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package api
import (
"context"
"encoding/json"
"net/http"
"net/http/httptest"
"strings"
"testing"
"time"
"task-dashboard/internal/models"
"google.golang.org/api/calendar/v3"
"google.golang.org/api/option"
)
// redirectingTransport rewrites all outgoing requests to a local test server,
// preserving the original path and query so the Google API library stays unaware.
type redirectingTransport struct {
server *httptest.Server
}
func (rt *redirectingTransport) RoundTrip(req *http.Request) (*http.Response, error) {
req2 := req.Clone(req.Context())
req2.URL.Scheme = "http"
req2.URL.Host = rt.server.Listener.Addr().String()
return http.DefaultTransport.RoundTrip(req2)
}
func newTestGoogleCalendarClient(t *testing.T, server *httptest.Server, calendarIDs []string, tz *time.Location) *GoogleCalendarClient {
t.Helper()
if tz == nil {
tz = time.UTC
}
httpClient := &http.Client{Transport: &redirectingTransport{server: server}}
srv, err := calendar.NewService(context.Background(),
option.WithHTTPClient(httpClient),
option.WithoutAuthentication(),
)
if err != nil {
t.Fatalf("failed to create test calendar service: %v", err)
}
return &GoogleCalendarClient{
srv: srv,
calendarIDs: calendarIDs,
displayTZ: tz,
}
}
// newCalendarClientWithTZ builds a minimal client for testing parseEventTime.
// No srv needed since parseEventTime is a pure transformation.
func newCalendarClientWithTZ(tz *time.Location) *GoogleCalendarClient {
if tz == nil {
tz = time.UTC
}
return &GoogleCalendarClient{displayTZ: tz}
}
// --- deduplicateEvents ---
func TestDeduplicateEvents_RemovesDuplicates(t *testing.T) {
start := time.Date(2026, 3, 17, 10, 0, 0, 0, time.UTC)
events := []models.CalendarEvent{
{ID: "event1", Summary: "Meeting", Start: start},
{ID: "event2", Summary: "Meeting", Start: start}, // same summary+start → duplicate
}
got := deduplicateEvents(events)
if len(got) != 1 {
t.Fatalf("expected 1 event, got %d", len(got))
}
// First occurrence is kept
if got[0].ID != "event1" {
t.Errorf("expected first occurrence kept (ID %q), got ID %q", "event1", got[0].ID)
}
}
func TestDeduplicateEvents_DifferentSummaryOrTimeNotDeduplicated(t *testing.T) {
t1 := time.Date(2026, 3, 17, 10, 0, 0, 0, time.UTC)
t2 := time.Date(2026, 3, 17, 11, 0, 0, 0, time.UTC)
events := []models.CalendarEvent{
{ID: "a", Summary: "Meeting", Start: t1},
{ID: "b", Summary: "Lunch", Start: t1}, // different summary
{ID: "c", Summary: "Meeting", Start: t2}, // different start time
}
got := deduplicateEvents(events)
if len(got) != 3 {
t.Fatalf("expected 3 events, got %d", len(got))
}
}
func TestDeduplicateEvents_SortsByStartTime(t *testing.T) {
later := time.Date(2026, 3, 17, 9, 0, 0, 0, time.UTC)
earlier := time.Date(2026, 3, 17, 8, 0, 0, 0, time.UTC)
events := []models.CalendarEvent{
{ID: "later", Summary: "Later", Start: later},
{ID: "earlier", Summary: "Earlier", Start: earlier},
}
got := deduplicateEvents(events)
if len(got) != 2 {
t.Fatalf("expected 2 events, got %d", len(got))
}
if got[0].ID != "earlier" {
t.Errorf("expected earlier event first, got ID %q", got[0].ID)
}
if got[1].ID != "later" {
t.Errorf("expected later event second, got ID %q", got[1].ID)
}
}
func TestDeduplicateEvents_EmptyInput(t *testing.T) {
if got := deduplicateEvents(nil); len(got) != 0 {
t.Errorf("expected empty result for nil input, got %d events", len(got))
}
}
// --- parseEventTime ---
func TestParseEventTime_RFC3339DateTime(t *testing.T) {
c := newCalendarClientWithTZ(time.UTC)
item := &calendar.Event{
Start: &calendar.EventDateTime{DateTime: "2026-03-17T10:00:00-10:00"},
End: &calendar.EventDateTime{DateTime: "2026-03-17T11:00:00-10:00"},
}
start, end := c.parseEventTime(item)
// UTC-10 offset: 10:00 local = 20:00 UTC
wantStart := time.Date(2026, 3, 17, 20, 0, 0, 0, time.UTC)
wantEnd := time.Date(2026, 3, 17, 21, 0, 0, 0, time.UTC)
if !start.Equal(wantStart) {
t.Errorf("start: got %v, want %v", start, wantStart)
}
if !end.Equal(wantEnd) {
t.Errorf("end: got %v, want %v", end, wantEnd)
}
}
func TestParseEventTime_AllDayEvent(t *testing.T) {
tz, _ := time.LoadLocation("Pacific/Honolulu") // UTC-10
