/* -*- Mode: js2; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
'use strict';

function createId(boardid, nodeid)
{
	return "b" + boardid + "_t" + nodeid;
}

function idFromStr(str)
{
	return str.substring(str.search('t') + 1, str.length);
}

function subscriptionIdFromStr(str)
{
	return str.substring(1, str.search('_'));
}

var nodes = new Array();

function findNode(id, subscribeid)
{
	for(var i = 0; i < nodes.length; i++)
	{
		var node = nodes[i];
		var child = node.findNode(id, subscribeid);
		if(child != null)
		{
			return child;
		}
	}

	return null;
}

function findNodeFromString(idstr)
{
	return findNode(idFromStr(idstr), subscriptionIdFromStr(idstr));
}

function Node(id, subscribeid)
{
	this.id = id;
	this.subscribeid = subscribeid;
	this.childNodes = new Array();
	this.attributes = {};
	this.parent = null;
}

Node.prototype.dump = function()
{
	alert(this.id);
};

Node.prototype.dumpChildren = function(msg)
{
	console.log("Node " + this.id +
	            " children (" + this.childNodes.length + "):");
	if(msg)
	{
		console.log(msg);
	}

	for(var i = 0; i < this.childNodes.length; i++)
	{
		console.log("[" + i + "]: " + this.childNodes[i].id);
	}
}

Node.prototype.findNode = function(id, subscribeid)
{
	if(this.subscribeid != subscribeid)
	{
		return null;
	}

	if(this.id == id)
	{
		return this;
	}

	for(var i = 0; i < this.childNodes.length; i++)
	{
		var node = this.childNodes[i];
		var child = node.findNode(id, subscribeid);
		if(child != null)
		{
			return child;
		}
	}

	return null;
};

Node.prototype.addChild = function(node, insertBeforeId)
{
	if(node.parent != null)
	{
		node.parent.removeChild(node);
	}

	node.parent = this;

	var inserted = false;
	for(var i = 0; i < this.childNodes.length; ++i)
	{
		if(this.childNodes[i].id == insertBeforeId)
		{
			this.childNodes.splice(i, 0, node);
			this.children_element.insertBefore(node.element,
			                                   this.children_element.childNodes[i]);
			inserted = true;
			break;
		}
	}

	if(inserted == false)
	{
		this.childNodes.push(node);
		this.children_element.appendChild(node.element);
	}

	this.updateAnnotations();
};

Node.prototype.removeChild = function(node)
{
	this.childNodes = this.childNodes.filter(function(e)
	                                         {
		                                         return e.id != node.id;
	                                         });
	node.parent = null;
	this.children_element.removeChild(node.element);

	this.updateAnnotations();
};

Node.prototype.create = function()
{
	// Node root element
	this.element = document.createElement("div");

	// Element for title, description, state, etc...
	this.data_element = document.createElement("div");
	this.data_element.className = "data";
	this.data_element.style.pointerEvents = "none";
	this.element.appendChild(this.data_element);

	// Root element for child nodes.
	this.children_element = document.createElement("div");
	this.children_element.className = "children";
	this.element.appendChild(this.children_element);

	var annotation = document.createElement("div");
	annotation.className = "annotation";

	this.id_element = document.createElement("div");
	this.id_element.className = "id";
	var id_txt = document.createTextNode(this.id);
	this.id_element.appendChild(id_txt);
	annotation.appendChild(this.id_element);

	this.children_indicator_element = document.createElement("div");
	this.children_indicator_element.className = "children_indicator";
	annotation.appendChild(this.children_indicator_element);

	this.data_element.appendChild(annotation);

	this.collapse_button = document.createElement("div");
	this.collapse_button.name = "add_button";
	this.collapse_button.setAttribute("onclick", "collapse(event)");
	this.collapse_button.setAttribute("nodeid", this.id);
	this.collapse_button.className = "button";
	this.collapse_button.innerHTML = "&#9660;";
	this.data_element.appendChild(this.collapse_button);

	var add_child_button = document.createElement("div");
	add_child_button.name = "add_button";
	add_child_button.setAttribute("onclick", "addChild(event)");
	add_child_button.setAttribute("nodeid", this.id);
	add_child_button.className = "button";
	add_child_button.classList.add('add_child');
	add_child_button.innerHTML = "&#10133;";
	this.data_element.appendChild(add_child_button);

	this.state_element = document.createElement("div");
	this.state_element.name = "state";
	this.state_element.setAttribute("onclick", "changeState(event)");
	this.state_element.setAttribute("nodeid", this.id);
	this.state_element.className = "state";
	this.setAttribute("state", "todo");
	this.data_element.appendChild(this.state_element);

	this.title_element = document.createElement("div");
	this.title_element.className = "title";
	this.title_element.setAttribute("ondblclick", "editTitle(event)");
	this.data_element.appendChild(this.title_element);

	this.description_element = document.createElement("div");
	this.description_element.className = "description";
	this.description_element.setAttribute("ondblclick", "editDescription(event)");
	this.data_element.appendChild(this.description_element);

	var node = this.element;

	node.name = "node";
	node.className = "node";
	node.setAttribute("ondrop", "drop(event)");
	node.setAttribute("ondragenter", "dragenter(event)");
	node.setAttribute("ondragover", "dragover(event)");
	node.setAttribute("ondragleave", "dragleave(event)");
	node.setAttribute("draggable", true);
	node.setAttribute("ondragstart", "drag(event)");
	node.setAttribute("ondragend", "dragEnd(event)");

