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calendar_utils.dart
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calendar_utils.dart
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import 'dart:collection';
import 'package:device_calendar/device_calendar.dart';
import 'package:ets_api_clients/models.dart';
mixin CalendarUtils {
static Future<bool> checkPermissions() async {
final deviceCalendarPluginPermissionsResponse =
await deviceCalendarPlugin.hasPermissions();
// if we were able to check for permissions without error
if (deviceCalendarPluginPermissionsResponse.isSuccess) {
// if the user has not yet allowed permission
if (deviceCalendarPluginPermissionsResponse.data != null &&
!deviceCalendarPluginPermissionsResponse.data!) {
// request permission
final deviceCalendarPluginRequestPermissionsResponse =
await deviceCalendarPlugin.requestPermissions();
// if permission request was successfully executed
if (deviceCalendarPluginRequestPermissionsResponse.isSuccess) {
// return the result of the permission request (accepted or refused)
return deviceCalendarPluginRequestPermissionsResponse.data!;
} else {
// Handle requesting permissions failure
}
} else {
// if user has allowed permission
return true;
}
} else {
// error requesting permissions
}
return false;
}
static final DeviceCalendarPlugin deviceCalendarPlugin =
DeviceCalendarPlugin();
static Future<UnmodifiableListView<Calendar>> get nativeCalendars async {
final Result<UnmodifiableListView<Calendar>> calendarFetchResult =
await DeviceCalendarPlugin().retrieveCalendars();
return calendarFetchResult.data!;
}
/// Fetches a calendar by name from the native calendar app
static Future<Calendar?> fetchNativeCalendar(String calendarName) async {
final nativeCalendarList = await nativeCalendars;
for (final calendar in nativeCalendarList) {
if (calendar.name == calendarName) {
return calendar;
}
}
return null;
}
/// Fetches events from a calendar by id from the native calendar app
static Future<UnmodifiableListView<Event>> fetchNativeCalendarEvents(
String calendarId, RetrieveEventsParams retrievalParams) async {
final output =
await deviceCalendarPlugin.retrieveEvents(calendarId, retrievalParams);
return output.data!;
}
static Future<bool> export(
List<CourseActivity> courses,
String calendarName,
) async {
final DeviceCalendarPlugin localDeviceCalendarPlugin =
DeviceCalendarPlugin();
// Request permissions
final bool calendarPermission = await checkPermissions();
if (!calendarPermission) {
return false;
}
courses.sort((a, b) => a.startDateTime.compareTo(b.startDateTime));
final DateTime startDate = courses.first.startDateTime;
final DateTime endDate = courses.last.endDateTime;
// Fetch calendar
Calendar? calendar = await fetchNativeCalendar(calendarName);
// Create calendar if it doesn't exist
if (calendar == null) {
await deviceCalendarPlugin.createCalendar(calendarName);
calendar = await fetchNativeCalendar(calendarName);
}
// Fetch events from calendar to avoid duplicates
final events = await fetchNativeCalendarEvents(
calendar!.id!,
RetrieveEventsParams(
startDate: startDate,
endDate: endDate,
));
// Order by date
courses.sort((a, b) => a.startDateTime.compareTo(b.startDateTime));
bool hasErrors = false;
// Add events to calendar
for (final course in courses) {
// create event
final event = Event(
calendar.id,
title: course.courseName,
start: TZDateTime.from(
course.startDateTime, getLocation('America/Toronto')),
end:
TZDateTime.from(course.endDateTime, getLocation('America/Toronto')),
location: course.activityLocation,
description:
"${course.courseGroup} \n${course.activityDescription}\n N'EFFACEZ PAS CETTE LIGNE: ${course.hashCode}",
);
final existingEvents = events.where(
(element) {
if (element.description != null &&
element.description!.contains(course.hashCode.toString())) {
return true;
}
return false;
},
);
if (existingEvents.isNotEmpty) {
final existingEvent = existingEvents.first;
// If already exists prepare for update
event.eventId = existingEvent.eventId;
}
// Create or update event
final result = await localDeviceCalendarPlugin.createOrUpdateEvent(
event,
);
if (result != null && !result.isSuccess) {
hasErrors = true;
}
}
return !hasErrors;
}
}