@hsaadawy/ngx-chat
Version:
54 lines • 9.05 kB
JavaScript
import { Subject } from 'rxjs';
import { Direction } from './message';
import { findLast, findSortedIndex, findSortedInsertionIndexLast, insertSortedLast } from './utils-array';
import { extractDateStringFromDate } from './utils-date';
export class MessageStore {
constructor(logService) {
this.logService = logService;
this.messages = [];
this.dateMessageGroups = [];
this.messageIdToMessage = new Map();
this.messages$ = new Subject();
}
addMessage(message) {
if (message.id && this.messageIdToMessage.has(message.id)) {
if (this.logService) {
this.logService.warn(`message with id ${message.id} already exists`);
}
return false;
}
insertSortedLast(message, this.messages, m => m.datetime);
this.addToDateMessageGroups(message);
this.messageIdToMessage.set(message.id, message);
this.messages$.next(message);
return true;
}
get oldestMessage() {
return this.messages[0];
}
get mostRecentMessage() {
return this.messages[this.messages.length - 1];
}
get mostRecentMessageReceived() {
return findLast(this.messages, msg => msg.direction === Direction.in);
}
get mostRecentMessageSent() {
return findLast(this.messages, msg => msg.direction === Direction.out);
}
addToDateMessageGroups(message) {
const dateString = extractDateStringFromDate(message.datetime);
const groupIndex = findSortedIndex(dateString, this.dateMessageGroups, group => extractDateStringFromDate(group.date));
if (groupIndex !== -1) {
insertSortedLast(message, this.dateMessageGroups[groupIndex].messages, m => m.datetime);
}
else {
const groupToInsert = {
date: message.datetime,
messages: [message]
};
const insertIndex = findSortedInsertionIndexLast(dateString, this.dateMessageGroups, group => extractDateStringFromDate(group.date));
this.dateMessageGroups.splice(insertIndex, 0, groupToInsert);
}
}
}
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