/*\
title: $:/core/modules/widgets/button.js
type: application/javascript
module-type: widget

Button widget

\*/
(function(){

/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";

var Widget = require("$:/core/modules/widgets/widget.js").widget;

var ButtonWidget = function(parseTreeNode,options) {
    this.initialise(parseTreeNode,options);
};

/*
Inherit from the base widget class
*/
ButtonWidget.prototype = new Widget();

/*
Render this widget into the DOM
*/
ButtonWidget.prototype.render = function(parent,nextSibling) {
    var self = this;
    // Remember parent
    this.parentDomNode = parent;
    // Compute attributes and execute state
    this.computeAttributes();
    this.execute();
    // Create element
    var tag = "button";
    if(this.buttonTag && $tw.config.htmlUnsafeElements.indexOf(this.buttonTag) === -1) {
        tag = this.buttonTag;
    }
    var domNode = this.document.createElement(tag);
    // Assign classes
    var classes = this["class"].split(" ") || [],
        isPoppedUp = this.popup && this.isPoppedUp();
    if(this.selectedClass) {
        if(this.set && this.setTo && this.isSelected()) {
            $tw.utils.pushTop(classes,this.selectedClass.split(" "));
        }
        if(isPoppedUp) {
            $tw.utils.pushTop(classes,this.selectedClass.split(" "));
        }
    }
    if(isPoppedUp) {
        $tw.utils.pushTop(classes,"tc-popup-handle");
    }
    domNode.className = classes.join(" ");
    // Assign other attributes
    if(this.style) {
        domNode.setAttribute("style",this.style);
    }
    if(this.tooltip) {
        domNode.setAttribute("title",this.tooltip);
    }
    if(this["aria-label"]) {
        domNode.setAttribute("aria-label",this["aria-label"]);
    }
        if(this["accesskey"]) {
                domNode.setAttribute("accesskey",this["accesskey"]);
        }

    // Add a click event handler
    domNode.addEventListener("click",function (event) {
        var handled = false;
        if(self.invokeActions(this,event)) {
            handled = true;
        }
        if(self.to) {
            self.navigateTo(event);
            handled = true;
        }
        if(self.message) {
            self.dispatchMessage(event);
            handled = true;
        }
        if(self.popup) {
            self.triggerPopup(event);
            handled = true;
        }
        if(self.set) {
            self.setTiddler();
            handled = true;
        }
        if(self.actions) {
            self.invokeActionString(self.actions,self,event);
        }
        if(handled) {
            event.preventDefault();
            event.stopPropagation();
        }
        return handled;
    },false);
    // Make it draggable if required
    if(this.dragTiddler || this.dragFilter) {
        $tw.utils.makeDraggable({
            domNode: domNode,
            dragTiddlerFn: function() {return self.dragTiddler;},
            dragFilterFn: function() {return self.dragFilter;},
            widget: this
        });
    }
    // Insert element
    parent.insertBefore(domNode,nextSibling);
    this.renderChildren(domNode,null);
    this.domNodes.push(domNode);
};

/*
We don't allow actions to propagate because we trigger actions ourselves
*/
ButtonWidget.prototype.allowActionPropagation = function() {
    return false;
};

ButtonWidget.prototype.getBoundingClientRect = function() {
    return this.domNodes[0].getBoundingClientRect();
};

ButtonWidget.prototype.isSelected = function() {
    return this.wiki.getTextReference(this.set,this.defaultSetValue,this.getVariable("currentTiddler")) === this.setTo;
};

ButtonWidget.prototype.isPoppedUp = function() {
    var tiddler = this.wiki.getTiddler(this.popup);
    var result = tiddler && tiddler.fields.text ? $tw.popup.readPopupState(tiddler.fields.text) : false;
    return result;
};

ButtonWidget.prototype.navigateTo = function(event) {
    var bounds = this.getBoundingClientRect();
    this.dispatchEvent({
        type: "tm-navigate",
        navigateTo: this.to,
        navigateFromTitle: this.getVariable("storyTiddler"),
        navigateFromNode: this,
        navigateFromClientRect: { top: bounds.top, left: bounds.left, width: bounds.width, right: bounds.right, bottom: bounds.bottom, height: bounds.height
        },
        navigateSuppressNavigation: event.metaKey || event.ctrlKey || (event.button === 1),
        event: event
    });
};

ButtonWidget.prototype.dispatchMessage = function(event) {
    this.dispatchEvent({type: this.message, param: this.param, tiddlerTitle: this.getVariable("currentTiddler"), event: event});
};

ButtonWidget.prototype.triggerPopup = function(event) {
    $tw.popup.triggerPopup({
        domNode: this.domNodes[0],
        title: this.popup,
        wiki: this.wiki
    });
};

ButtonWidget.prototype.setTiddler = function() {
    this.wiki.setTextReference(this.set,this.setTo,this.getVariable("currentTiddler"));
};

/*
Compute the internal state of the widget
*/
ButtonWidget.prototype.execute = function() {
    // Get attributes
    this.actions = this.getAttribute("actions");
    this.to = this.getAttribute("to");
    this.message = this.getAttribute("message");
    this.param = this.getAttribute("param");
    this.set = this.getAttribute("set");
    this.setTo = this.getAttribute("setTo");
    this.popup = this.getAttribute("popup");
    this.hover = this.getAttribute("hover");
    this["class"] = this.getAttribute("class","");
    this["aria-label"] = this.getAttribute("aria-label");
    this["accesskey"] = this.getAttribute("accesskey");
    this.tooltip = this.getAttribute("tooltip");
    this.style = this.getAttribute("style");
    this.selectedClass = this.getAttribute("selectedClass");
    this.defaultSetValue = this.getAttribute("default","");
    this.buttonTag = this.getAttribute("tag");
    this.dragTiddler = this.getAttribute("dragTiddler");
    this.dragFilter = this.getAttribute("dragFilter");
    // Make child widgets
    this.makeChildWidgets();
};

/*
Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
*/
ButtonWidget.prototype.refresh = function(changedTiddlers) {
    var changedAttributes = this.computeAttributes();
    if(changedAttributes.to || changedAttributes.message || changedAttributes.param || changedAttributes.set || changedAttributes.setTo || changedAttributes.popup || changedAttributes.hover || changedAttributes["class"] || changedAttributes.selectedClass || changedAttributes.style || changedAttributes.dragFilter || changedAttributes.dragTiddler || (this.set && changedTiddlers[this.set]) || (this.popup && changedTiddlers[this.popup])) {
        this.refreshSelf();
        return true;
    }
    return this.refreshChildren(changedTiddlers);
};

exports.button = ButtonWidget;

})();