/**
 * @depend core.js
 * @depend ../extend.js
 * @depend event.js
 * @depend ../log_error.js
 */
/**
 * Fake XDomainRequest object
 */

/**
 * Returns the global to prevent assigning values to 'this' when this is undefined.
 * This can occur when files are interpreted by node in strict mode.
 * @private
 */
function getGlobal() {
    "use strict";

    return typeof window !== "undefined" ? window : global;
}

if (typeof sinon === "undefined") {
    if (typeof this === "undefined") {
        getGlobal().sinon = {};
    } else {
        this.sinon = {};
    }
}

// wrapper for global
(function (global) {
    "use strict";

    var xdr = { XDomainRequest: global.XDomainRequest };
    xdr.GlobalXDomainRequest = global.XDomainRequest;
    xdr.supportsXDR = typeof xdr.GlobalXDomainRequest !== "undefined";
    xdr.workingXDR = xdr.supportsXDR ? xdr.GlobalXDomainRequest : false;

    function makeApi(sinon) {
        sinon.xdr = xdr;

        function FakeXDomainRequest() {
            this.readyState = FakeXDomainRequest.UNSENT;
            this.requestBody = null;
            this.requestHeaders = {};
            this.status = 0;
            this.timeout = null;

            if (typeof FakeXDomainRequest.onCreate === "function") {
                FakeXDomainRequest.onCreate(this);
            }
        }

        function verifyState(x) {
            if (x.readyState !== FakeXDomainRequest.OPENED) {
                throw new Error("INVALID_STATE_ERR");
            }

            if (x.sendFlag) {
                throw new Error("INVALID_STATE_ERR");
            }
        }

        function verifyRequestSent(x) {
            if (x.readyState === FakeXDomainRequest.UNSENT) {
                throw new Error("Request not sent");
            }
            if (x.readyState === FakeXDomainRequest.DONE) {
                throw new Error("Request done");
            }
        }

        function verifyResponseBodyType(body) {
            if (typeof body !== "string") {
                var error = new Error("Attempted to respond to fake XDomainRequest with " +
                                    body + ", which is not a string.");
                error.name = "InvalidBodyException";
                throw error;
            }
        }

        sinon.extend(FakeXDomainRequest.prototype, sinon.EventTarget, {
            open: function open(method, url) {
                this.method = method;
                this.url = url;

                this.responseText = null;
                this.sendFlag = false;

                this.readyStateChange(FakeXDomainRequest.OPENED);
            },

            readyStateChange: function readyStateChange(state) {
                this.readyState = state;
                var eventName = "";
                switch (this.readyState) {
                case FakeXDomainRequest.UNSENT:
                    break;
                case FakeXDomainRequest.OPENED:
                    break;
                case FakeXDomainRequest.LOADING:
                    if (this.sendFlag) {
                        //raise the progress event
                        eventName = "onprogress";
                    }
                    break;
                case FakeXDomainRequest.DONE:
                    if (this.isTimeout) {
                        eventName = "ontimeout";
                    } else if (this.errorFlag || (this.status < 200 || this.status > 299)) {
                        eventName = "onerror";
                    } else {
                        eventName = "onload";
                    }
                    break;
                }

                // raising event (if defined)
                if (eventName) {
                    if (typeof this[eventName] === "function") {
                        try {
                            this[eventName]();
                        } catch (e) {
                            sinon.logError("Fake XHR " + eventName + " handler", e);
                        }
                    }
                }
            },

            send: function send(data) {
                verifyState(this);

                if (!/^(get|head)$/i.test(this.method)) {
                    this.requestBody = data;
                }
                this.requestHeaders["Content-Type"] = "text/plain;charset=utf-8";

                this.errorFlag = false;
                this.sendFlag = true;
                this.readyStateChange(FakeXDomainRequest.OPENED);

                if (typeof this.onSend === "function") {
                    this.onSend(this);
                }
            },

            abort: function abort() {
                this.aborted = true;
                this.responseText = null;
                this.errorFlag = true;

                if (this.readyState > sinon.FakeXDomainRequest.UNSENT && this.sendFlag) {
                    this.readyStateChange(sinon.FakeXDomainRequest.DONE);
                    this.sendFlag = false;
                }
            },

            setResponseBody: function setResponseBody(body) {
                verifyRequestSent(this);
                verifyResponseBodyType(body);

                var chunkSize = this.chunkSize || 10;
                var index = 0;
                this.responseText = "";

                do {
                    this.readyStateChange(FakeXDomainRequest.LOADING);
                    this.responseText += body.substring(index, index + chunkSize);
                    index += chunkSize;
                } while (index < body.length);

                this.readyStateChange(FakeXDomainRequest.DONE);
            },

            respond: function respond(status, contentType, body) {
                // content-type ignored, since XDomainRequest does not carry this
                // we keep the same syntax for respond(...) as for FakeXMLHttpRequest to ease
                // test integration across browsers
                this.status = typeof status === "number" ? status : 200;
                this.setResponseBody(body || "");
            },

            simulatetimeout: function simulatetimeout() {
                this.status = 0;
                this.isTimeout = true;
                // Access to this should actually throw an error
                this.responseText = undefined;
                this.readyStateChange(FakeXDomainRequest.DONE);
            }
        });

        sinon.extend(FakeXDomainRequest, {
            UNSENT: 0,
            OPENED: 1,
            LOADING: 3,
            DONE: 4
        });

        sinon.useFakeXDomainRequest = function useFakeXDomainRequest() {
            sinon.FakeXDomainRequest.restore = function restore(keepOnCreate) {
                if (xdr.supportsXDR) {
                    global.XDomainRequest = xdr.GlobalXDomainRequest;
                }

                delete sinon.FakeXDomainRequest.restore;

                if (keepOnCreate !== true) {
                    delete sinon.FakeXDomainRequest.onCreate;
                }
            };
            if (xdr.supportsXDR) {
                global.XDomainRequest = sinon.FakeXDomainRequest;
            }
            return sinon.FakeXDomainRequest;
        };

        sinon.FakeXDomainRequest = FakeXDomainRequest;
    }

    var isNode = typeof module !== "undefined" && module.exports && typeof require === "function";
    var isAMD = typeof define === "function" && typeof define.amd === "object" && define.amd;

    function loadDependencies(require, exports, module) {
        var sinon = require("./core");
        require("../extend");
        require("./event");
        require("../log_error");
        makeApi(sinon);
        module.exports = sinon;
    }

    if (isAMD) {
        define(loadDependencies);
    } else if (isNode) {
        loadDependencies(require, module.exports, module);
    } else {
        makeApi(sinon); // eslint-disable-line no-undef
    }
})(typeof global !== "undefined" ? global : self);
