1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
package api
import (
"context"
"fmt"
"log"
"sort"
"strings"
"time"
"task-dashboard/internal/models"
"google.golang.org/api/calendar/v3"
"google.golang.org/api/option"
)
type GoogleCalendarClient struct {
srv *calendar.Service
calendarIDs []string
displayTZ *time.Location
}
// parseEventTime extracts start/end times from a Google Calendar event
func (c *GoogleCalendarClient) parseEventTime(item *calendar.Event) (start, end time.Time) {
displayTZ := c.displayTZ
if displayTZ == nil {
displayTZ = time.UTC
}
if item.Start.DateTime == "" {
// All-day event - parse in display timezone
start, _ = time.ParseInLocation("2006-01-02", item.Start.Date, displayTZ)
end, _ = time.ParseInLocation("2006-01-02", item.End.Date, displayTZ)
} else {
// Try RFC3339 first (includes timezone offset like "2006-01-02T15:04:05-10:00" or "Z")
var err error
start, err = time.Parse(time.RFC3339, item.Start.DateTime)
if err != nil {
// No timezone in string - use event's timezone or display timezone
var loc *time.Location
if item.Start.TimeZone != "" {
loc, _ = time.LoadLocation(item.Start.TimeZone)
}
if loc == nil {
loc = displayTZ
}
start, _ = time.ParseInLocation("2006-01-02T15:04:05", item.Start.DateTime, loc)
}
end, err = time.Parse(time.RFC3339, item.End.DateTime)
if err != nil {
var loc *time.Location
if item.End.TimeZone != "" {
loc, _ = time.LoadLocation(item.End.TimeZone)
}
if loc == nil {
loc = displayTZ
}
end, _ = time.ParseInLocation("2006-01-02T15:04:05", item.End.DateTime, loc)
}
// Convert to display timezone
start = start.In(displayTZ)
end = end.In(displayTZ)
}
return
}
// deduplicateEvents removes duplicate events (same summary + start time)
func deduplicateEvents(events []models.CalendarEvent) []models.CalendarEvent {
seen := make(map[string]bool)
var unique []models.CalendarEvent
for _, event := range events {
key := fmt.Sprintf("%s|%d", event.Summary, event.Start.Unix())
if !seen[key] {
seen[key] = true
unique = append(unique, event)
}
}
sort.Slice(unique, func(i, j int) bool {
return unique[i].Start.Before(unique[j].Start)
})
return unique
}
// NewGoogleCalendarClient creates a client that fetches from multiple calendars.
// calendarIDs can be comma-separated (e.g., "cal1@group.calendar.google.com,cal2@group.calendar.google.com")
// timezone is the IANA timezone name for display (e.g., "Pacific/Honolulu")
func NewGoogleCalendarClient(ctx context.Context, credentialsFile, calendarIDs, timezone string) (*GoogleCalendarClient, error) {
srv, err := calendar.NewService(ctx, option.WithCredentialsFile(credentialsFile))
if err != nil {
return nil, fmt.Errorf("unable to retrieve Calendar client: %v", err)
}
// Parse comma-separated calendar IDs
ids := strings.Split(calendarIDs, ",")
var trimmedIDs []string
for _, id := range ids {
if trimmed := strings.TrimSpace(id); trimmed != "" {
trimmedIDs = append(trimmedIDs, trimmed)
}
}
// Load display timezone
displayTZ, err := time.LoadLocation(timezone)
if err != nil {
log.Printf("Warning: invalid timezone %q, using UTC: %v", timezone, err)
displayTZ = time.UTC
}
return &GoogleCalendarClient{
srv: srv,
calendarIDs: trimmedIDs,
displayTZ: displayTZ,
}, nil
}
func (c *GoogleCalendarClient) GetUpcomingEvents(ctx context.Context, maxResults int) ([]models.CalendarEvent, error) {
t := time.Now().Format(time.RFC3339)
var allEvents []models.CalendarEvent
for _, calendarID := range c.calendarIDs {
events, err := c.srv.Events.List(calendarID).ShowDeleted(false).
SingleEvents(true).TimeMin(t).MaxResults(int64(maxResults)).OrderBy("startTime").Do()
if err != nil {
log.Printf("Warning: failed to fetch events from calendar %s: %v", calendarID, err)
continue
}
for _, item := range events.Items {
start, end := c.parseEventTime(item)
allEvents = append(allEvents, models.CalendarEvent{
ID: item.Id,
Summary: item.Summary,
Description: item.Description,
Start: start,
End: end,
HTMLLink: item.HtmlLink,
})
}
}
uniqueEvents := deduplicateEvents(allEvents)
if len(uniqueEvents) > maxResults {
uniqueEvents = uniqueEvents[:maxResults]
}
return uniqueEvents, nil
}
func (c *GoogleCalendarClient) GetEventsByDateRange(ctx context.Context, start, end time.Time) ([]models.CalendarEvent, error) {
timeMin := start.Format(time.RFC3339)
timeMax := end.Format(time.RFC3339)
var allEvents []models.CalendarEvent
for _, calendarID := range c.calendarIDs {
events, err := c.srv.Events.List(calendarID).ShowDeleted(false).
SingleEvents(true).TimeMin(timeMin).TimeMax(timeMax).OrderBy("startTime").Do()
if err != nil {
log.Printf("Warning: failed to fetch events from calendar %s: %v", calendarID, err)
continue
}
for _, item := range events.Items {
evtStart, evtEnd := c.parseEventTime(item)
allEvents = append(allEvents, models.CalendarEvent{
ID: item.Id,
Summary: item.Summary,
Description: item.Description,
Start: evtStart,
End: evtEnd,
HTMLLink: item.HtmlLink,
})
}
}
return deduplicateEvents(allEvents), nil
}
// GetCalendarList returns all calendars accessible to the user
func (c *GoogleCalendarClient) GetCalendarList(ctx context.Context) ([]models.CalendarInfo, error) {
list, err := c.srv.CalendarList.List().Do()
if err != nil {
return nil, fmt.Errorf("failed to fetch calendar list: %w", err)
}
var calendars []models.CalendarInfo
for _, item := range list.Items {
name := item.Summary
if name == "" {
name = item.Id
}
calendars = append(calendars, models.CalendarInfo{
ID: item.Id,
Name: name,
})
}
return calendars, nil
}
|
