/*

 *  :organization: Logilab

 *  :copyright: 2003-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

 *  :contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr

 */

CubicWeb.require('python.js');

CubicWeb.require('htmlhelpers.js');

var JSON_BASE_URL = baseuri() + 'json?';

/*

 * inspect dom response, search for a <div class="ajaxHtmlHead"> node and

 * put its content into the real document's head.

 * This enables dynamic css and js loading and is used by replacePageChunk

 */

function loadAjaxHtmlHead(node) {

    jQuery(node).find('div.ajaxHtmlHead').appendTo(jQuery('head'));

}

function postAjaxLoad(node) {

    loadAjaxHtmlHead(node);

    // find sortable tables if there are some

    if (typeof(Sortable) != 'undefined') {

	Sortable.sortTables(node);

    }

    // find textareas and wrap them if there are some

    if (typeof(FCKeditor) != 'undefined') {

	buildWysiwygEditors(node);

    }

    if (typeof initFacetBoxEvents != 'undefined') {

	initFacetBoxEvents(node);

    }

    if (typeof buildWidgets != 'undefined') {

	buildWidgets(node);

    }

    if (typeof roundedCornersOnLoad != 'undefined') {

	roundedCornersOnLoad();

    }

    jQuery(CubicWeb).trigger('ajax-loaded');

}

// cubicweb loadxhtml plugin to make jquery handle xhtml response

jQuery.fn.loadxhtml = function(url, data, reqtype, mode) {

    var ajax = null;

    if (reqtype == 'post') {

	ajax = jQuery.post;

    } else {

	ajax = jQuery.get;

    }

    if (this.size() > 1) {

	log('loadxhtml was called with more than one element');

    }

    var node = this.get(0); // only consider the first element

    mode = mode || 'replace';

    var callback = null;

    if (data && data.callback) {

	callback = data.callback;

	delete data.callback;

    }

    ajax(url, data, function(response) {

	var domnode = getDomFromResponse(response);

	if (mode == 'swap') {

	    var origId = node.id;

	    node = swapDOM(node, domnode);

	    if (!node.id) {

		node.id = origId;

	    }

	} else if (mode == 'replace') {

	    jQuery(node).empty().append(domnode);

	} else if (mode == 'append') {

	    jQuery(node).append(domnode);

	}

	postAjaxLoad(node);

	while (jQuery.isFunction(callback)) {

	    callback = callback.apply(this, [domnode]);

	}

    });

};

/* finds each dynamic fragment in the page and executes the

 * the associated RQL to build them (Async call)

 */

function loadDynamicFragments() {

    var fragments = jQuery('div.dynamicFragment');

    if (fragments.length == 0) {

	return;

    }

    if (typeof LOADING_MSG == 'undefined') {

	LOADING_MSG = 'loading'; // this is only a safety belt, it should not happen

    }

    for(var i=0; i<fragments.length; i++) {

	var fragment = fragments[i];

	fragment.innerHTML = '<h3>' + LOADING_MSG + ' ... <img src="data/loading.gif" /></h3>';

	var rql = getNodeAttribute(fragment, 'cubicweb:rql');

	var vid = getNodeAttribute(fragment, 'cubicweb:vid');

        var extraparams = {};

	var actrql = getNodeAttribute(fragment, 'cubicweb:actualrql');

	if (actrql) { extraparams['actualrql'] = actrql; }

	var fbvid = getNodeAttribute(fragment, 'cubicweb:fallbackvid');

	if (fbvid) { extraparams['fallbackvid'] = fbvid; }

	replacePageChunk(fragment.id, rql, vid, extraparams);

    }

}

jQuery(document).ready(loadDynamicFragments);

//============= base AJAX functions to make remote calls =====================//

function remoteCallFailed(err, req) {

    if (req.status == 500) {

	updateMessage(err);

    } else {

	updateMessage(_("an error occured while processing your request"));

    }

}

/*

 * This function is the equivalent of MochiKit's loadJSONDoc but

 * uses POST instead of GET

 */

function loadJSONDocUsingPOST(url, data) {

    setProgressCursor();

    var deferred = loadJSON(url, data, 'POST');

    deferred = deferred.addErrback(remoteCallFailed);

    deferred = deferred.addCallback(resetCursor);

    return deferred;

}

/*

 * This function will call **synchronously** a remote method on the cubicweb server

 * @param fname: the function name to call (as exposed by the JSONController)

 *

 * additional arguments will be directly passed to the specified function

 *

 * It looks at http headers to guess the response type.

 */

function remoteExec(fname /* ... */) {

    setProgressCursor();

    var props = {'fname' : fname, 'pageid' : pageid,

     		 'arg': map(jQuery.toJSON, sliceList(arguments, 1))};

    var result  = jQuery.ajax({url: JSON_BASE_URL, data: props, async: false}).responseText;

    if (result) {

	result = evalJSON(result);

    }

    resetCursor();

    return result;

}

/*

 * This function will call **asynchronously** a remote method on the json

 * controller of the cubicweb http server

 *

 * @param fname: the function name to call (as exposed by the JSONController)

 *

 * additional arguments will be directly passed to the specified function

 *

 * It looks at http headers to guess the response type.

