/**
 * Copyright 2013 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

RED.palette = (function() {

    var exclusion = ['config','unknown','deprecated'];
    var core = ['input', 'output', 'function', 'social', 'storage', 'analysis', 'advanced'];

    function createCategoryContainer(category){
        var escapedCategory = category.replace(" ","_");
        $("#palette-container").append('<div class="palette-category">'+
            '<div id="header-'+category+'" class="palette-header"><i class="expanded fa fa-caret-down"></i><span>'+category.replace("_"," ")+'</span></div>'+
            '<div class="palette-content" id="palette-base-category-'+category+'">'+
            '<div id="palette-'+category+'-input"></div>'+
            '<div id="palette-'+category+'-output"></div>'+
            '<div id="palette-'+category+'-function"></div>'+
            '</div>'+
            '</div>');

        $("#header-"+category).on('click', function(e) {
            $(this).next().slideToggle();
            $(this).children("i").toggleClass("expanded");
        });
    }

    core.forEach(createCategoryContainer);

    function addNodeType(nt,def) {

        var nodeTypeId = nt.replace(" ","_");

        if ($("#palette_node_"+nodeTypeId).length) {
            return;
        }

        if (exclusion.indexOf(def.category)===-1) {

            var category = def.category.replace(" ","_");
            var rootCategory = category.split("-")[0];

            var d = document.createElement("div");
            d.id = "palette_node_"+nodeTypeId;
            d.type = nt;

            // calculate width of label text
            $.fn.textWidth = function(text, font) {
                if (!$.fn.textWidth.fakeEl) {
                    $.fn.textWidth.fakeEl = $('<span>').hide().appendTo(document.body);
                }
                $.fn.textWidth.fakeEl.text(text || this.val() || this.text()).css('font', font || this.css('font'));
                return $.fn.textWidth.fakeEl.width();
            };

            var label;
                                
            if (typeof def.paletteLabel === "undefined") {
                label = /^(.*?)([ -]in|[ -]out)?$/.exec(nt)[1];
            } else { 
                label = (typeof def.paletteLabel === "function" ? def.paletteLabel.call(def) : def.paletteLabel)||"";
            }
                
            var pixels = $.fn.textWidth(label, '13px helvetica');
            var nodeWidth = 90;
            var labelWidth = nodeWidth - 10;
            var numLines = Math.ceil(pixels / nodeWidth);
            var multiLine = numLines > 1;

            // styles matching with style.css
            var nodeHeight = 25;
            var lineHeight = 16;
            var portHeight = 10;
            var multiLineNodeHeight = lineHeight * numLines + (nodeHeight - lineHeight);

            d.innerHTML = '<div class="palette_label"'+
                (multiLine ? 'style="line-height: '+
                    lineHeight + 'px; margin-top: 5px"' : '')+
                '>'+label+"</div>";
            d.className="palette_node";
            if (def.icon) {
                d.style.backgroundImage = "url(icons/"+def.icon+")";
                if (multiLine) {
                    d.style.backgroundSize = "18px 27px";
                }
                if (def.align == "right") {
                    d.style.backgroundPosition = "95% 50%";
                } else if (def.inputs > 0) {
                    d.style.backgroundPosition = "10% 50%";
                }
            }

            d.style.backgroundColor = def.color;
            d.style.height = multiLineNodeHeight + "px";

            if (def.outputs > 0) {
                var portOut = document.createElement("div");
                portOut.className = "palette_port palette_port_output";
                if (multiLine) {
                    portOut.style.top = ((multiLineNodeHeight - portHeight) / 2) + "px";
                }
                d.appendChild(portOut);
            }

            if (def.inputs > 0) {
                var portIn = document.createElement("div");
                portIn.className = "palette_port";
                if (multiLine) {
                    portIn.style.top = ((multiLineNodeHeight - portHeight) / 2) + "px";
                }
                d.appendChild(portIn);
            }

            if ($("#palette-base-category-"+rootCategory).length === 0) {
                createCategoryContainer(rootCategory);
            }

            if ($("#palette-"+category).length === 0) {
                $("#palette-base-category-"+rootCategory).append('<div id="palette-'+category+'"></div>');
            }

            $("#palette-"+category).append(d);
            d.onmousedown = function(e) { e.preventDefault(); };

            var popOverContent;
            try {
                popOverContent = $("<p><b>"+label+"</b></p>"+($("script[data-help-name|='"+nt+"']").html().trim()||"<p>no information available</p>")).slice(0,2);
            } catch(err) {
                // Malformed HTML may cause errors. TODO: need to understand what can break
                console.log("Error generating pop-over label for '"+nt+"'.");
                console.log(err.toString());
                popOverContent = "<p><b>"+label+"</b></p><p>no information available</p>";
            }
            $(d).popover({
                title:d.type,
                placement:"right",
                trigger: "hover",
                delay: { show: 750, hide: 50 },
                html: true,
                container:'body',
                content: popOverContent
            });
            $(d).click(function() {
                var help = '<div class="node-help">'+($("script[data-help-name|='"+d.type+"']").html()||"")+"</div>";
                $("#tab-info").html(help);
            });
            $(d).draggable({
                helper: 'clone',
                appendTo: 'body',
                revert: true,
                revertDuration: 50
            });
        }
    }

    function removeNodeType(nt) {
        var nodeTypeId = nt.replace(" ","_");
        $("#palette_node_"+nodeTypeId).remove();
    }
    function hideNodeType(nt) {
        var nodeTypeId = nt.replace(" ","_");
        $("#palette_node_"+nodeTypeId).hide();
    }

    function showNodeType(nt) {
        var nodeTypeId = nt.replace(" ","_");
        $("#palette_node_"+nodeTypeId).show();
    }

    function filterChange() {
        var val = $("#palette-search-input").val();
        if (val === "") {
            $("#palette-search-clear").hide();
        } else {
            $("#palette-search-clear").show();
        }

        var re = new RegExp(val);
        $(".palette_node").each(function(i,el) {
            if (val === "" || re.test(el.id)) {
                $(this).show();
            } else {
                $(this).hide();
            }
        });
    }

    $("#palette-search-input").focus(function(e) {
        RED.keyboard.disable();
    });
    $("#palette-search-input").blur(function(e) {
        RED.keyboard.enable();
    });

    $("#palette-search-clear").on("click",function(e) {
        e.preventDefault();
        $("#palette-search-input").val("");
        filterChange();
        $("#palette-search-input").focus();
    });

    $("#palette-search-input").val("");
    $("#palette-search-input").on("keyup",function() {
        filterChange();
    });

    $("#palette-search-input").on("focus",function() {
        $("body").one("mousedown",function() {
            $("#palette-search-input").blur();
        });
    });

    return {
        add:addNodeType,
        remove:removeNodeType,
        hide:hideNodeType,
        show:showNodeType
    };
})();