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import { readingQueueApi } from '@common/api/readingQueueApi';
import { NewsletterWithRelations, ReadingQueueItem } from '@common/types';
import { logger } from '@common/utils/logger';
import { BaseService } from '../base/BaseService';
export interface ReadingQueueOperationResult {
success: boolean;
item?: ReadingQueueItem;
newsletter?: NewsletterWithRelations;
error?: string;
}
export interface BulkReadingQueueOperationResult {
success: boolean;
processedCount: number;
failedCount: number;
errors: Array<{ id: string; error: string }>;
}
export interface ReadingQueueStats {
totalItems: number;
unreadItems: number;
averageReadTime: number;
oldestItem?: ReadingQueueItem;
estimatedReadTime: number;
}
export interface ReadingQueueServiceOptions {
maxQueueSize?: number;
autoRemoveRead?: boolean;
priorityOrdering?: boolean;
}
export class ReadingQueueService extends BaseService {
private queueOptions: ReadingQueueServiceOptions;
constructor(options: ReadingQueueServiceOptions = {}) {
super({
retryOptions: {
maxRetries: 3,
baseDelay: 1000,
},
timeout: 30000,
});
this.queueOptions = {
maxQueueSize: 100,
autoRemoveRead: true,
priorityOrdering: true,
...options,
};
}
/**
* Get all items in reading queue
*/
async getReadingQueue(): Promise<ReadingQueueItem[]> {
return this.executeWithLogging(async () => {
const items = await this.withRetry(() => readingQueueApi.getAll(), 'getReadingQueue');
// Apply business logic for ordering
return this.applyQueueOrdering(items);
}, 'getReadingQueue');
}
/**
* Get reading queue with full newsletter details
*/
async getReadingQueueWithDetails(): Promise<NewsletterWithRelations[]> {
return this.executeWithLogging(async () => {
const queueItems = await this.getReadingQueue();
const newsletters: NewsletterWithRelations[] = [];
// Fetch newsletter details for each queue item
for (const item of queueItems) {
try {
const newsletter = await newsletterApi.getById(item.newsletter_id);
if (newsletter) {
newsletters.push(newsletter);
}
} catch (error) {
logger.warn(
'Failed to fetch newsletter details for queue item',
{
component: 'ReadingQueueService',
action: 'get_queue_with_details',
metadata: { newsletterId: item.newsletter_id },
},
error instanceof Error ? error : new Error(String(error))
);
}
}
return newsletters;
}, 'getReadingQueueWithDetails');
}
/**
* Add newsletter to reading queue
*/
async addToQueue(newsletterId: string): Promise<ReadingQueueOperationResult> {
this.validateString(newsletterId, 'newsletter ID', { minLength: 1 });
return this.executeWithLogging(
async () => {
try {
// Validate newsletter exists and is not archived
const newsletter = await newsletterApi.getById(newsletterId);
if (!newsletter) {
return {
success: false,
error: 'Newsletter not found',
};
}
if (newsletter.is_archived) {
return {
success: false,
error: 'Cannot add archived newsletter to reading queue',
};
}
// Check if already in queue
const existingItems = await readingQueueApi.getAll();
const alreadyInQueue = existingItems.find((item) => item.newsletter_id === newsletterId);
if (alreadyInQueue) {
return {
success: false,
error: 'Newsletter is already in reading queue',
};
}
// Check queue size limit
if (existingItems.length >= this.queueOptions.maxQueueSize!) {
return {
success: false,
error: `Reading queue is full (maximum ${this.queueOptions.maxQueueSize} items)`,
};
}
const newItem = await this.withRetry(
() => readingQueueApi.add(newsletterId),
'addToQueue'
);
return {
success: true,
item: newItem,
newsletter,
};
} catch (error) {
return {
success: false,
error: error instanceof Error ? error.message : 'Unknown error',
};
}
},
'addToQueue',
{ newsletterId }
);
}
/**
* Remove newsletter from reading queue
*/
async removeFromQueue(newsletterId: string): Promise<ReadingQueueOperationResult> {
this.validateString(newsletterId, 'newsletter ID', { minLength: 1 });
return this.executeWithLogging(
async () => {
try {
// Check if item exists in queue
const existingItems = await readingQueueApi.getAll();
const queueItem = existingItems.find((item) => item.newsletter_id === newsletterId);
if (!queueItem) {
return {
success: false,
error: 'Newsletter is not in reading queue',
};
}
const success = await this.withRetry(
