/** filter form, aka facets, javascript functions

 *

 *  :organization: Logilab

 *  :copyright: 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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

 */

var SELECTED_IMG = baseuri() + "data/black-check.png";

var UNSELECTED_IMG = baseuri() + "data/no-check-no-border.png";

var UNSELECTED_BORDER_IMG = baseuri() + "data/black-uncheck.png";

function copyParam(origparams, newparams, param) {

    var index = jQuery.inArray(param, origparams[0]);

    if (index > - 1) {

        newparams[param] = origparams[1][index];

    }

}

function facetFormContent($form) {

    var names = [];

    var values = [];

    $form.find('.facet').each(function() {

        var facetName = jQuery(this).find('.facetTitle').attr('cubicweb:facetName');

        var facetValues = jQuery(this).find('.facetValueSelected').each(function(x) {

            names.push(facetName);

            values.push(this.getAttribute('cubicweb:value'));

        });

    });

    $form.find('input').each(function() {

        names.push(this.name);

        values.push(this.value);

    });

    $form.find('select option[selected]').each(function() {

        names.push(this.parentNode.name);

        values.push(this.value);

    });

    return [names, values];

}

function buildRQL(divid, vid, paginate, vidargs) {

    jQuery(CubicWeb).trigger('facets-content-loading', [divid, vid, paginate, vidargs]);

    var $form = $('#' + divid + 'Form');

    var zipped = facetFormContent($form);

    zipped[0].push('facetargs');

    zipped[1].push(vidargs);

    var d = loadRemote('json', ajaxFuncArgs('filter_build_rql', null, zipped[0], zipped[1]));

    d.addCallback(function(result) {

        var rql = result[0];

        var $bkLink = jQuery('#facetBkLink');

        if ($bkLink.length) {

            var bkPath = 'view?rql=' + escape(rql);

            if (vid) {

                bkPath += '&vid=' + escape(vid);

            }

            var bkUrl = $bkLink.attr('cubicweb:target') + '&path=' + escape(bkPath);

            $bkLink.attr('href', bkUrl);

        }

        var toupdate = result[1];

        var extraparams = vidargs;

        if (paginate) { extraparams['paginate'] = '1'; } // XXX in vidargs

        // copy some parameters

        // XXX cleanup vid/divid mess

        // if vid argument is specified , the one specified in form params will

        // be overriden by replacePageChunk

        copyParam(zipped, extraparams, 'vid');

        extraparams['divid'] = divid;

        copyParam(zipped, extraparams, 'divid');

        copyParam(zipped, extraparams, 'subvid');

        copyParam(zipped, extraparams, 'fromformfilter');

        // paginate used to know if the filter box is acting, in which case we

        // want to reload action box to match current selection (we don't want

        // this from a table filter)

        extraparams['rql'] = rql;

        if (vid) { // XXX see copyParam above. Need cleanup

            extraparams['vid'] = vid;

        }

        d = $('#' + divid).loadxhtml('json', ajaxFuncArgs('view', extraparams),

                                     null, 'swap');

        d.addCallback(function() {

            // XXX rql/vid in extraparams

            jQuery(CubicWeb).trigger('facets-content-loaded', [divid, rql, vid, extraparams]);

        });

        if (paginate) {

            // FIXME the edit box might not be displayed in which case we don't

            // know where to put the potential new one, just skip this case for

            // now

            var $node = jQuery('#edit_box');

            if ($node.length) {

                $node.loadxhtml('json', ajaxFuncArgs('render', {

                    'rql': rql

                },

                'ctxcomponents', 'edit_box'));

            }

            $node = jQuery('#breadcrumbs')

            if ($node.length) {

                $node.loadxhtml('json', ajaxFuncArgs('render', {

                    'rql': rql

                },

                'ctxcomponents', 'breadcrumbs'));

            }

        }

        var d = loadRemote('json', ajaxFuncArgs('filter_select_content', null, toupdate, rql));

        d.addCallback(function(updateMap) {

            for (facetId in updateMap) {

                var values = updateMap[facetId];

                cw.jqNode(facetId).find('.facetCheckBox').each(function() {

                    var value = this.getAttribute('cubicweb:value');

                    if (jQuery.inArray(value, values) == -1) {

                        if (!jQuery(this).hasClass('facetValueDisabled')) {

                            jQuery(this).addClass('facetValueDisabled');

                        }

                    } else {

                        if (jQuery(this).hasClass('facetValueDisabled')) {

                            jQuery(this).removeClass('facetValueDisabled');

                        }

                    }

                });

            }

        });

    });

