/** 
* @description WSMAN communication using duktape http
* @author Ylian Saint-Hilaire
* @version v0.2.0c
*/

// Construct a WSMAN communication object
function CreateWsmanComm(host, port, user, pass, tls, extra) {
    var obj = {};
    obj.PendingAjax = [];               // List of pending AJAX calls. When one frees up, another will start.
    obj.ActiveAjaxCount = 0;            // Number of currently active AJAX calls
    obj.MaxActiveAjaxCount = 1;         // Maximum number of activate AJAX calls at the same time.
    obj.FailAllError = 0;               // Set this to non-zero to fail all AJAX calls with that error status, 999 causes responses to be silent.
    obj.host = host;
    obj.port = port;
    obj.user = user;
    obj.pass = pass;
    obj.tls = tls;
    obj.digest = null;

    // Private method
    //   pri = priority, if set to 1, the call is high priority and put on top of the stack.
    obj.PerformAjax = function (postdata, callback, tag, pri, url, action) {
        if ((obj.ActiveAjaxCount == 0 || ((obj.ActiveAjaxCount < obj.MaxActiveAjaxCount) && (obj.challengeParams != null))) && obj.PendingAjax.length == 0) {
            // There are no pending AJAX calls, perform the call now.
            obj.PerformAjaxEx(postdata, callback, tag, url, action);
        } else {
            // If this is a high priority call, put this call in front of the array, otherwise put it in the back.
            if (pri == 1) { obj.PendingAjax.unshift([postdata, callback, tag, url, action]); } else { obj.PendingAjax.push([postdata, callback, tag, url, action]); }
        }
    }

    // Private method
    obj.PerformNextAjax = function () {
        if (obj.ActiveAjaxCount >= obj.MaxActiveAjaxCount || obj.PendingAjax.length == 0) return;
        var x = obj.PendingAjax.shift();
        obj.PerformAjaxEx(x[0], x[1], x[2], x[3], x[4]);
        obj.PerformNextAjax();
    }

    // Private method
    obj.PerformAjaxEx = function (postdata, callback, tag, url, action) {
        if (obj.FailAllError != 0) { if (obj.FailAllError != 999) { obj.gotNextMessagesError({ status: obj.FailAllError }, 'error', null, [postdata, callback, tag]); } return; }
        if (!postdata) postdata = "";
        // console.log("SEND: " + postdata); // DEBUG

        // We are in a DukTape environement
        if (obj.digest == null) { obj.digest = require('http-digest').create(obj.user, obj.pass); obj.digest.http = require('http'); }
        var request = { protocol: (obj.tls == 1 ? 'https:' : 'http:'), method: 'POST', host: obj.host, path: '/wsman', port: obj.port };
        var req = obj.digest.request(request,
        function (response) {
            if (response.statusCode != 200) {
                console.log('ERR:' + JSON.stringify(response));
                obj.gotNextMessagesError({ status: response.statusCode }, 'error', null, [postdata, callback, tag]);
            } else {
                response.acc = '';
                response.on('data', function (data2) { this.acc += data2; });
                response.on('end', function () { obj.gotNextMessages(response.acc, 'success', { status: response.statusCode }, [postdata, callback, tag]); });
            }
        });
        req.on('error', function (e) { console.log(JSON.stringify(e)); obj.gotNextMessagesError({ status: 600 }, 'error', null, [postdata, callback, tag]); });

        // Send POST body, this work with binary.
        req.write(postdata);
        req.end();
        return req;
    }

    // AJAX specific private method
    obj.pendingAjaxCall = [];

    // Private method
    obj.gotNextMessages = function (data, status, request, callArgs) {
        obj.ActiveAjaxCount--;
        if (obj.FailAllError == 999) return;
        //console.log("RECV: " + data); // DEBUG
        if (obj.FailAllError != 0) { callArgs[1](null, obj.FailAllError, callArgs[2]); return; }
        if (request.status != 200) { callArgs[1](null, request.status, callArgs[2]); return; }
        callArgs[1](data, 200, callArgs[2]);
        obj.PerformNextAjax();
    }

    // Private method
    obj.gotNextMessagesError = function (request, status, errorThrown, callArgs) {
        obj.ActiveAjaxCount--;
        if (obj.FailAllError == 999) return;
        if (obj.FailAllError != 0) { callArgs[1](null, obj.FailAllError, callArgs[2]); return; }
        // if (s != 200) { console.log("ERROR, status=" + status + "\r\n\r\nreq=" + callArgs[0]); } // Debug: Display the request & response if something did not work.
        if (obj.FailAllError != 999) { callArgs[1]({ Header: { HttpError: request.status } }, request.status, callArgs[2]); }
        obj.PerformNextAjax();
    }

    // Cancel all pending queries with given status
    obj.CancelAllQueries = function (s) {
        while (obj.PendingAjax.length > 0) { var x = obj.PendingAjax.shift(); x[1](null, s, x[2]); }
    }

    return obj;
}

module.exports = CreateWsmanComm;