/* If you want to use this script, simply add the following line to your monobook.js:
 
importScript('User:Anomie/lastmod.js'); // Linkback: [[User:Anomie/lastmod.js]]
 
* (Please keep the comment so I can see how many people use this).
*/

// See talk for configuration instructions

importStylesheet('User:Anomie/lastmod.css');

if(typeof(window.LastModDateFormat)=='undefined') window.LastModDateFormat="dmy";
if(typeof(window.LastModRelative)=='undefined') window.LastModRelative=false;
if(typeof(window.LastModUseUTC)=='undefined') window.LastModUseUTC=false;
if(typeof(window.LastModMonths)=='undefined') window.LastModMonths=['January','February','March','April','May','June','July','August','September','October','November','December'];

if(mw.config.get('wgNamespaceNumber')>=0) mw.loader.using('mediawiki.util', function(){
    $(document).ready(function(){
        var ins=document.getElementById('siteSub');
        if(!ins) return;

        var articleId=mw.config.get('wgArticleId');
        $.ajax({
            url:mw.util.wikiScript('api'),
            dataType:'json',
            type:'POST',
            data:{
                    format:'json',
                    action:'query',
                    pageids:articleId,
                    prop:'revisions',
                    rvprop:'timestamp'
            },
            success:function(r, sts, xhr){
                try {
                    var ts = r.query.pages[articleId].revisions[0].timestamp;
                } catch (e) {
                    return; // unexpected response e.g. TypeError: Cannot read property '0' of undefined
                }
                if(typeof(ts)=='undefined') return;
                m=r.query.pages[articleId].revisions[0].timestamp.match(/^(\d\d\d\d)-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d)Z$/);
                var dt;
                if(window.LastModRelative){
                    dt=[];
                    var n=new Date();
                    var dy=n.getUTCFullYear()-m[1];
                    var dm=n.getUTCMonth()+1-m[2];
                    var dd=n.getUTCDate()-m[3];
                    var dh=n.getUTCHours()-m[4];
                    var di=n.getUTCMinutes()-m[5];

                    if(di<0){ di+=60; dh--; }
                    if(dh<0){ dh+=60; dd--; }
                    if(dd<0){ var nn=n; nn.setUTCDate(0); dd+=nn.getDate(); dm--; }
                    if(dm<0){ dm+=12; dy--; }
                    if(dy>=0){
                        if(dy!=0) dt.push(dy+' year'+((dy==1)?'':'s'));
                        if(dm!=0) dt.push(dm+' month'+((dm==1)?'':'s'));
                        if(dd!=0) dt.push(dd+' day'+((dd==1)?'':'s'));
                        if(dy==0 && dm==0 && dd<7){
                            if(dh!=0) dt.push(dh+' hour'+((dh==1)?'':'s'));
                            if(dd<2 && di!=0) dt.push(di+' minute'+((di==1)?'':'s'));
                        }
                    }
                    if(dt.length==0) dt='less than a minute ago';
                    else dt='about '+dt.join(', ')+' ago';
                } else {
                    if(window.LastModUseUTC){
                        m[2]-=1;
                    } else {
                        dt=new Date(Date.UTC(m[1],m[2]-1,m[3],m[4],m[5],m[6]));
                        m[1]=dt.getFullYear();
                        m[2]=dt.getMonth();
                        m[3]=dt.getDate();
                        m[4]=dt.getHours().toString(); if(m[4].length==1) m[4]='0'+m[4];
                        m[5]=dt.getMinutes().toString(); if(m[5].length==1) m[5]='0'+m[5];
                        m[6]=dt.getSeconds().toString(); if(m[6].length==1) m[6]='0'+m[6];
                    }

                    if(window.LastModDateFormat=='dmy'){
                        dt=m[3]+' '+window.LastModMonths[m[2]]+' '+m[1];
                    } else if(window.LastModDateFormat=='dmy'){
                        dt=window.LastModMonths[m[2]]+' '+m[3]+', '+m[1];
                    } else {
                        m[2]++; if(m[2]<10) m[2]='0'+m[2];
                        m[3]=m[3].toString(); if(m[3].length==1) m[3]='0'+m[3];
                        dt=m[1]+'-'+m[2]+'-'+m[3];
                    } 
                    dt+=' '+m[4]+':'+m[5];
                }

                var s=document.createElement('SPAN');
                s.className='lastmodheader';
                s.appendChild(document.createTextNode('Last modified '+dt));
                ins.parentNode.insertBefore(s,ins);
            },
            error:function(xhr,textStatus,errorThrown){
                throw new Error('AJAX error: '+textStatus+' '+errorThrown);
            }
        });
    });
});