define([
    '/api/config?cb=' + Math.random().toString(16).substring(2),
    '/common/messages.js',
    '/common/crypto.js',
    '/socket/realtime-input.js',
    '/common/convert.js',
    '/socket/toolbar.js',
    '/common/cursor.js',
    '/common/json-ot.js',
    '/bower_components/diff-dom/diffDOM.js',
    '/bower_components/jquery/dist/jquery.min.js',
    '/customize/pad.js'
], function (Config, Messages, Crypto, realtimeInput, Convert, Toolbar, Cursor, JsonOT) {
    var $ = window.jQuery;
    var ifrw = $('#pad-iframe')[0].contentWindow;
    var Ckeditor; // to be initialized later...
    var DiffDom = window.diffDOM;

    window.Convert = Convert;

    window.Toolbar = Toolbar;

    var userName = Crypto.rand64(8),
        toolbar;

    var module = {};

    var andThen = function (Ckeditor) {
        $(window).on('hashchange', function() {
            window.location.reload();
        });
        if (window.location.href.indexOf('#') === -1) {
            window.location.href = window.location.href + '#' + Crypto.genKey();
            return;
        }

        var fixThings = false;
        var key = Crypto.parseKey(window.location.hash.substring(1));
        var editor = window.editor = Ckeditor.replace('editor1', {
            // https://dev.ckeditor.com/ticket/10907
            needsBrFiller: fixThings,
            needsNbspFiller: fixThings,
            removeButtons: 'Source,Maximize',
            // magicline plugin inserts html crap into the document which is not part of the
            // document itself and causes problems when it's sent across the wire and reflected back
            // but we filter it now, so that's ok.
            removePlugins: 'resize'
        });

        editor.on('instanceReady', function (Ckeditor) {
            editor.execCommand('maximize');
            var documentBody = ifrw.$('iframe')[0].contentDocument.body;

            documentBody.innerHTML = Messages.initialState;

            var inner = window.inner = documentBody;
            var cursor = window.cursor = Cursor(inner);

            var $textarea = $('#feedback');

            var setEditable = function (bool) {
                // inner.style.backgroundColor = bool? 'unset': 'grey';
                inner.setAttribute('contenteditable', bool);
            };

            // don't let the user edit until the pad is ready
            setEditable(false);

            var diffOptions = {
                preDiffApply: function (info) {

                    // no use trying to recover the cursor if it doesn't exist
                    if (!cursor.exists()) { return; }

                    /*  frame is either 0, 1, 2, or 3, depending on which
                        cursor frames were affected: none, first, last, or both
                    */
                    var frame = info.frame = cursor.inNode(info.node);

                    if (!frame) { return; }

                    if (typeof info.diff.oldValue === 'string' && typeof info.diff.newValue === 'string') {
                        var pushes = cursor.pushDelta(info.diff.oldValue, info.diff.newValue);

                        if (frame & 1) {
                            // push cursor start if necessary
                            if (pushes.commonStart < cursor.Range.start.offset) {
                                cursor.Range.start.offset += pushes.delta;
                            }
                        }
                        if (frame & 2) {
                            // push cursor end if necessary
                            if (pushes.commonStart < cursor.Range.end.offset) {
                                cursor.Range.end.offset += pushes.delta;
                            }
                        }
                    }
                },
                postDiffApply: function (info) {
                    if (info.frame) {
                        if (info.node) {
                            if (info.frame & 1) { cursor.fixStart(info.node); }
                            if (info.frame & 2) { cursor.fixEnd(info.node); }
                        } else { console.error("info.node did not exist"); }

                        var sel = cursor.makeSelection();
                        var range = cursor.makeRange();

                        cursor.fixSelection(sel, range);
                    }
                }
            };

            var initializing = true;

            var assertStateMatches = function () {
                var userDocState = module.realtimeInput.realtime.getUserDoc();
                var currentState = $textarea.val();
                if (currentState !== userDocState) {
                    console.log({
                        userDocState: userDocState,
                        currentState: currentState
                    });
                    throw new Error("currentState !== userDocState");
                }
            };

