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

var tasks = new Array();

function findTask(id, observeid)
{
    for(var i = 0; i < tasks.length; i++) {
	var task = tasks[i];
	var child = task.findTask(id, observeid);
	if(child != null) return child;
    }

    return null;
}

function Task(id, observeid)
{
    this.id = id;
    this.observeid = observeid;
    this.children = new Array();
    this.attributes = {};
    this.parent = null;

    // Elements:
    this.element = document.createElement("div");
    this.div_id = document.createElement("span");
    this.div_title = document.createElement("span");
}

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

Task.prototype.findTask = function(id, observeid)
{
    if(this.observeid != observeid) return null;

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

    for(var i = 0; i < this.children.length; i++) {
	var task = this.children[i];
	var child = task.findTask(id, observeid);
	if(child != null) return child;
    }

    return null;
}
    
Task.prototype.addChild = function(task)
{
    if(task.parent != null) task.parent.removeChild(task);
    this.children.push(task);
    task.parent = this;
    this.element.appendChild(task.element);
}

Task.prototype.removeChild = function(task)
{
    this.children = this.children.filter(
	function(e) {
	    return e.id != task.id;
	});
    task.parent = null;
    this.element.removeChild(task.element);
}

Task.prototype.create = function()
{
    var task = this.element;

    task.name = "task";
    task.setAttribute("class", "task");
    task.setAttribute("ondblclick", "editTitle(this, event)");
    //task.setAttribute("onclick", "showHideChildren(this, event)");
    task.setAttribute("ondrop", "drop(this, event)");
    task.setAttribute("ondragover", "return false");
    task.setAttribute("draggable", true);
    task.setAttribute("ondragstart", "drag(this, event)");
    task.setAttribute("title", this.id);
    
    task.id = createId(this.observeid, this.id);
/*    
    var observe_button = document.createElement("div");
    observe_button.name = "observe_button";
    observe_button.setAttribute("onclick", "observeMe(this, event)");
    observe_button.setAttribute("title", this.id);
    observe_button.setAttribute("style", "float: left; display: inline-box; width:14px; height: 14px; border: solid green 2px; cursor: pointer;");
    var txt_plus = document.createTextNode("+");
    observe_button.appendChild(txt_plus);
    task.appendChild(observe_button);
    
    var unobserve_button = document.createElement("div");
    unobserve_button.name = "unobserve_button";
    unobserve_button.setAttribute("onclick", "unobserveMe(this, event)");
    unobserve_button.setAttribute("title", this.id);
    unobserve_button.setAttribute("style", "float: left; display: inline-box; width:14px; height: 14px; border: solid red 2px; cursor: pointer;");
    var txt_minus = document.createTextNode("-");
    unobserve_button.appendChild(txt_minus);
    task.appendChild(unobserve_button);
*/
    this.element.appendChild(this.div_id);
    var id_txt = document.createTextNode(this.id);
    this.div_id.appendChild(id_txt);

    this.element.appendChild(this.div_title);

    this.setAttribute("title", "(missing title)");
}

Task.prototype.setAttribute = function(name, value)
{
    this.attributes[name] = value;
    
    if(name == "title") {
	if(this.div_title.firstChild != null) {
	    this.div_title.removeChild(this.div_title.firstChild);
	}
	var title_txt = document.createTextNode(value);
	this.div_title.appendChild(title_txt);
    }
}