package providers

import (
	"net/http"
	"net/http/httptest"
	"net/url"
	"testing"

	"github.com/bmizerany/assert"
	"github.com/pusher/oauth2_proxy/pkg/apis/sessions"
)

const imaginaryAccessToken = "imaginary_access_token"
const bearerAccessToken = "Bearer " + imaginaryAccessToken

func testKeycloakProvider(hostname, group string) *KeycloakProvider {
	p := NewKeycloakProvider(
		&ProviderData{
			ProviderName: "",
			LoginURL:     &url.URL{},
			RedeemURL:    &url.URL{},
			ProfileURL:   &url.URL{},
			ValidateURL:  &url.URL{},
			Scope:        ""})

	if group != "" {
		p.SetGroup(group)
	}

	if hostname != "" {
		updateURL(p.Data().LoginURL, hostname)
		updateURL(p.Data().RedeemURL, hostname)
		updateURL(p.Data().ProfileURL, hostname)
		updateURL(p.Data().ValidateURL, hostname)
	}
	return p
}

func testKeycloakBackend(payload string) *httptest.Server {
	path := "/api/v3/user"

	return httptest.NewServer(http.HandlerFunc(
		func(w http.ResponseWriter, r *http.Request) {
			url := r.URL
			if url.Path != path {
				w.WriteHeader(404)
			} else if r.Header.Get("Authorization") != bearerAccessToken {
				w.WriteHeader(403)
			} else {
				w.WriteHeader(200)
				w.Write([]byte(payload))
			}
		}))
}

func TestKeycloakProviderDefaults(t *testing.T) {
	p := testKeycloakProvider("", "")
	assert.NotEqual(t, nil, p)
	assert.Equal(t, "Keycloak", p.Data().ProviderName)
	assert.Equal(t, "https://keycloak.org/oauth/authorize",
		p.Data().LoginURL.String())
	assert.Equal(t, "https://keycloak.org/oauth/token",
		p.Data().RedeemURL.String())
	assert.Equal(t, "https://keycloak.org/api/v3/user",
		p.Data().ValidateURL.String())
	assert.Equal(t, "api", p.Data().Scope)
}

func TestKeycloakProviderOverrides(t *testing.T) {
	p := NewKeycloakProvider(
		&ProviderData{
			LoginURL: &url.URL{
				Scheme: "https",
				Host:   "example.com",
				Path:   "/oauth/auth"},
			RedeemURL: &url.URL{
				Scheme: "https",
				Host:   "example.com",
				Path:   "/oauth/token"},
			ValidateURL: &url.URL{
				Scheme: "https",
				Host:   "example.com",
				Path:   "/api/v3/user"},
			Scope: "profile"})
	assert.NotEqual(t, nil, p)
	assert.Equal(t, "Keycloak", p.Data().ProviderName)
	assert.Equal(t, "https://example.com/oauth/auth",
		p.Data().LoginURL.String())
	assert.Equal(t, "https://example.com/oauth/token",
		p.Data().RedeemURL.String())
	assert.Equal(t, "https://example.com/api/v3/user",
		p.Data().ValidateURL.String())
	assert.Equal(t, "profile", p.Data().Scope)
}

func TestKeycloakProviderGetEmailAddress(t *testing.T) {
	b := testKeycloakBackend("{\"email\": \"michael.bland@gsa.gov\"}")
	defer b.Close()

	bURL, _ := url.Parse(b.URL)
	p := testKeycloakProvider(bURL.Host, "")

	session := &sessions.SessionState{AccessToken: imaginaryAccessToken}
	email, err := p.GetEmailAddress(session)
	assert.Equal(t, nil, err)
	assert.Equal(t, "michael.bland@gsa.gov", email)
}

func TestKeycloakProviderGetEmailAddressAndGroup(t *testing.T) {
	b := testKeycloakBackend("{\"email\": \"michael.bland@gsa.gov\", \"groups\": [\"test-grp1\", \"test-grp2\"]}")
	defer b.Close()

	bURL, _ := url.Parse(b.URL)
	p := testKeycloakProvider(bURL.Host, "test-grp1")

	session := &sessions.SessionState{AccessToken: imaginaryAccessToken}
	email, err := p.GetEmailAddress(session)
	assert.Equal(t, nil, err)
	assert.Equal(t, "michael.bland@gsa.gov", email)
}

// Note that trying to trigger the "failed building request" case is not
// practical, since the only way it can fail is if the URL fails to parse.
func TestKeycloakProviderGetEmailAddressFailedRequest(t *testing.T) {
	b := testKeycloakBackend("unused payload")
	defer b.Close()

	bURL, _ := url.Parse(b.URL)
	p := testKeycloakProvider(bURL.Host, "")

	// We'll trigger a request failure by using an unexpected access
	// token. Alternatively, we could allow the parsing of the payload as
	// JSON to fail.
	session := &sessions.SessionState{AccessToken: "unexpected_access_token"}
	email, err := p.GetEmailAddress(session)
	assert.NotEqual(t, nil, err)
	assert.Equal(t, "", email)
}

func TestKeycloakProviderGetEmailAddressEmailNotPresentInPayload(t *testing.T) {
	b := testKeycloakBackend("{\"foo\": \"bar\"}")
	defer b.Close()

	bURL, _ := url.Parse(b.URL)
	p := testKeycloakProvider(bURL.Host, "")

	session := &sessions.SessionState{AccessToken: imaginaryAccessToken}
	email, err := p.GetEmailAddress(session)
	assert.NotEqual(t, nil, err)
	assert.Equal(t, "", email)
}