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* EventReminderManager - Handles reminder scheduling and timing logic
*
* Implements a dynamic scheduling system that calculates exact reminder times
* instead of constantly polling for events. This approach significantly reduces
* resource usage while ensuring precise timing for event notifications.
*
* Architecture benefits:
* - Dynamic scheduling eliminates wasteful constant polling
* - Precise timing ensures reminders are sent exactly when needed
* - Automatic rescheduling when new events are added
* - Graceful handling of system restarts and clock changes
*/
class EventReminderManager {
constructor(bot, storage) {
this.bot = bot;
this.storage = storage;
// Get environment-specific reminder intervals from bot configuration
this.reminderIntervals = this.bot.getReminderIntervals();
if (!this.reminderIntervals) {
throw new Error('Reminder intervals not configured in bot');
}
// Timer references for cleanup
this.reminderTimer = null;
this.initialCheckTimer = null;
this.nextReminderTimeout = null;
console.log(`EventReminderManager initialized with intervals: ${this.reminderIntervals.weekReminder/60000}min, ${this.reminderIntervals.dayReminder/60000}min`);
}
/**
* Start the dynamic reminder system - schedules next reminder precisely
*/
startReminderChecker() {
console.log('Starting dynamic reminder system...');
// Delay initial check to allow bot components to fully initialize
// This prevents race conditions during startup where dependencies might not be ready
this.initialCheckTimer = setTimeout(() => {
this.scheduleNextReminder();
}, 10000); // 10 seconds startup delay
console.log('Dynamic reminder system started');
}
/**
* Schedule the next reminder based on actual event timing
*/
async scheduleNextReminder() {
try {
const guildId = this.bot.getGuildId();
const upcomingEvents = await this.storage.getUpcomingEvents(guildId);
if (upcomingEvents.length === 0) {
console.log('🔔 No upcoming events - scheduling check in 1 hour');
this.nextReminderTimeout = setTimeout(() => this.scheduleNextReminder(), 60 * 60 * 1000);
return;
}
let nextReminderTime = null;
let targetEvent = null;
// Find the next reminder that needs to be sent
for (const event of upcomingEvents) {
const eventDate = new Date(event.event_date);
const createdDate = new Date(event.created_at);
const now = new Date();
// Check when this event's reminders should be sent
const weekReminderTime = new Date(eventDate.getTime() - this.reminderIntervals.weekReminder);
const dayReminderTime = new Date(eventDate.getTime() - this.reminderIntervals.dayReminder);
if (event.reminder_status === 'pending' && now >= weekReminderTime) {
// Week reminder is due now
nextReminderTime = now;
targetEvent = event;
break;
} else Iif (event.reminder_status === 'week_sent' && now >= dayReminderTime) {
// Day reminder is due now
nextReminderTime = now;
targetEvent = event;
break;
} else Iif (event.reminder_status === 'pending' && weekReminderTime > now) {
// Week reminder is due in the future
if (!nextReminderTime || weekReminderTime < nextReminderTime) {
nextReminderTime = weekReminderTime;
targetEvent = event;
}
} else Iif (event.reminder_status === 'week_sent' && dayReminderTime > now) {
// Day reminder is due in the future
if (!nextReminderTime || dayReminderTime < nextReminderTime) {
nextReminderTime = dayReminderTime;
targetEvent = event;
}
}
}
if (nextReminderTime && targetEvent) {
const msUntilReminder = Math.max(0, nextReminderTime.getTime() - Date.now());
Iif (msUntilReminder === 0) {
// Send reminder now and reschedule
console.log(`🔔 Sending immediate reminder for: ${targetEvent.name}`);
await this.processEventReminder(targetEvent);
this.scheduleNextReminder(); // Reschedule immediately
} else {
// Schedule reminder for exact time
console.log(`🔔 Next reminder scheduled in ${Math.round(msUntilReminder/1000)}s for: ${targetEvent.name}`);
this.nextReminderTimeout = setTimeout(() => {
this.processEventReminder(targetEvent).then(() => {
this.scheduleNextReminder(); // Reschedule after sending
});
}, msUntilReminder);
}
} else {
// No upcoming reminders, check again in 1 hour
console.log('🔔 No upcoming reminders - checking again in 1 hour');
this.nextReminderTimeout = setTimeout(() => this.scheduleNextReminder(), 60 * 60 * 1000);
}
} catch (error) {
console.error('Error scheduling next reminder:', error);
// Fallback to checking again in 5 minutes
this.nextReminderTimeout = setTimeout(() => this.scheduleNextReminder(), 5 * 60 * 1000);
}
}
/**
* Reschedule reminders after new events are added
*/
rescheduleReminders() {
// Cancel current schedule and recalculate
Iif (this.nextReminderTimeout) {
clearTimeout(this.nextReminderTimeout);
this.nextReminderTimeout = null;
}
// Schedule immediately
setImmediate(() => this.scheduleNextReminder());
}
/**
* Process reminder for a specific event (called by dynamic scheduler)
*/
async processEventReminder(event) {
try {
const now = new Date();
const eventDate = new Date(event.event_date);
const timeUntilEvent = eventDate.getTime() - now.getTime();
let reminderType = '';
let newStatus = event.reminder_status;
let reminderIntervalMs = 0;
// Determine which reminder to send based on current status
if (event.reminder_status === 'pending') {
// Send first reminder
reminderType = 'week';
reminderIntervalMs = this.reminderIntervals.weekReminder;
newStatus = 'week_sent';
} else if (event.reminder_status === 'week_sent') {
// Send second reminder
reminderType = 'day';
reminderIntervalMs = this.reminderIntervals.dayReminder;
newStatus = 'day_sent';
} else {
// Already sent all reminders
return;
}
console.log(`📅 Sending ${reminderType} reminder for event: ${event.name}`);
// Send reminder through notification manager
await this.bot.eventManager.notificationManager.sendEventReminder(event, reminderType, reminderIntervalMs, false);
await this.storage.updateReminderStatus(event.guild_id, event.event_id, newStatus);
} catch (error) {
console.error(`Error processing reminder for event ${event.event_id}:`, error);
}
}
/**
* Convert milliseconds to human readable time text
*/
formatIntervalTime(intervalMs, isAfterCreation = false) {
const absInterval = Math.abs(intervalMs);
// Convert to different units
const seconds = Math.floor(absInterval / 1000);
const minutes = Math.floor(seconds / 60);
const hours = Math.floor(minutes / 60);
const days = Math.floor(hours / 24);
// Format based on largest unit
let timeText = '';
if (days > 0) {
timeText = `${days} day${days !== 1 ? 's' : ''}`;
} else if (hours > 0) {
timeText = `${hours} hour${hours !== 1 ? 's' : ''}`;
} else if (minutes > 0) {
timeText = `${minutes} min${minutes !== 1 ? 's' : ''}`;
} else {
timeText = `${seconds} sec${seconds !== 1 ? 's' : ''}`;
}
// Add context for when the reminder is sent
if (isAfterCreation) {
return `${timeText} after creation`;
} else {
return `${timeText} before event`;
}
}
/**
* Cleanup timers - call this during shutdown or in tests
*/
cleanup() {
Iif (this.reminderTimer) {
clearInterval(this.reminderTimer);
this.reminderTimer = null;
}
if (this.initialCheckTimer) {
clearTimeout(this.initialCheckTimer);
this.initialCheckTimer = null;
}
if (this.nextReminderTimeout) {
clearTimeout(this.nextReminderTimeout);
this.nextReminderTimeout = null;
}
console.log('EventReminderManager timers cleaned up');
}
}
module.exports = EventReminderManager; |