'use strict';

const defaultValue = require("default-value");
const createEventEmitter = require("create-event-emitter");

const pruneArray = require("./prune-array");
const clampZero = require("./clamp-zero");

module.exports = function createPasteStore(options = {}) {
	let pastes = [];
	let counter = 0;
	let pasteLimit = defaultValue(options.pasteLimit, 250);

	return createEventEmitter({
		add: function addPaste(pasteData) {
			let paste = Object.assign({
				counter: counter++
			}, pasteData);

			pastes.push(paste);
			this.emit("added", paste);

			pruneArray(pastes, pasteLimit);
		},
		since: function getPastesSince(counter) {
			return pastes.filter((paste) => {
				return (paste.counter > counter);
			});
		},
		all: function getAllPastes() {
			return pastes;
		},
		last: function getLastPastes(count) {
			return pastes.slice(clampZero(pastes.length - count));
		}
	});
};