 */

function asyncRemoteExec(fname /* ... */) {

    var props = {'fname' : fname, 'pageid' : pageid,

     		 'arg': map(jQuery.toJSON, sliceList(arguments, 1))};

    return loadJSONDocUsingPOST(JSON_BASE_URL, props);

}

/* emulation of gettext's _ shortcut

 */

function _(message) {

    return remoteExec('i18n', [message])[0];

}

function userCallback(cbname) {

    asyncRemoteExec('user_callback', cbname);

}

function unloadPageData() {

    // NOTE: do not make async calls on unload if you want to avoid

    //       strange bugs

    remoteExec('unload_page_data');

}

function openHash() {

    if (document.location.hash) {

	var nid = document.location.hash.replace('#', '');

	var node = jQuery('#' + nid);

	if (node) { removeElementClass(node, "hidden"); }

    };

}

jQuery(document).ready(openHash);

function reloadComponent(compid, rql, registry, nodeid, extraargs) {

    registry = registry || 'components';

    rql = rql || '';

    nodeid = nodeid || (compid + 'Component');

    extraargs = extraargs || {};

    var node = getNode(nodeid);

    var d = asyncRemoteExec('component', compid, rql, registry, extraargs);

    d.addCallback(function(result, req) {

	var domnode = getDomFromResponse(result);

	if (node) {

	    // make sure the component is visible

	    removeElementClass(node, "hidden");

	    swapDOM(node, domnode);

	}

    });

    d.addCallback(resetCursor);

    d.addErrback(function(xxx) {

	updateMessage(_("an error occured"));

	log(xxx);

    });

  return d;

}

/* XXX: HTML architecture of cubicweb boxes is a bit strange */

function reloadBox(boxid, rql) {

    return reloadComponent(boxid, rql, 'boxes', boxid);

}

function userCallbackThenUpdateUI(cbname, compid, rql, msg, registry, nodeid) {

    var d = asyncRemoteExec('user_callback', cbname);

    d.addCallback(function() {

	reloadComponent(compid, rql, registry, nodeid);

	if (msg) { updateMessage(msg); }

    });

    d.addCallback(resetCursor);

    d.addErrback(function(xxx) {

	updateMessage(_("an error occured"));

	log(xxx);

	return resetCursor();

    });

}

function userCallbackThenReloadPage(cbname, msg) {

    var d = asyncRemoteExec('user_callback', cbname);

    d.addCallback(function() {

	window.location.reload();

	if (msg) { updateMessage(msg); }

    });

    d.addCallback(resetCursor);

    d.addErrback(function(xxx) {

	updateMessage(_("an error occured"));

	log(xxx);

	return resetCursor();

    });

}

/*

 * unregisters the python function registered on the server's side

 * while the page was generated.

 */

function unregisterUserCallback(cbname) {

    var d = asyncRemoteExec('unregister_user_callback', cbname);

    d.addCallback(function() {resetCursor();});

    d.addErrback(function(xxx) {

	updateMessage(_("an error occured"));

	log(xxx);

	return resetCursor();

    });

}

/* executes an async query to the server and replaces a node's

 * content with the query result

 *

 * @param nodeId the placeholder node's id

 * @param rql the RQL query

 * @param vid the vid to apply to the RQL selection (default if not specified)

 * @param extraparmas table of additional query parameters

 */

function replacePageChunk(nodeId, rql, vid, extraparams, /* ... */ swap, callback) {

    var params = null;

    if (callback) {

	params = {callback: callback};

    }

    var node = jQuery('#' + nodeId)[0];

    var props = {};

    if (node) {

	props['rql'] = rql;

	props['pageid'] = pageid;

	if (vid) { props['vid'] = vid; }

	if (extraparams) { jQuery.extend(props, extraparams); }

	// FIXME we need to do asURL(props) manually instead of

	// passing `props` directly to loadxml because replacePageChunk

	// is sometimes called (abusively) with some extra parameters in `vid`

	var mode = swap?'swap':'replace';

	var url = JSON_BASE_URL + asURL(props);

	jQuery(node).loadxhtml(url, params, 'get', mode);

    } else {

	log('Node', nodeId, 'not found');

    }

}

/* XXX: this function should go in edition.js but as for now, htmlReplace

 * references it.

 *

 * replace all textareas with fckeditors.

 */

function buildWysiwygEditors(parent) {

    jQuery('textarea').each(function () {

	if (this.getAttribute('cubicweb:type', 'wysiwyg')) {

	    if (typeof FCKeditor != "undefined") {

		var fck = new FCKeditor(this.id);

		fck.Config['CustomConfigurationsPath'] = fckconfigpath;

		fck.Config['DefaultLanguage'] = fcklang;

		fck.BasePath = "fckeditor/";

		fck.ReplaceTextarea();

	    } else {

		log('fckeditor could not be found.');

	    }

	}

    });

}

jQuery(document).ready(buildWysiwygEditors);

/*

 * takes a list of DOM nodes and removes all empty text nodes

 */

function stripEmptyTextNodes(nodelist) {

    var stripped = [];

    for (var i=0; i < nodelist.length; i++) {

	var node = nodelist[i];

	if (isTextNode(node) && !node.textContent.strip()) {

	    continue;

	} else {

	    stripped.push(node);

	}

    }

    return stripped;

}

/* convenience function that returns a DOM node based on req's result. */

function getDomFromResponse(response) {

    if (typeof(response) == 'string') {

	return html2dom(response);

    }

    var doc = response.documentElement;

    var children = doc.childNodes;

    if (!children.length) {

	// no child (error cases) => return the whole document

	return doc.cloneNode(true);

    }

    children = stripEmptyTextNodes(children);

    if (children.length == 1) {

	// only one child => return it

	return children[0].cloneNode(true);

    }

    // several children => wrap them in a single node and return the wrap

    return DIV(null, map(methodcaller('cloneNode', true), children));

}

function postJSON(url, data, callback) {

    return jQuery.post(url, data, callback, 'json');