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require 'u3d/cache'
require 'json'
require 'time'

describe U3d do
  describe U3d::Cache do
    describe '#initialize' do
      context 'invalid args' do
        it 'fails if offline and force_refresh are set' do
          expect do
            U3d::Cache.new(force_refresh: true, offline: true)
          end.to raise_error(RuntimeError, /Cache: cannot specify both offline and force_refresh/)
        end
      end
      context 'when there is no cache file' do
        before(:each) do
          allow(U3dCore::Helper).to receive(:ubuntu_on_windows?) { false }
          allow(File).to receive(:file?) { false }
        end

        it 'retrieves versions' do
          expect(U3d::UnityVersions).to receive(:list_available)

          U3d::Cache.new
        end

        it 'creates a cache file' do
          allow(U3d::UnityVersions).to receive(:list_available) { { 'test' => 'url' } }
          expect(File).to receive(:write).with(anything, anything)

          U3d::Cache.new
        end

        it 'writes to the cache file' do
          allow(U3d::UnityVersions).to receive(:list_available)

          expect(File).to receive(:write).with(anything, anything)

          U3d::Cache.new
        end
      end

      context 'when there is a cache file' do
        it 'checks if the file is up-to-date' do
          allow(U3d::UnityVersions).to receive(:list_available) { { 'test' => 'url' } }
          file = double('file')
          cache = '{' \
                  '"win":{"lastupdate":0,"versions":{"version": "url"}},' \
                  '"mac":{"lastupdate":0,"versions":{"version": "url"}},' \
                  '"linux":{"lastupdate":0,"versions":{"version": "url"}}' \
                  '}'
          allow(File).to receive(:file?) { true }
          allow(File).to receive(:open).with(anything, 'r').and_yield(file)
          allow(file).to receive(:read) { cache }
          expect(Time).to receive(:now).at_least(:once) { 0 }
          allow(File).to receive(:open).with(anything, 'w')

          U3d::Cache.new
        end

        context 'when cache file is outdated' do
          before(:each) do
            file = double('file')
            cache = '{' \
                    '"win":{"lastupdate":0,"versions":{"version": "url"}},' \
                    '"mac":{"lastupdate":0,"versions":{"version": "url"}},' \
                    '"linux":{"lastupdate":0,"versions":{"version": "url"}}' \
                    '}'
            allow(File).to receive(:file?) { true }
            allow(File).to receive(:open).with(anything, 'r').and_yield(file)
            allow(file).to receive(:read) { cache }
            allow(File).to receive(:open).with(anything, 'w')
            allow(File).to receive(:delete)
          end

          it 'retrieves versions' do
            expect(U3d::UnityVersions).to receive(:list_available)

            U3d::Cache.new
          end

          it 'writes to the cache file' do
            allow(U3d::UnityVersions).to receive(:list_available)

            expect(File).to receive(:write).with(anything, anything)

            U3d::Cache.new
          end
        end

        context 'when cache file is fresh' do
          before(:each) do
            file = double('file')
            cache = '{' \
                    '"win":{"lastupdate":' + Time.now.to_i.to_s + ',"versions":{"version": "url"}},' \
                                                                  '"mac":{"lastupdate":' + Time.now.to_i.to_s + ',"versions":{"version": "url"}},' \
                                                                                                                '"linux":{"lastupdate":' + Time.now.to_i.to_s + ',"versions":{"version": "url"}}' \
                                                                                                                                                                '}'
            allow(File).to receive(:file?) { true }
            allow(File).to receive(:open).with(anything, 'r').and_yield(file)
            allow(file).to receive(:read) { cache }
          end

          it 'does not overwrite cache' do
            expect(File).not_to receive(:open).with(anything, 'w')

            U3d::Cache.new
          end
        end
      end
    end

    describe '#[]' do
      context 'when there is no cache file' do
        before(:each) do
          allow(File).to receive(:file?) { false }
        end

        let(:cache) { U3d::Cache.new(offline: true) }

        it "doesn't retrieve versions" do
          expect(cache["win"]).to eq(nil)
        end
      end

      context 'when there is a cache file' do
        before(:each) do
          allow(U3d::UnityVersions).to receive(:list_available)
          file = double('file')
          cache_data = '{' \
                       '"win":{"lastupdate":' + Time.now.to_i.to_s + ',"versions":{"key": "url"}},' \
                                                                     '"mac":{"lastupdate":' + Time.now.to_i.to_s + ',"versions":{"key": "url"}},' \
                                                                                                                   '"linux":{"lastupdate":' + Time.now.to_i.to_s + ',"versions":{"key": "url"}}' \
                                                                                                                                                                   '}'
          allow(File).to receive(:file?) { true }
          allow(File).to receive(:open).with(anything, 'r').and_yield(file)
          allow(file).to receive(:read) { cache_data }
        end

        it 'returns correct object with a matching key' do
          cache = U3d::Cache.new
          expect(cache['win']['versions']['key']).to eql('url')
        end

        it 'returns nil with wrong key' do
          cache = U3d::Cache.new
          expect(cache['win']['versions']['notakey']).not_to eql('url')
          expect(cache['win']['versions']['notakey']).to be_nil
        end
      end
    end
  end
end