	// This is a hack to make it possible to identify the nodeid and
	// oberveid from the node id alone.
	node.id = createId(this.subscribeid, this.id);

	var collapsed = localStorage.getItem(node.id+"_collapsed") == "true";
	this.setCollapsed(collapsed);
};

Node.prototype.updateAnnotations = function()
{
	var ann = "";

	if(this.childNodes.length > 0)
	{
		ann += "&#10551;";
	}

	if(this.description_element.innerHTML != "")
	{
		ann += "&#8230;";
	}

	this.children_indicator_element.innerHTML = ann;
};

Node.prototype.setCollapsed = function(collapsed)
{
	if(collapsed)
	{
		this.children_indicator_element.classList.add('collapsed');
		this.element.classList.add('collapsed');
		this.collapse_button.innerHTML = "&#9660;";
	}
	else
	{
		this.children_indicator_element.classList.remove('collapsed');
		this.element.classList.remove('collapsed');
		this.collapse_button.innerHTML = "&#9650;";
	}
};


//! Recursively set draggable property from node until root node.
Node.prototype.setDraggable = function(value)
{
	var node = this.element;
	node.draggable = value;
	if(this.parent != null)
	{
		this.parent.setDraggable(value);
	}
};

function checkHTML(html)
{
	var doc = document.createElement('p');
	doc.innerHTML = html;

	// Check for correct and balanced HTML
	if(doc.innerHTML !== html)
	{
		return false;
	}

	// Check for valid tags
	var elements = doc.getElementsByTagName("*");
	for(let element of elements)
	{
		if(element.tagName == "A")
		{
			// Accept 'href' attribute in A tag only.
			if(element.attributes.length > 1 || !element.hasAttribute("href"))
			{
				return false;
			}

			continue;
		}

		// Check for allowed tag-names
		if(element.tagName != "P" &&
		   element.tagName != "EM" &&
		   element.tagName != "STRONG" &&
		   element.tagName != "BR" &&
		   element.tagName != "UL" &&
		   element.tagName != "LI" &&
		   // Allow no attributes
		   element.attributes.length != 0)
		{
			return false;
		}
	}

	return true;
}

function makeClickthrough(e)
{
	var elements = e.getElementsByTagName("*");
	for(let element of elements)
	{
		if(element.tagName == "A")
		{
			element.style.pointerEvents = "initial"; // enable links
			continue;
		}
		element.style.pointerEvents = "none"; // enable clickthrough to parent
	}
}

Node.prototype.setAttribute = function(name, value)
{
	this.attributes[name] = value;

	if(name == "title")
	{
		if(this.title_element.firstChild != null)
		{
			this.title_element.removeChild(this.title_element.firstChild);
		}
		var title_txt = document.createTextNode(value);
		this.title_element.appendChild(title_txt);
	}

	if(name == "description")
	{
		if(this.description_element.firstChild != null)
		{
			this.description_element.removeChild(this.description_element.firstChild);
		}

		this.description_element.innerHTML = marked(value);
		makeClickthrough(this.description_element);
		this.updateAnnotations();
	}

	if(name == "dragged")
	{
		if(value == "true")
		{
			// Make transparent and non-draggable
			this.element.style.opacity = "0.3";
			// TODO: Apply recursively?
			this.element.setAttribute("draggable", false);
		}
		else
		{
			// Make opaque and draggable again
			this.element.style.opacity = "1.0";
			// TODO: Apply recursively?
			this.element.setAttribute("draggable", true);
		}
	}

	if(name == "state")
	{
		var txt = this.state_element.firstChild;
		if(txt != null)
		{
			this.state_element.removeChild(txt);
		}
		txt = document.createTextNode(value);
		this.state_element.appendChild(txt);
		if(value == "done")
		{
			this.state_element.style.backgroundColor = "#36b37e";
		}
		else if(value == "in-progress")
		{
			this.state_element.style.backgroundColor = "#ffd351";
		}
		else if(value == "blocked")
		{
			this.state_element.style.backgroundColor = "#da4343";
		}
		else
		{
			this.state_element.style.backgroundColor = "#ebedf0";
		}
	}
};

Node.prototype.getTitle = function()
{
	if(this.attributes["title"])
	{
		return this.attributes["title"];
	}
	return "";
};

Node.prototype.getDescription = function()
{
	if(this.attributes["description"])
	{
		return this.attributes["description"];
	}
	return "";
};