import { errorMessages, successMessages } from "../utils/messages.js";
/**
 * Constructs a new NetworkService instance.
 *
 * @param {Object} axios - The axios instance for HTTP requests.
 * @param {Object} ping - The ping utility for network checks.
 * @param {Object} logger - The logger instance for logging.
 * @param {Object} http - The HTTP utility for network operations.
 */
class NetworkService {
	constructor(axios, ping, logger, http) {
		this.TYPE_PING = "ping";
		this.TYPE_HTTP = "http";
		this.TYPE_PAGESPEED = "pagespeed";
		this.TYPE_HARDWARE = "hardware";
		this.SERVICE_NAME = "NetworkService";
		this.NETWORK_ERROR = 5000;
		this.PING_ERROR = 5001;
		this.axios = axios;
		this.ping = ping;
		this.logger = logger;
		this.http = http;
	}

	/**
	 * Times the execution of an asynchronous operation.
	 *
	 * @param {Function} operation - The asynchronous operation to be timed.
	 * @returns {Promise<Object>} An object containing the response, response time, and optionally an error.
	 * @property {Object|null} response - The response from the operation, or null if an error occurred.
	 * @property {number} responseTime - The time taken for the operation to complete, in milliseconds.
	 * @property {Error} [error] - The error object if an error occurred during the operation.
	 */
	async timeRequest(operation) {
		const startTime = Date.now();
		try {
			const response = await operation();
			const endTime = Date.now();
			const responseTime = endTime - startTime;
			return { response, responseTime };
		} catch (error) {
			const endTime = Date.now();
			const responseTime = endTime - startTime;
			return { response: null, responseTime, error };
		}
	}

	/**
	 * Sends a ping request to the specified URL and returns the response.
	 *
	 * @param {Object} job - The job object containing the data for the ping request.
	 * @param {Object} job.data - The data object within the job.
	 * @param {string} job.data.url - The URL to ping.
	 * @param {string} job.data._id - The monitor ID for the ping request.
	 * @returns {Promise<Object>} An object containing the ping response details.
	 * @property {string} monitorId - The monitor ID for the ping request.
	 * @property {string} type - The type of request, which is "ping".
	 * @property {number} responseTime - The time taken for the ping request to complete, in milliseconds.
	 * @property {Object} payload - The response payload from the ping request.
	 * @property {boolean} status - The status of the ping request (true if successful, false otherwise).
	 * @property {number} code - The response code (200 if successful, error code otherwise).
	 * @property {string} message - The message indicating the result of the ping request.
	 */
	async requestPing(job) {
		const url = job.data.url;
		const { response, responseTime, error } = await this.timeRequest(() =>
			this.ping.promise.probe(url)
		);

		const pingResponse = {
			monitorId: job.data._id,
			type: "ping",
			responseTime,
			payload: response,
		};
		if (error) {
			pingResponse.status = false;
			pingResponse.code = this.PING_ERROR;
			pingResponse.message = errorMessages.PING_CANNOT_RESOLVE;
			return pingResponse;
		}

		pingResponse.code = 200;
		pingResponse.status = response.alive;
		pingResponse.message = successMessages.PING_SUCCESS;
		return pingResponse;
	}

	/**
	 * Sends an HTTP GET request to the specified URL and returns the response.
	 *
	 * @param {Object} job - The job object containing the data for the HTTP request.
	 * @param {Object} job.data - The data object within the job.
	 * @param {string} job.data.url - The URL to send the HTTP GET request to.
	 * @param {string} job.data._id - The monitor ID for the HTTP request.
	 * @param {string} [job.data.secret] - Secret for authorization if provided.
	 * @returns {Promise<Object>} An object containing the HTTP response details.
	 * @property {string} monitorId - The monitor ID for the HTTP request.
	 * @property {string} type - The type of request, which is "http".
	 * @property {number} responseTime - The time taken for the HTTP request to complete, in milliseconds.
	 * @property {Object} payload - The response payload from the HTTP request.
	 * @property {boolean} status - The status of the HTTP request (true if successful, false otherwise).
	 * @property {number} code - The response code (200 if successful, error code otherwise).
	 * @property {string} message - The message indicating the result of the HTTP request.
	 */
	async requestHttp(job) {
		const url = job.data.url;
		const config = {};

		job.data.secret !== undefined &&
			(config.headers = { Authorization: `Bearer ${job.data.secret}` });

		const { response, responseTime, error } = await this.timeRequest(() =>
			this.axios.get(url, config)
		);

		const httpResponse = {
			monitorId: job.data._id,
			type: job.data.type,
			responseTime,
			payload: response?.data,
		};

		if (error) {
			const code = error.response?.status || this.NETWORK_ERROR;
			httpResponse.code = code;
			httpResponse.status = false;
			httpResponse.message = this.http.STATUS_CODES[code] || "Network Error";
			return httpResponse;
		}
		httpResponse.status = true;
		httpResponse.code = response.status;
		httpResponse.message = this.http.STATUS_CODES[response.status];
		return httpResponse;
	}

	/**
	 * Sends a request to the Google PageSpeed Insights API for the specified URL and returns the response.
	 *
	 * @param {Object} job - The job object containing the data for the PageSpeed request.
	 * @param {Object} job.data - The data object within the job.
	 * @param {string} job.data.url - The URL to analyze with PageSpeed Insights.
	 * @param {string} job.data._id - The monitor ID for the PageSpeed request.
	 * @returns {Promise<Object>} An object containing the PageSpeed response details.
	 * @property {string} monitorId - The monitor ID for the PageSpeed request.
	 * @property {string} type - The type of request, which is "pagespeed".
	 * @property {number} responseTime - The time taken for the PageSpeed request to complete, in milliseconds.
	 * @property {Object} payload - The response payload from the PageSpeed request.
	 * @property {boolean} status - The status of the PageSpeed request (true if successful, false otherwise).
	 * @property {number} code - The response code (200 if successful, error code otherwise).
	 * @property {string} message - The message indicating the result of the PageSpeed request.
	 */
	async requestPagespeed(job) {
		const url = job.data.url;
		const updatedJob = { ...job };
		const pagespeedUrl = `https://pagespeedonline.googleapis.com/pagespeedonline/v5/runPagespeed?url=${url}&category=seo&category=accessibility&category=best-practices&category=performance`;
		updatedJob.data.url = pagespeedUrl;
		return this.requestHttp(updatedJob);
	}

	async requestHardware(job) {
		return this.requestHttp(job);
	}

	/**
	 * Gets the status of a job based on its type and returns the appropriate response.
	 *
	 * @param {Object} job - The job object containing the data for the status request.
	 * @param {Object} job.data - The data object within the job.
	 * @param {string} job.data.type - The type of the job (e.g., "ping", "http", "pagespeed", "hardware").
	 * @returns {Promise<Object>} The response object from the appropriate request method.
	 * @throws {Error} Throws an error if the job type is unsupported.
	 */
	async getStatus(job) {
		switch (job.data.type) {
			case this.TYPE_PING:
				return await this.requestPing(job);
			case this.TYPE_HTTP:
				return await this.requestHttp(job);
			case this.TYPE_PAGESPEED:
				return await this.requestPagespeed(job);
			case this.TYPE_HARDWARE:
				return await this.requestHardware(job);
			default:
				this.logger.error({
					message: `Unsupported type: ${job.data.type}`,
					service: this.SERVICE_NAME,
					method: "getStatus",
				});
				return {};
		}
	}
}

export default NetworkService;