package dnsserver

import (
	"bytes"
	"crypto/tls"
	"net/http"
	"net/http/httptest"
	"regexp"
	"testing"

	"github.com/miekg/dns"
)

var (
	validPath = regexp.MustCompile("^/(dns-query|(?P<uuid>[0-9a-f]+))$")
	validator = func(r *http.Request) bool { return validPath.MatchString(r.URL.Path) }
)

func testServerHTTPS(t *testing.T, path string, validator func(*http.Request) bool) *http.Response {
	c := Config{
		Zone:                    "example.com.",
		Transport:               "https",
		TLSConfig:               &tls.Config{},
		ListenHosts:             []string{"127.0.0.1"},
		Port:                    "443",
		HTTPRequestValidateFunc: validator,
	}
	s, err := NewServerHTTPS("127.0.0.1:443", []*Config{&c})
	if err != nil {
		t.Log(err)
		t.Fatal("could not create HTTPS server")
	}
	m := new(dns.Msg)
	m.SetQuestion("example.org.", dns.TypeDNSKEY)
	buf, err := m.Pack()
	if err != nil {
		t.Fatal(err)
	}

	r := httptest.NewRequest(http.MethodPost, path, bytes.NewReader(buf))
	w := httptest.NewRecorder()
	s.ServeHTTP(w, r)

	return w.Result()
}

func TestCustomHTTPRequestValidator(t *testing.T) {
	testCases := map[string]struct {
		path      string
		expected  int
		validator func(*http.Request) bool
	}{
		"default":                     {"/dns-query", http.StatusOK, nil},
		"custom validator":            {"/b10cada", http.StatusOK, validator},
		"no validator set":            {"/adb10c", http.StatusNotFound, nil},
		"invalid path with validator": {"/helloworld", http.StatusNotFound, validator},
	}
	for name, tc := range testCases {
		t.Run(name, func(t *testing.T) {
			res := testServerHTTPS(t, tc.path, tc.validator)
			if res.StatusCode != tc.expected {
				t.Error("unexpected HTTP code", res.StatusCode)
			}
		})
	}
}