() => readingQueueApi.remove(queueItem.id),
'removeFromQueue'
);
if (!success) {
return {
success: false,
error: 'Failed to remove newsletter from reading queue',
};
}
return {
success: true,
item: queueItem,
};
} catch (error) {
return {
success: false,
error: error instanceof Error ? error.message : 'Unknown error',
};
}
},
'removeFromQueue',
{ newsletterId }
);
}
/**
* Bulk add newsletters to reading queue
*/
async bulkAddToQueue(newsletterIds: string[]): Promise<BulkReadingQueueOperationResult> {
this.validateArray(newsletterIds, 'newsletter IDs', { minLength: 1 });
return this.executeWithLogging(
async () => {
const results: Array<{ id: string; success: boolean; error?: string }> = [];
for (const newsletterId of newsletterIds) {
try {
const result = await this.addToQueue(newsletterId);
results.push({
id: newsletterId,
success: result.success,
error: result.error,
});
} catch (error) {
results.push({
id: newsletterId,
success: false,
error: error instanceof Error ? error.message : 'Unknown error',
});
}
}
const processedCount = results.filter((r) => r.success).length;
const failedCount = results.length - processedCount;
const errors = results
.filter((r) => !r.success)
.map((r) => ({ id: r.id, error: r.error || 'Unknown error' }));
return {
success: failedCount === 0,
processedCount,
failedCount,
errors,
};
},
'bulkAddToQueue',
{ count: newsletterIds.length }
);
}
/**
* Bulk remove newsletters from reading queue
*/
async bulkRemoveFromQueue(newsletterIds: string[]): Promise<BulkReadingQueueOperationResult> {
this.validateArray(newsletterIds, 'newsletter IDs', { minLength: 1 });
return this.executeWithLogging(
async () => {
const results: Array<{ id: string; success: boolean; error?: string }> = [];
for (const newsletterId of newsletterIds) {
try {
const result = await this.removeFromQueue(newsletterId);
results.push({
id: newsletterId,
success: result.success,
error: result.error,
});
} catch (error) {
results.push({
id: newsletterId,
success: false,
error: error instanceof Error ? error.message : 'Unknown error',
});
}
}
const processedCount = results.filter((r) => r.success).length;
const failedCount = results.length - processedCount;
const errors = results
.filter((r) => !r.success)
.map((r) => ({ id: r.id, error: r.error || 'Unknown error' }));
return {
success: failedCount === 0,
processedCount,
failedCount,
errors,
};
},
'bulkRemoveFromQueue',
{ count: newsletterIds.length }
);
}
/**
* Clear all items from reading queue
*/
async clearQueue(): Promise<ReadingQueueOperationResult> {
return this.executeWithLogging(async () => {
try {
const existingItems = await readingQueueApi.getAll();
if (existingItems.length === 0) {
return {
success: true,
error: 'Reading queue is already empty',
};
}
const success = await this.withRetry(() => readingQueueApi.clear(), 'clearQueue');
if (!success) {
return {
success: false,
error: 'Failed to clear reading queue',
};
}
return { success: true };
} catch (error) {
return {
success: false,
error: error instanceof Error ? error.message : 'Unknown error',
};
}
}, 'clearQueue');
}
/**
* Reorder reading queue items
*/
async reorderQueue(orderedNewsletterIds: string[]): Promise<ReadingQueueOperationResult> {
this.validateArray(orderedNewsletterIds, 'ordered newsletter IDs', {
minLength: 1,
});
return this.executeWithLogging(
async () => {
try {
// Validate all newsletters are in the queue
const existingItems = await readingQueueApi.getAll();
const existingIds = new Set(existingItems.map((item) => item.newsletter_id));
for (const newsletterId of orderedNewsletterIds) {
if (!existingIds.has(newsletterId)) {
return {
success: false,
error: `Newsletter ${newsletterId} not found in reading queue`,
};
}
}
// Create the reorder updates with positions
const reorderUpdates = orderedNewsletterIds.map((newsletterId, index) => {
const item = existingItems.find((item) => item.newsletter_id === newsletterId);
return {
id: item!.id,
position: index + 1,
};
});
const success = await this.withRetry(
() => readingQueueApi.reorder(reorderUpdates),
'reorderQueue'
);
if (!success) {
return {
success: false,
error: 'Failed to reorder reading queue',
};
}
return { success: true };
} catch (error) {
return {
success: false,
