require 'spec_helper'
require 'fin/shared_examples.rb'

describe Fin::DealList do
  subject { Fin::DealList.new }
  let(:item_index) { @item.deal_id }
  let (:new_item_book_index) {new_item.deal_id}

  before(:each) do
    @item = Fin::Deal.new :isin_id => 1234, :deal_id => 0, :price => 20
    @item1 = Fin::Deal.new :isin_id => 1234, :deal_id => 1, :price => 10
    @same_isin_item = @item1
    @item2 = Fin::Deal.new :isin_id => 5678, :deal_id => 2, :price => 10
    @diff_isin_item = @item2
    @zero_price_item = Fin::Deal.new :isin_id => 1234, :deal_id => 3, :price => 0
    @repeat_item = Fin::Deal.new :isin_id => 1234, :deal_id => 0, :price => 13
  end

  it_behaves_like 'changed_list'

  specify { subject.books.should be_empty }

  it 'returns book for any isin_id, even if it was not initialized' do
    book = subject.books[1313]
    book.should_not be_nil
    book.should be_an Fin::Book
    book.should be_empty
  end

  describe 'adding item' do
    let(:expected_number_of_books) { 1 }

    context 'to empty QuoteList' do
      let(:new_item) { @item }

      it_behaves_like 'adding_item_to_books'
    end

    context 'to non-empty QuoteList' do
      before(:each) do
        subject.add(@item).size.should == 1
      end

      context 'with existing isin' do
        let(:new_item) { @same_isin_item }

        it_behaves_like 'adding_item_to_books'
      end

      context 'with different isin' do
        let(:new_item) { @diff_isin_item }
        let(:expected_number_of_books) { 2 }

        it_behaves_like 'adding_item_to_books'
      end

      context 'with zero price' do
        let(:new_item) { @zero_price_item }

        it_behaves_like 'adding_item_to_books'
      end
    end
  end

  describe 'removing item' do
    before(:each) do
      subject.add(@item).size.should == 1
    end

    context 'with existing item' do
      let(:unwanted_item) { @item }
      let(:expected_size) { 0 }

      it 'deletes item from the list' do
        subject.remove(unwanted_item)
        subject[unwanted_item.deal_id].should == nil
        subject.size.should == expected_size
      end

      it 'removes item from its related book' do
        subject.remove(unwanted_item)
        subject.books[unwanted_item.isin_id].should_not have_key unwanted_item.deal_id
      end
    end

    context 'with non-existing item' do
      let(:unwanted_item) { @item1 }
      let(:expected_size) { 1 }

      it 'still returns the list itself' do
        subject.remove(unwanted_item).should == subject
      end

      it 'deletes nothing from the list' do
        subject.remove(unwanted_item)
        subject[item_index].should == @item
        subject.size.should == expected_size
      end
    end
  end
end