"use strict";

const prometheusClient = require("prom-client");

module.exports = function createPrometheus() {
	let prometheusRegistry = new prometheusClient.Registry();
	prometheusClient.collectDefaultMetrics({ register: prometheusRegistry });

	return {
		prometheusRegistry: prometheusRegistry,
		metrics: {
			storedItems: new prometheusClient.Counter({
				registers: [ prometheusRegistry ],
				name: "srap_stored_items_total",
				help: "Amount of items that have been created or updated",
				labelNames: [ "tag" ]
			}),
			successfulItems: new prometheusClient.Counter({
				registers: [ prometheusRegistry ],
				name: "srap_successful_items_total",
				help: "Amount of items that have been successfully processed",
				labelNames: [ "task" ]
			}),
			failedItems: new prometheusClient.Counter({
				registers: [ prometheusRegistry ],
				name: "srap_failed_items_total",
				help: "Amount of items that have failed during processing",
				labelNames: [ "task" ]
			}),
			taskFetchTime: new prometheusClient.Gauge({
				registers: [ prometheusRegistry ],
				name: "srap_task_fetch_seconds",
				help: "Time needed for the most recent attempt at fetching new scraping tasks",
				labelNames: [ "task" ]
			}),
			taskFetchResults: new prometheusClient.Gauge({
				registers: [ prometheusRegistry ],
				name: "srap_task_fetch_results_count",
				help: "Amount of new scraping tasks fetched during the most recent attempt",
				labelNames: [ "task" ]
			}),
			taskRefillTime: new prometheusClient.Gauge({
				registers: [ prometheusRegistry ],
				name: "srap_task_refill_seconds",
				help: "Time needed for the most recent refill of the task queue",
				labelNames: [ "task" ]
			}),
			taskRefillResults: new prometheusClient.Gauge({
				registers: [ prometheusRegistry ],
				name: "srap_task_refill_results_count",
				help: "Amount of new scraping tasks added to queue during the most recent attempt",
				labelNames: [ "task" ]
			})
		}
	};
};