error: error instanceof Error ? error.message : 'Unknown error',
};
}
},
'reorderQueue',
{ count: orderedNewsletterIds.length }
);
}
/**
* Get reading queue statistics
*/
async getQueueStats(): Promise<ReadingQueueStats> {
return this.executeWithLogging(async () => {
const items = await this.getReadingQueue();
const newsletters = await this.getReadingQueueWithDetails();
const unreadItems = newsletters.filter((n) => !n.is_read).length;
const totalEstimatedTime = newsletters.reduce(
(sum, n) => sum + (n.estimated_read_time || 5),
0
);
const averageReadTime =
newsletters.length > 0 ? Math.round(totalEstimatedTime / newsletters.length) : 0;
const oldestItem =
items.length > 0
? items.sort((a, b) => new Date(a.added_at).getTime() - new Date(b.added_at).getTime())[0]
: undefined;
return {
totalItems: items.length,
unreadItems,
averageReadTime,
oldestItem,
estimatedReadTime: totalEstimatedTime,
};
}, 'getQueueStats');
}
/**
* Auto-cleanup reading queue (remove read newsletters if enabled)
*/
async autoCleanup(): Promise<BulkReadingQueueOperationResult> {
if (!this.queueOptions.autoRemoveRead) {
return {
success: true,
processedCount: 0,
failedCount: 0,
errors: [],
};
}
return this.executeWithLogging(async () => {
const newsletters = await this.getReadingQueueWithDetails();
const readNewsletterIds = newsletters.filter((n) => n.is_read).map((n) => n.id);
if (readNewsletterIds.length === 0) {
return {
success: true,
processedCount: 0,
failedCount: 0,
errors: [],
};
}
return await this.bulkRemoveFromQueue(readNewsletterIds);
}, 'autoCleanup');
}
/**
* Check if newsletter is in reading queue
*/
async isInQueue(newsletterId: string): Promise<boolean> {
this.validateString(newsletterId, 'newsletter ID', { minLength: 1 });
return this.executeWithLogging(
async () => {
// Use the efficient API method that only queries for the specific newsletter
return await readingQueueApi.isInQueue(newsletterId);
},
'isInQueue',
{ newsletterId }
);
}
/**
* Private helper methods
*/
private applyQueueOrdering(items: ReadingQueueItem[]): ReadingQueueItem[] {
if (!this.queueOptions.priorityOrdering) {
return items;
}
// Apply business logic for queue ordering
// Priority: creation date (older items first), then priority if available
return items.sort((a, b) => {
// First sort by creation date (oldest first)
const dateComparison = new Date(a.added_at).getTime() - new Date(b.added_at).getTime();
// Future: Add priority field to ReadingQueueItem and sort by priority
// if (a.priority !== b.priority) {
// return (b.priority || 0) - (a.priority || 0);
// }
return dateComparison;
});
}
/**
* Alias methods for backward compatibility
*/
// Alias for getReadingQueue
async getAll(): Promise<ReadingQueueItem[]> {
return this.getReadingQueue();
}
// Alias for addToQueue
async add(newsletterId: string): Promise<boolean> {
const result = await this.addToQueue(newsletterId);
return result.success;
}
// Alias for removeFromQueue
async remove(queueItemId: string): Promise<boolean> {
// Find the newsletter ID from the queue item ID
const existingItems = await readingQueueApi.getAll();
const item = existingItems.find((item) => item.id === queueItemId);
if (!item) {
return false;
}
const result = await this.removeFromQueue(item.newsletter_id);
return result.success;
}
// Alias for clearQueue
async clear(): Promise<boolean> {
const result = await this.clearQueue();
return result.success;
}
// Alias for reorderQueue
async reorder(updates: { id: string; position: number }[]): Promise<boolean> {
// Find the queue items and get their newsletter IDs
const existingItems = await readingQueueApi.getAll();
const orderedNewsletterIds = updates
.sort((a, b) => a.position - b.position)
.map((update) => {
const item = existingItems.find((item) => item.id === update.id);
return item?.newsletter_id;
})
.filter(Boolean) as string[];
const result = await this.reorderQueue(orderedNewsletterIds);
return result.success;
}
// Method for cleaning up orphaned items
async cleanupOrphanedItems(): Promise<{ removedCount: number }> {
const result = await this.autoCleanup();
return { removedCount: result.processedCount };
}
}
// Export singleton instance
export const readingQueueService = new ReadingQueueService();
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