import {
	ENotificationType as ENotificationTypeOriginal,
	INotification,
	IUserNotifications as IUserNotificationsResponse,
} from 'rettiwt-core';

import { findKeyByValue } from '../../helper/JsonUtils';

/**
 * The different types of notifications.
 *
 * @public
 */
export enum ENotificationType {
	RECOMMENDATION = 'RECOMMENDATION',
	INFORMATION = 'INFORMATION',
	LIVE = 'LIVE',
	ALERT = 'ALERT',
	UNDEFINED = 'UNDEFINED',
}

/**
 * The details of a single notification.
 *
 * @public
 */
export class Notification {
	/** The list of id of the users from whom the notification was received. */
	public from: string[];

	/** The id of the notification. */
	public id: string;

	/** The text contents of the notification. */
	public message: string;

	/** The date/time at which the notification was received. */
	public receivedAt: Date;

	/** The list of id of the target tweet(s) of the notification. */
	public target: string[];

	/** The type of notification. */
	public type?: ENotificationType;

	/**
	 * @param notification - The raw notification details.
	 */
	public constructor(notification: INotification) {
		// Getting the original notification type
		const notificationType: string | undefined = findKeyByValue(ENotificationTypeOriginal, notification.icon.id);

		this.from = notification.template?.aggregateUserActionsV1?.fromUsers
			? notification.template.aggregateUserActionsV1.fromUsers.map((item) => item.user.id)
			: [];
		this.id = notification.id;
		this.message = notification.message.text;
		this.receivedAt = new Date(Number(notification.timestampMs));
		this.target = notification.template?.aggregateUserActionsV1?.targetObjects
			? notification.template.aggregateUserActionsV1.targetObjects.map((item) => item.tweet.id)
			: [];
		this.type = notificationType
			? ENotificationType[notificationType as keyof typeof ENotificationType]
			: ENotificationType.UNDEFINED;
	}

	/**
	 * Extracts and deserializes the list of notifications from the given raw response data.
	 *
	 * @param response - The raw response data.
	 *
	 * @returns The deserialized list of notifications.
	 *
	 * @internal
	 */
	public static list(response: NonNullable<unknown>): Notification[] {
		const notifications: Notification[] = [];

		// Extracting notifications
		if ((response as IUserNotificationsResponse).globalObjects.notifications) {
			// Iterating over the raw list of notifications
			for (const [, value] of Object.entries(
				(response as IUserNotificationsResponse).globalObjects.notifications,
			)) {
				notifications.push(new Notification(value as INotification));
			}
		}

		return notifications;
	}
}