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message-forward-collection.ts
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message-forward-collection.ts
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/* eslint-disable max-classes-per-file */
import { MessageContext } from '../contexts/message';
import { ContextDefaultState } from '../contexts/context';
import { Attachment, ExternalAttachment } from '../attachments';
import { AttachmentTypeString } from '../../utils/constants';
import { Attachmentable } from './attachmentable';
import { applyMixins } from '../../utils/helpers';
const getForwards = <S = ContextDefaultState>(rootForwards: MessageContext<S>[]): MessageContext<S>[] => {
const forwards: MessageContext<S>[] = [];
for (const forward of rootForwards) {
forwards.push(
forward,
...getForwards<S>(forward.forwards),
);
}
return forwards;
};
const kFlatten = Symbol('flatten');
// eslint-disable-next-line @typescript-eslint/no-unsafe-declaration-merging
class MessageForwardsCollection<S = ContextDefaultState> extends Array<MessageContext<S>> {
protected [kFlatten]?: MessageContext<S>[];
/**
* Returns a flat copy of forwards
*/
public get flatten(): MessageContext<S>[] {
if (!this[kFlatten]) {
this[kFlatten] = getForwards(this);
}
return this[kFlatten]!;
}
}
// eslint-disable-next-line
interface MessageForwardsCollection extends Attachmentable {}
applyMixins(MessageForwardsCollection, [
class CustomAttachmentable {
public flatten!: MessageContext[];
public hasAttachments(type?: AttachmentTypeString): boolean {
return this.flatten.some(forward => (
forward.hasAttachments(type)
));
}
public getAttachments(
type?: AttachmentTypeString,
): (Attachment | ExternalAttachment)[] {
const attachments = this.flatten.map(forward => (
// @ts-expect-error too annoying for overload types
forward.getAttachments(type)
));
return ([] as (Attachment | ExternalAttachment)[]).concat(...attachments);
}
},
]);
export { MessageForwardsCollection };