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// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
import AppDispatcher from 'dispatcher/app_dispatcher.jsx';
import Constants from 'utils/constants.jsx';
import EventEmitter from 'events';
import * as Emoji from 'utils/emoji.jsx';
import store from 'stores/redux_store.jsx';
import {getCustomEmojisByName} from 'mattermost-redux/selectors/entities/emojis';
import {Client4} from 'mattermost-redux/client';
const ActionTypes = Constants.ActionTypes;
const CHANGE_EVENT = 'changed';
const MAXIMUM_RECENT_EMOJI = 27;
// Wrap the contents of the store so that we don't need to construct an ES6 map where most of the content
// (the system emojis) will never change. It provides the get/has functions of a map and an iterator so
// that it can be used in for..of loops
export class EmojiMap {
constructor(customEmojis) {
this.customEmojis = customEmojis;
// Store customEmojis to an array so we can iterate it more easily
this.customEmojisArray = [...customEmojis];
}
has(name) {
return Emoji.EmojiIndicesByAlias.has(name) || this.customEmojis.has(name);
}
get(name) {
if (Emoji.EmojiIndicesByAlias.has(name)) {
return Emoji.Emojis[Emoji.EmojiIndicesByAlias.get(name)];
}
return this.customEmojis.get(name);
}
[Symbol.iterator]() {
const customEmojisArray = this.customEmojisArray;
return {
systemIndex: 0,
customIndex: 0,
next() {
if (this.systemIndex < Emoji.Emojis.length) {
const emoji = Emoji.Emojis[this.systemIndex];
this.systemIndex += 1;
return {value: [emoji.aliases[0], emoji]};
}
if (this.customIndex < customEmojisArray.length) {
const emoji = customEmojisArray[this.customIndex][1];
this.customIndex += 1;
return {value: [emoji.name, emoji]};
}
return {done: true};
}
};
}
}
class EmojiStore extends EventEmitter {
constructor() {
super();
this.dispatchToken = AppDispatcher.register(this.handleEventPayload.bind(this));
this.setMaxListeners(600);
this.map = new EmojiMap(getCustomEmojisByName(store.getState()));
this.entities = {};
store.subscribe(() => {
const newEntities = store.getState().entities.emojis.customEmoji;
if (newEntities !== this.entities) {
this.map = new EmojiMap(getCustomEmojisByName(store.getState()));
this.emitChange();
}
this.entities = newEntities;
});
}
addChangeListener(callback) {
this.on(CHANGE_EVENT, callback);
}
removeChangeListener(callback) {
this.removeListener(CHANGE_EVENT, callback);
}
emitChange() {
this.emit(CHANGE_EVENT);
}
hasSystemEmoji(name) {
return Emoji.EmojiIndicesByAlias.has(name);
}
getCustomEmojiMap() {
return getCustomEmojisByName(store.getState());
}
getEmojis() {
return this.map;
}
has(name) {
return this.map.has(name);
}
get(name) {
return this.map.get(name);
}
addRecentEmoji(alias) {
const recentEmojis = this.getRecentEmojis();
let name;
const emoji = this.get(alias);
if (!emoji) {
return;
} else if (emoji.name) {
name = emoji.name;
} else {
name = emoji.aliases[0];
}
const index = recentEmojis.indexOf(name);
if (index !== -1) {
recentEmojis.splice(index, 1);
}
recentEmojis.push(name);
if (recentEmojis.length > MAXIMUM_RECENT_EMOJI) {
recentEmojis.splice(0, recentEmojis.length - MAXIMUM_RECENT_EMOJI);
}
localStorage.setItem(Constants.RECENT_EMOJI_KEY, JSON.stringify(recentEmojis));
}
getRecentEmojis() {
let recentEmojis;
try {
recentEmojis = JSON.parse(localStorage.getItem(Constants.RECENT_EMOJI_KEY));
} catch (e) {
// Errors are handled below
}
if (!recentEmojis) {
return [];
}
if (recentEmojis.length > 0 && typeof recentEmojis[0] === 'object') {
// Prior to PLT-7267, recent emojis were stored with the entire object for the emoji, but this
// has been changed to store only the names of the emojis, so we need to change that
recentEmojis = recentEmojis.map((emoji) => {
return emoji.name || emoji.aliases[0];
});
}
return recentEmojis;
}
hasUnicode(codepoint) {
return Emoji.EmojiIndicesByUnicode.has(codepoint);
}
getUnicode(codepoint) {
return Emoji.Emojis[Emoji.EmojiIndicesByUnicode.get(codepoint)];
}
getEmojiImageUrl(emoji) {
if (emoji.id) {
return Client4.getUrlVersion() + '/emoji/' + emoji.id + '/image';
}
const filename = emoji.filename || emoji.aliases[0];
return Constants.EMOJI_PATH + '/' + filename + '.png';
}
handleEventPayload(payload) {
const action = payload.action;
switch (action.type) {
case ActionTypes.EMOJI_POSTED:
this.addRecentEmoji(action.alias);
this.emitChange();
break;
}
}
}
export default new EmojiStore();
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