var PB = window.PB || {};
(function () {
    'use strict';

    PB.mc = PB.mc || {};
    PB.mc.core = PB.mc.core || {};
    PB.mcapi = PB.mcapi || {};
    var Bootstrap = {}

    PB.mc.core.Bootstrap = Bootstrap;
    PB.mcapi.Bootstrap = Bootstrap;

    Bootstrap.oi = {};
    Bootstrap.oi.token = {};
    Bootstrap.oi.token['FROM_PAYBACK_SESSION'] = 'PAYBACK_SESSION';
    Bootstrap.oi.token['FROM_PARTNER_SESSION'] = 'PARTNER_SESSION';

    var OPTIONS = {
        requiredJsFiles: [
            
                'https://www.payback.de/static/fragment/clientcommons/1.45.0/mcapi.min.js',
            
                'https://www.payback.de/static/fragment/clientcommons/1.45.0/mcapi-ui.min.js',
            
                'https://www.payback.de/static/fragment/clientcommons/1.45.0/mcapi-auth.min.js'
            
        ]
    };

    var STATUS_TYPE = {
        RUNNING: 0,
        FINISHED_SUCCESS: 1,
        FINISHED_ERROR: 2
    };

    var CURRENT_STATE = STATUS_TYPE.RUNNING;
    var CALLBACK_STACK = [];

    function buildClient(options) {
        var applicationName = 'oi';
        return PB.mc.core.Client.forApplication(applicationName, options);
    }

    function executeCallbackStack() {
        for (var key in CALLBACK_STACK) {
            if (CURRENT_STATE === STATUS_TYPE.FINISHED_SUCCESS) {
                CALLBACK_STACK[key].success(buildClient(CALLBACK_STACK[key].options));
            } else {
                CALLBACK_STACK[key].error();
            }
        }
        CALLBACK_STACK = [];
    }

    function loadScriptsRecursively(requiredJsFileIndex) {
        loadScript(OPTIONS.requiredJsFiles[requiredJsFileIndex], function () {
            if (requiredJsFileIndex + 1 === OPTIONS.requiredJsFiles.length) {
                PB.mc.core.Context.baseUrl = 'https://www.payback.de/pb/onlineintegration/iframe/';
                PB.mc.core.Context.version = '';
                PB.mc.core.Context.oiRedirectUrlTemplate = 'https://www.payback.de/pb/onlineintegration/partnertoken/{partner}/{consumerId}/{token}';
                PB.$(function () {
                    CURRENT_STATE = STATUS_TYPE.FINISHED_SUCCESS;
                    executeCallbackStack();
                });
            } else {
                loadScriptsRecursively(requiredJsFileIndex + 1);
            }
        });
    }

    var getRandomRequestDelayWithinWindow = function (requestWindowInMS) {
        'use strict';
        return Math.floor(Math.random() * requestWindowInMS);
    };
    var retryMillis = [15000, 60000, 60 * 60000, 2 * 60 * 60000];
    var retryCounters = [];

    function getScriptTag(src, callback) {
        var scriptTag = document.createElement('script'),
            head = document.getElementsByTagName('head')[0],
            isLoaded;
        scriptTag.type = 'text/javascript';
        scriptTag.src = src;
        scriptTag.onload = scriptTag.onreadystatechange = function () {
            if (!isLoaded && (!this.readyState || this.readyState === 'complete')) {
                isLoaded = true;
                callback();
            }
        };
        scriptTag.onerror = function () {

            if (typeof(retryCounters[src]) === 'undefined') {
                retryCounters[src] = 0;
            } else if (retryCounters[src] < retryMillis.length - 1) {
                retryCounters[src] += 1;
            }

            var millis = getRandomRequestDelayWithinWindow(retryMillis[retryCounters[src]]);
            setTimeout(function () {
                head.removeChild(scriptTag);

                var newScriptTag = getScriptTag(src, callback);
                head.appendChild(newScriptTag);
                scriptTag = newScriptTag;
            }, millis);
        };
        return scriptTag;
    }

    function loadScript(src, callback) {
        var scriptTag = getScriptTag(src, callback),
            head = document.getElementsByTagName('head')[0];

        head.appendChild(scriptTag);
    }

    loadScriptsRecursively(0);

    Bootstrap.createClient = function (options) {
        var success = options.onSuccess,
            error = options.onError;

        if (typeof success === 'undefined') {
            throw 'Option "onSucesss" must not be undefined!';
        }
        if (typeof error === 'undefined') {
            error = function () {
            };
        }
        if (CURRENT_STATE === STATUS_TYPE.FINISHED_SUCCESS) {
            success(buildClient(options));
        } else if (CURRENT_STATE === STATUS_TYPE.RUNNING) {
            CALLBACK_STACK.push({success: success, error: error, options: options});
        } else {
            error();
        }
    };

}());