export class Messages {
	constructor() {
		this.channels = {};
	}

	inChannel(channel) {
		return this.channels[channel] || [];
	}

	addMessage(message) {
		let {
			channel,
			...payload
		} = message;
		let channel_id = channel.id;
		this.updateChannel(channel_id, (messages) => [...messages, payload]);
		return this;
	}

	addMessages(channel, payloads) {
		this.updateChannel(channel, (messages) => [...messages, ...payloads]);
		return this;
	}


	deleteMessage(channel, message) {
		let messages = this.messages(channel).filter((msg) => msg.message.id != message);
		this.channels[channel] = messages;
	}

	deleteChannel(id) {
		delete this.channels[id];
		return this;
	}

	updateChannel(channel, callback) {
		let messages = callback(this.inChannel(channel));
		messages.sort((a, b) => a.at - b.at);
		this.channels[channel] = messages;
	}
}