}

function initFacetBoxEvents(root) {

    // facetargs : (divid, vid, paginate, extraargs)

    root = root || document;

    jQuery(root).find('form').each(function() {

        var form = jQuery(this);

        // NOTE: don't evaluate facetargs here but in callbacks since its value

        //       may changes and we must send its value when the callback is

        //       called, not when the page is initialized

        var facetargs = form.attr('cubicweb:facetargs');

        if (facetargs !== undefined) {

            form.submit(function() {

                buildRQL.apply(null, cw.evalJSON(form.attr('cubicweb:facetargs')));

                return false;

            });

            form.find('div.facet').each(function() {

                var facet = jQuery(this);

                facet.find('div.facetCheckBox').each(function(i) {

                    this.setAttribute('cubicweb:idx', i);

                });

                facet.find('div.facetCheckBox').click(function() {

                    var $this = jQuery(this);

                    // NOTE : add test on the facet operator (i.e. OR, AND)

                    // if ($this.hasClass('facetValueDisabled')){

                    //          return

                    // }

                    if ($this.hasClass('facetValueSelected')) {

                        $this.removeClass('facetValueSelected');

                        $this.find('img').each(function(i) {

                            if (this.getAttribute('cubicweb:unselimg')) {

                                this.setAttribute('src', UNSELECTED_BORDER_IMG);

                                this.setAttribute('alt', (_('not selected')));

                            }

                            else {

                                this.setAttribute('src', UNSELECTED_IMG);

                                this.setAttribute('alt', (_('not selected')));

                            }

                        });

                        var index = parseInt($this.attr('cubicweb:idx'));

                        // we dont need to move the element when cubicweb:idx == 0

                        if (index > 0) {

                            var shift = jQuery.grep(facet.find('.facetValueSelected'), function(n) {

                                var nindex = parseInt(n.getAttribute('cubicweb:idx'));

                                return nindex > index;

                            }).length;

                            index += shift;

                            var parent = this.parentNode;

                            var $insertAfter = jQuery(parent).find('.facetCheckBox:nth(' + index + ')');

                            if (! ($insertAfter.length == 1 && shift == 0)) {

                                // only rearrange element if necessary

                                $insertAfter.after(this);

                            }

                        }

                    } else {

                        var lastSelected = facet.find('.facetValueSelected:last');

                        if (lastSelected.length) {

                            lastSelected.after(this);

                        } else {

                            var parent = this.parentNode;

                            jQuery(parent).prepend(this);

                        }

                        jQuery(this).addClass('facetValueSelected');

                        var $img = jQuery(this).find('img');

                        $img.attr('src', SELECTED_IMG).attr('alt', (_('selected')));

                    }

                    buildRQL.apply(null, cw.evalJSON(form.attr('cubicweb:facetargs')));

                    facet.find('.facetBody').animate({

                        scrollTop: 0

                    },

                    '');

                });

                facet.find('select.facetOperator').change(function() {

                    var nbselected = facet.find('div.facetValueSelected').length;

                    if (nbselected >= 2) {

                        buildRQL.apply(null, cw.evalJSON(form.attr('cubicweb:facetargs')));

                    }

                });

                facet.find('div.facetTitle').click(function() {

                    facet.find('div.facetBody').toggleClass('hidden').toggleClass('opened');

                    jQuery(this).toggleClass('opened');

                });

            });

        }

    });

}

// trigger this function on document ready event if you provide some kind of

// persistent search (eg crih)

function reorderFacetsItems(root) {

    root = root || document;

    jQuery(root).find('form').each(function() {

        var form = jQuery(this);

        if (form.attr('cubicweb:facetargs')) {

            form.find('div.facet').each(function() {

                var facet = jQuery(this);

                var lastSelected = null;

                facet.find('div.facetCheckBox').each(function(i) {

                    var $this = jQuery(this);

                    if ($this.hasClass('facetValueSelected')) {

                        if (lastSelected) {

                            lastSelected.after(this);

                        } else {

                            var parent = this.parentNode;

                            jQuery(parent).prepend(this);

                        }

                        lastSelected = $this;

                    }

                });

            });

        }

    });

}

// change css class of facets that have a value selected

function updateFacetTitles() {

    $('.facet').each(function() {

        var $divTitle = $(this).find('.facetTitle');

    });

}

// we need to differenciate cases where initFacetBoxEvents is called with one

// argument or without any argument. If we use `initFacetBoxEvents` as the

// direct callback on the jQuery.ready event, jQuery will pass some argument of

// his, so we use this small anonymous function instead.

jQuery(document).ready(function() {

    initFacetBoxEvents();

    jQuery(cw).bind('facets-content-loading', updateFacetTitles);

});