package socialconnect

import (
	"context"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

func TestTikTokAuthorizationURL(t *testing.T) {
	c := NewTikTokConnector("client-key-123", "secret", "https://app.deklarix.de/oauth/tiktok/callback")
	u := c.AuthorizationURL("state-xyz")

	for _, want := range []string{
		"https://www.tiktok.com/v2/auth/authorize/?",
		"client_key=client-key-123",
		"state=state-xyz",
		"response_type=code",
	} {
		if !strings.Contains(u, want) {
			t.Errorf("AuthorizationURL = %q, want it to contain %q", u, want)
		}
	}
}

func TestTikTokExchangeSuccess(t *testing.T) {
	tokenServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if err := r.ParseForm(); err != nil {
			t.Fatalf("ParseForm: %v", err)
		}
		if r.FormValue("client_key") != "client-key-123" {
			t.Errorf("client_key = %q, want client-key-123", r.FormValue("client_key"))
		}
		w.Header().Set("Content-Type", "application/json")
		w.Write([]byte(`{"access_token":"tt-access","refresh_token":"tt-refresh","expires_in":86400,"open_id":"tt-open-id-1"}`))
	}))
	defer tokenServer.Close()

	c := NewTikTokConnector("client-key-123", "secret", "https://app.deklarix.de/oauth/tiktok/callback")
	c.TokenURL = tokenServer.URL

	tok, err := c.Exchange(context.Background(), "der-code")
	if err != nil {
		t.Fatalf("Exchange: %v", err)
	}
	if tok.AccessToken != "tt-access" || tok.RefreshToken != "tt-refresh" || tok.PlatformUserID != "tt-open-id-1" {
		t.Errorf("unexpected token: %+v", tok)
	}
}

func TestTikTokExchangePropagatesPlatformError(t *testing.T) {
	tokenServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// TikTok liefert Fehler oft mit Status 200, Fehlerfeldern im Body.
		w.Header().Set("Content-Type", "application/json")
		w.Write([]byte(`{"error":"invalid_grant","error_description":"code abgelaufen"}`))
	}))
	defer tokenServer.Close()

	c := NewTikTokConnector("client-key-123", "secret", "https://app.deklarix.de/oauth/tiktok/callback")
	c.TokenURL = tokenServer.URL

	_, err := c.Exchange(context.Background(), "abgelaufener-code")
	if err == nil {
		t.Fatal("expected an error when the platform response contains an error field")
	}
	if !strings.Contains(err.Error(), "invalid_grant") {
		t.Errorf("error = %v, want it to mention invalid_grant", err)
	}
}