# encoding: UTF-8
#
# Copyright (c) 2010-2017 GoodData Corporation. All rights reserved.
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.

require 'gooddata/helpers/data_helper'

describe GoodData::Helpers::DataSource do
  let(:file_size) { 666 }

  before :each do
    @s3_client = double('s3_client')
    @bucket = double('bucket')
    @objects = double('objects')

    allow(@s3_client).to receive(:bucket) { @bucket }
    allow(@bucket).to receive(:object) { @objects }
    allow(@objects).to receive(:get) { StringIO.new('aaa') }
    allow(@objects).to receive(:size) { file_size }
    allow(File).to receive(:size) { file_size }

    @ds = GoodData::Helpers::DataSource.new(type: :s3, bucket: 'some_bucket', key: 'some_key')
  end

  it 'should be able to handle AWS' do
    expect(@ds.realized?).to be_falsey
    params = { 'aws_client' => { 's3_client' => @s3_client } }
    expect(@ds.realize(params)).to eq '2bdc6c8a02b2bd1d7997cf17f0848ecfcbceba25ca184e2676f19c054db7139b'
    expect(@ds.realized?).to be_truthy
  end

  it 'should gracefully handle missing aws client' do
    expect do
      @ds.realize('aws_client' => nil)
    end.to raise_exception "AWS client not present. Perhaps S3Middleware is missing in the brick definition?"
  end

  it 'should gracefully handle missing data source params - bucket' do
    ds = GoodData::Helpers::DataSource.new(type: :s3, key: 'some_key')
    params = { 'aws_client' => { 's3_client' => @s3_client } }
    expect do
      ds.realize(params)
    end.to raise_exception 'Key "bucket" is missing in S3 datasource'
  end

  it 'should gracefully handle missing data source params - key' do
    ds = GoodData::Helpers::DataSource.new(type: :s3, bucket: 'some_bucket')
    params = { 'aws_client' => { 's3_client' => @s3_client } }
    expect do
      ds.realize(params)
    end.to raise_exception 'Key "key" is missing in S3 datasource'
  end

  context 'when size of the downloaded file is not right' do
    before do
      allow(File).to receive(:size) { 0 }
    end

    it 'raises an error' do
      params = { 'aws_client' => { 's3_client' => @s3_client } }
      expect do
        @ds.realize(params)
      end.to raise_exception(/Expected size 666, got 0/)
    end
  end
end