/*\
title: $:/core/modules/macros/edit/editors/texteditor.js
type: application/javascript
module-type: editor

An editor module for editting text

\*/
(function(){

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

var MIN_TEXT_AREA_HEIGHT = 100;

function TextEditor(macroNode) {
	this.macroNode = macroNode;
}

/*
Get the tiddler being editted, field name and current value
*/
TextEditor.prototype.getEditText = function() {
	// Get the current tiddler and the field name
	var tiddler = this.macroNode.wiki.getTiddler(this.macroNode.editTiddler),
		value;
	// If we've got a tiddler, the value to display is the field string value
	if(tiddler) {
		value = tiddler.getFieldString(this.macroNode.editField);
	} else {
		// Otherwise, we need to construct a default value for the editor
		if(this.macroNode.hasParameter("default")) {
			value = this.macroNode.params["default"];
		} else {
			switch(this.macroNode.editField) {
				case "text":
					value = "Type the text for the tiddler '" + this.macroNode.editTiddler + "'";
					break;
				case "title":
					value = this.macroNode.editTiddler;
					break;
				default:
					value = "";
					break;
			}
		}
	}
	return {tiddler: tiddler, field: this.macroNode.editField, value: value};
};

TextEditor.prototype.getChild = function() {
	var edit = this.getEditText();
	var attributes = {
			"class": ["tw-edit-field"]
		},
		tagName,
		content = [];
	if(this.macroNode.classes) {
		$tw.utils.pushTop(attributes["class"],this.macroNode.classes);
	}
	// Figure out what element to use for this editor
	var type = this.macroNode.params.type;
	if(type === undefined) {
		type = edit.field === "text" ? "textarea" : "input";
	}
	switch(type) {
		case "textarea":
			tagName = "textarea";
			content.push($tw.Tree.Text(edit.value));
			break;
		case "search":
			tagName = "input";
			attributes.type = "search";
			attributes.value = edit.value;
			break;
		default: // "input"
			tagName = "input";
			attributes.type = "text";
			attributes.value = edit.value;
			break;
	}
	// Wrap the editor control in a div
	return $tw.Tree.Element(this.macroNode.isBlock ? "div" : "span",{},[$tw.Tree.Element(tagName,attributes,content,{
		events: ["focus","blur","keyup"],
		eventHandler: this
	})]);
};

TextEditor.prototype.handleEvent = function(event) {
	// Get the value of the field if it might have changed
	if("keyup focus blur".split(" ").indexOf(event.type) !== -1) {
		this.saveChanges();
	}
	// Fix the height of the textarea if required
	if("keyup focus".split(" ").indexOf(event.type) !== -1) {
		var self = this;
		window.setTimeout(function() {
			self.fixHeight();
		},5);
	}
	return true;
};

TextEditor.prototype.saveChanges = function() {
	var text = this.macroNode.child.children[0].domNode.value,
		tiddler = this.macroNode.wiki.getTiddler(this.macroNode.editTiddler);
//	if(this.macroNode.params.requireFocus === "yes" && document.activeElement !== this.macroNode.child.children[0].domNode) {
//		text = this.macroNode.params["default"] || "";
//	}
	if(!tiddler) {
		tiddler = new $tw.Tiddler({title: this.macroNode.editTiddler});
	}
	if(text !== tiddler.fields[this.macroNode.editField]) {
		var update = {};
		update[this.macroNode.editField] = text;
		this.macroNode.wiki.addTiddler(new $tw.Tiddler(tiddler,update));
	}
};

TextEditor.prototype.fixHeight = function() {
	if(this.macroNode.child && this.macroNode.child.children[0] && this.macroNode.child.children[0].type === "textarea") {
		var wrapper = this.macroNode.child.domNode,
			textarea = this.macroNode.child.children[0].domNode;
		// Set the text area height to 1px temporarily, which allows us to read the true scrollHeight
		var prevWrapperHeight = wrapper.style.height;
		wrapper.style.height = textarea.style.height + "px";
		textarea.style.overflow = "hidden";
		textarea.style.height = "1px";
		textarea.style.height = Math.max(textarea.scrollHeight,MIN_TEXT_AREA_HEIGHT) + "px";
		wrapper.style.height = prevWrapperHeight;
	}
};

TextEditor.prototype.postRenderInDom = function() {
	this.fixHeight();
};

TextEditor.prototype.refreshInDom = function() {
	if(document.activeElement !== this.macroNode.child.children[0].domNode) {
		var edit = this.getEditText();
		this.macroNode.child.children[0].domNode.value = edit.value;
	}
	// Fix the height if needed
	this.fixHeight();
};

exports["text/x-tiddlywiki"] = TextEditor;
exports["text/plain"] = TextEditor;

})();