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#   University.  Licensed under the Apache License, Version 2.0 (the "License");
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require 'aws-sdk'
require 'rails_helper'

describe FileLocator, type: :service do
  before do
    Aws.config[:stub_responses] = true
  end

  describe 'S3File Class' do
    let(:bucket) { "mybucket" }
    let(:key) { "mykey.mp4" }
    let(:s3file) { FileLocator::S3File.new("s3://#{bucket}/#{key}") }

    it "is able to initialize from an S3 URI" do
      expect(s3file.bucket).to eq bucket
      expect(s3file.key).to eq key
    end

    it "returns an S3 Object" do
      s3_object = s3file.object
      expect(s3_object).to be_an Aws::S3::Object
      expect(s3_object.bucket_name).to eq bucket
      expect(s3_object.key).to eq key
    end
  end

  describe "Local file" do
    let(:path) { "/path/to/file.mp4" }
    let(:source) { "file://#{path}" }
    let(:locator) { FileLocator.new(source) }

    it "returns the correct uri" do
      expect(locator.uri).to eq Addressable::URI.parse(source)
    end

    it "returns the correct location" do
      expect(locator.location).to eq path
    end

    it "tells if file exists" do
      allow(File).to receive(:exist?).with(path) { true }
      expect(locator.exist?).to be_truthy
    end

    context "return file" do
      let(:file) { double(File) }
      before do
        allow(File).to receive(:open).and_return file
      end

      it "returns reader" do
        expect(locator.reader).to eq file
      end

      it "returns attachment" do
        expect(locator.attachment).to eq file
      end
    end
  end

  describe "s3 file" do
    let(:bucket) { "mybucket" }
    let(:key) { "mykey.mp4" }
    let(:source) { "s3://#{bucket}/#{key}" }
    let(:locator) { FileLocator.new(source) }

    it "returns the correct uri" do
      expect(locator.uri).to eq Addressable::URI.parse(source)
    end

    it "returns the correct location" do
      expect(locator.location).to start_with "https://#{bucket}.s3.us-stubbed-1.amazonaws.com/#{key}"
    end

    it "tells if file exists" do
      expect(locator.exist?).to be_truthy
    end

    it "returns reader" do
      expect(locator.reader).to be_a StringIO
    end

    it "returns attachment" do
      expect(locator.attachment).to eq Addressable::URI.parse(source)
    end
  end

  describe "Other file" do
    let(:path) { "/path/to/file.mp4" }
    let(:source) { "bogus://#{path}" }
    let(:locator) { FileLocator.new(source) }

    it "returns the correct uri" do
      expect(locator.uri).to eq Addressable::URI.parse(source)
    end

    it "returns the correct location" do
      expect(locator.location).to eq source
    end

    it "tells if file exists" do
      expect(locator.exist?).to be_falsy
    end

    it "returns reader" do
      io = double(IO)
      allow(Kernel).to receive(:open).and_return io
      expect(locator.reader).to eq io
    end

    it "returns attachment" do
      expect(locator.attachment).to eq locator.location
    end
  end
end