require 'rails_helper'

RSpec.describe Preview::ThumbnailFetcher do
  describe '.fetch' do
    it 'rejects svg thumbnails' do
      page = Preview::HttpFetcher::Response.new(
          '<meta property="og:image" content="https://example.com/thumb.svg">',
          'text/html',
          'https://example.com/page')
      svg = Preview::HttpFetcher::Response.new(
          '<svg></svg>',
          'image/svg+xml',
          'https://example.com/thumb.svg')

      allow(Preview::UrlSafety).to receive(:validate)
          .and_return([URI.parse('https://example.com/page'), ['203.0.113.10']])
      allow(Preview::HttpFetcher).to receive(:fetch)
          .with('https://example.com/page', max_bytes: described_class::HTML_MAX_BYTES)
          .and_return(page)
      allow(Preview::HttpFetcher).to receive(:fetch)
          .with('https://example.com/thumb.svg')
          .and_return(svg)

      expect {
        described_class.fetch('https://example.com/page')
      }.to raise_error(Preview::ThumbnailFetcher::GenerationFailed)
    end

    it 'accepts allowed image content type with parameters' do
      page = Preview::HttpFetcher::Response.new(
          '<meta property="og:image" content="https://example.com/thumb.jpg">',
          'text/html',
          'https://example.com/page')
      image = Preview::HttpFetcher::Response.new(
          'jpeg-bytes',
          'image/jpeg; charset=binary',
          'https://example.com/thumb.jpg')

      allow(Preview::UrlSafety).to receive(:validate)
          .and_return([URI.parse('https://example.com/page'), ['203.0.113.10']])
      allow(Preview::HttpFetcher).to receive(:fetch)
          .with('https://example.com/page', max_bytes: described_class::HTML_MAX_BYTES)
          .and_return(page)
      allow(Preview::HttpFetcher).to receive(:fetch)
          .with('https://example.com/thumb.jpg')
          .and_return(image)

      expect(described_class.fetch('https://example.com/page')).to eq('jpeg-bytes')
    end
  end
end