require 'spec_helper'

def spec_file(file_name)
  Rails.root.join('spec', 'attachments', file_name)
end

describe Library do
  before :each do
    @spec_file = spec_file('books.csv')
  end

  context 'attachment validations' do
    subject { Library.create(name: 'XYZ Library', address: '123 Main St.') }
    it { subject.should have_valid(:attachment).when(nil, Attachment.new(io_stream: File.new(@spec_file))) }
    it {
      subject.should_not have_valid(:attachment).when(Attachment.new io_stream: File.new(Rails.root.join('spec', 'attachments', 'books.txt'))) }
  end

  context 'importing attachments' do
    before :each do
      @attachment = Attachment.new io_stream: File.new(@spec_file, 'rb')
    end

    subject { Library.create(name: 'XYZ Library', address: '123 Main St.') }

    context 'in the right format' do
      it 'should optionally allow an attachment' do
        subject.attachment = @attachment
        subject.attachment.should_not be_nil
        subject.attachment.attachable_type.should == 'Library'
        subject.attachment.io_stream_file_name.should == File.basename(@spec_file)
      end

      it 'should import a spreadsheet if it is in the right format' do
        subject.books.should be_empty
        lambda {
          subject.attachment = @attachment
        }.should change(subject.books, :count).by(5)
      end
    end

    context 'wrong extension' do
      before :each do
        @spec_file = spec_file('books.txt')
      end

      it 'should not import a spreadsheet if it has the wrong extension' do
        attachment = Attachment.new io_stream: File.new(@spec_file, 'rb')
        subject.attachment = attachment
        subject.should_not be_valid
      end

      it 'should not delete existing data if new upload has the wrong extension' do
        subject.attachment = @attachment
        attachment = Attachment.new io_stream: File.new(@spec_file, 'rb')
        lambda {
          subject.attachment = attachment
        }.should_not change(subject.books, :count)
      end

      it 'should not register / acknowledge the file is still in the system' do
        subject.attachment = @attachment
        attachment = Attachment.new io_stream: File.new(@spec_file, 'rb')
        lambda {
          subject.attachment = attachment
        }.should_not change(subject.attachment, :io_stream_file_name)
      end
    end

    context 'invalid headers' do
      before :each do
        @spec_file = spec_file('invalid_headers.csv')
      end

      it 'should not import a spreadsheet if it has invalid headers' do
        attachment = Attachment.new io_stream: File.new(@spec_file, 'rb')
        subject.attachment = attachment
        subject.should_not be_valid
      end

      it 'should not delete existing data if new upload has invalid headers' do
        subject.attachment = @attachment
        attachment = Attachment.new io_stream: File.new(@spec_file, 'rb')
        lambda {
          subject.attachment = attachment
        }.should_not change(subject.books, :count)
      end

      it 'should not register / acknowledge the file is still in the system' do
        subject.attachment = @attachment
        attachment = Attachment.new io_stream: File.new(@spec_file, 'rb')
        lambda {
          subject.attachment = attachment
        }.should_not change(subject.attachment, :io_stream_file_name)
      end
    end

    context 'failed instances' do
      before :each do
        @spec_file = spec_file('failed_instances.csv')
      end

      it 'should not import a spreadsheet if it has failed instances' do
        attachment = Attachment.new io_stream: File.new(@spec_file, 'rb')
        subject.attachment = attachment
        subject.should_not be_valid
      end

      it 'should not delete existing data if new upload has failed instances' do
        subject.attachment = @attachment
        attachment = Attachment.new io_stream: File.new(@spec_file, 'rb')
        lambda {
          subject.attachment = attachment
        }.should_not change(subject.books, :count)
      end

      it 'should not register / acknowledge the file is still in the system' do
        subject.attachment = @attachment
        attachment = Attachment.new io_stream: File.new(@spec_file, 'rb')
        lambda {
          subject.attachment = attachment
        }.should_not change(subject.attachment, :io_stream_file_name)
      end
    end

    context 'updating when an attachment already exists with destructive import' do
      it 'should delete the rows from old file and replace them with rows from new file' do
        subject.attachment = @attachment
        attachment = Attachment.new io_stream: File.new(spec_file('books2.csv'), 'rb')
        lambda {
          subject.attachment = attachment
        }.should change(subject.books, :count).by(-2)
      end
    end

    context 'assigning attachment to new record' do
      subject { Library.new(name: 'XYZ Library', address: '123 Main St.') }

      it 'should not import when the record is not persisted' do
        lambda {
          subject.attachment = @attachment
        }.should_not change(subject.books, :count)
      end

      it 'should import upon saving the record' do
        lambda {
          subject.attachment = @attachment
          subject.save
        }.should change(subject.books, :count).by(5)
      end
    end
  end

end