with @recorded_track
      return
    else
      render :json => {}, :status => 200
    end
  end


  private
  def parse_filename
    @recorded_track = RecordedTrack.find_by_recording_id_and_client_track_id!(params[:id], params[:track_id])
    raise PermissionError, ValidationMessages::PERMISSION_VALIDATION_ERROR unless @recorded_track.recording.has_access?(current_user)
  end

  def look_up_recording
    @recording = Recording.find(params[:id])
    raise PermissionError, ValidationMessages::PERMISSION_VALIDATION_ERROR unless @recording.has_access?(current_user)
  end

end