/*
	Question2Answer (c) Gideon Greenspan

	http://www.question2answer.org/

	
	File: qa-content/qa-question.js
	Version: See define()s at top of qa-include/qa-base.php
	Description: Javascript to handle question page actions


	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.
	
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	More about this license: http://www.question2answer.org/license.php
*/

var qa_element_revealed=null;

function qa_toggle_element(elem)
{
	var e=elem ? document.getElementById(elem) : null;
	
	if (e && e.qa_disabled)
		e=null;
	
	if (e && (qa_element_revealed==e)) {
		qa_conceal(qa_element_revealed, 'form');
		qa_element_revealed=null;

	} else {
		if (qa_element_revealed)
			qa_conceal(qa_element_revealed, 'form');
	
		if (e) {
			if (e.qa_load && !e.qa_loaded) {
				e.qa_load();
				e.qa_loaded=true;
			}
			
			if (e.qa_show)
				e.qa_show();
			
			qa_reveal(e, 'form', function() {
				var t=$(e).offset().top;
				var h=$(e).height()+16;
				var wt=$(window).scrollTop();
				var wh=$(window).height();
				
				if ( (t<wt) || (t>(wt+wh)) )
					qa_scroll_page_to(t);
				else if ((t+h)>(wt+wh))
					qa_scroll_page_to(t+h-wh);

				if (e.qa_focus)
					e.qa_focus();
			});
		}
				
		qa_element_revealed=e;
	}
	
	return !(e||!elem); // failed to find item
}

function qa_submit_answer(questionid, elem)
{
	var params=qa_form_params('a_form');
	
	params.a_questionid=questionid;
	
	qa_ajax_post('answer', params,
		function(lines) {
			
			if (lines[0]=='1') {
				if (lines[1]<1) {
					var b=document.getElementById('q_doanswer');
					if (b)
						b.style.display='none';
				}
			
				var t=document.getElementById('a_list_title');
				qa_set_inner_html(t, 'a_list_title', lines[2]);
				qa_reveal(t, 'a_list_title');
				
				var e=document.createElement('DIV');
				e.innerHTML=lines.slice(3).join("\n");
				
				var c=e.firstChild;
				c.style.display='none';

				var l=document.getElementById('a_list');
				l.insertBefore(c, l.firstChild);
				
				var a=document.getElementById('anew');
				a.qa_disabled=true;
				
				qa_reveal(c, 'answer');
				qa_conceal(a, 'form');

			} else if (lines[0]=='0') {
				document.forms['a_form'].submit();
			
			} else {
				qa_ajax_error();
			}

		}
	);
	
	qa_show_waiting_after(elem, false);
	
	return false;
}

function qa_submit_comment(questionid, parentid, elem)
{
	var params=qa_form_params('c_form_'+parentid);

	params.c_questionid=questionid;
	params.c_parentid=parentid;
	
	qa_ajax_post('comment', params,
		function (lines) {

			if (lines[0]=='1') {
				var l=document.getElementById('c'+parentid+'_list');
				l.innerHTML=lines.slice(2).join("\n");
				l.style.display='';
				
				var a=document.getElementById('c'+parentid);
				a.qa_disabled=true;
				
				var c=document.getElementById(lines[1]); // id of comment
				if (c) {
					c.style.display='none';
					qa_reveal(c, 'comment');
				}
				
				qa_conceal(a, 'form');

			} else if (lines[0]=='0') {
				document.forms['c_form_'+parentid].submit();
			
			} else {
				qa_ajax_error();
			}

		}
	);
	
	qa_show_waiting_after(elem, false);
	
	return false;
}

function qa_answer_click(answerid, questionid, target)
{
	var params={};
	
	params.answerid=answerid;
	params.questionid=questionid;
	params.code=target.form.elements.code.value;
	params[target.name]=target.value;
	
	qa_ajax_post('click_a', params,
		function (lines) {
			if (lines[0]=='1') {
				qa_set_inner_html(document.getElementById('a_list_title'), 'a_list_title', lines[1]);

				var l=document.getElementById('a'+answerid);
				var h=lines.slice(2).join("\n");
				
				if (h.length)
					qa_set_outer_html(l, 'answer', h);
				else
					qa_conceal(l, 'answer');
			
			} else {
				target.form.elements.qa_click.value=target.name;
				target.form.submit();
			}
		}
	);
	
	qa_show_waiting_after(target, false);
	
	return false;
}

function qa_comment_click(commentid, questionid, parentid, target)
{
	var params={};
	
	params.commentid=commentid;
	params.questionid=questionid;
	params.parentid=parentid;
	params.code=target.form.elements.code.value;
	params[target.name]=target.value;
	
	qa_ajax_post('click_c', params,
		function (lines) {
			if (lines[0]=='1') {
				var l=document.getElementById('c'+commentid);
				var h=lines.slice(1).join("\n");
				
				if (h.length)
					qa_set_outer_html(l, 'comment', h)
				else
					qa_conceal(l, 'comment');
			
			} else {
				target.form.elements.qa_click.value=target.name;
				target.form.submit();
			}
		}
	);
	
	qa_show_waiting_after(target, false);
	
	return false;
}

function qa_show_comments(questionid, parentid, elem)
{
	var params={};
	
	params.c_questionid=questionid;
	params.c_parentid=parentid;
	
	qa_ajax_post('show_cs', params,
		function (lines) {
			if (lines[0]=='1') {
				var l=document.getElementById('c'+parentid+'_list');
				l.innerHTML=lines.slice(1).join("\n");
				l.style.display='none';
				qa_reveal(l, 'comments');
			
			} else {
				qa_ajax_error();
			}
		}
	);
	
	qa_show_waiting_after(elem, true);
	
	return false;
}

function qa_form_params(formname)
{
	var es=document.forms[formname].elements;
	var params={};
	
	for (var i=0; i<es.length; i++) {
		var e=es[i];
		var t=(e.type || '').toLowerCase();
		
		if ( ((t!='checkbox') && (t!='radio')) || e.checked)
			params[e.name]=e.value;
	}
	
	return params;
}

function qa_scroll_page_to(scroll)
{
	$('html,body').animate({scrollTop: scroll}, 400);
}