            // apply patches, and try not to lose the cursor in the process!
            var applyHjson = function (shjson) {
                setEditable(false);
                var userDocStateDom = Convert.hjson.to.dom(JSON.parse(shjson));
                userDocStateDom.setAttribute("contenteditable", "true"); // lol wtf
                var DD = new DiffDom(diffOptions);

                assertStateMatches();

                var patch = (DD).diff(inner, userDocStateDom);
                (DD).apply(inner, patch);

                // push back to the textarea so we get a userDocState
                setEditable(true);
            };

            var onRemote = function (shjson) {
                if (initializing) { return; }

                // remember where the cursor is
                cursor.update();

                // TODO call propogate

                // build a dom from HJSON, diff, and patch the editor
                applyHjson(shjson);
            };

            var onInit = function (info) {
                var $bar = $('#pad-iframe')[0].contentWindow.$('#cke_1_toolbox');
                toolbar = info.realtime.toolbar = Toolbar.create($bar, userName, info.realtime);
                /* TODO handle disconnects and such*/
            };

            var onReady = function (info) {
                console.log("Unlocking editor");
                initializing = false;
                setEditable(true);
                applyHjson($textarea.val());
                $textarea.trigger('keyup');
            };

            var onAbort = function (info) {
                console.log("Aborting the session!");
                // stop the user from continuing to edit
                setEditable(false);
                // TODO inform them that the session was torn down
                toolbar.failed();
            };

            var realtimeOptions = {
                // configuration :D
                doc: inner,
                // first thing called
                onInit: onInit,

                onReady: onReady,

                // when remote changes occur
                onRemote: onRemote,

                // handle aborts
                onAbort: onAbort,

                // really basic operational transform
                transformFunction : JsonOT.validate
                // pass in websocket/netflux object TODO
            };

            var rti = module.realtimeInput = window.rti = realtimeInput.start($textarea[0], // synced element
                                    Config.websocketURL, // websocketURL, ofc
                                    userName, // userName
                                    key.channel, // channelName
                                    key.cryptKey, // key
                                    realtimeOptions);

            $textarea.val(JSON.stringify(Convert.dom.to.hjson(inner)));

            var isNotMagicLine = function (el) {
                // factor as:
                // return !(el.tagName === 'SPAN' && el.contentEditable === 'false');
                var filter = (el.tagName === 'SPAN' && el.contentEditable === 'false');
                if (filter) {
                    console.log("[hyperjson.serializer] prevented an element" +
                        "from being serialized:", el);
                    return false;
                }
                return true;
            };

            var propogate = function () {
                var hjson = Convert.core.hyperjson.fromDOM(inner, isNotMagicLine);

                $textarea.val(JSON.stringify(hjson));
                rti.bumpSharejs();
            };

            var testInput = window.testInput = function (el, offset) {
                var i = 0,
                    j = offset,
                    input = "The quick red fox jumped over the lazy brown dog. ",
                    l = input.length,
                    errors = 0,
                    max_errors = 15,
                    interval;
                var cancel = function () {
                    if (interval) { window.clearInterval(interval); }
                };

                interval = window.setInterval(function () {
                    propogate();
                    try {
                        el.replaceData(j, 0, input.charAt(i));
                    } catch (err) {
                        errors++;
                        if (errors >= max_errors) {
                            console.log("Max error number exceeded");
                            cancel();
                        }

                        console.error(err);
                        var next = document.createTextNode("");
                        el.parentNode.appendChild(next);
                        el = next;
                        j = 0;
                    }
                    i = (i + 1) % l;
                    j++;
                }, 200);

                return {
                    cancel: cancel
                };
            };

            var easyTest = window.easyTest = function () {
                cursor.update();
                var start = cursor.Range.start;
                var test = testInput(start.el, start.offset);
                //window.rti.bumpSharejs();
                propogate();
                return test;
            };

            editor.on('change', propogate);
        });
    };

    var interval = 100;
    var first = function () {
        Ckeditor = ifrw.CKEDITOR;
        if (Ckeditor) {
            andThen(Ckeditor);
        } else {
            console.log("Ckeditor was not defined. Trying again in %sms",interval);
            setTimeout(first, interval);
        }
    };

    $(first);
});