package h2quic

import (
	"bytes"
	"io"
	"net/http"

	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"
)

type mockQuicRoundTripper struct{}

func (m *mockQuicRoundTripper) Dial() error {
	return nil
}
func (m *mockQuicRoundTripper) Do(req *http.Request) (*http.Response, error) {
	return &http.Response{Request: req}, nil
}

type mockBody struct {
	reader   bytes.Reader
	readErr  error
	closeErr error
	closed   bool
}

func (m *mockBody) Read(p []byte) (int, error) {
	if m.readErr != nil {
		return 0, m.readErr
	}
	return m.reader.Read(p)
}

func (m *mockBody) SetData(data []byte) {
	m.reader = *bytes.NewReader(data)
}

func (m *mockBody) Close() error {
	m.closed = true
	return m.closeErr
}

// make sure the mockBody can be used as a http.Request.Body
var _ io.ReadCloser = &mockBody{}

var _ = Describe("RoundTripper", func() {
	var (
		rt   *QuicRoundTripper
		req1 *http.Request
	)

	BeforeEach(func() {
		rt = &QuicRoundTripper{}
		var err error
		req1, err = http.NewRequest("GET", "https://www.example.org/file1.html", nil)
		Expect(err).ToNot(HaveOccurred())
	})

	It("reuses existing clients", func() {
		rt.clients = make(map[string]h2quicClient)
		rt.clients["www.example.org:443"] = &mockQuicRoundTripper{}
		rsp, err := rt.RoundTrip(req1)
		Expect(err).ToNot(HaveOccurred())
		Expect(rsp.Request).To(Equal(req1))
		Expect(rt.clients).To(HaveLen(1))
	})

	It("disable compression", func() {
		Expect(rt.disableCompression()).To(BeFalse())
		rt.DisableCompression = true
		Expect(rt.disableCompression()).To(BeTrue())
	})

	Context("validating request", func() {
		It("rejects plain HTTP requests", func() {
			req, err := http.NewRequest("GET", "http://www.example.org/", nil)
			req.Body = &mockBody{}
			Expect(err).ToNot(HaveOccurred())
			_, err = rt.RoundTrip(req)
			Expect(err).To(MatchError("quic: unsupported protocol scheme: http"))
			Expect(req.Body.(*mockBody).closed).To(BeTrue())
		})

		It("rejects requests without a URL", func() {
			req1.URL = nil
			req1.Body = &mockBody{}
			_, err := rt.RoundTrip(req1)
			Expect(err).To(MatchError("quic: nil Request.URL"))
			Expect(req1.Body.(*mockBody).closed).To(BeTrue())
		})

		It("rejects request without a URL Host", func() {
			req1.URL.Host = ""
			req1.Body = &mockBody{}
			_, err := rt.RoundTrip(req1)
			Expect(err).To(MatchError("quic: no Host in request URL"))
			Expect(req1.Body.(*mockBody).closed).To(BeTrue())
		})

		It("doesn't try to close the body if the request doesn't have one", func() {
			req1.URL = nil
			Expect(req1.Body).To(BeNil())
			_, err := rt.RoundTrip(req1)
			Expect(err).To(MatchError("quic: nil Request.URL"))
		})

		It("rejects requests without a header", func() {
			req1.Header = nil
			req1.Body = &mockBody{}
			_, err := rt.RoundTrip(req1)
			Expect(err).To(MatchError("quic: nil Request.Header"))
			Expect(req1.Body.(*mockBody).closed).To(BeTrue())
		})

		It("rejects requests with invalid header name fields", func() {
			req1.Header.Add("foobär", "value")
			_, err := rt.RoundTrip(req1)
			Expect(err).To(MatchError("quic: invalid http header field name \"foobär\""))
		})

		It("rejects requests with invalid header name values", func() {
			req1.Header.Add("foo", string([]byte{0x7}))
			_, err := rt.RoundTrip(req1)
			Expect(err.Error()).To(ContainSubstring("quic: invalid http header field value"))
		})

		It("rejects requests with an invalid request method", func() {
			req1.Method = "foobär"
			req1.Body = &mockBody{}
			_, err := rt.RoundTrip(req1)
			Expect(err).To(MatchError("quic: invalid method \"foobär\""))
			Expect(req1.Body.(*mockBody).closed).To(BeTrue())
		})
	})
})