/* global __filename, Strophe */
/**
 * Strophe logger implementation. Logs from level WARN and above.
 */
import {getLogger} from "jitsi-meet-logger";
const logger = getLogger(__filename);
import GlobalOnErrorHandler from "../util/GlobalOnErrorHandler";

/**
 * This is the last HTTP error status captured from Strophe debug logs.
 * The purpose of storing it is to distinguish between the network and
 * infrastructure reason for connection being dropped (see connectionHandler in
 * xmpp.js). The value will be cleared (-1) if the subsequent request succeeds
 * which means that the failure could be transient.
 *
 * FIXME in the latest Strophe (not released on npm) there is API to handle
 * particular HTTP errors, but there is no way to learn if the subsequent
 * request succeeded in order to tell if the error was one time incident or if
 * it was the reason for dropping the connection by Strophe (the connection is
 * dropped after 5 subsequent failures). Ideally Strophe should provide more
 * details about the reason on why the connection stopped.
 *
 * @type {number}
 */
let lastErrorStatus = -1;

/**
 * A regular expression used to catch Strophe's log message indicating that the
 * last BOSH request was successful. When there is such message seen the
 * {@link lastErrorStatus} will be set back to '-1'.
 * @type {RegExp}
 */
const resetLastErrorStatusRegExpr = /request id \d+.\d+ got 200/;

/**
 * A regular expression used to capture the current value of the BOSH request
 * error status (HTTP error code or '0' or something else).
 * @type {RegExp}
 */
const lastErrorStatusRegExpr
    = /request errored, status: (\d+), number of errors: \d+/;

export default function () {

    Strophe.log = function (level, msg) {
        // Our global handler reports uncaught errors to the stats which may
        // interpret those as partial call failure.
        // Strophe log entry about secondary request timeout does not mean that
        // it's a final failure(the request will be restarted), so we lower it's
        // level here to a warning.
        logger.trace("Strophe", level, msg);
        if (typeof msg === 'string' &&
                msg.indexOf("Request ") !== -1 &&
                msg.indexOf("timed out (secondary), restarting") !== -1) {
            level = Strophe.LogLevel.WARN;
        }
        /* eslint-disable no-case-declarations */
        switch (level) {
            case Strophe.LogLevel.DEBUG:
                // The log message which reports successful status is logged
                // on Strophe's DEBUG level
                if (lastErrorStatus !== -1 &&
                        resetLastErrorStatusRegExpr.test(msg)) {
                    logger.debug("Reset lastErrorStatus");
                    lastErrorStatus = -1;
                }
                break;
            case Strophe.LogLevel.WARN:
                logger.warn("Strophe: " + msg);
                const errStatusCapture = lastErrorStatusRegExpr.exec(msg);
                if (errStatusCapture && errStatusCapture.length === 2) {
                    lastErrorStatus = parseInt(errStatusCapture[1]);
                    logger.debug(
                        "lastErrorStatus set to: " + lastErrorStatus);
                }
                break;
            case Strophe.LogLevel.ERROR:
            case Strophe.LogLevel.FATAL:
                msg = "Strophe: " + msg;
                GlobalOnErrorHandler.callErrorHandler(new Error(msg));
                logger.error(msg);
                break;
        }
        /* eslint-enable no-case-declarations */
    };

    /**
     * Returns error status (HTTP error code) of the last BOSH request.
     *
     * @return {number} HTTP error code, '0' for unknown or "god knows what"
     * (this is a hack).
     */
    Strophe.getLastErrorStatus = function () {
        return lastErrorStatus;
    };

    Strophe.getStatusString = function (status) {
        switch (status) {
            case Strophe.Status.ERROR:
                return "ERROR";
            case Strophe.Status.CONNECTING:
                return "CONNECTING";
            case Strophe.Status.CONNFAIL:
                return "CONNFAIL";
            case Strophe.Status.AUTHENTICATING:
                return "AUTHENTICATING";
            case Strophe.Status.AUTHFAIL:
                return "AUTHFAIL";
            case Strophe.Status.CONNECTED:
                return "CONNECTED";
            case Strophe.Status.DISCONNECTED:
                return "DISCONNECTED";
            case Strophe.Status.DISCONNECTING:
                return "DISCONNECTING";
            case Strophe.Status.ATTACHED:
                return "ATTACHED";
            default:
                return "unknown";
        }
    };
}