c := newCalendarClientWithTZ(tz)
item := &calendar.Event{
Start: &calendar.EventDateTime{Date: "2026-03-17"},
End: &calendar.EventDateTime{Date: "2026-03-18"},
}
start, end := c.parseEventTime(item)
wantStart := time.Date(2026, 3, 17, 0, 0, 0, 0, tz)
wantEnd := time.Date(2026, 3, 18, 0, 0, 0, 0, tz)
if !start.Equal(wantStart) {
t.Errorf("start: got %v, want %v", start, wantStart)
}
if !end.Equal(wantEnd) {
t.Errorf("end: got %v, want %v", end, wantEnd)
}
}
func TestParseEventTime_EmptyDateTime(t *testing.T) {
c := newCalendarClientWithTZ(time.UTC)
item := &calendar.Event{
Start: &calendar.EventDateTime{},
End: &calendar.EventDateTime{},
}
start, end := c.parseEventTime(item)
if !start.IsZero() {
t.Errorf("expected zero start time for empty event, got %v", start)
}
if !end.IsZero() {
t.Errorf("expected zero end time for empty event, got %v", end)
}
}
func TestParseEventTime_DateTimeWithoutTimezone_UsesEventTZ(t *testing.T) {
tz, _ := time.LoadLocation("America/New_York")
c := newCalendarClientWithTZ(tz)
item := &calendar.Event{
// DateTime without offset — library passes TimeZone alongside it
Start: &calendar.EventDateTime{DateTime: "2026-03-17T10:00:00", TimeZone: "America/New_York"},
End: &calendar.EventDateTime{DateTime: "2026-03-17T11:00:00", TimeZone: "America/New_York"},
}
start, end := c.parseEventTime(item)
wantStart := time.Date(2026, 3, 17, 10, 0, 0, 0, tz)
wantEnd := time.Date(2026, 3, 17, 11, 0, 0, 0, tz)
if !start.Equal(wantStart) {
t.Errorf("start: got %v, want %v", start, wantStart)
}
if !end.Equal(wantEnd) {
t.Errorf("end: got %v, want %v", end, wantEnd)
}
}
// --- GetUpcomingEvents ---
func calendarAPIResponse(items []map[string]interface{}) string {
b, _ := json.Marshal(map[string]interface{}{
"kind": "calendar#events",
"items": items,
})
return string(b)
}
func TestGetUpcomingEvents_NormalResponse(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if !strings.Contains(r.URL.Path, "/events") {
http.NotFound(w, r)
return
}
w.Header().Set("Content-Type", "application/json")
body := calendarAPIResponse([]map[string]interface{}{
{
"id": "event1",
"summary": "Team Meeting",
"htmlLink": "https://calendar.google.com/event?id=event1",
"start": map[string]string{"dateTime": "2026-03-17T10:00:00Z"},
"end": map[string]string{"dateTime": "2026-03-17T11:00:00Z"},
},
})
_, _ = w.Write([]byte(body))
}))
defer server.Close()
client := newTestGoogleCalendarClient(t, server, []string{"primary"}, time.UTC)
events, err := client.GetUpcomingEvents(context.Background(), 10)
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
if len(events) != 1 {
t.Fatalf("expected 1 event, got %d", len(events))
}
if events[0].Summary != "Team Meeting" {
t.Errorf("expected summary %q, got %q", "Team Meeting", events[0].Summary)
}
if events[0].ID != "event1" {
t.Errorf("expected ID %q, got %q", "event1", events[0].ID)
}
wantStart := time.Date(2026, 3, 17, 10, 0, 0, 0, time.UTC)
if !events[0].Start.Equal(wantStart) {
t.Errorf("start: got %v, want %v", events[0].Start, wantStart)
}
}
func TestGetUpcomingEvents_EmptyResponse(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
_, _ = w.Write([]byte(`{"kind":"calendar#events","items":[]}`))
}))
defer server.Close()
client := newTestGoogleCalendarClient(t, server, []string{"primary"}, time.UTC)
events, err := client.GetUpcomingEvents(context.Background(), 10)
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
if len(events) != 0 {
t.Errorf("expected 0 events, got %d", len(events))
}
}
func TestGetUpcomingEvents_APIError_ReturnsEmptyNotError(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
http.Error(w, "Internal Server Error", http.StatusInternalServerError)
}))
defer server.Close()
client := newTestGoogleCalendarClient(t, server, []string{"primary"}, time.UTC)
events, err := client.GetUpcomingEvents(context.Background(), 10)
// Calendar errors are logged and skipped — the function never returns an error.
if err != nil {
t.Fatalf("expected nil error on calendar fetch failure, got: %v", err)
}
if len(events) != 0 {
t.Errorf("expected 0 events on API error, got %d", len(events))
}
}
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