package home

import (
	"net/http"
	"net/netip"
	"net/textproto"
	"net/url"
	"path/filepath"
	"testing"

	"github.com/AdguardTeam/golibs/httphdr"
	"github.com/AdguardTeam/golibs/testutil"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// implements http.ResponseWriter
type testResponseWriter struct {
	hdr        http.Header
	statusCode int
}

func (w *testResponseWriter) Header() http.Header {
	return w.hdr
}

func (w *testResponseWriter) Write([]byte) (int, error) {
	return 0, nil
}

func (w *testResponseWriter) WriteHeader(statusCode int) {
	w.statusCode = statusCode
}

func TestAuthHTTP(t *testing.T) {
	dir := t.TempDir()
	fn := filepath.Join(dir, "sessions.db")

	users := []webUser{
		{Name: "name", PasswordHash: "$2y$05$..vyzAECIhJPfaQiOK17IukcQnqEgKJHy0iETyYqxn3YXJl8yZuo2"},
	}
	Context.auth = InitAuth(fn, users, 60, nil, nil)

	handlerCalled := false
	handler := func(_ http.ResponseWriter, _ *http.Request) {
		handlerCalled = true
	}
	handler2 := optionalAuth(handler)
	w := testResponseWriter{}
	w.hdr = make(http.Header)
	r := http.Request{}
	r.Header = make(http.Header)
	r.Method = http.MethodGet

	// get / - we're redirected to login page
	r.URL = &url.URL{Path: "/"}
	handlerCalled = false
	handler2(&w, &r)
	assert.Equal(t, http.StatusFound, w.statusCode)
	assert.NotEmpty(t, w.hdr.Get(httphdr.Location))
	assert.False(t, handlerCalled)

	// go to login page
	loginURL := w.hdr.Get(httphdr.Location)
	r.URL = &url.URL{Path: loginURL}
	handlerCalled = false
	handler2(&w, &r)
	assert.True(t, handlerCalled)

	// perform login
	cookie, err := Context.auth.newCookie(loginJSON{Name: "name", Password: "password"}, "")
	require.NoError(t, err)
	require.NotNil(t, cookie)

	// get /
	handler2 = optionalAuth(handler)
	w.hdr = make(http.Header)
	r.Header.Set(httphdr.Cookie, cookie.String())
	r.URL = &url.URL{Path: "/"}
	handlerCalled = false
	handler2(&w, &r)
	assert.True(t, handlerCalled)

	r.Header.Del(httphdr.Cookie)

	// get / with basic auth
	handler2 = optionalAuth(handler)
	w.hdr = make(http.Header)
	r.URL = &url.URL{Path: "/"}
	r.SetBasicAuth("name", "password")
	handlerCalled = false
	handler2(&w, &r)
	assert.True(t, handlerCalled)
	r.Header.Del(httphdr.Authorization)

	// get login page with a valid cookie - we're redirected to /
	handler2 = optionalAuth(handler)
	w.hdr = make(http.Header)
	r.Header.Set(httphdr.Cookie, cookie.String())
	r.URL = &url.URL{Path: loginURL}
	handlerCalled = false
	handler2(&w, &r)
	assert.NotEmpty(t, w.hdr.Get(httphdr.Location))
	assert.False(t, handlerCalled)
	r.Header.Del(httphdr.Cookie)

	// get login page with an invalid cookie
	handler2 = optionalAuth(handler)
	w.hdr = make(http.Header)
	r.Header.Set(httphdr.Cookie, "bad")
	r.URL = &url.URL{Path: loginURL}
	handlerCalled = false
	handler2(&w, &r)
	assert.True(t, handlerCalled)
	r.Header.Del(httphdr.Cookie)

	Context.auth.Close()
}

func TestRealIP(t *testing.T) {
	const remoteAddr = "1.2.3.4:5678"

	testCases := []struct {
		name       string
		header     http.Header
		remoteAddr string
		wantErrMsg string
		wantIP     netip.Addr
	}{{
		name:       "success_no_proxy",
		header:     nil,
		remoteAddr: remoteAddr,
		wantErrMsg: "",
		wantIP:     netip.MustParseAddr("1.2.3.4"),
	}, {
		name: "success_proxy",
		header: http.Header{
			textproto.CanonicalMIMEHeaderKey(httphdr.XRealIP): []string{"1.2.3.5"},
		},
		remoteAddr: remoteAddr,
		wantErrMsg: "",
		wantIP:     netip.MustParseAddr("1.2.3.5"),
	}, {
		name: "success_proxy_multiple",
		header: http.Header{
			textproto.CanonicalMIMEHeaderKey(httphdr.XForwardedFor): []string{
				"1.2.3.6, 1.2.3.5",
			},
		},
		remoteAddr: remoteAddr,
		wantErrMsg: "",
		wantIP:     netip.MustParseAddr("1.2.3.6"),
	}, {
		name:       "error_no_proxy",
		header:     nil,
		remoteAddr: "1:::2",
		wantErrMsg: `getting ip from client addr: address 1:::2: ` +
			`too many colons in address`,
		wantIP: netip.Addr{},
	}}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			r := &http.Request{
				Header:     tc.header,
				RemoteAddr: tc.remoteAddr,
			}

			ip, err := realIP(r)
			assert.Equal(t, tc.wantIP, ip)

			testutil.AssertErrorMsg(t, tc.wantErrMsg, err)
		})
	}
}