import { InteractionManager } from 'react-native';
import semver from 'semver';

import reduxStore from '../createStore';
import database from '../realm';
import log from '../../utils/log';

const getUpdatedSince = () => {
	const emoji = database.objects('customEmojis').sorted('_updatedAt', true)[0];
	return emoji && emoji._updatedAt.toISOString();
};

const create = (customEmojis) => {
	if (customEmojis && customEmojis.length) {
		customEmojis.forEach((emoji) => {
			try {
				database.create('customEmojis', emoji, true);
			} catch (e) {
				// log('getEmojis create', e);
			}
		});
	}
};


export default function() {
	return new Promise(async(resolve) => {
		try {
			const serverVersion = reduxStore.getState().server.version;
			const updatedSince = getUpdatedSince();

			// if server version is lower than 0.75.0, fetches from old api
			if (semver.lt(serverVersion, '0.75.0')) {
				// RC 0.61.0
				const result = await this.sdk.get('emoji-custom');

				InteractionManager.runAfterInteractions(() => {
					let { emojis } = result;
					emojis = emojis.filter(emoji => !updatedSince || emoji._updatedAt > updatedSince);
					database.write(() => {
						create(emojis);
					});
					return resolve();
				});
			} else {
				const params = {};
				if (updatedSince) {
					params.updatedSince = updatedSince;
				}

				// RC 0.75.0
				const result = await this.sdk.get('emoji-custom.list', params);

				if (!result.success) {
					return resolve();
				}

				InteractionManager.runAfterInteractions(
					() => database.write(() => {
						const { emojis } = result;
						create(emojis.update);

						if (emojis.delete && emojis.delete.length) {
							emojis.delete.forEach((emoji) => {
								try {
									const emojiRecord = database.objectForPrimaryKey('customEmojis', emoji._id);
									if (emojiRecord) {
										database.delete(emojiRecord);
									}
								} catch (e) {
									log(e);
								}
							});
						}
						return resolve();
					})
				);
			}
		} catch (e) {
			log(e);
			return resolve();
		}
	});
}